HomeMy WebLinkAboutPacket, Stormwater Management Program Plan
TOWN COUNCIL
MEETING
INFORMATION
TOWN OF MARANA
MEETING DATE:
March 7, 2006
AGENDA ITEM:
1.5
TO:
MAYOR AND COUNCIL
FROM:
H, Thomas Gill, Jr., Director of Public Works
SUBJECT:
Resolution No. 2006-37: Relating to Stormwater; approving and
authorizing the Town of Marana Storm Water Management
Program (Plan).
DISCUSSION
Town of Marana is a regulated small Municipal Separate Storm Sewer System (MS4), requiring the Town
to be covered by a water quality permit under the Arizona Pollutant Discharge Elimination System
(AZPDES) stormwater program, The Arizona Department of Environmental Quality (ADEQ) administers
the AZPDES program.
The Town is responsible for managing stormwater and urban runoff to minimize or prevent the pollutants
found in storm water from entering the Nation's waters, The Town was required to file the SWMP and a
Notice of Intent to the Arizona Department of Environmental Quality (ADEQ) by the March 10, 2003
deadline,
The permit requires the Town to develop a stormwater management program and write a Storm Water
Management Pan (SWMP) to set the goals of the program, The Town's SWMP explains how the Town
meets, or will meet, the requirements set by the Stormwater Program,
This plan includes information on how the Town of Marana will educate the public, seek public
participation, address construction site runoff, and how the Town will ensure that its daily operations will
address the issue of stormwater pollution,
A TT ACHMENTS
White Paper
Town of Marana Stormwater Program Questions and Answers
RECOMMENDATION
Staff recommends adoption of the Town of Marana Storm Water Management Program (Plan),
SUGGESTED MOTION
I move to adopt Resolution No, 2006-37,
{00001823.DOC /}BriefTitle
2/24/20041:33 PM FJC
MARANA RESOLUTION NO. 2006-37
RELATING TO STORMWATER; APPROVING AND AUTHORIZING THE TOWN OF
MARANA STORM WATER MANAGEMENT PROGRAM (PLAN).
WHEREAS, the Town of Marana is a regulated Phase II Small Municipal Separate Storm
Sewer System (MS4); and
WHEREAS, the Town of Marana is mandated by the Arizona Department Of
Environmental Quality (ADEQ) to comply with Arizona Pollutant Discharge Elimination System
(AZPDES) Program requirements; and
WHEREAS, the Town of Marana submitted a Notice of Intent (NOI) to Discharge and a
Storm Water Management Program (Plan) (SWMP) in March of 2003 to the Arizona Department
of Environmental Quality (ADEQ) as a requirement of the AZPDES Phase II implementation;
and
WHEREAS, the Town of Marana received an NOI authorization letter from ADEQ, and
the Town is operating under an MS4 stormwater permit; and
WHEREAS, the Mayor and Council of the Town of Marana find that it is in the best
interests of the public to reduce stormwater pollution.
NOW, THEREFORE, BE IT RESOLVED BY THE MAYOR AND COUNCIL OF THE
TOWN OF MARANA, ARIZONA, that the Storm Water Management Program (Plan) for the
Town of Marana, attached as Exhibit A, is hereby approved, and the Mayor is hereby authorized
and directed to execute it for and on behalf of the Town of Marana.
IT IS FURTHER RESOLVED that the Town's Manager and staff are hereby directed and
authorized to undertake all other and further tasks required or beneficial to carry out the terms,
obligations, and objectives of SWMP.
PASSED AND ADOPTED BY THE MAYOR AND COUNCIL OF THE TOWN OF
MARANA, ARIZONA, this 7th day of March, 2006.
Mayor Ed Honea
ATTEST:
APPROVED AS TO FORM:
Jocelyn C. Bronson, Town Clerk
Frank Cassidy, Town Attorney
White Paper: Town of Marana Storm Water Management Plan
Lisa M Duncan, Environmental Planner
February 23, 2006
Background:
In 1999, the U.S. Environmental Protection Agency (US EP A) published rules for the Phase II
implementation of the National Pollutant Discharge Elimination System (NPDES) Stormwater
Permit Program, created by the Clean Water Act amendments of 1987. In 2002, the State of Arizona,
through the Arizona Department of Environmental Quality (ADEQ) took primacy over water quality
programs, and created the Arizona Pollutant Discharge Elimination System (AZPDES). The
AZPDES permit program is modeled after the federal program, with one important exception. While
the US EPA identified six minimum control measures (MCMs) that should be guidelines for
municipalities to develop Best Management Practices (BMPs), ADEQ made these guidelines into
regulations for their Phase II stormwater permits.
The six MCMs are:
I. Public Education and Outreach
2. Public Involvement and Participation
3. Construction stormwater pollution prevention
4. Post-construction pollution prevention
5. Illicit Discharge Detection and Elimination (IDDE)
6. Municipal Operation good housekeeping
The Town of Marana is a designated small, regulated MS4 under this Phase II stormwater program.
The Phase II regulations required the Town to develop and submit a Storm Water Management Plan
(SWMP), incorporating the above MCMs, to ADEQ with a Notice of Intent (NO I) to discharge
permit application by March 10,2003. The Town of Marana submitted documents to ADEQ on that
date.
Current Status:
ADEQ reviewed the initial draft of the Town's SWMP and returned comments to the Town on
September 19, 2005. Staff addressed ADEQ's comments and returned the SWMP prior to the
October 30, 2005 deadline given. ADEQ subsequently approved the Town's SWMP for compliance
with the MS4 permit. The Town is currently operating under the Phase II permit and phasing into
full implementation of the outlined measures in the SWMP. MS4s are allowed to "phase" into full
compliance, gradually implementing each of the six MCMs until the MS4 reaches full compliance
within 5 years, or until March 2007. Revisions to the SWMP may be required by ADEQ periodically
as the Town's compliance area grows, or after review of the required annual reports. The urbanized
areas will be re-evaluated in 2010, after the next decennial census. The Town's compliance area is
expected to expand as a result.
2004-2005 activities
Town staff actively work on implementing the BMPs identified in the Town's SWMP. Town staff
marked all storm drains with the stormwater logo "Only Rain in the Drain". The Town applied for
and received a grant offered by ADEQ during fiscal year 2004-2005. The grant financed the
following projects:
I. Purchased storm drain markers to mark the storm drains,
2. Enabled staff to conduct outreach and education to over 700 schoolchildren and 200 adults
over the fiscal year through presentations, and brochure and promotional item distribution,
3. Financed personnel time to work with GIS staff to populate the Storm View module of
Carte graph with information that will facilitate inventorying of the Town's storm water
system, aid the entry of inspection data, and initiate work order requests,
4. Funded work with the IT department to update the Environmental division's storm water web
pages,
5. Provided funding for training,
6. To purchase a printer/copier for the brochure and flyers,
7. To purchase a brochure stand and cabinet, and
8. Funded the storm water artwork contest hosted by the Town's Environmental Division.
These accomplishments allowed the Town to achieve compliance toward the next phase of
implementation into full compliance with the Town's MS4 stormwater permit.
2005-2006... So far:
Staff utilized the artwork generated from the contest to develop, print, and distribute 1100 copies of
a stormwater calendar to Town residents and employees during the 2005-2006 fiscal year. This
project accomplished public outreach and education, as well as public participation and involvement
goals, reaching an estimated 3500 individuals. The calendar is posted on the Town's website as well.
Staffis preparing to kick off the 2006-2007 artwork contest in March. As a result of the widespread
calendar distribution outreach and feedback received at the Holiday Tree Lighting Ceremony, the
Environmental Division expects that participation will be greater than last year's contest.
The Environmental Division is working with Marana High School Art classes to create artwork for a
Town of Maran a Stormwater coloring book, to be distributed to children of younger ages,
approximately 4 to 8.
Environmental Engineering Division staff developed and distributed targeted brochures to the
construction and automotive industries, and work is in process for additional target brochures for
other categories of industry, including the restaurant industry.
Environmental Division staff continues to meet regularly with Subdivision Engineering, and
periodically with the Construction Management divisions, to flesh out the Town's needs for specific
rules for construction projects to follow with Storm Water pollution prevention plan submittals,
inspection procedures, and NOI application forms, and to determine what needs to be included in the
stormwater ordinance under development, that is not covered under other existing regulation.
Staff is working with the GIS department to determine storm sewer system mapping needs,
projecting out over the next five years when the US Environmental Protection Agency reassesses
and designates urbanized areas after the decennial census in 2010. The most cost efficient way to
maintain compliance with the requirements is to be proactive in getting the necessary data about the
Town's storm sewer system into the Town's storm sewer system map with accompanying attribute
data. The Environmental Division will use funds in the current fiscal year budget to begin the
digitization of As Built plans into the GIS system toward accomplishing this goal.
Environmental Division staff are also working with stakeholders to develop the Town of Marana's
stormwater requirements for Stormwater inspections, correction of BMPs, performing outreach on
the SWPPP review process, and distributing draft guidelines to stakeholders. Further coordination
with stakeholders will take place prior to bringing an ordinance to Town Council between the end of
2006 and mid-2007.
TOWN OF MARANA'S STORMW A TER MANAGEMENT PROGRAM
QUESTIONS AND ANSWERS
Compiled by: Lisa M, Duncan, Environmental Planner
Environmental Division, Town of Maran a
Department of Public Works
TOWN OF MARANA'S STORMWATER MANAGEMENT PROGRAM---
QUESTIONS AND ANSWERS
I. Question: Why is the Town's stormwater management program necessary?
Answer: There are several reasons:
1. It was mandated by the Environmental Protection Agency in
1999, through the National Pollutant Discharge Elimination
System (NPDES). After that, the State of Arizona took primacy
over most water quality programs under the Clean Water Act.
The State mandated the program through the creation of the
Arizona Pollutant Discharge Elimination System (AZPDES),
with the Arizona Department of Environmental Quality
administering the program.
The Town of Marana is a designated Phase II stormwater entity.
Phase I entities are large entities, and were the first to be
regulated. Phase II entities like the Town of Marana and Oro
Valley, are smaller, have fewer urbanized areas, and are being
"phased in" to the program over a five-year period that began in
March of2003.
11. It is good common sense. National studies have shown that
storm water pollution from urbanized areas affect the flow rate
and volume of runoff, besides increasing the number and type of
pollutants carried in the flow.
Marana's waterways include man-made or natural ditches,
channels, canals, and washes, and our stormwater flows
eventually into the Santa Cruz River.
. Stormwater runoff, also called "urban runoff', carries
asphalt and petroleum products or other chemicals
including metals such as zinc, from rooftops to the ground.
The runoff picks up metals, petroleum products, herbicides,
pesticides, and other household or vehicle metals and
chemicals, including lead, cadmium, and zinc, loose soil
particles from bare soil, fertilizers, pet wastes, trash, and
other debris, flowing over land to end up in our washes and
the Santa Cruz River.
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. Some of the chemicals will infiltrate to our ground water,
contaminating our water supply. Bacteria or other
pathogens can sit in ponded water pools for days, creating
health hazards.
. Soil sediment and trash or other debris can clog drainage
channels and washes, increasing flooding, and decreasing
infiltration.
. Silt and sediment clogs ground-water recharge areas in
alluvial channels, impairing the sustainability of riparian
habitats, and reducing the carrying potential and storage
capacity of drainage and floodwater control structures.
. Bacteria and other pathogens can create health hazards.
. Household chemical wastes such as pesticides, paint,
solvents, used motor oil, and other automotive fluids can
contribute chemicals that are toxic to land animals and
aquatic life as well as degrading to ground water quality.
. A surplus of nutrients can be harmful in aquatic habitats,
and are a cause of algal blooms. As the algae die off, the
decomposition process can have a considerable influence
on dissolved oxygen levels in a water body. High
concentrations of nitrates in ground water used for drinking
water also cause adverse health affects to humans and pets.
. Polluted stormwater most noticeably affects surface waters
used as drinking water sources, and are a human health
concern. This results in increased drinking water treatment
costs.
. Debris of all types: plastic, rubber, metal, and construction
materials can harm animals and birds, become lodged at
culverts and bridges, impeding flow and increasing water-
surface elevations, increasing the risk of flooding.
2. Question: What is the regulatory background for the AZPDES stormwater
program?
Answer: The Federal Water Pollution Control Act (FWPCA) Public Law
80-845 was enacted in 1948 when awareness of water pollution in
this country caused make rules that would help ensure clean
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drinking water supplies, biologically healthy aquatic habitats, and
safe recreation areas for our Nation's citizens and wildlife. The
FWPCA has been amended nine times between 1956 and 1987.
. Most notably, the 1972 Amendments resulted in P.L. 92-
500, commonly known as the Clean Water Act (CW A). The
CW A amendments, established water quality standards, and
permit programs to regulate point source pollutant
discharge, including industrial dischargers. These
amendments also provided a construction grants program to
help communities improve wastewater treatment plant
capabilities.
. Created through the 1972 amendments, the purpose of the
National Pollutant Discharge Elimination System (NPDES)
was to regulate discharges to waters of the United States,
and gave the United States Environmental Protection
Agency (US EP A) responsibility to administer the NPDES
program.
By the late 1980s, scientific studies showed that to the
maximum extent possible, improvements to water quality
from decreasing water pollution from all other major
sources had been achieved. The major source remaining for
water pollution was non-point source pollution from urban
and stormwater runoff.
. In 1990, the EP A publicized rules establishing Phase I of the
NPDES Stormwater Program. Implementation of Phase I
began regulation of discharges from large Municipal
Separate Storm Sewer Systems (MS4s), those urbanized
entities such as the City of Phoenix, and Pima County, with
populations of 100,000 people or more.
The objective of the Phase I program was to implement a
stormwater management program to control contaminant
input to stormwater runoff in communities served by
Municipal Separate Storm Sewer Systems (MS4s) and
having populations of 100,000 or greater.
· In December 1999, the Stormwater Phase II final rule was
published in the Federal Register vol. 64, no. 235. This rule
expanded the existing Phase I regulations, with some
variation in approach, to communities of less than 100,000
population that are located in "urbanized areas" as defined
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by the Bureau of Census. The Phase II program expanded
the Phase I program to include those entities having
urbanized areas containing less than 100,000 people, with a
density of 10,000 people or more per square mile.
. Thus, the Town of Marana, due to its proximity to the
Tucson metropolitan area, is required to implement
activities that will reduce the discharge of pollutants in
stormwater to the "maximum extent practicable" (MEP)
thereby aiding in the protection of water quality.
3. Question: What is required of the Town of Marana and other small MS4s?
Answer: The Town of Marana was required to submit a Stormwater
Management Plan (SWMP) to the Arizona Department of
Environmental Quality (ADEQ) by March 10, 2003.
. Town staff members who developed the initial draft of the
SWMP and filed the original NOI for the Town met this
requirement.
. The NPDES Phase II activity requires that small MS4s
develop and implement best management practices (BMPs)
and timelines for achievement of measurable goals to
satisfy each of the following six minimum control
measures:
a. Public education and outreach,
b. Public participation/involvement,
c. Illicit discharge detection and elimination (IDDE),
d. Construction site runoff control,
e. Post-construction runoff control, and
f. Pollution prevention and good housekeeping
. Throughout the permit period, March 2003 through
December 2007, the permittee must evaluate the
effectiveness of their chosen BMPs to determine whether
the Town is meeting the desired goals/objectives of the
program.
· All communities are required to submit an annual report to
the ADEQ. Staff has filed two annual reports so far, in
September 2004 and September 2005.
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4. Question: Who pays the bill?
Answer: Since the inception of the NPDES Phase I stormwater program in 1990,
it has been a community's responsibility to fund the program. The
requirement for community funding has been carried over to the
NPDES Phase II stormwater program. Failure of an identified Phase II
community to file the required SWMP or to ignore the implementation
of activities contained in the Plan would place the community in a non-
compliant position. Being in this status could lead to the issuance of
fines by the ADEQ.
The Town of Oro Valley realized early the need to participate in the
NPDES Phase II program and formed a Stormwater Utility
Commission in October 200 I. Oro Valley has a tradition of forming
and utilizing volunteer groups in various ways to help accomplish
required programs. This tradition results in a win-win situation as it
gives residents an opportunity to be involved in Town activities and
utilize their knowledge and skills, and it allows the Town to accomplish
various programs at a minimum cost. As an example, through the
volunteer efforts of the SWUC members, the Town was able to write
and submit the SWMP to ADEQ, generate a staffing and budget
estimate for the SWMP, and develop a proposed fee structure that will
recoup future stormwater program costs. The work of volunteers on the
SWUC resulted in an estimated savings of $50,000-$100,000 to the
Town ofOro Valley.
The Town of Marana must decide how it wants to fund the stormwater
program in the future: develop a stormwater utility such as Oro Valley,
through the General Fund, or by another means. Staff will prepare an
alternatives analysis for this purpose and present it to Council at a later
date.
Coordination of efforts in the identification and correction of drainage
issues with stormwater quantity and quality concerns in Marana should
make it possible to maximize benefits and minimize costs through
alternate funding available for drainage and floodplain issues.
5. Question: What can our residents do to help improve stormwater quality?
Answer: As a part of the Outreach and Education Minimum Control measure, the
Town is trying to raise awareness in its residents so that, on a daily
basis, thinking about how their actions, whether it be at home or at
work, impact the environment and stormwater quality, become second
nature. It has been shown that urbanization increases the variety and
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amount of contaminants carried into streams and washes. The
contaminants include:
a. Sediment,
b. Oil, grease, and toxic fluids from motor vehicles,
c. Pesticides and fertilizers from lawns and gardens,
d. Viruses, bacteria, and nutrients from pet wastes and failing
septic systems,
e. Trace metals and toxic organic compounds from roof shingles,
motor vehicles, and improper handling and disposal of paints
and household cleaning compounds, and
f. Toxicological and physical affects of debris and waste material
generated both residentially and commercially.
Residents can help to lessen the likelihood of contaminants entering
stormwater runoff simply by thinking about and conducting your day-to-
day activities in an environmentally friendly manner. Here are a few
suggestions for home and business:
1. Home:
a. Use pesticides and fertilizers sparingly and only in
recommended amounts. Use organic mulch or
biologically safer pest control methods whenever
possible.
b. Do not over water lawns. Consider the use of a soaker
hose instead of a sprinkler.
c. Compost or mulch yard wastes. Do not leave it in the
street, sweep it into a storm drain, or dump it in a wash
or stream.
d. Cover piles of dirt or mulch being used in landscaping
projects.
e. Do car washing and engine degreasing at a commercial
car wash that treats or recycles its wastewater.
f. Repair automobile fluid leaks before they become a
major problem.
g. Dispose of used automotive fluids, batteries, and tires
as well as paints and cleaning solvents at designated
drop-off or recycling centers.
h. Pick up pet wastes and dispose of properly. Flushing
pet waste is the best disposal method.
1. Inspect your septic system every 3-4 years and pump as
necessary. Do not dispose of household chemicals or
toxic wastes in sinks or toilets that drain to a septic
system.
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J. Use environmentally friendly landscaping techniques.
For example, permeable pavement will allow rain to
soak through thereby decreasing runoff; rain barrels can
be used to collect rooftop runoff for use on gardens and
shrubs; and landscaped swales and rain gardens can be
designed to make use of runoff generated on a
residential lot.
2. Business/commercial property:
a. Sweep up litter and debris from sidewalks, driveways,
and parking lots to prevent their wash off during storm
events.
b. Cover grease storage containers and dumpsters; and
keep them clean to avoid leaks.
c. Report any chemical spill to the local hazardous waste
cleanup team.
d. Divert stormwater away from any disturbed or exposed
areas on a construction site.
e. Install silt fences, vehicle tire wash/mud removal areas,
containment barriers around fluid storage areas, and
vegetative cover to minimize the potential for sediment
and contaminant movement from construction areas.
f. Clean gasoline and other automotive fluid spills
immediately and properly dispose of cleanup materials.
Facilities should be designed for spill containment and
have operational oil/water separators.
In addition to adapting an environmentally friendly approach to daily
activities, residents can become involved in one of the Town of Marana
programs with goals of keeping our community a clean and aesthetically
desirable place to live. These programs include the ongoing Adopt-
A-Roadway program and new efforts-the Adopt-A-Neighborhood and
Adopt-A-Wash programs.
6. Question: How do I get involved?
Answer: The Town of Marana has identified coordinators for the
roadways, neighborhood, and washes programs. The contacts are as
follows:
(a) Adopt-A-Roadway and Adopt-a-Neighborhood: Contact
Peggy Smothers at the Marana Water Department: (520)
382-2506; and
(b) Adopt-A-Wash: Contact Corby Lust at the Public Works
Department: (520) 382-2600.
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As mentioned previously, all three programs have a common goal to keep
Marana's landscape clean and litter free and to help provide an
aesthetically desirable place to live. It is important to remember that any
trash or other unwanted material that is disposed of improperly along
roads and trails can ultimately end up in a wash or stream and exasperate
the potential problems caused by trash that is discarded in washes directly.
Once in a wash, the trash when in contact with water can become a
contaminant source that can affect stormwater quality and possibly even
our groundwater resources. The trash, litter, and petroleum-based products
will accumulate at culvert openings and under bridges, affecting the
structures' ability to convey floodwaters.
Additionally, involvement in any of these activities creates a win-win
situation. It helps the Town to reach the stormwater program goals at a
minimum cost, while providing the participants with a healthy activity,
fresh air and sunshine, as well as an opportunity to meet others in their
community and perhaps make some new friends.
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MEMORANDUM
TOWN OF MARANA
DEPARTMENT OF PUBLIC WORKS
TO: Ed Honea, Mayor, Town of Marana
Herb Kai, Vice Mayor
Bob Allen, Council Member
Jim Blake, Council Member
Patti Comerford, Council Member
Tim Escobedo, Council Member
Carol McGorray, Council Member
-1
/(;1/:7
FROM: li...VfI. Thomas Gill, Jr., Director, Public Works Department
DATE:
March 1, 2006
RE:
T own of Marana Storm Water Management Plan
Attached to this memo is the final draft of the Town's Storm Water Management Program
(Plan), or SWMP, This document will be presented for adoption and authorization at the March
7,2006 Town Council meeting,
In your agenda packets, you will receive a white paper on this plan and a set of questions and
answers, Staff will give a short Power Point presentation on the March 7, 2006 meeting that
highlights the main points of the Town's Storm Water Management Plan.
By the end of 2007, the Town must also pass a stormwater ordinance that is enforceable as a part
of the Town's MS4 permit requirements. That ordinance is currently in its first draft, and will be
presented to Council at a later time when it is finalized,
"The Marana Public Works Department is committed to providing quality service by consistently delivering and
maintaining reliable, safe public facilities with a productive, respectful and ethical work force"
Revised 11/3/03
H:SHARED FILES-2/Forms/Memo Master
Town of Marana Storm Water Management Program is on file and available for viewing
from 8:00 a.m. to 5:00 p.m. Monday through Friday excluding holidays, at the office of
the Town Clerk, 11555 W. Civic Center Drive, Marana, AZ 85653.
Town of Marana
Storm Water Manaqement Pro~ram
To Fulfill the Requirements of the
Arizona Pollution Discharge Elimination System
General Permit for Discharge (AZG2002-002) from
Small Municipal Separate Storm Sewer Systems (MS4s)
To Waters of the United States
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SWMP Revision History
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March 2003, Initial Draft
Leslie Liberti, Intern, Town of Marana
Jennifer Ward, Environmental Engineering Technician, Town of Maran a
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First Revision: October 26, 2005
Lisa M. Duncan, Environmental Planner, Town of Marana
Jennifer Christe1rnan (formerly J. Ward), Manager, Environmental Engineering
Division, Town of Marana
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d. All impoundments of waters defined as waters of the United States
under this definition;
e. Tributaries of waters identified in subsections (a) through (d);
f. The territorial sea; and
g. Wetlands adjacent to waters (other than waters that are themselves
wetlands) identified in subsections (a) through (f) (ADEQ, 2004)
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List of Abbreviations
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AAC Arizona Administrative Code
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ADEQ Arizona Department of Environmental Quality
ADOT Arizona Department of Transportation
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ARS Arizona Revised Statutes
AZPDES Arizona Pollutant Discharge Elimination System
BMP Best Management Practice
CFR Code of Federal Regulations
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CWA Clean Water Act
EPA Environmental Protection Agency, U.S.
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FR Federal Register
MMC Marana Municipal Complex -
MOC Marana Operations Center
MS4 Municipal Separate Storm Sewer System -
NPDES National Pollutant Discharge Elimination System
PAG Pima Association of Governments -
PCDOT Pima County Department of Transportation
PCFCD Pima County Flood Control District -
SWMP Storm Water Management Program
SWPPP Storm Water Pollution Prevention Plan -
SVVP3 Storm Water Pollution Prevention Plan
UA Urbanized Area .-w.
VA Veteran's Administration
Water C.A.S.A. Water Conservation Alliance of Southern Arizona ~'
WET Water Education for Teachers
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TABLE OF CONTENTS
Definitions III
List of Abbreviations VI
1. INTRODUCTiON 1
1.1 Regulatory Background
1.2 Arizona Small MS4s 3
1.3 Town of Marana 4
1.4 Town of Marana Stormwater Management Program 5
1.5 Funding Mechanisms 5
2. TOWN OF MARANA STORMWATER MASTER PLAN 7
2.1 Existing Storm water Conveyance System 7
2.2 Storm water Policy and Criteria 8
2.3 Stormwater Management Alternatives 8
2.3.] Non-structura] Stormwater A]tematives 8
2.3.2 Structural Storm water Measures 9
2.4 Area-Specific Storm water Alternatives 10
2.4.1 Stormwater Planning Area I 10
2.4.2 Stormwater Planning Area 2 10
3. AZPDES PHASE II PROGRAM REQUIREMENTS 12
4. PUBLIC EDUCATiON AND OUTREACH 14
4.1 AZPDES Requirements and Guidelines 14
4.2 Efforts to Date 15
4.2.] Adopt-A-Roadway 15
4.2.2 Adopt-A-Neighborhood ]5
4.2.3 Househo]d Hazardous Waste ]5
4.2.4 Informationa] Material Distribution 16
4.2.5 Water C.A.S.A. ]8
4.2.6 Emp]oyee Bulletin Board ]8
4.2.7 Recycling 18
4.2.8 Treecycle 18
4.2.9 Water Use Monitoring 19
4.2.10 Water Conservation Audits 19
4.2.1 ] Adopt-A-Park (In development) 19
4.3 Action Plan for Public Education and Outreach 19
4.3. ] Education Program and Outreach Activities 20
4.3.2 Information Dissemination 23
4.3.3 Target Audiences And Target Pollutants 24
4.3.3.2 Househo]d Pollutants 26
4.3.4 Population Reached 27
4.3.5 Measurab]e Goa]s 28
4.3.6 Imp]ementation Schedule 29
VB
4.3.7
Staff
4.4 Measurable Goals and Implementation
Table One: Public Education and Outreach Measures and Milestones
5.1
PUBLIC INVOL VEMENT AND PARTICIPATION
5.
5.2
5.2.]
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
5.2.9
5.2.10
5.3
5.3.]
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
AZPDES Requirements and Guidelines
Efforts to Date
Marana Town Code
Adopt-A-Roadway - (See Section 4.2.1)
Adopt-A-Neighborhood - (See Section 4.2.2)
Household Hazardous Waste - (See Section 4.2.3)
Water c.A.S.A.- (See Section 5)
Recycling - (See Section 4.2.
Tree-cycle - (See Section 4.2.8)
Water Use Monitoring - (See Section 4.2.9) _'
Water Conservation Audits - (See Section 4.2.10)
Adopt-A-Park - (See Section 4.2.11)
Action Plan for Public Involvement and Participation
Public Invo]vement and Participation Plan
Public Involvement and Participation Activities
Review of Public Comments
Access to the SWMP and NOI
Measurab]e Goals
Implementation Schedule
Staff
Public Involvement in SWMP Development.
5.4 Measurable Goals ant nplementation
Table Two: Public InvolvemelllJi articipation Measures and Milestones
6.
ILLICIT DISCHARGE DETECTION AND ELIMINATION
6.1 AZ?DES Requirements and Guidelines
6.2 Efforts to Date
6.2. I Signage
6.2.2 Spill/Discharge Cleanup
6.2.3 Marana Town Code
6.2.4 1996 Spa/Pool Code
6.2.5 Tov'n of Marana Land Development Code
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.3.6
6.3.7
6.3.8
6.3.9
6.3.10
Action Plan for Illicit Discharge Detection and Elimination
Detection Methods
Regulatory Mechanisms
Enforcement Policy
Allowable Non-stormwater Discharges per Part V, Section B.3.a.i
Allowable Non-stormwater Discharges per Part V, Section B.3.a.ii
Emp]oyee Training
Public Education
Measurable Goals
Implementation Schedule
Staff
6.4 Measurable Goals and Implementation
Table Three: Illicit Discharge Detection and Elimination Measures and Milestones
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38
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38
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39
42
42
43
44
44
45
46
46
50
50
52
52
52
53
56
56
60
61
62
64
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66
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7.1 AZPDES Requirements and Guidelines
7.2 Efforts to Date
7.2.1 Building Permits
7.2.2 Grading Permits
7.2.3 Ordinances
7.
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.3.6
7.3.7
CONSTRUCTION SITE STORMWATER RUNOFF CONTROL
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77
87
87
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90
92
92
93
93
Action Plan for Construction Site Stormwater Runoff Control
Construction Site Storm water Runoff Control Ordinance
Sanctions and Enforcement Mechanisms
Site Inspection and Plan Review
Public Reporting Procedures
Measurable Goals
Implementation Schedule
Staff
7.4 Measurable Goals and Implementation 94
Table Four: Construction Site Stormwater Runoff Control Measures and Milestones 94
8.
8.1
8.2
8.3
8.3.1
8.3.2
8.3.3
8.3.4
8.3.5
8.3.6
8.3.7
8.4
8.4.1
POST-CONSTRUCTION STORM WA TER MANAGEMENT IN NEW
DEVELOPMENT AND REDEVELOPMENT
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96
97
99
99
100
100
101
102
102
102
AZPDES Requirements and Guidelines
Efforts to Date
Action Plan for Post-Construction Site Stormwater Runoff Control
Post-Construction Runoff Management Practices
Post-Construction Runoff Control Ordinance
Enforcement Procedures
Education Program
Measurable Goals
Implementation Schedule
Staff
Measurable Goals and Implementation 103
Table Five: Post-Constmction Stormwater Management Measures and Milestones _ 103
9. POLLUTION PREVENTIONI GOOD HOUSEKEEPING FOR MUNICIPAL
OPERA TIONS 105
9.1 AZPDES Requirements and Guidelines 105
9.2 Efforts to Date 106
9.3 Action Plan for Pollution Prevention/ Good Housekeeping for Municipal
Operations III
9.3.1 Impacted Municipal Operations 111
9.3.2 Training Program 112
9.3.3 Measurable Goals 1]2
9.3.4 Implementation Schedule 112
9.3.5 Staff 1] 3
9.4 Measurable Goals and Implementation 113
9.4.1 Table Six: Pollution Prevention and Good Housekeeping for Municipal Operations _
Measures and Milestones I] 3
10. IMPLEMENTATION CONSIDERATIONS
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10.1 Qualifying State or Local Program
10.2 Sharing Responsibility
10.3 Reviewing and updating the SWMP
10.4 Monitoring
10.5 Annual Reports
References
Appendix A
Town of Marana AZPDES Compliance Area
NOI and Revisions
Table Seven - Table of Responsible Individuals
Appendix B
lllicit Discharge Detection and Elimination Procedures
Allowable Non-Stormwater Discharges
Dry Weather Outfall Inspections
Dry Weather Outfall Inspection Form
COMMUNITY RESPONSE TRACKING REPORT
Appendix C
Citizen Concern Procedures
Notice of Violation Letters
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Appendix D
Land Development Code- Title 19
Grading Permit Checklists and Applications: Type I and Type 11
Residential and Commercial Permit Checklists
Form A - Major Utility Installation permit
Form B - Public Improvement Dedication to Town permit
Floodplain Use Permit Application
Elevation Certificate
Building Permit Application
Appendix E
Service Request Form
Facilities Maintenance Work Order Request Form
Appendix F
Pima County Stormwater Detention/Retention Manual
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Appendix G
2000 Revised Development Requirements for Drainage in Northern Marana
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1. INTRODUCTION
Surface waters of the United States are susceptible to pollutants carried in stormwater
and urban runoff. Poorly managed stormwater systems can lead to high levels of
nutrients, bacteria, heavy metals, oils, and excess sediment being discharged into
rivers and washes in Arizona. The potential consequences of uncontrolled stormwater
runoff include erosion of topsoil, the degradation of riparian habitat, modified
hydrologic patterns, resulting in flooding problems, and contamination of drinking water
sources. Municipalities can prevent many of these impacts by encouraging or requiring
responsible land use practices within their jurisdictions. Prohibiting activities that
negatively affect the chemical, physical, and biological characteristics of surface
waters will result in an effective stormwater management program that can lead to
improved water quality over time. The community will benefit by a reduction in storm
sewer system maintenance costs, reduced flooding problems, improved visual
appearance of receiving waters, and the conservation of topsoil and vegetation,
resulting in an enhanced natural community of plants and habitat where wildlife and
humans live and recreate.
1. 1 Regulatory Background
"The 1972 amendments to the Federal Water Pollution Control Act (known as the
Clean Water Act rCWA) provide the statutory basis for the National Pollutant
Discharge Elimination System (NPDES) permit program and the basic structure for
regulating the discharge of pollutants from point sources to waters of the United
States. Section 402 of the CWA specifically required EPA to develop and implement
the NPDES program (EPA, 2003)".
The US EPA implemented the NPDES stormwater program in two phases. Phase I
covered large and medium-sized municipal separate storm sewer systems (MS4s),
certain industrial facilities, and construction activities that disturbed more than five
acres. Phase II expanded the NPDES regulatory sphere to include construction
projects disturbing one or more acres and small MS4s that fall within an 'Urbanized
Area' as defined by the (2000 U.S. Census completed by the United States Census
Bureau. The Final Rule for Phase II regulations was published in the Federal Register
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at 64 FR 68721-68851 in December 1999 and regulated facilities or jurisdictions are
required to obtain permits by March 10, 2003.
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The CWA amendments allowed the EPA to authorize the NPDES Permit Program to
state governments, enabling states to perform many of the permitting, administrative,
and enforcement aspects of the NPDES Program. In states that have been authorized
to implement CWA programs, EPA retains oversight responsibilities. (EPA 2003).
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The State of Arizona assumed primacy over the NPDES program in 2002, with the
Arizona Department of Environmental Quality (ADEQ) being tasked with
implementation of the program through legislation codified by the Arizona Legislature
in the Arizona Administrative Code at 18 A.A.C. 9, Art. 9. This legislation established
the Arizona Pollution Discharge Elimination System (AZPDES). "Upon the effective
date of EPA approval of the AZPDES program, the Department shall, under A.R.S.
Title 49, Chapter 2,Article 3.1 and Articles 9 and 10 of this Chapter, administer any
permit authorized or issued under the NPDES program, including an expired permit
that EPA has continued in effect under 40 CFR 122.6" (ADEQ, R18-9-A902).
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1.2 Arizona Small MS4s
The following entities are designated as regulated small MS4s within the State of
Arizona for the initial permitting term (2003-2007):
Cities
Apache Junction
Avondale
Cave Creek
Chandler
EI Mirage
Flagstaff
Gilbert
Goodyear
Guadalupe
Litchfield Park
Marana
Oro Valley
Paradise Valley
Peoria
Prescott
Prescott Valley
South Tucson
Surprise
Tolleson
Youngtown
Yuma
Counties
Coconino
Maricopa
Pinal
Yavapai
Yuma
Non-traditional MS4s
Arizona State University
Northern Arizona University
University of Arizona
Arizona Dept. of Corrections
Yuma Marine Corps
David-Monthan Air Force Base
Arizona State Hospital
Maricopa Community Colleges
Pima Community Colleges
Central Arizona College
Arizona Western College
Yavapai College
VA Medical Centers in Tucson/Phoenix
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If any portion of a small MS4 falls within its respective UA, then only that portion of the
jurisdiction is required to comply with permit coverage under the Phase II program.
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The Town of Marana was designated as a small regulated MS4 because a small
portion of the Town falls within a UA, and comprises the Town's current AZPDES
compliance area. The map in Appendix A illustrates the AZPDES-regulated portion of
Marana. The Town expects a larger compliance area will be designated when the
Urbanized Areas are re-assessed in 2007, with the rapid growth rate the Town is
currently experiencing.
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1.3
Town of Marana
The Town of Marana is a fast growing community northwest of the City of Tucson. The
Town is approximately 118 square miles and has a population of about 26,000. Over
the last decade, the Town's population grew by approximately 40% per year. Land use
within the Town of Marana is primarily vacant undeveloped land (56%), agricu!;Jre
(22%), parks and open space (7%), Town-owned properties (5%), and residential
development (5%). Existing light industrial activities include sand and gravel mines,
construction, and manufacturing facilities. Commercial and industrial facilities make up
just over 3% of the total land use in Marana. The Marana Regional Airport, located on
Avra Valley Road, is a municipal operation covered by an Industrial Stormwater permit.
The largest change in developed land use over the next 20 years is expected to be a
significant increase in the amount of residential development (Town of Marana
General Plan).
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The major watercourses in the Marana area are the Santa Cruz River, the Rillito
Creek, Canada del Oro Wash, and the Brawley Wash. Of these watercourses only the
Santa Cruz River, an effluent-dominated ephemeral waterway, falls within the Tucson
Urba"ized Area and thus within the Town of Marana's stormwater compliance area.
There are numerous ephemeral washes that drain into these larger waterways, but no
known natural perennial waterways exist within the Town of Marana boundaries.
Runoff from both the Tortolita Mountains (to the east) and the Tucson Mountains (to
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the west) also represents a major component of the stormwater drainage pattern in the
Marana area.
1.4 Tawn af Marana Starmwater Management Program
The Town of Marana developed this Stormwater Management Program (SWMP) to
comply with the requirements of the Arizona Department Pollutant Discharge
Elimination System's (AZPDES) small Municipal Separate Sewer System (MS4)
permit (AZG2002-002) for stormwater discharges. The Town of Marana discharges
under the current permit and filed a Notice of Intent (NOI) with this SWMP, to ADEQ in
accordance with Part III and Part V of the general permit. A copy of the NOI and
subsequent revisions are included in Appendix A of this document.
The Town of Marana intends to implement fully the conditions in this SWMP no later
than December 19, 2007. The Town will protect water quality by ensuring to the
maximum extent practicable that no discharge shall cause or contribute to an
exceedance of applicable water quality standards.
1.5 Funding Mechanisms
The NPDES Phase II stormwater program is mandated through the Clean Water Act.
This federal legislation does not provide federal funds to cover the cost of program
coordination and implementation. Regulated jurisdictions are required to provide the
necessary staff, resources, and funding for their stormwater management programs.
Alternatives for funding municipal stormwater programs depend upon specific factors,
including the tax structure or water service systems. Some jurisdictions can fund their
storm water program through a dedicated "utility" fee. Although this does guarantee
substantial resources with which to implement a stormwater plan, it is contrary to the
desire that most citizens have for a reduced tax burden. As a result, a utility tax is often
an unpopular approach for a jurisdiction to take.
Municipalities such as the Town of Marana that, at the present time, do not elect to
impose an additional tax burden on their constituents must fall back on general funds
5
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to implement stormwater programs. In the face of limited resources and stagnant
economies, few jurisdictions have a substantial amount of funds to devote to a
stormwater management program.
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With this constraint in mind, the Town of Marana has developed a stormwater plan that
balances the objectives of the governing legislation with the limited resources of the
.....own. The plan is designed to achieve the required outcomes for the stormwater
;Jrogram, without posing an undue financial burden on the Town or the taxpayers
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The Town will apply for grants for applicable stormwater projects when they are made
available through either lEO or the US EPA.
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Definitions
MS4 Operator: An operator of an MS4 can be a town, city, county;
Department of Transportation, tribe, flood control, drainage improvement or
other special district; university, prison, hospital, or other government -
owned facility.
Municipal Separate Storm Sewer System (MS4): An MS4 is a
conveyance or system of conveyances that transport storm water runoff.
The stormwater conveyance system is separate and distinct from a
combined sewer system, which carries both stormwater and wastewater.
Storm sewer systems can be comprised of pipes, culverts, municipal
streets, detention or retention basins, curbs, gutters, natural channels or
ditches, man-made channels, drywells, and/or treatment systems designed
to remove pollutants from the first flush like oil/grease separators, sediment
filters, or other water quality treatments prior to discharge into the MS4.
Navigable Waters: Waters of the United States that either are connected to
or immediately adjacent to (therefore affecting) waters that may be
navigated in interstate commerce in the United States of America.
Navigable waters of the U.S can include oceans, streams (perennial,
intermittent, or ephemeral), lakes, rivers, washes, playas, wetlands, and
natural or man-made channels (ADEQ, 2004).
Point Source: A point source is any discernible, confined and discrete
conveyance, including, but not limited to, any pipe, ditch, channel, tunnel,
conduit, well, discrete fissure, container, rolling stock, concentrated animal
feeding operation, vessel, or other floating craft from which pollutants are or
may be discharged to navigable waters. Point source does not include
return flows from irrigated agriculture (ADEQ, 2004).
Pollutant: The term 'pollutant' (defined in A.A.C. R18-9-A901) can
generally be thought to encompass any chemical wastes, biological
materials, or constituents discharged to receiving waters. For example,
pollutants could include bacteria from wastewater discharges, sediments
from construction projects or chlorine from a well development project. Even
groundwater redirected to a river could contain pollutants, such as nitrates
or metals, and the project could require an AZPDES permit (ADEQ, 2004).
Regulated Small MS4s: A regulated small MS4 is any small MS410cated
in an Urbanized Area (UA), as defined by the Bureau of the Census. Small
MS4s that are located outside of a UA can be brought under Phase II by the
NPDES permitting authority.
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Small MS4s: A small MS4 is any MS4 not covered under lase lof
NPDES as a large or medium MS4. Large MS4s are those that serve
populations of 250,000 or more. MS4s that serve a population of 249,999 to
100,000 are considered medium MS4s. In addition some MS4s that served
populations of less than 100,000 were brought under the Phase I
regulations and treated as a medium MS4 regardless of their actual
population There is no population threshold associated with small MS4s,
although I are typically understood to be entities with a population of less
than 100,UlJO.
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Urbanized Area: Urbanized Areas (UAs) constitute the largest and most
dense areas of settlement. UA calculations delineate boundaries around
these dense areas of settlement and, in doing so; identify the areas of
concentrated development. UA designations are used for several purposes
in both the public and private sectors. For example, the federal government
has used UAs to calculate allocations for transportation funding, and
planning agencies and developers use UA boundaries to help ascertain
current, and predict future, growth areas. The Bureau of the Census
determines UAs by applying a detailed set of published UA criteria (see 55
FR 42592, October 22, 1990) to the latest decennial Census data. Although
the full UA definition is complex, the Bureau of the Census' general
definition of a UA, based on population and population density, is provided
below. An urbanized area is a land area comprising one or more places --
central place(s) -- and the adjacent densely settled surrounding area --
urban fringe -- that together have a residential population of at least 50,000
and an oV\7.rall population density of at least 1,000 people per square mile
(EPA,2003).
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Waters of the United States: Waters of the United States means:
a. All waters that are currently used, were used in the past, or maY be
susceptible to use in interstate or foreign commerce, including all waters
that are subject to the ebb and flow of the tide;
b. All interstate waters, including interstate wetlands;
c. All other waters such as intrastate lakes, rivers, streams (including
intermittent streams), mudflats, sand flats, wetlands, sloughs, prairie
potholes, wet meadows, playa lakes, or natural ponds the use,
degradation, or destruction of which would affect or could affect
interstate or foreign commerce including any waters:
i. That are or could be used by interstate or foreign travelers for
recreational or other purposes;
II. From which fish or shellfish are or could be taken and sold in
interstate or foreign commerce; or
III. That are used or could be used for industrial purposes by
industries in interstate commerce;
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IV
2. TOWN OF'MARANA STORMWATER MASTER PLAN
In 1998, the Town of Marana released a Stormwater Master Plan that consisted of an
evaluation of the stormwater system (Town of Marana Stormwater Master Plan Phase
I Report). This document detailed the existing drainage patterns and identified "specific
locations where major and local drainage and flooding problems/concerns have been
identified." In 1999, a follow-up report was issued that discussed alternative methods
of managing stormwater that could be taken by the Town of Marana (Town of Marana
Stormwater Master Plan Tortolita Alternative Formulation Report).
A summary of the results of the studies, as they relate to the SWMP, are presented
below.
2.1 Existing Stormwater Conveyance System
The existing stormwater conveyance system in Marana is comprised of:
1. Bank stabilization measures along the Santa Cruz River that are designed for a
1 OO-year flood discharge,
2. Culverts that convey stormwater runoff from the Tortolita Fan under Interstate 10
and to the Santa Cruz River,
3. A curb and gutter stormwater system that services the Ina Road/Thornydale
commercial area,
4. Constructed drainage ways throughout the Continental Ranch subdivisions, and
5. Major detention basins and channel systems on the upper Tortolita Fan to control
runoff associated with Dove Mountain developments.
Of these facilities, the curb and gutter system (3) and the constructed drainage ways
within Continental Ranch (4) comprise the bulk of the stormwater conveyance system
within the Town of Marana's AZPDES compliance area.
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The Ina/Thornydale area represents the core commercial area for the Town of Marana.
The curb and gutter system along these two major roadways collects into storm drains
and retention/detention basins and is conveyed to the Canada del Oro Wash and the
Santa Cruz River.
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Continental Ranch represents an area of rapid development, primarily residential but
with a significant commercial component. Stormwater runoff from the Tucson
Mountains and from Continental Ranch subdivisions is carried Eastward through the
area. Drainage through Continental Ranch collects in constructed and stabilized
drainage channels and empties into the Santa Cruz River.
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2.2 Storm water Policy and Criteria
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The Town of Marana currently employs the following stormwater policy, criteria and
design standards:
1. the Pima County Department of Transportation and Flood Control District's
(PCDOT&FCD) Drainage and Channel Design Standards for Local Drainage,
2. the City of Tucson Department of Transportation's Standards Manual for
Drainage Design and Floodplain Management in Tucson, Arizona,
3. the PCDOT&FCD Stormwater Retention/Detention Manual, and
4. the PCDOT&FCD Hydrology Manual for Engineering Design and Floodplain
Management within Pima County, Arizona.
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2.3 Storm water Management Alternatives
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The Alternative Formulation Report presents a number of methods for managing
stormwater concerns in Marana. These proposed management alternatives consist of
non-structural measures, structural measures, or a combination of both.
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2.3.1 Non-structu ral Stormwater Alternatives
Significant non-structural stormwater pollution prevention control alternatives include:
1. The Town will develop and implement stormwater ordinances, policies, standards,
permits, or other regulatory controls to prevent pollution of runoff from new or re-
development projects. These regulatory controls may include grading ordinances,
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stormwater management ordinances, sediment and erosion control ordinances,
floodplain management ordinances, and subdivision ordinances.
2. The Town will regulate population density and the type of land use through zoning
ordinances.
3. The Town will develop and implement Municipal inspection and maintenance
procedures. These include such practices as inspection of stormwater outfalls,
vegetation removal in concrete-lined channels, sediment and vegetation removal
from detention or retention basins, and maintenance of municipal vehicles and
facilities.
4. The Town has an Emergency Response Program (ERP), which will be updated
periodically as necessary. This pre-planned set of steps to be taken by a
community or government agency intended to "mitigate damage and reduce
threats to public welfare", including erosion and deposition of sediment.
....
5. The Town promotes public education and outreach, and public participation and
involvement. Public awareness of stormwater issues can promote watershed
preservation and protection through an emphasis on the importance of individual
action in stormwater management.
Although the Alternative Formulation Report discusses other non-structural methods,
the methods presented here are those most compatible with the objectives of the
AZPDES legislation. Other non-structural stormwater control methods provide further
opportunities to meet or exceed the requirements of AZPDES if implemented in
conjunction with the Town of Marana Stormwater Master Plan.
2.3.2 Structural Stormwater Measures
Structural stormwater measures primarily involve the construction of stormwater
storage and conveyance infrastructure. By developing and implementing these
structures in manner that promotes improved stormwater quality (i.e. reduced
pollutants), rather than just as a means of control stormwater quantities and flows,
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these measures can provide substantial benefits to the Stormwater Management
Program as required under AZPDES.
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2.4 Area-Specific Storm water Alternatives
The Town of Marana was divided into six (6) geographically-defined planning areas.
Two of these subsections, Stormwater Planning Area 1 and Stormwater Planning Area
2, roughly coincide with the Town of Marana's AZPDES compliance area.
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2.4.1 Stormwater Planning Area 1
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Area 1 extends from Cortaro Road, on the north, to the southern border of the Town,
which is located near Sunset Road. This area includes a portion of the Santa Cruz
River and the Canada del Oro Wash, the confluence of the Santa Cruz and the Rillito
Wash, and commercial areas along Ina, Thornydale, and Orange Grove H0ads. In
addition to containing the sting commercial hub of the Town of Marana (the
Inaffhornydale area), the following land uses are found along the major water~ourses
within this Planning Area: sand and g'1Vel operations, industrial park facilities, and
residential development.
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The typical urban drainage system of curb and gutter, constructed drainageways, and
storm drains characterizes the Ina/Thornydale area. Most of the development in this
area is recent and thus conforms to current drainage design standards, in respect to
the implementation of stormwater detention/retention facilities.
Proposed stormwater management activities for Area 1 include removal of sediment
from "dip crossings" along Silverbell Road after significant stormwater flows and
enforcement of standards for future new-development within the area.
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2.4.2 Stormwater Planning Area 2
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Area 2 consists of that area north of Stormwater Planning Area 1 and south of Lambert
Road. Continental Ranch, which represents the bulk of Area 2, is heavily developed at
present and any remaining available land is rapidly being converted into residential
subdivisions. The major watercourse feature in Area 2 is the Santa Cruz River.
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The Continental Ranch stormwater drainage system consists of street flow,
constructed drainageways, and a limited amount of curb and gutter. Most of the
development in this area is less than twenty years old and conforms to current
drainage design standards.
Proposed stormwater management activities for Area 2 include removal of sediment
from "dip crossings" along Silverbell Road after significant stormwater flows and
enforcement of standards for future new-development within the area.
"""
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3.
AZPDES PHASE II PROGRAM REQUIREMENTS
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The US EPA requires States to ensure that all regulated municipal separate storm
sewer systems (MS4s) develop a stormwater management program that complies with
the National Pollutant Discharge Elimination System (NPDES) program, codified in the
United States Code of Federal Regulations in Title 40, Parts 122, et seq. The Arizona
Department of Environmental Quality (ADEQ) assumed primacy under Section 402 of
the Clean Water Act in 2002 and now administers the NPDES program under the
Arizona Pollutant Discharge Elimination System (AZPDES). The AZPDES program
took the Minimum Control Measure guidelines outlined by the EPA and made them
requirements. The EPA established these requirements with the goal of preventing
pollutants from entering waters of the United States either through urban stormwater
runoff to the municipal separate storm sewer system.
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To obtain an AZPDES permit, the MS4 must submit a Stormwater Management Plan
(SWMP) that, at a minimum, includes the following elements:
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1. Best management practices (BMPs) for implementing each minimum control
measure (MCM) to the "maximum extent practicable"
2. Measurable goals that outline the steps to achieving each BMP
3. Implementation schedule that specifies the timing and frequency of stormwater
management activities
4. Responsible party/parties that will coordinate the implementation of each MCM
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ADEQ has defined Six MCMs necessary for AZPDES compliance:
1. Public Education and Outreach
2. Public Involvement and Participation
3. Illicit Discharge Detection and Elimination
4. Construction Site Stormwater Runoff Control
5. Post-construction Stormwater Management
6. Pollution Prevention and Good Housekeeping for Municipal Operations
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The following sections outline the Storm Water Management Plan for the Town of
Marana and include: 1) a description of each MCM and ADEQ guidelines for
compliance, 2) information on existing Town activities that promote stormwater
pollution prevention, and 3) an action plan and associated schedule for meeting the
requirements of each MCM during the permit period.
*......"
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4. PUBLIC EDUCATION AND OUTREACH
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The key to effective implementation of a stormwater management program is to foster
community awareness and understanding of the issues surrounding stormwater
pollution. Most people are unaware that stormwater flows are one of the most
significant sources of water pollutants. Support for stormwater management increases
when the public understands the importance of stormwater pollution prevention and
recognizes their role in protecting local waterways. As a result, public support for the
SWMP increases the degree of local compliance with program requirements.
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4.1 AZPDES Requirements and Guidelines
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The AZPDES Stormwater Phase II program MCM for public education and outreach
requires regulated MS4s to "implement a public education program to distribute
educational materials to the community or conduct equivalent outreach activities about
the impacts of stormwater discharges on water bodies and the steps that the public
can take to reduce pollutants in stormwater runoff." (V.B.1.a)
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AZPDES regulations require that a permittee's SWMP include the following
information:
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AZPDES Requirement V.B.1.b
I. A description of the education program and outreach activities;
ii. A description of the methods for disseminating information;
III. The target audiences and target pollutants and sources that the applicant
will address in the program, and how they were selected;
IV. An estimation of the number of people with whom the applicant intends
to communicate;
v. A list of measurable goals for the public education and outreach program;
vi. Oates, in terms of months and years, by which the permittee will achieve
specific measurable goals; and
vii. The name(s) and title(s) of the person(s) responsible for implementing and
coordinating the education activities.
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4.2 Efforts to Date
The Town currently supports the following pollution-related public education and
outreach efforts:
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4.2.1 Adopt-A-Roadway
An organization may adopt a specified two-mile reach of roadway in this program. The
organization must commit to one year in the program and must collect trash and debris
from the sides of the roadway at least four times during that year. The Town developed
brochures about the Adopt-a-Roadway program requirements and related safety
issues. The brochures are available to the public in the Marana Municipal Complex
(MMC) lobby and in the Marana Municipal Operations Center (MOC) lobby. Nineteen
of the twenty sections of roadway available for adoption were adopted in 2003.
4.2.2 Adopt-A-Neighborhood
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The Adopt-a-neighborhood program encourages organizations to work together to
improve the standard of living in a community. The organizations must commit to one
year in the program and pick up trash and debris in the neighborhood at least four
times during that year. The area of neighborhood adopted must be at least two square
miles. In addition to cleaning public streets, the organization may also obtain
permission from homeowners in the neighborhood to pick up individual yards. The
Town developed brochures on the Adopt-a-Neighborhood program requirements and
related safety issues. These brochures are available to the public in the Public Works
Department lobby. One of the nine neighborhoods available for adoption was adopted
in 2003.
4.2.3 Household Hazardous Waste
In the past, the Town has sponsored a household hazardous waste collection day. Due to low
turnout, it will be more effective in the future to coordinate with Pima County's successful
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Household Hazardous Waste Program. The Town will advertise the County's program and
encourage participation by Town residents. _
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4.2.4 Informational Material Distribution
The Town of Marana Public Works Department has the following brochures available
to the public in the Municipal Complex lobby or the Water Department lobby:
101 Ways to Reduce Waste from Pima County Environmental Quality,
Fat-Free Sewers from the Water Environment Federation, and
Water Conservation Strategies for Developers and Builders from the Arizona
Department of Water Resources, Tucson Active Management Area.
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The available brochures may change as new or updated information becomes
available.
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The Town of Marana Water Department gives all new customers a bag with the
following items:
. low-flow shower head and sink faucet aerator,
. "Don't Be a Drip. Fix Those Leaks" note pad,
. Water Harvesting brochure from the Water Conservation Alliance of Southern
Arizona,
. The Seven Principles of Xeriscape from the Water Conservation Alliance of
Southern Arizona,
. information on getting rid of water-intensive Bermuda lawn grass from the
Water Conservation Alliance of Southern Arizona,
. a brochure on ways to save water from the American Municipal Water Users
Association,
. Care of Desert-Adapted Plants by Della C. Fletcher and Patricia H. Waterfall
. Why Conserve fact sheet from the Water Conservation Alliance of Southern
Arizona,
. an information guide on evaporative cooler maintenance from the Water
Conservation Alliance of Southern Arizona,
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· a Saving Water survey form offered by the Water Conservation Alliance of
Southern Arizona, and
· Waves - of - Ways to Save Water from the Water Conservation Alliance of
Southern Arizona.
Other brochures available in the Water Department lobby include:
· a Graywater Guidelines booklet from the Water Conservation Alliance of
Southern Arizona,
· Water Harvesting brochure from the Water Conservation Alliance of Southern
Arizona, a brochure on ways to save water from the American Municipal Water
Users Association,
· Why Conserve fact sheet from the Water Conservation Alliance of Southern
Arizona an information guide on evaporative cooler maintenance from the
Water Conservation Alliance of Southern Arizona,
· a Saving Water survey form offered by the Water Conservation Alliance of
Southern Arizona, and
· Waves - of - Ways to Save Water from the Water Conservation Alliance of
Southern Arizona.
Copies of the following information are also available at the Water Department:
· Converting to Xeriscape: Renovate Your Landscape with Style from the
American Municipal Water Users Association,
· Xeriscape Plants for the Desert Southwest from the American Municipal Water
Users Association,
· Visions of Xeriscape from the American Municipal Water Users Association
· Xeriscape. A New Look for Arizona Gardens from the American Municipal
Water Users Association,
· The Complete Guide to Home Water Management from the American
Municipal Water Users Association,
· Can I Use My Graywater brochure from the Water Conservation Alliance of
Southern Arizona,
· Plants for 4 Types of Desert Landscapes from the Water Conservation Alliance
of Southern Arizona, and
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. Practical Plumbing Handbook from the California Urban Water Conservation
Council.
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The available brochures may change as new or updated materials become available.
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4.2.5 Water C.A.S.A.
The Town of Marana Water Department is a member of the Water Conservation Alliance of
Southern Arizona (Water C.A.S.A.). The local water districts and small municipalities, which
make up the Water C.A.S.A. membership, work together to distribute water conservation
information to the public. Member organizations do not have the resources. develop these
materials individually. The Water C.A.S.A. developed a majority of the brochures and fact
sheets distributed by the Town of Marana.
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4.2.6 Employee Bulletin Board
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The Town of Marana Public Works Department has an employee bulletin board
devoted entirely to information on topics such as carpooling, travel reduction, air
quality, and waste reduction and recycling.
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4.2.7 Recycling
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The Town of Marana Public Works Department provides aluminum can recycle
containers in the employee cafeteria. In addition, each employee has a paper recycling
bin by his/her desk.
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4.2.8 Treecycle
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The Town of Marana participates in a larger Christmas tree recycling program
sponsored by the City of Tucson. Each year Marana hosts a number of recycling sites
where trees can be dropped off free of charge. The purpose of the program is to
prevent trees from being dumped in washes or on vacant land. The trees that are
collected are mulched and used to stabilize slopes, for erosion control, and in other
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environmental projects. Brochures are sent out with the Continental Ranch
Homeowners' Association newsletter, which reaches approximately 6200 individuals
within the Town of Marana compliance area, and in the Marana Chamber of
Commerce newsletter.
4.2.9 Water Use Monitoring
Town of Marana Water Department performs another service that will notify customers
when their water usage in higher than normal. This service helps homeowners identify
when they might have leaks that need repair.
4.2.10 Water Conservation Audits
Upon request, the Town of Marana Water Department will perform an audit of a
customer's home water use. Auditors will identify areas of high water-use in the home
and attempt to locate any leaks. This service ensures that Marana Water Department
customers have minimal problems with water runoff from their properties.
4.2.11 Adopt-A-Park (In developmentl
The Town of Marana Parks and Recreation Department is currently in negotiations to
develop and implement an Adopt-A-Park program. One company has expressed an
interest in adopting a Town park and is working out the details of such a program with
the Parks and Recreation Department.
4.3 Action Plan for Public Education and Outreach
The Town of Marana's action plan for public education and outreach on stormwater
impacts is as follows. The format is structured according to the guidelines provided by
ADEQ.
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4.3.1 Education Program and Outreach Activities
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V.B.1.b.i
Include in the SWMP a description of the education program and
outreach activities.
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4.3.1.1
Brochures
Town staff will develop and distribute brochures to target audiences. The brochures
will include information about the types of pollutants generated by the target audience,
what that target audience can do to help reduce stormwater pollution, relevant
stormwater pollution facts, and contact information for the Town of Marana for
submitting questions or concerns. The types of brochures to be developed are as
follows:
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a. Household brochures: The focus of this brochure will be on reduction of
household stormwater pollution and include information regarding proper
septic system maintenance, use and disposal of garden chemicals, and
disposal of household hazardous materials. There will be both Spanish and
English versions of this brochure.
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b. Municipal employee brochures: The focus of this brochure will be on what
employees can do at home to reduce stormwater pollution and the
responsibilities of the Town of Marana to both manage and reduce
stormwater pollution.
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c. Targeted brochures: These brochures will be targeted at specific commercial
groups. The focus of these brochures will be those stormwater pollutants
most prevalent in each commercial group targeted, what steps the target
businesses should take to reduce the discharge of these pollutants, and tips
for businesses to educate their employees about stormwater pollution
prevention requirements.
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Targeted commercial groups may include:
i. Restaurants
ii. Auto service facilities and gas stations
iii. Aggregate, mining, or contracting operations
iv. Hotels/motels
v. Developers and contractors (construction)
4.3.1.2 Stormwater Pollution Prevention Library
The Town of Marana will provide a library of educational material pertaining to
stormwater pollution prevention. The materials for the library will be collected from
federal, state, and local agencies and from any relevant websites. The Environmental
Engineering Division staff will review library materials annually and update or add
materials as necessary.
4.3.1.3 Contact Person
The Town of Marana will designate a principal contact and create a procedure for
effective and timely response to public inquiries, comments, or concerns regarding
stormwater pollution and reports of illegal waste disposal. The Town will revise the
public information contact process as necessary to respond to community needs.
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The Town will advertise the designated person's phone number, email, and/or other
contact information in various locations and formats including all public outreach and
education materials, the SWMP website, and any SWMP-related correspondence with
businesses or members of the public. The designated staff member will note all
comments received in a database maintained for the stormwater management
program.
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4.3.1.4 Web site
Staff will develop a stormwater management website and make it accessible through
the Town of Marana's website. This site will provide information regarding the
stormwater pollution prevention plan, ways people can help, activities they can take
part in, and contact information (phone, address, fax, and e-mail) where the public may
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express concerns or comments and report illegal dumping or other violations. Once
the website is completed, major educational institutions, environmental interests
groups, and governmental entities within the region will be contacted and asked to
provide links on their own websites to the Town of Marana's stormwater pollution
prevention site.
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4.3.1.5 Educational Materials
The Town of Marana will gather and develop educational materials and make them
availabl:::' online and in various public access locations for use in school classes. Staff
will review materials annually and update as necessary. Staff will contact Marana
Unified School District schools about the materials and ask to incorporate them into
their curriculum where possible. This may include staff visiting schools for
presentations of activities and materials.
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4.3.1.6 Storm Drain Marking
Many people are l.r .aware of the connection between discharges to the storm drain
and pollution of surface waters. Storm drain marking provides a visual reminder of that
connection and increased awareness can promote public attention to illicit discharges
and other improper actions leading to stormwater pollution. Storm drain marking is a
way of both informing the public about the importance of controlling discharges into the
municipal storm sewer system and involving them in the prevention of stormwater
pollution.
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4.3.1.7 Database
To facilitate coordination and implementation of all six minimum control measures,
including public education and outreach, a database will be developed by the
stormwater program coordinating staff. This database will track information such as the
materials available in the stormwater library, public comments regarding the
stormwater program, and educational materials.
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4.3.2 Information Dissemination
V.B.1.b.ii Include in the SWMP a description of the methods for disseminating
information.
1. Brochures
Town of Marana staff will distribute brochures in the following manner:
a. Household brochures: The Town will make these brochures
available to the public at Town of Marana municipal buildings and
will send them to all neighborhood associations for distribution to
residents. The Town will include copies of the brochure in the
information packet given out to all new Water Department
customers. The Town will make the Spanish-version brochure
available at Town of Marana municipal buildings.
b. Municipal employee brochures: Staff will send out a stormwater
brochure with Town of Marana employee paychecks.
c. Targeted entities brochures: The Town will send out these
brochures through direct mailing; include as inserts in utility bills or
business licenses; or distribute through mailings of trade
associations, chamber of commerce, or other related organizations.
2. Website
The stormwater pollution prevention website will be advertised in
brochures generated under the SWMP and in Town of Marana water bills.
3. Stormwater Pollution Prevention Library
The stormwater pollution prevention library will be advertised in all
brochures generated under the SWMP, through the Town of Marana's
stormwater pollution prevention website, and in any educational or
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presentation materials. All materials will be available to anyone upon
request.
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4. Contact Person
Contact information for the designated SWMP spokesperson will be
disseminated through the website, brochures, and any other educational,
public information, or presentation material.
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5. Educational Materials
Educational materials will be posted on the Town of Marana's stormwater
pollution prevention website and in various public access locations, such
as libraries. Notices will be mailed directly to each school informing them
of the availability of this resource and asking them to incorporate the
materials into their curriculum when possible.
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6. Storm Drain Marking
The storm drain marking program will be advertised in all brochures
generated under the SWMP, through the Town of Marana's stormwater
pollution prevention website, and in any educational or presentation
materials.
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4.3.3 Target Audiences And Target Pollutants
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V.B.1.b.iii
Include in the SWMP the target audiences and target pollutants
and sources that the applicant will address in the program, and
how they were selected.
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4.3.3.1
Target Audiences
Target audiences include households (public), minority groups, Town of Marana
employees, construction, and industries and businesses recognized as potentially
considerable generators of stormwater pollution. These audiences were chosen, not
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because they are seen as producing significant levels of stormwater pollution at
present, but because the Town wishes to take a proactive approach by providing
educational opportunities to the entire community for learning about stormwater
pollution and ways to prevent it. These particular audiences offer the greatest potential
to achieve stormwater pollution reduction goals.
1. General Public
Much of the stormwater pollution problem stems from lack of information
on the part of the public. This group was selected as an important
audience because all members of the community, regardless of their
occupation or activities, interact with the stormwater system as members
of a household. Making information available to households will help
reduce the problem of household storm water pollution by increasing
awareness of how individuals, often unknowingly, contribute to
stormwater pollution and by providing simple steps that the public can
take to prevent pollutants from getting into the stormwater system. The
difficulty of reaching a dispersed population will be partially offset by
efforts to provide stormwater pollution prevention information to organized
interest groups within the community.
A website will be used to target the public because it makes information
available in a convenient manner to a large percentage of the community.
The website can also be updated easily to provide information to the
public regarding upcoming opportunities to become involved in the
stormwater program. Brochures will also be used to educate households
so that information is available to households who do not have access to
the stormwater pollution prevention website.
2.
Targeted Commercial Groups
Certain business or industry types can significantly contribute to
stormwater pollution by discharging large amounts of pollutants or by
releasing potentially dangerous pollutants into the stormwater system.
Anticipated target groups are hotels/motels; restaurants; aggregate,
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mining, or contracting operations; construction operators (developers and
contractors), and auto service facilities and gas stations.
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All businesses within the attainment area that fall within one of the
targeted categories will receive a group-specific brochure. Brochures
were used for this purpose because they can provide detailed information
to the specific target groups chosen.
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3.
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Youth
Providing educational materials to community youth and building linkages
with education institutions is a proactive approach to addressing the issue
of stormwater pollution. Habits can be extremely hard to break and most
adults have grown up without knowing about stormwater pollution,
possibly thinking that it was all right to dispose of hazardous materials
and other wastes through the stormwater and/or sewer system.
Educational materials developed for youth may include activities, puzzles,
contests for artwork, and calendars.
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4.
Minorities
The largest minority group within the town is the Spanish-speaking
community. To ensure that the Town of Marana reaches this segment of
the population, the Town will make available brochures and other printed
materials in Spanish as well as in English.
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4.3.3.2
Household Pollutants
The household pollutants targeted were chosen, not because they are perceived to be
significant problems currently, but in a proactive attempt to prevent or reduce future
pollution problems. In the case of businesses and industry, the pollutants targeted will
be those most prevalent in each specific target area.
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1. Household Pollutants
The target pollutants that will be addressed in the household brochure
and in any other materials directed toward the public, for the purposes of
education and outreach, are:
a) Lawn and garden chemicals, including herbicides, pesticides, and
fertilizers;
b) Oil, anti-freeze, brake fluid, power steering fluid, etc.,;
c) Household hazardous wastes such as batteries, household
cleaners, medicines and others;
d) Household chemicals such as paint thinners, oil-based paint, pool &
spa chemicals, automotive and household detergents, cleaners, or
bleaches; and
e) Soil sediment runoff from bare soils in yards and gardens.
2.
Commercial Pollutants
Although generalized educational materials are suitable for outreach to
the public (i.e. households), materials provided to specific commercial
groups must be tailored to the activities of the target audience. During the
permit period, a list of the business- or industry-produced pollutants that
need to be targeted will be determined through focus group meetings with
target groups, discussions with community leaders, feedback from the
public, and research into industry procedures.
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4.3.4 Population Reached
VB.1.b.iv Include in the SWMP an estimation of the number of people with
whom the applicant intends to communicate.
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The Town of Marana can reach most of the households within the AZPDES
compliance area using brochures sent out with neighborhood association newsletters.
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The bulk of the current attainment area is a subdivision named "Continental Ranch".
The Continental Ranch home owner's association newsletter reaches approximately
6200 residents, which represents approximately a third of the entire Marana population
at the 2003 filing date of the Town's NOI . Silvermoon is a second homeowner's
association within the Town of Marana AZPDES compliance area. Brochures sent out
with this neighborhood's newsletter will reach 101 households and somewhere
between 275 and 325 residents. Pima Farms/Scenic Drive Neighborhood Association
is a less formal organization that does not distribute newsletters. The association
president does contact most of the 42 households regularly by email. The Town can
re-format information from the brochures and email it to the approximately 100
residents who live in the Ironwood Reserve (formerly Pima Farms) and Scenic Drive
neighborhoods.
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In addition, all of the known target-industry businesses will be directly contacted each
year. These groups may include hotels/motels; auto services; aggregate, mining, or
contracting operations; and restaurants.
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4.3.5 Measurable Goals
_.
V.B. 1.b. v
Include in the SWMP a list of measurable goals for the public education
and outreach program.
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The BMPs and measurable goals for each public education and outreach activity can
be found in Table One: Public Education and Outreach Measures and Milestones
(found on page 4-15).
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The Town will provide or update the following information in the annual MS4
compliance report:
1 . Staff
a. Name and position of persons working on public outreach and education
program
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2. Brochures
a.
Date brochures developed or updated
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b. Number of brochures distributed for each target group (i.e. households,
construction, other target industries)
3. Library
a. Number of visits to library
b. Material added to library
4. Contact person/procedure
a. Name of acting contact person
b. Number of known locations (websites, information guides, phone book,
etc.) in which contact information is publicized
5. Website
a. Date website developed or updated
b. Number of hits to Stormwater web pages
6. Storm drain markina
a. Number of drains marked
t,~""
7. Educational materials
a. List of materials collected from other sources into stormwater references
b. List of materials accumulated
c. Date material(s) developed or updated
d. Number of schools/education programs contacted regarding the materials
e. Description of locations where education materials were made available to
schools/public
f. Number of calendars or educational materials other than brochures
distributed.
4.3.6 Implementation Schedule
"
V.B.l.b.vi
Include in the SWMP dates, in terms of months and years, by which
the permittee will achieve specific measurable goals.
The dates by which each measurable goal will be achieved are specified in Table One:
Public Education and Outreach Measures and Milestones (found on page 4-15).
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4.3.7 Staff
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V.B.1.b.vii Include in the SWMP the name(s) and title(s) ofthe person(s)
responsible for implementing and coordinating the education activities.
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A full-time staff member is the primary coordinator and implementer of the outreach
and education program. A list of individuals responsible for stormwater c ?ach and
education is included in Appendix A. The Town of Marana will update all information
contained in the Appendices as necessary, and immediately send the updated
information to ADEQ to maintain compliance with the MS4 permit requirements. In the
event that any individual is no longer available to work on the stormwater progP'Tl, the
Town of Marana will assign a replacement.
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4.4 Measurable Goals and Implementation
The public education and outreach BMPs, and the measurable goals the Town will use
to implement and track them, are outlined in the following Table. Also included is the
implementation schedule and references to the relevant ADEQ requirements.
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Table One: Public Education and Outreach Measures and
Milestones
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Reference BMP Measurable Goal Target
Date
V.B.1.a 1. The Town a. Develop position requirements. a. Feb.
V.B.1.b of Marana will 2003
hire a full-time b. Create position; approval of Town
staff person to Council is required. b.June
coordinate 2003
and c. Hire full-time staff person.
implement the
education and c. July 2003
outreach
proqram.
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V.B.1.a 2. Staff will a. Categorize target audiences that a. July 2003
V.B.1.b generate and have the greatest potential to impact
distribute a the storm drainage system; identify
set of target- major water quality concerns of each
specific target audience.
brochures
b. Develop brochures, including a b. Dec.
Spanish translation of the household 2004
brochure.
c. Identify contact information for each c. Feb. 2005
target group including the
organizations and associations that
regularly distribute information to
specific target groups.
d. Identify potential partner
organizations that can assist in the d. Feb.
distribution of brochures and other 2005
materials.
e. Distribute brochures to the residents
and target businesses that fall within e. Mar.
the Town's compliance area. At the 2005,
end of the five-year permit period, the periodic
Town of Marana expects to have
reached: 100% of all households
covered by homeowner's
associations, 75% of the
construction/development
community, 75% of auto service
facilities, 100% of sand and
gravel/aggregate operations, 75% of
hotels/motels, and 75% of
restaurants. f. Mar.
2006,
f. Review brochures and update as annually
necessary. thereafter
V.B.1.a 3. Staff will a. Catalog education material pertaining a. May 2003
V.B.1.b create a to the stormwater pollution currently
Stormwater held by the Town of Marana.
Poll ution
Prevention b. Identify a physical location for the b. May 2003
Library library.
c. Contact federal, state, and local c. July 2003
agencies and search for any relevant
stormwater websites to gather
additional material.
"",,\I',he.
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d. Develop a catalog (database) of the d. Aug.
materials. 2003
e. Advertise the Library through e. Begin
brochures, Stormwater Pollution Feb. 2004,
Prevention website, and any other ongoing
educational or presentation materials.
f. Update library; Collect any new or f. Dec.
revised materials and add to library. 2004,
annually
V.B.1.a 4. Staff will a. Identify a principal contact person a. Mar.
V.B.1.b designate a 2003
public b. Create a procedure for effective and
information timely response to public inquiries, b. Apr. 2003
contact comments, or concerns regarding
person and storm water pollution and to reports of
procedures illegal waste disposal.
c. Advertise contact information so that c. Begin
residents are aware of whom to call Nov. 2003;
or email. ongoing
d. The stormwater contact person will d. Begin
review informatic and comments Nov. 2003;
from the public a, ,d determine the ongoing
best response. Appropriate
responses may include providing
information over the phone, byemail,
or by postal mail; referring the caller
to another Town employee for follow-
up; or forwarding the information
provided to the appropriate
department.
e. Review the public information contact e. Periodic,
process and revise as necessary to as needed
respond to community needs.
V.B.1.a 5. Staff will a. Identify the person(s) responsible for a. Jul. 2004
V.B.1.b create a developing and maintaining the
Stormwater website.
Pollution b. Mar.
Prevention b. Work with a consultant to create the 2005
Website website.
c. Begin
c. Advertise the website in Marana Aug. 2005,
water bills, brochures, and any other ongoing
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educational or presentation materials.
d. Contact major educational d.Jul.,2005
institutions, environmental interests
groups, and governmental entities
within the region and ask to provide
links on their own websites to the
Town of Marana's stormwater
pollution prevention website.
e. Sep.
e. Review the website and update as 2005,
needed to include new or revised annually
information.
V.B.1.a 6. Staff will a. Enlist the aid of volunteer a. Feb.
V.B.1.b develop a organizations, schools, and/or 2005
Storm Drain individuals. These groups may
Marking include, but are not limited to
program neighborhood associations, schools,
civic groups, and interest groups.
b. Determine procedure for marking and b. Feb.
ordering materials. 2005
c. Using storm sewer system map,
prioritize storm drain inlets according c. Mar. 2005
to potential risk
d. Mark all storm drain inlets within the d. Mar.
five-year permit period. 2005,
onqoinq
V.B.1.a 7. Staff will a. Identify themes or topics to address a. Jan. 2005
V.B.1.b create in educational materials; determine
Stormwater age groups to be targeted.
Pollution
Prevention b. Collect existing educational b. Feb.
Educational materials; Develop additional 2005
Materials materials.
c. Post materials on the stormwater c.June
pollution prevention website and 2005
place in other public access areas,
such as libraries, Town Hall, etc.
d. Contact Marana school district and d.June
ask that the materials be 2005
incorporated into the curriculum
where possible and discuss further
water quality educational
opportunities in the classroom;
Contact Project WET sponsors and
other environment-oriented education
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groups, and ask them to include this
material in their teacher training
workshops. At the end of the five.
year permit period, the Town of
Marana expects to have reached
25% of all sChool-aged children.
.....
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.",.
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5. PUBLIC INVOLVEMENT AND PARTICIPATION
Efforts by the Town to involve the public in stormwater management plan development and
implementation can bring together much needed community support for the stormwater program
and increase the level of compliance with plan requirements. The success of a public
involvement/participation effort relies on early and frequent involvement opportunities that build
the community's sense of ownership in the stormwater management effort.
5.1 AZPDES Requirements and Guidelines
The AZPDES minimum control measure requirements for regulated MS4s public
involvement/participation include the following BMPs:
· Develop and implement a plan to encourage public involvement and participation in the
development and implementation of the SWMP (V.B.2.a)
· Comply with state and local public notice requirements when implementing the public
involvement/participation program (V.B.2.b)
AZPDES requires that a permittee's SWMP include the following minimum control measures for
public involvement and participation:
=.
AZPoES requirement V.B.2.c
i. A description of the general plan for informing the public of
. involvement and participation opportunities;
ii. The types of activities for public involvement that the program will
include and the target audiences;
iii. A description of the procedure for receiving and reviewing public
comments;
iv. An explanation of how interested parties may access the SWMP and
NOI;
v. A list of measurable goals for the public involvement/participation
program;
vi. Oates, in terms of months and years, by which the permittee will
achieve specific measurable goals;
vii. The name(s) and tille(s) of the person(s) responsible for implementing
and coordinating the education activities; and
viii. How the public was involved in the development of the SWMP
submitted with the NOI.
35
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5.2 Efforts to Date
..
The Town of Marana currently supports the following pollution prevention public involvement
and participation efforts:
-
5.2.1 Marana Town Code
Marana's Town Code includes provisions that encourage public participation in travel reduction
efforts. The relevant sections of Code are as follows:
...,
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Travel Reduction Code - Purpose (Section 10-4-1)
"The purpose of this article, recognizing that motor vehicles are the single greatest
contributor to air pollution, is to improve air quality and reduce traffic congestion
within the incorporated and incorporated areas of Pima County by increasing
alternate mode usage and reducing overall motor vehicle travel for commute trips.
This article shall establish a basis for cooperative effort of the local jurisdictions to
achieve a uniform program for reduction of work related trips by employees working
for major employers subject to this regulation."
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..
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Applicability; voluntary participation (Section 10-4-4)
A. "The provisions of this code shall apply to all major employers."
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B. "Employers or groups of employers with less than 100 full time equivalent
employees at a single work site are encouraged to participate in data collection
and information dissemination efforts and in the preparation of their own travel
reduction plans [TRP] on a voluntary basis. These groups shall be assisted by
the TRP task force, the TRP technical advisory committee and TRP staff, and
shall be eligible for participation in all programs and services. Groups of
employers are encouraged to form transportation management associations."
~
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Requirements for employers (Section 10-4-5)
"In each year of the regional program each major employer shall:
1. Provide each regular employee with information on alternative mode options and
travel reduction measures including, but not limited to: Sun Tran bus routes and
schedules, the Rideshare program, and bicycle routes. This information will also
be provided to new employees at the time of hiring.
...
-
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2. Participate in a survey and reporting effort, forms for which will be provided by
the TRP task force. The results of this survey shall form a baseline against which
attainment of the targets in this section shall be measured as follows:
-,
i. The baseline for participation in alternative modes of transportation shall be
based on the number of employees
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36
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ii. The baseline for VMT [vehicle miles traveled] shall be the average VMT per
employee for employees not residing on the work site.
3. Prepare and submit a Travel Reduction Plan for submittal to TRP staff and
presentation to the TRP Task Force. TRP staff will assist in preparing the Plan.
Major Employers shall submit plans within nine weeks after they receive survey
data results. The Plan shall contain the following elements:
i. The name of the designated Transportation Coordinator.
ii. A description of employee information programs and other Travel Reduction
Measures that have been completed in the previous year.
iii. A description of travel reduction measures to be undertaken by the major
employer in the coming year
4. An approvable travel reduction plan shall meet all of the following criteria:
i. The plan shall designate a transportation coordinator.
ii. The plan shall describe a mechanism for regular distribution of alternative
mode transportation information to employees.
iii. For employers who in any year, meet or exceed annual regional targets for
travel reduction
iv. For employers who, in any year, fall below the regional targets for travel
reduction, the plan shall include commitments to implement:
(1) At least two specific travel reduction measures.. .in the first year of the
regional program
(2) At least three specific alternate modes incentives programs.. .in the
second year of the regional program
v. After the second year, the travel reduction program task force shall review the
travel reduction programs for employers not meeting regional targets and
may recommend additional measures
5. Employers shall implement all travel reduction measures considered necessary
by the task force to attain the following target employee participation in alternate
modes or commuter trip VMT Reductions per regulate work site:
i. 15% of the total employee pool in the first year of the regional program.
ii. 20% of the total employee pool in the second year of the regional program.
iii. 25% of the total employee pool in the third year of the regional program.
6. After the third year of the regional program, either:
i. An increase in employee participation in alternate modes of 1 % per year for
each subsequent year until 40% of all commute trips are made by alternate
modes; or
ii. Alternatively, a reduction in average annual VMT per employee of 1.5% per
year can be selected by a major employer after a 25% alternate mode or
commuter trip VMT reduction usage is achieved.
,-".......
37
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5.2.2 Adopt-A-Roadway - (See Section 4.2.1)
...
5.2.3 Adopt-A-Neighborhood - (See Section 4.2.2)
5.2.4 Household Hazardous Waste - (See Section 4.2.3) -
5.2.5 Water C.A.S.A.- (See Section 4.2.5) ....
5.2.6 Recycling - (See Section 4.2.7)
.....
5.2.7 Tree-cycle - (See Section 4.2.8)
.1')
5.2.8 Water Use Monitoring - (See Section 4.2.9)
5.2.9 Water Conservation Audits - (See Section 4.2.10) -
5.2.10 Adopt-A-Park - (See Section 4.2.11) -
5.3 Action Plan for Public Involvement and Participation
The Town of Marana's action plan for public involvement/participation is outlined below.
The format is structured according to the guidelines provided by ADEQ.
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5.3.1
Public Involvement and 'Participation Plan
-'
V.B.2.c.i
Include in the SWMP a description of the general plan for informing
the public of involvement and participation opportunities.
.,
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The Town of Marana will implement an open and democratic participation program that
recognizes the importance of diverse community representation and offer opportunities for
public participation. The overall goal of the Town of Marana's stormwater pollution prevention
program is to involve the public actively in the development, implementation, and enforcement
of the program. The Town will accomplish this goal through a variety of activities. The following
sections outline the details of these activities.
...
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The Town will implement all public involvement and participation activities according to state
and local public notice requirements. The State of Arizona requires that:
"notices of election, invitations for bids, notices of letting contracts, laws and ordinances,
and other notices of a public character issued by authority of the governing body of any
city or town, shall be published as provided by section 39-204" (AR.S. 9-812).
Section 39-204 of the AR.S. requires that:
A When publication of a notice in a newspaper is directed or authorized by law,
it shall be in a newspaper of general circulation printed in English.
B. If the number of times the notice is to be published is not specified,
publication shall be:
1. If in a weekly newspaper, once each week for two consecutive weeks.
2. If in a daily newspaper, four consecutive times.
C. If the place of publication of the notice is not specified, publication shall be:
3. If by a district, city or town officer, board, or commission, or by any person
in a district, city or town, in a newspaper printed and published within the
territorial limits thereof. If no such newspaper is printed and published
within the limits thereof, publication may be made in a newspaper printed
and published in the county in which the district, city or town is located.
5.3.2 Public Involvement and Participation Activities
,,,#IIi
V.B.2.c.ii Include in the SWMP the types of activities for public involvement that
the program will include and the target audiences.
--
5.3.2.1
Public Meeting/Notices
p~~
At least one public meeting will be held during the first permit year following ADEQ review of the
draft SWMP document and receipt of comments from that agency, to allow public review of,
discussion, and input on the SWMP. The Town will advertise planned meetings through a press
release submitted to local radio stations and newspapers and on the SWMP website. During
,..,;..,~
39
..,
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this first year, the Town will publish at least two public notices to announce the SWMP
development effort, solicit public input, and advertise the Town of Marana's SWMP contact ...
information.
-
The public is target audience for public meetings and notices. This effort will also focus on
reaching the Spanish-speaking community by providing Spanish versions of information
materials at any public meetings.
.....
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5.3.2.2
Adopt-A-Drain
-,
One key to effective public involvement programs is building a sense of ownership towards a
program within the community. The success of Adopt-A-Road and similar efforts has shown that
the community derives a sense of satisfaction from having a direct role in the maintenance of
their surroundings. The Town of Marana would like to capitalize on this sense of community by
allowing groups or businesses to adopt a storm drain. The Town will recognize the adopters by
posting the adopting organization's on the Town's website. This program might require that
sponsors adopt for at least one year and agree to keep their drain opening free of trash and
debris, or to report problems to the Town for maintenance personnel to correct.
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5.3.2.3
Storm Drain Marking
-
Many people are unaware of the connection between discharges to the storm sewer system and
pollution of surface waters. Storm drain marking provides a visual reminder of that connection
and this increased awareness can promote public notice of illicit discharges or other improper
actions leading to stormwater pollution. Storm drain marking is a way of both informing the
public about the importance of controlling discharges into the municipal storm sewer system and
involving them in the prevention of stormwater pollution.
-
.,.,
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5.3.2.4
Volunteer Groups
..
Many volunteer groups with an interest in environmental clean-up, water quality, or other
stormwater-related issues are already in existence. These groups include local environmental
organizations, neighborhood associations, and youth/school groups. Providing opportunities for
-
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40
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these organizations to. participate in, or raise awareness of pollution prevention goals through
effective stormwater management activities is an efficient way for an MS4 to promote the goals
of the SWMP. The Town of Marana will encourage local volunteer organizations to participate
in any ongoing stormwater management efforts. Staff will also be available to conduct
presentations on stormwater management-related topics when requested.
5.3.2.5
Contact Person/Procedure
..........
The designated contact person for the Stormwater Management Plan is listed in Table Seven
Responsible Individuals, contained in Appendix A. The office phone number and email address
will be advertised in various locations and formats including all public outreach and education
materials, the SWMP website, and any SWMP-related correspondence with businesses or
members of the public. All correspondence or phone calls received by this individual will be
entered in a database maintained for the stormwater management program. Staff members will
review and determine the appropriate response and initiate appropriate actions to address the
subject of the messages.
Staff currently record any general concerns regarding Town rights-of-way on a detailed
"Community Response Tracking Report" (at the end of Appendix B) or "Service Request" forms
(see Appendix E for copies of these forms). Staff members address citizen concerns, including
possible zoning violations, according to procedures and guidelines developed by the Planning
and Zoning Division (in Appendix C). Town personnel will record any calls regarding illicit
discharges or other stormwater management issues, and determine the appropriate response
actions. See Appendix A for responsible Environmental Division personnel.
,-
5.3.2.6
Website
-
6_
A stormwater management website will be developed and made accessible as a link through
the Town of Marana's web page. This web site will provide information regarding the stormwater
pollution prevention plan, ways people can help, activities they can take part in, and contact
information (phone, address, fax, and e-mail) where the public may express concerns or
comments and to report dumping or other violations. Once the website is completed, major
educational institutions, environmental interests groups, and governmental entities within the
41
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region will be contacted and asked to provide links on their own websites to the Town of
Marana's stormwater pollution prevention website. ..
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5.3.2.7
Database
To facilitate coordination and implementation of aU . minimum control measures, including
public involvement/participation, the Town of Marana will develop and implement a database.
This database will track information such as public comments regarding the storm\! ~er
program, storm drains marked, storm drains adopted, and volunteer groups with an interest in
stormwater pollution prevention.
...
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...-or
5.3.3 Review of Public Comments
-
V.B.2.c.iii Include in the SWMP a description of the procedure for receiving
and reviewing public comments.
~i
...
Staffs receiving comments on the SWMP are listed in Appendix i-'\ and are si'bject to change
depending upon employment with the Town. Contact information will be ad ised in various
locations and formats including all public meeting, outreach and education materials, the
Stormwater website, and any stormwater-related correspondence with businesses or members
of the public. Staff members will record all comments received in a database maintained for the
stormwater management program. Technical staff will review all comments and an appropriate
response determined and initiated.
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5""'.4
Access to the SWMP and NOI
-
V.B.2.c.iv Include in the SWMP an explanation of how interested parties may
access the SWMP and NOI.
.....
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The Town will post the SWMP and NOI on the Town of Marana's SWMP website for public
review and comment when ADEQ grants final approval to the document after ADEQ's first
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42
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review and comments are addressed. Interested parties may also come to the Public Works
Department to review the SWMP document.
5.3.5 Measurable Goals
V.B.2.c.v Include in the SWMP a list of measurable goals for the public
involvement and participation program
The measurable goals for each public involvement/participation activity can be found in Table
One: Public Involvement/Participation Measures and Milestones (found on page 5-15).
The Town will provide the following information in the annual MS4 compliance report as
applicable:
1 . Staff
a. Name and position of persons working on public involvement/participation
2. Press Releases
a. Date of press release
b. List of media sources to which press release was sent
3. Public input
a. Date of notices for public meeting
b. Date of public meeting
c. Number of people attending public meeting
4. Storm drain markina
a. Number of drains marked
p"~~
lO"~
5.
a.
b.
6.
a.
b.
7.
a.
b.
"',.,;;
Adopt-A-Drain
Number of drains adopted
Number of schools, organizations, and neighborhoods informed about the program
Volunteer aroups
Number of organizations and groups contacted
Number of organizations and groups to which stormwater materials were distributed
Response to public comment
Number of public comments received
Response made for each type of comment received
43
...
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8.
Coordination
a. List of the dates, location, and topics covered for all stormwater-related local or
regional meetings attended by Town of Marana staff
..~,
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9. SWMP/NOI availability
a. Date SWMP and NOI are posted on website
b. Number of requests for in-person review of the SWMP or NOI
....
5.3.6 Implementation Schedule
-
V.B.2.c.vi Include in the SWMP dates, in terms of months and years, by
which the permittee will achieve specific measurable goals.
""
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The dates by which each measurable goal will be achieved are specified in Table Two: Public
Involvement and Participation Measures and Milestones (found on page 5-15).
-
--
5.3.7 Staff
"""
V.B.2.c. vii
Include in the SWMP the name(s) and title(s} of the person(s)
responsible for implementing and coordinating the education
..".
The public participation and involvement program will primarily be coordinated and implemented
by the Environmental Engineering Division. A list of the individuals currently responsible for
implementing and coordinating the public involvement and participation program is contained in
Appendix A. This list is subject to change, and will be updated as necessary. Additional staff
members in the Town of Marana's Public Works Department may provide administrative
support. In the event that any of these three individuals is no longer available to work on the
program, the Town will determine and assign a replacement.
,/lit,
...,
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5.3.8 Public Involvement in SWMP Development.
V.B.2.c.viii Include in the SWMP how the public was involved in the development
of the SWMP submitted with the NOI.
Technical Advisory
The Town of Marana received substantial advisory assistance from other local Phase I and
Phase II MS4s during the development of the Marana SWMP. Each MS4 conducted its own
public involvement efforts and the technical support provided to Marana by each of these
jurisdictions reflects the input they received from their respective constituents.
This assistance came as follows:
a. Attended meeting of Stormwater Management Education and Outreach hosted by
Maricopa County Flood Control; June 14,2001
b. Attended meeting of Stormwater Management Working Group hosted by Pima Association
of Government; week of July 22, 2001.
c. Attended meeting of Stormwater Management Working Group hosted by Pima Association
of Government; week of August 6, 2001.
d. Attended meeting of Stormwater Management Working Group hosted by Pima Association
of Government; September 7, 2001.
e. Attended meeting of Stormwater Management Permit hosted by City of Gilbert; October 3,
2002
f. Hosted meeting with ADEQ and Oro Valley planner on SWMP development; November
26,2002
g. Attended meeting between Oro Valley and ADEQ on SMWP development; December 3,
2002
h. Attended meeting of Stormwater Management Working Group hosted by Pima Association
of Government; December 19, 2002
i. Attended meeting of Stormwater Management Working Group hosted by Pima Association
of Government; January 22, 2003
j. Attended meeting of Stormwater Management Working Group hosted by Pima Association
of Government; February 12, 2003
45
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Focus Groups
Two focus group meetings were held with the local contracting and development industries.
These two groups were considered those with the most potential to be significantly impacted by
the Town of Marana's Stormwater Management Program.
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Forty-two local developers and fifty-three local general contractors were contacted and invited to
attend a focus group meetings hosted by the Town of Marana on February 7, 2002 and
February 14, 2003, respectively.
...
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The focus group presentation targeted explaining the structure and requirements of the
AZPDES permitting program, and included discussion on both the construction and the MS4
general permit. Changes to the permitting process, such as the future on-line NOI submission
form, were discussed. At both meetings, participants were asked to comment on the Town of
Marana ,C'tormwater Management Plan.
-
.....-:-
""
The only potential source of pollutants to wat
participants was "incorrect procedures followea
operators".
ays and the MS4 identified by Focus group
by local aggregate (sand and gravel) truck
.#,
)to
5.4 Measurable Goals and Implementation
-
The BMPs for public participation and involvement and the measurable goals for their
implementation are outlined in Table Two below. This table includes the implementation
schedule and references to the relevant AZPDES requirements.
..
tt,..-
Table Two: Public Involvement/Participation Measures and
Milestones
M
..
Reference BMP Measurable Goal Target Date
v.B.2.a 1. The a. Develop position requirements. a. Feb. 2003
V.B.2.c Town of
Marana b. Create position; approval of Town b. June 2003
will hire a Council is required.
..
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46
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'^-
full-time
staff c. Hire full-time staff person; this person c. July 2003
person to can and probably will be the same
coordinate individual as described in the BMPs
and for public education and outreach.
implement
the
education
and
outreach
oroaram.
V.B.2.a 2. Staff a. Submit at least two press releases for a. Dec. 2005
V.B.2.b will solicit publication in local media outlets.
V.B.2.c public b. Feb. 2006,
input on b. Hold at least one public meeting in after Town
and the first permit year. received and
review of addressed
the c. Announce public meeting in a press comments from
SWMP. release at least 30 days in advance ADEQ
of meeting.
c. Feb. 2006
d. Notify the public of any other local or
regional stormwater-related d. Feb. 2006,
meetings. ongoing
V.B.2.a 3. Staff a. Enlist the aid of volunteer a. Feb. 2005
V.B.2.c will organizations, schools, and/or
develop a individuals. These groups may
Storm include, but are not limited to
Drain neighborhood associations, schools,
Marking civic groups, and interest groups.
program. b. Feb. 2005
b. Determine procedure for marking and
ordering materials.
c. Mar. 2005
c. Using storm sewer system map,
prioritize storm drain inlets according
to potential risk
d. Mark all storm drain inlets within the d. Mar. 2005,
five-year permit period. ongoing
V.B.2.a 4. Staff a. Develop Adopt-A-Drain procedures a.Jan.2006
V.B.2.c will and protocols.
develop
an Adopt- b. Identify all storm drains in the Town b. Feb. 2006
A-Drain to be considered for adoption.
program.
c. Notify the public, volunteer c. Begin Mar.
organizations, and schools about the 2006; ongoing
program.
47
d. Implement program. d. Begin Mar.
2006; onqoinq
V.B.2.a 5. Staff a. Research the various volunteer a. Feb. 2005
V.B.2.c will programs and organizations that
encourage focus on watershed, water quality,
involveme stormwater, or other related issues.
nt of local b. Apr. 2005
volunteer b. Develop a comprehensive database
groups in of volunteer organizations and their
stormwate contact information. c. Ongoing
r pollution
prevention c. Contact volunteer organizations and
effort. discuss how to incorporate
stormwater materials and activities
into existing volunteer opportunities.
These groups may include, but are
not limited to neighborhood d. Ongoing
associations, schools, civic groups,
and interest groups.
e. Ongoing
d. Document existing volunteer
opportunities and their potential for
integrating stormwater issues.
e. As resources allow, provide
information to these groups when
requested regarding stormwater
management and effective
stormwater controls.
V.B.2.a 6. Staff a. Research the various stormwater- a. Mar. 2003
V.B.2.c will related meetings held in Pima
participate County; Meetings include Pima
in local Associations of Government's
and Stormwater Management Working
regional Group. b. Mar. 2003
stormwate
r b. Designate staff person(s) to attend
programs, these meetings, workshops, or
workshop advisory committee meetings. c. Ongoing
s, and
advisory c. Have staff members in attendance at
committee a minimum of 50% of these d. Ongoing
s. meetings.
[continued]
d. Record date, name, and topics
covered for any meetings attended in
the SWMP database.
48
M$i\
..,
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......
..~;"
-
,.
..
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-
A<
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...
~"'.
V.B.2.a 7. S~aff a. Identify a principal contact person. a. Mar. 2003
V.B.2.c will
develop a b. Create a procedure for effective and b. Apr. 2003
procedure timely response to public inquiries,
for comments, or concerns regarding
respondin stormwater pollution and to reports of
g to public illegal waste disposal.
comments c. Begin Nov.
on the c. Advertise contact information so that 2003; ongoing
SWMP. residents are aware of whom to call
or email. d. Begin Nov.
2003; ongoing
d. The stormwater contact person will
review information and comments
from the public and determine the
best response. Appropriate
responses may include providing
information over the phone, by email, e. Periodic, as
or by postal mail; referring the caller needed
to another Town employee for follow-
up; or forwarding the information
provided to the appropriate
department.
e. Review the public information contact
process and revise as necessary to
respond to community needs.
V.B.2.a 8. Staff a. Post SWMP and NOI on Town of a. Nov. 2005,
V.B.2.c will make Marana stormwater program website. after ADEQ
SWMP comments
and NOI b. Advertise the website in Marana addressed
available water bills, brochures, and any other
to the educational and presentation
public and materials; notify any MS4s receiving b. Ongoing
other discharges from the Town of Marana.
MS4s
including
tribal
authorities
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,......"
49
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6. ILLICIT DISCHARGE DETECTION AND ELIMINATION
-
Illicit discharges are any wastes or wastewater that enter a storm drain or storm sewer
system and are not composed entirely of stormwater. Such discharges are illicit because
municipal storm sewer systems are not designed to accept, process, or discharge such
wastes. Sources of illicit discharges can include sanitary wastewater illegally connected
to the storm drain system; effluent from septic tanks; car washing, pool draining or back
flushing, industrial wastewater; improper disposal of auto and household toxics, such as
used motor oil and pesticides; and oil or chemical spills on roadways. (EPA Stormwater
Phase II Compliance Assistance Guide, 2-3) Untreated non-stormwater discharges to
the storm sewer system can contribute to polluted waterways and groundwater. Illicit
discharges can occur during dry weather when there is little or no storm runoff, or during
wet weather. Illicit discharges are more easily detected when there is little or no storm
runoff. Therefore, the Town of Marana's illicit discharge detection and elimination
program will consist of dry weather monitoring. Staff will develop a stormwater ordinance
incorporating the requirements for complying with the 15 day timeframe given to
investigate illicit discharges.
-
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-
.....
..
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6.1
AZPDES Requirements and Guidelines
-
The Minimum Control Measure for illicit discharge detection and elimination requires
regulated small MS4s to:
...
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..
50
...J
AZPDES requirement
V.B.3.a Develop, implement, and enforce a program to detect and eliminate illicit
discharges 0 the small MS4, except those discharges listed below:
""
i. Non-stormwater discharges as listed in Part I, Section C.2; This
exception does not apply to those categories of discharge which the
permittee or applicant has determined to be a significant contributor of
pollutants to the small MS4; or
Jil....
ii. Occasional incidental non-storm water discharges (e.g. non-
commercial or charity car washes, etc.) that the permittee does not
expect (based on information available to the permittee) to be a
significant contributor of pollutants to the small MS4 because of either
the nature of the discharges of conditions the permittee has
established for allowing these discharges to the small MS4 (e.g. a
charity car wash with appropriate controls on frequency, proximity to
sensitive water bodies, BMPs on the wash water, etc.).
V.B.3.b Develop, if not already completed, a storm sewer system map, showing
the location of all outfalls and the names and locations of all waters of the
United States that receive discharges from those.
V.B.3.c To the extent allowable under State, Tribal, or local law, effectively prohibit
through ordinance or other regulatory mechanism, non-stormwater
discharges into the storm sewer system and implement appropriate
enforcement procedures and actions.
V.B.3.d Develop and implement a plan to detect, identify the source of, and
address non-stormwater discharges, including illegal dumping, to the
system.
V.B.3.e Inform public employees, businesses, and the general public of hazards
associated with illegal discharges and improper disposal of waste.
V.B.3.f Conduct dry weather field screening for non-stormwater flows. The
screening must include qualitative field tests based on color, odor, or
visually observed characteristics as indicators of discharge sources. If the
qualitative field tests do not provide enough information for the permittee
to determine the source of the discharge, the permittee must test the
discharge, while in the field, for selected chemical parameters. The
permittee must investigate the illicit discharge within 15 days of its
detection, and must follow up investigation with an action to further study
the source of the discharge and ultimately eliminate the discharge.
"'"
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AZPDES regulations fwrther require that a permittee's SWMP include the following
information:
"""
AZPDES requirement V.8.3.g
I. A description of detection methods;
ii. A description or citation of the established ordinance or other regulatory
mechanism used to prohibit illicit discharges. If the permittee needs to
develop this mechanism, describe the plan and schedule to do so;
iii. A description of enforcement policy and jurisdiction;
iv. A description of the non-stormwater discharges allowed in the MS4 pursuant
to Part V, Section 8.3.a.i;
v. A description of the non-stormwater discharges allowed in the MS4 pursuant
to Part V, Section 8.3.a.ii;
v/. The methods for informing/training employees about illicit discharges;
vii. The methods for informing the public of hazards associated with illegal
discharges and improper disposal of waste;
viii. A list of measurable goals for the illicit detection and elimination program;
ix. Dates, in terms of months and years, by which the permittee will achieve
specific measurable goals; and
x. The name(s) and title(s) of the person(s) responsible for implementing and
coordinating illicit discharge detection and elimination activities.
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...
...
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6.2 Efforts to Date
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6.2.1 Signage
The Town of Marana has an ordinance requiring vehicles to cover all loads with a tarp
and has signs posted throughout the town limits noting the requirement. As of 2003,
sixteen signs are posted along routes with heavy commercial traffic and near town limits.
-
.,
The Town of Marana also has a series of "No illegal dumping" signs posted throughout
the town boundaries. These signs request observers to report illegal dumping by calling
a specified phone number. This number puts individuals in contact with a Pima County
staff person who then forwards any reports of dumping within the Town of Marana limits
to the appropriate Town employee within the Planning and Zoning Division.
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6.2.2 Spill/Discharge Cleanup
When spills, dumping, or other discharges are reported to the Town of Marana, the
appropriate staff member is notified, depending on the circumstances and suspected
A
_.
52
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materials. A truck equipped with barricades and cones, spill packs, cleaner, safety vests,
fire extinguisher, Floor Dry, and containment barrels may be dispatched to the site for
cleanup of the spill. A trained Municipal Operations staff member assesses the site and
determines the severity of the spill or discharge. The trained Municipal Operations staff
member will clean small, non-hazardous spills and dispose of waste material at the
landfill. Individuals presently associated with this activity are listed in the Responsible
Individuals table in Appendix A.
For large or hazardous spills, the initial responder will contact the Town's HazMat
contractor and the local fire department. The contractor shall have all the necessary
hazardous materials and spill disposal training and certifications, and will clean the site
and properly disposes of the waste materials. The cleanup operation shall be conducted
in compliance with Northwest Fire Department guidelines.
6.2.3 Marana Town Code
Marana's Town Code includes regulations that pertain to illicit discharge prevention. The
relevant sections of Code are as follows:
Chapter 7: Buildina
Waste disposal (Section 7-5-2)
"Sewerage systems and/or septic tank systems shall be constructed in
accordance with the standards of the Arizona Department of Health Services
and' the Pima County Health Department, with compliance with such
standards to be certified by the appropriate state or county agency or the
town engineer."
Chapter 10: Health and Sanitation
Dumping and Transportation of Garbage or Aggregate Material
(Article 10-1)
A. "It shall be illegal to transport garbage, refuse, and aggregate material or
like material within the town limits in an open vehicle unless the material is
in a closed container or in an enclosed cargo area."
C. "No vehicle shall be driven or moved on any roadway within the town limits
unless the vehicle is so constructed or loaded as to prevent any of its load
from dropping, shifting, leaking, or otherwise escaping there from, except
that sand may be dropped for the purpose of securing traction, or water or
""'~
53
-,
*",
other substances may be sprinkled on a roadway in cleaning or maintaining
the roadway."
i&i
Illegal dumping (Section 10-1-3)
A. "person who dumps, deposits, places, throws or leaves refuse, rubbish,
debris, filthy or odiferous objects, substances, or other trash on any town
road, public thoroughfare, public airport, the right-of-way to a town road,
public thoroughfare or public airport within twenty (20) yards of a town
road, public thoroughfare or public airport is guilty of a class three (3)
misdemeanor."
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"""
-,
B. "The governing body of the town shall cause signs to be erected at
suitable intervals on roadways, public thoroughfares, public airports, and
rights-of-way within the town limits, including public parks, informing the
public that is unlawful to commit the acts prohibited by this section."
...
F. "The town manager shall enforce the provisions of section 10-1-3 by
prosecuting violators in the Marana Municipal Court pursuant to the
provisions of the code. If such prosecution fails to secure compliance with
the provisions of said sections, or in the event of inability to prosecute
violators by reason of failure to secure jurisdiction over their persons, the
manager shall compel the removal of litter by the procedure outlined in
article 10-2 of the Marana Town Code."
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.....
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Litter on private premises or public place (Section 10-2-2)
"No person shall dump, throw or deposit litter on any public place or private
premises within the town, whether owned by such person or not, except that
the owner or person in control of private premises may maintain authorized
private receptacles for refuse in such a manner that litter will be prevented
from being carried or deposited by the elements upon any public place."
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~"
Owner to maintain premises (Section 10-2-3)
"The owner or person in control of any private premises shall at all times
maintain the premises free of litter, provided that this section shall not prohibit
the storage of refuse in suitable containers."
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Notice to remove (Section 10-2-5)
"To compel the removal of litter through the provisions of this article, if a
person owning or controlling any private premises fails, neglects or refuse '0
remove or properly dispose of litter located on private premises owne 1
controlled by such person, he or she shall be given written notice by.
manager to remove all litter from such private premises within thirty days Hom
the date set on the notice for compliance..."
...'
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....
....
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Removal by town (Section 10-2-8)
"When any person to whom a notice to remove has been given, and on or
before the date of compliance on the notice or within such further time as
may have been granted by the council on appeal, fails, neglects or refuses to
move from such private premises any or all litter, the manager is authorized
and directed to cause same to be removed and disposed of at the expense of
the owner or person controlling such private premises..."
Sewage Sludge - Residential areas (Article 1 0-3-1)
"The use of land within the town that is within one-quarter mile of a human
residence that is also within the town for the application of or injection of
sewage sludge to the surface or within eight inches of the surface shall be
prohibited, except where said residence is owned by the owner of the land
where sludge is to be applied or injected or where written waiver has been
obtained from the resident or owner of the residence and where said waiver
has been filed with the town clerk."
Sewage Sludge - Flood plain areas (Article 1 0-3-2)
"The use of land within the designated flood plain of the Santa Cruz River as
defined by the town zoning ordinance or development code for the application
of or injection of sewage sludge within eight inches of the surface shall be
prohibited."
Sewage Sludge - Other areas (Article 10-3-3)
"The use of any other land within the town for the application of or injection of
sewage sludge to the surface or within eight inches of the surface shall be in
accordance with standards and regulations of the United States
Environmental Protection Agency, the Arizona Department of Health Services
and the Pima County Health Department..."
Travel Reduction Code - Purpose (Section 1 0-4-1 )
"The purpose of this article, recognizing that motor vehicles are the single
greatest contributor to air pollution, is to improve air quality and reduce traffic
congestion within the incorporated and incorporated areas of Pima County by
increasing alternate mode usage and reducing overall motor vehicle travel for
commute trips This article shall establish a basis for cooperative effort of the
local jurisdictions to achieve a uniform program for reduction of work related
trips by employees working for major employers subject to this regulation."
,,,.:$
Requirements for employers (Section 10-4-5)
"In each year of the regional program each major employer shall:
7. Provide each regular employee with information on alternative
mode options and travel reduction measures including, but not
limited to: Sun Tran bus routes and schedules, the Rideshare
55
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program, and bicycle routes. This information will also be provided
to new employees at the time of hiring..."
Chapter 14: Water
Service lines, valves and meter (Section 14-3-6)
"...The customer's lines or piping must be installed in such a manner as to
prevent cross-connection or backflow."
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....
Escaping water (Section 14-10-3)
"No person shall allow water to escape from his or her premises upon public
property, such as alleys, roads or streets, nor upon any other person's
property."
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,-
6.2.4 1996 Spa/Pool Code
The Pima County 1996 Spa/Pool Code was adopted by the Town of Marana, with
amendment. Discharges from pools and spas are regu!ating under this code
according to the following provisions:
-
Waste Water Disposal (Sections 314,415, 508, 616, 714, and 815)
"Backwash water shall be disposed of and contained on site. All discharges
of backwash water shall comply with applicable Pima County ordinances and
Arizona Department of Environmental Quality (ADEQ) Engineering
bulletins..."
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6.2.5 Town of Marana Land Development Code
The Town of Marana's Land Development' Code regulates a wide range of actions that
would result in illicit discharges into the storm drainage system or would otherwise
negatively impact surface waters. The relevant sections of Code are as follows:
b
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Title 5: Zoninq
Zone D - Designated Flood Plain Zone (Reference 05.02.04)
A. "Within Zone D no residential land use shall be permitted, nor shall any
commercial, industrial, or quasi-public use be permitted that entails the
accommodation of persons overnight or the storage of materials or
equipment for more than 24 hours if such materials or equipment would
become hazardous to human health and safety upon exposure to water,
or if such materials or equipment would result in a hazardous
contamination of the Santa Cruz River or Brawley Wash..."
-~
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..
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B. "No construction or excavation that will alter the natural drainage pattern,
direction or rate of flow, or the carrying capacity of the Santa Cruz River
or the Brawley Wash can be performed unless previously approved by
the Town Council after recommendation from the Planning Commission."
Drainage of Surface Waters (Reference 05.05.04)
"No surface water shall be allowed to drain from any lot onto any adjacent lot
except upon written agreement between the owners of said lots"
Pollution Prohibited (Reference 05.02.05)
"No land use shall be permitted which emits or discharges liquids or solid
material on the soil or into surface or ground waters in amounts which result
in pollutants entering any water or drainage system in amounts exceeding the
standards prescribed by those Pima County; Arizona (sic), or federal
agencies having appropriate jurisdiction."
Recreational Vehicle (Reference 05.10.10)
H.11. "All parks and subdivisions shall have refuse collection areas approved
by the Planning Administrator..."
Resort and Recreation Zone (Reference 05.11.07)
O. "Each property shall provide adequate and accessible trash disposal
areas.. ."
Light Industrial (Reference 05.12.02)
I. 7 "All outdoor trash and refuse storage areas shall be enclosed..."
Heavy Industry (Reference 05.12.03)
H.8 "All outdoor trash and refuse storage areas.. .shall be enclosed..."
..
Title 8: Buildina Code
Drainage of Lots (Requirement 08.03.03)
"Surface water shall not be allowed to drain from any lot onto any adjacent
lot, parcel, or easement except upon written agreement with the owner of
said adjacent lot, parcel, or easement."
Waste Disposal (Requirement 08.03.09)
"Sewerage systems and/or septic tanks shall be constructed in accordance
with the standards of the Arizona Department of Health Services and the
Pima County Health Department..."
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Title 11: Prohibition of IlIeaal and Nuisance Uses
"The purpose of this section is to promote the health, safety, economic,
aesthetic, and general welfare of the citizens of the Town of Marana.. .by
establishing requirements for the maintenance of all land.. ."
...
Nuisances Prohibited (Requirement 11.02)
8. "No person shall compost or permit the composting of organic waste;
manure; tree, grass, or shrub clippings; grease; bio-solids, or other s:'Tlilar
material on any property within the Town of Marana limits except for
com posted material that is used directly on the property from which it
composted."
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D. "No person ~ :1 allow a grease pond or open grease storage facility to be
maintained Oi I any property within the Town of Marana limits."
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Title 17: Environmental Resource Preservation. Native Plant Protection.
Landscape Reauirements
.
Protected Ridges, Protected Peaks, Riparian Areas, Wildlife Corridors and Areas
of Significant Vegetation (Section 17-1-1)
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D. "All areas determined to inclL'':le ripa x wildlife linkages and corridors
shall be protected and rer ;1 unc 'oed throughout the course of
development and shall be fenced-off dunng construction."
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Landscape Requirements: Intent and Objectives (Section 17-3-2)
"This chapter will utilize landscaping to achieve the following goals and
objectives.. .
b. helping control and utilize storm water runoff...
f. control soil erosion..."
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...
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Title 21 : Flood Plain Erosion Hazard Manaaement Code
Short Title (Reference 21.01)
8.3. "The Town will acquire by appropriate means, and whenever possible, lands
within the regulatory floodway, floodway fringe and erosion hazard areas.
These lands are to be managed to preserve or enhance natural values and
express?d resource management goals."
...
.II>.
8.5. "Natural flood areas, streams, washes, arroyos, rivers, and drainage
courses are, whenever possible, to be preserved in their natural riverine
environment. Any land use proposal which proposes this approach will
be considered superior to all others."
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C. "It is the purpose of this Code to protect the public health, peace, safety,
comfort, convenience and general welfare of the citizens of the Town of
Marana by adopting regulations designed:
1. To minimize flood and erosion damage and reduce the heights of
floods.
2. To prevent unwise encroachment and building development within
areas subject to flooding. ..[and] erosion, and to assure that the flood
carrying capacity within the altered and/or relocated portion of any
watercourse is maintained."
Floodway Requirements (Reference 21.08)
8.1. "Extraction of sand, gravel, and other materials is allowed within the
floodways and flood hazard areas provided that excavations are not so
located nor of such a depth, or width, or length, or combination of depth-
width-length as to present a hazard to structures..., to the banks of
watercourses, to other property, or which adversely affects groundwater
recharge."
8.2. "There shall be no stockpiling within the floodways and flood hazard areas
of materials or tailings that may obstruct, divert, or retard the flow of
floodwaters except as reviewed and approved by the Town Floodplain
Administrator on an individual Floodplain Use Permit basis."
8.3. "Excavations may be allowed only in those reaches of water courses
which have, at a minimum, a balanced sediment system, Le. the
sediment coming into the reach is equal to or greater than the sediment
leaving the reach and the long term sediment balance for the river
system indicates that the stream channel will aggrade."
8.4. "Due to the rapidly changing hydraulic characteristics of watercourses in
the Town of Marana, and the effects excavations have on these
characteristics, Floodplain Use Permits for excavations shall only be
renewed for a limited time period, not to exceed one (1) year, subject to
annual renewal upon review by the Town Floodplain Administrator."
8.5. "In addition to those conditions provided for elsewhere, floodplain use
permits for excavations may impose conditions regarding the area and
location in which excavations are allowed, the maximum amount of
material to be excavated, and other reasonable restraints on the
methods of operating, including time restraints."
"",4
8.6. "Any extraction of sand and gravel or related materials in a floodway or
flood hazard area will only be allowed after the effective date of this
Code if a reclamation plan is also provided for the extraction operation.
The reclamation plan shall show in sufficient detail the actions which are
proposed to reclaim the excavated areas so that all adverse effects of
extraction are mitigated."
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...
C. "No use shall t;)e allowed which:
1. Acting alone or in combination with existing or future uses creates a
danger or hazard to life or property...
~
4. Increases erosion potential upstream and/or downstream.
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5. Places a waste disposal system wholly or partially in a floodway.
.",..
Floodway Fringe Area Requirements (Reference 21.09)
B.1.a. "Any fill proposed to be deposited in the flood way fringe must be
shown to have some beneficial purpose and the amount thereof not
greater than is necessary to achieve that purpose, as demonstrated
by a plan submitted by the owner showing the uses to which the filled
land will be put and the final dimensions of the proposed fill or other
materials."
....
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B.1.b. "Such fill or other materials shall be protected against erosion by
riprap, vegetative cover, bulk heading, or other approved methods."
-
B.3.a. "The storage and/or processing of materials that are buoyant,
flammable, explosive or that could be injurious to human, animal, or
plant life in time of flooding is prohibited."
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BA.a. "All new and replacement water supply, treatment, and sewage
collection and disposal systems built in a regulatory floodplain shall be
designed to eliminate to the degree physically possible, in accordance
with Arizona Department of Environmental Quality guidelines,
infiltration of floodwaters into these systems and discharge from these
systems into flood waters."
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BA.b. "On-site sanitary waste disposal systems shall be located to avoid
impairment to them or contamination from them during flooding."
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B.6. "In order to minimize erosion and sedimentation in the run off from the
Tortolita mountains, native vegetation shall not be removed from that
part of the Town of Marana East of 1-10 except where the Town
Engineer has approved the methods to control erosion,
sedimentation, flow and related factors..."
.....
....
Copies of the floodplain use permit and elevation certificate are contained in Appendix D
of the SWMP.
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6.3 Action Plan for Illicit Discharge Detection and Elimination
....,
The Town of Marana's action plan for illicit discharge detection and elimination follows
the current AZPDES guidelines.
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6.3.1 Detection Methods
V.B.3.g.i
Include in the SWMP a description of detection methods.
Illicit discharges into the municipal separate storm sewer system will be detected
through a combination of visual field inspections and public reporting.
6.3.1.1
Field Inspections
All known outfalls that discharge to surface waters will be visually inspected during the
dry season. Field inspections will consist of visits to outfall locations using the storm
sewer system map and documentation of visual observations on an "Illicit Discharge
Detection Inspection Form", which may be in electronic form. Detailed procedures for
qualitative field inspection activities will be developed during the permit period and will
include inspections for and a description of odor, color, turbidity, floatable matter,
deposits, stains, vegetation, and damage to outfall structures.
Dry weather outfall inspection procedures developed as a part of this SWMP (part of the
Town's phase-in to the program) are contained in Appendix B and will be updated and
revised as necessary. Dry weather inspectjons will supplement the inspections carried
out by zoning inspectors.
6.3.1.2
Public Reporting
The observations of community members are often an important source of information
regarding illicit discharges. As outlined in the previous section on public
involvement/participation, the Town will develop and implement a procedure for the
public can report suspect discharges. The Town of Marana will also encourage local
community groups to conduct volunteer monitoring. Reported discharges will be subject
to the same or similar procedures as the regular visual field inspections.
61
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6.3.2 Regulatory Mechanisms
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V.a.3.g.ii
Include in the SWMP a description or citation of the established
ordinance or other regulatory mechanism used to prohibit illicit
discharges. If the permittee needs to develop this mechanism,
describe the plan and schedule to do so.
.....
An illicit discharge ordinance should include, at a minimum, the following key
elements:
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1. Prohibitions on illegal dumping or discharges into the storm drainage system
2. Prohibitions on illicit connections from sanitary sewers to the storm drainage system
3. Authority to inspect properties for illicit discharges
4. Penalties and enforcement options
".,.
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The Town of Marana's Land Development Code and various Pima County Codes
currently regulate non-stormwater discharges. Relevant portions of the Codes will be
cited under each of the four key elements required for an illicit discharge ordinance.
.
6.3.2.1
Illicit Dumping or Discharges
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The Town of Marana's overall commitment to prevention of surface water pollution can
be seen in a number of sections of the Town Code and Land Development Code.
-
a. Town Code
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. Article 10-1 of the Marana Town Code reduces the likelihood that pollutants will be
transported into local waterways by requiring: those transporters of garbage and
aggregate material cover their loads and otherwise prevent spillage of these
materials).
. Sections 10-1-3 and 10-2-2 require that no individual dumps or otherwise leaves
refuse on any private or public property without proper permit or authority.
. Section 10-2-3 requires that property owners keep their property free of debris,
garbage, or other material.
,Ji..
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· Marana Pool and Spa Code, as adopted from 1996 Pima County Pool/Spa Code,
(Sections 314, 415, 508, 616, 714, and 815) requires that property owners not allow
water to escape from the premises onto public or private property, and that pool and
spa owners not discharge of water in a manner that it leaves the site.
· Section 7-5-2 requires that all buildings have proper waste disposal systems and
· Sections 1 0-4-1 and 10-4-5 promote travel reduction by local employers.
· Current policy for customer response establishes an expedient timeframe for
investigating issues and following up with customers. Forms will be updated to
establish that all responses to stormwater reports received regarding possible illicit
discharges be investigated and responded to within 15 days.
b. Land DevelaDmen! Code
The area surrounding the major washes and subject to flooding is zoned as a
"Designated Flood Plain Zone" and the use of these areas is rigorously controlled (see
References 05.02.04, 21.01, 21.08, and 21.09). Movement of surface runoff is highly
regulated (see Reference 05.05.04), actions which contribute pollutants to surface
waters and ground water are expressly prohibited (see Reference 05.02.05), trash and
refuse must be adequately contained (see References 05.10.10, 05.11.07, 05.12.02,
05.12.03), and riparian areas and native vegetation are protected and proper
landscaping is required (see Sections 17-1-1,17-1-2, and 17-1-3; Reference 21.09).
6.3.2.2
Illicit Sewer Connections
The Town of Marana does not operate a sewer system or wastewater treatment plants.
All sewer systems within the Town boundaries are under the control of Pima County
Wastewater Department (PCWW). When reviewing grading and development plans, the
Town requires that permit applicants submit proof that proposed sewer connections and
installation methods have been approved by PCWW.
6.3.2.3
Inspection Authority
Determining the source of an illicit discharge sometimes requires inspection of private
property deduced as a likely source of the discharge. Currently, the Town of Marana
63
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employs informal surveillance to identify properties that are in violation of the Town Code
prohibiting un-contained trash and debris on the property. A Zoning officer responds to
reports from residents and conducts casual inspections. These inspections may cover a
wide variety of issues including a report of trash or debris, non-functioning vehicles, and
excess number of animals on private property. This inspection directly benefits the
Town's Stormwater Management Program by minimizing the amount of trash and debris
uncontained or improperly stored in areas where it can be transported into local
waterways.
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If a zoning officer finds a violation on a specific property, the zoning officer will first try to
call the property owner and notify them of the problem. If the phone call does not result
in action to resolve the issue, a series of letters are sent to the resident or business
owner until corrective action is taken. If, after the third letter, a problem still exists, the
Town will take legal action against the property owner in the form of fines and/or criminal
charges. An outline of the draft "Code Enforcement Process for Citizen Concern Report"
and copies of notification letters are provided in Appendix C.
~.
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The Town of Marana will follow these existing procedures for illicit discharge detection
and elimination unless they prove to be inadequate, at which point additional inspection
authority will be developed and implemented through ordinance.
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6.3.2.4
Enforcement
The enforcement policy for violations of an'illicit discharge Code will be discussed in the
following section.
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6.3.3 Enforcement Policy
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V.B.3.g.iii Include in the SWMP a description of enforcement policy and
jurisdiction.
Currently, violation of any provision of the Land Development Code and the Town Code
constitutes a Class 1 misdemeanor. Non-compliance is subject to the issuance of a stop-
work order and/or fines.
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64
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Beyond enforcement policies for existing Town of Marana ordinances, staff will consider
developing a plan for additional enforcement actions. Any new enforcement policy, if
deemed necessary, may include verbal or written warnings, administrative actions, fines,
cost recovery, and/or legal action.
6.3.4 Allowable Non-stormwater Discharges per Part V, Section
B.3.a.i
V.B.3.g.iv Include in the SWMP a description of the non-stormwater
discharges allowed in the MS4 pursuant to Part V, Section 8.3.aJ
In Part I, Section C.2., ADEQ lists the following allowable non-stormwater
discharges:
1. WATER LINE FLUSHING
2. LANDSCAPE IRRIGATION
3. DIVERTED STREAM FLOWS
4. RISING GROUND WATERS
5. UNCONTAMINATED GROUNDWATER
INFILTRATION (AS DEFINED IN 40 CR
35.2005(20))
6. UNCONTAMINATED PUMPED
GROUNDWATER
7. DISCHARGES FROM POTABLE WATER
SOURCES
8. FOUNDATION DRAINS
9. AIR CONDITIONING CONDENSATION
10. IRRIGATION WATER
11. SPRINGS
12. WATER FROM CRAWL SPACE PUMPS
13. FOOTING DRAINS
14. LAWN WATERING
15. INDIVIDUAL RESIDENTIAL CAR WASHING
16. FLOWS FORM RIPARIAN HABITATS AND
WETLANDS
17. DECHLORINATED SWIMMING POOL
DISCHARGES
18. SPILLS
19. STREET WASH WATER
20. DISCHARGES FROM EMERGENCY FIRE
FIGHTING ACTIVITIES
65
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The Town of Marana believes that these discharges are not impa:';ng surface water
quality. This belief is based on knowledge of the Town's watercourses and discussions
with local community leaders, businesses, and the public. The only exceptions to this
would be if:
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1. A discharge is 'entified in a Total Maximum Daily Load (TMDL) as contributing
pollutants to a'. Impaired waterway or
2. The Town of Marana, in the future, identifies a discharge as impairing a waterway
through the contribution of pollutants.
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Under either of these circumstances, the Town may consider one or'lore of these
"allowable illicit discharges" to be significant contributors of pollutants to a waterway and
the Town will appropriately address the problem.
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_Wi
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6.3.5 Allowable Non-stormwater Discharges per Part V, Section
B.3.a.ii
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V.B.3.g. v
Include in the SWMP a description of the non-stormwater discharges
allowed in the MS4 pursuant to Part V, Section B.3.a.ii.
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Occasional incidental non-stormwater discharges are allowable as long as the permittee
feels that they would not be significant contributors of pollutants to the small MS4. These
occasional discharges are most commonly associated with non-commercial or charity
car washes.
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~i
The Town of Marana does not perceive the above type of discharges to local waterways
to be significant contributors of pollutants due to the frequency or nature of these
discharges. This presumption is based on knowledge of the Town's waterways and
discussions with local community leaders, businesses, and the public. The only
exceptions to this would be if:
-
1. A discharge is identified in a Total Maximum Daily Load (TMDL) as contributing
pollutants to an impaired waterway or
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66
2. The Town of Marana, in the future, identifies a discharge as impairing a waterway
through the contribution of pollutants.
Under either of these circumstances, the Town may consider an occasional incidental
non-stormwater discharge to be a significant contributor of pollutants to a waterway and
the Town would appropriately address the problem.
6.3.6 Employee Training
V.B.3.g.vi Include in the SWMP methods for informing/training employees
about illicit discharges.
All employees of the Town of Marana will receive information regarding the importance
of identifying and eliminating illicit discharges. Stormwater program staff will present the
information in a flyer or brochure included once a year in employee paychecks.
Employees whose job responsibilities are directly associated with detection and
elimination of illicit discharges will receive appropriate training through their respective
departments. This training may be coordinated with existing training programs. During
the permit period, staff will review the existing training programs and determine whether
additional training is necessary to address illicit discharges. If additional training is
required, staff will develop or update procedures and materials within the permit period.
6.3.7 Public Education
V.B.3.g.vii Include in the SWMP methods for informing the public of hazards
associated with illegal discharges and improper disposal of waste.
Brochures described in the section on public education and outreach (Section 4.3.1) will
include information about the hazards associated with illegal discharges and improper
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,. .~.~-,._"-"".,-~~..__,.~.,...o,._.w~;_"'~_~
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disposal of waste. The Town will also post this information on the Town's stormwater
website and may include it in other educational and presentation materials.
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6.3.8 Measurable Goals
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V.B.3.g. viii Include in the SWMP a list of measurable goals for the illicit
detection and elimination program.
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The measurable goals for each illicit discharge detection and elimination activity
can be found in Table Three: Illicit Discharge Detection and Elimination
Measures and Milestones (found on page 6-22).
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The following information will be provided in the annual compliance report:
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1. Storm sewer system map
a. Date map developed
b. Date and description of any modifications to the map
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2. Ordinance
a. Date and description of ordinances passed for the purpose of meeting the illiCit
discharge detection and elimination control measure
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3. Illicit discharae detection and elimination
a. Number of outfall inspections performed during fiscal year
b. Number of illicit discharge reports received from the public or inspectors
c. Number and type of enforcement action(s) taken on illicit discharge detection
case
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6.3.9 Implementation Schedule
V.B.3.g.ix Include in the SWMP dates by which the permittee will achieve
specific measurable goals.
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The dates by which each measurable goal will be achieved are specified in Table Three:
Illicit Discharge Detection and Elimination Measures and Milestones (on page 6-22).
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6.3.10
Staff
V.B.3.g.x
Include in the SWMP the name(s) and title(s) of the person(s)
responsible for implementing and coordinating illicit discharge
Staff in the GIS, IT, and Environmental Division will update and revise the storm sewer
system map. If the Town determines that the Town of Marana does not have sufficient
staff resources to update this map, this and any other steps in this BMP may be
contracted out to a consulting firm.
Town personnel will draft any necessary ordinances or revisions to ordinances, with final
review and approval by the Town Manager, Assistant Town Manager, and Town
Council.
Staff members will develop inspection procedures, databases, and forms.
Town of Marana staff or trained volunteers will perform dry weather inspections.
Staff coordinates and implements public and employee education. A staff member will
receive and record public inquiries or citizen reports regarding urban runoff discharges.
In the event that any individual listed in the Responsible Individuals Table in Appendix A
is no longer available to work on the project, the Town will designate a replacement.
6.4 Measurable Goals and Implementation
The BMPs, and measurable goals by which they will be implemented, are outlined in the
following Table. Also included is the implementation schedule and references to the
relevant ADEQ requirements.
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Table Three: Illicit Discharge Detection and Elimination Measures and
Milestones
Reference
V.B.3.a
V.B.3.d
V.B.3.g
V.B.3.b
V.B.3.g
V.B.3.c
V.B.3.q
BMP
1 . Staff will
develop a
procedure for
receiving,
addressing,
and recording
illicit
discharge
reports.
2. Staff will
create a
storm sewer
system map
that will show
all outfalls
and the
names and
locations of all
waters of the
United States
that receive
discharges
from those
outfalls.
3. Staff will
develop, if
a. Review existing citizen concern a. Oct. 2003
reporting procedure
b. Nov.
b. Draft new procedure including 2003
contact person and phone number,
reporting forms, and protocols for
addressing citizen concern reports.
Measurable Goal
c. Customer inquiries or reports
regarding oossible illicit discharges
will be recorded and investigated
within 48 business hours. The Town
will provide copies of reports upon
request by ADEQ.
d. Inventory existing "No Dumping" and
"Report Illegal Dumping" signs.
e. Replace existing signs as needed.
Add new signs in response to citizen
reports.
a. Collect all existing information about
the storm drainage system and
outfalls; contact as necessary Pima
County, the City of Tucson, the U.S.
Geologic Service and other
jurisdictions.
b. Determine map specifications
including scale, the types of
information to include, and format.
c. Map known outfalls and receiving
water locations. This map will be
created an ERSI compatible format,
such as ArcView Shapefiles, Arclnfo
coverage, or ArcGIS geodatabase.
Verify outfalls and survey for possible
missed locations through visual
inspection. This step will be
combined with the field inspections
required in V.B.3.d.
a. Identify whether current Town Code
adequately addresses illicit discharge
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Target Date
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c. Oct. 2003
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d. Beg. Oct.
2003,
ongoing
e. Ongoing
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f. Ongoing
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a. Dec.
2003,
update
periodically
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b. Jan. 2004
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c. Apr. 2004
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d. May
2005,
ongoing
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a. Dec.
2006
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V.B.3.d
V.B.3.f
V.B.3.g
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necessary, an
ordinance or
other
regulatory
mechanism to
effectively
prohibit non-
stormwater
discharges
into the storm
sewer system
4. Staff will
develop and
implement a
program to
detect and
eliminate illicit
discharges
detection and elimination.
b. Outline any necessary additions to
existing Town Code if applicable.
b. Feb.
2007
c. Draft new Code provisions.
d. Submit draft Code for legal and c. July 2007
technical review.
d. Sept.
e. Submit Code for approval by Town 2007
Council.
e. Oct. 2007
f. Once new provisions are approved,
begin implementing. Ordinance f. Nov.
approval and implementation will be 2007,
done in accordance with the public ongoing
notice requirements of the State of
Arizona (A.R.S. 39.204 and 9.812).
a. Identify priority areas for a. Sept.
investigation. The primary priority for 2004
inspection will be storm sewer
outfalls and may include areas with
greater potential for contributing
hazardous materials or large
quantities of pollutants, areas in close
proximity to waterways, and areas
with high number of past illicit
discharge incidents.
b. Sept.
b. Develop a plan for inspecting outfalls. 2005
This plan will guide the scheduling of
inspection activities and appropriate
procedures of assessment. The
Town will include the number of
outfalls inspected annually to ADEQ
with the annual MS4 report form.
c. Oct 2004
c. Develop a procedure for determining
whether or not a discharge is illicit,
whether or not it is contaminated, and
whether or not it is allowable under
the Town of Marana's permit. d. Oct. 2004
d. Develop procedures to trace an illicit
discharge.
This procedure may involve visual
inspection of the surface area, visual
inspections of the storm drain
systems, and/or more detailed e. Oct. 2007
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V.B.3.e
V.B.3.g
4. Staff will
develop and
distribute
information to
employees,
businesses,
and the
general public
regarding
hazardous
associated
illicit
discharges
assessment methods.
e. Develop procedures to eliminate an
illicit discharge. This procedure will
consist of the following elements:
notification of appropriate authorities;
notification of and consultation with
property owner regarding the
discharge, necessary corrective
action(s), and a timeframe (less than
15 day) for eliminating the discharge;
and escalating enforcement and legal
action, if necessary.
p,",
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a. Develop brochures, including a a. Dec.
Spanish translation of the household 2004
brochure.
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b. Identify contact information for each b. Feb.
target group including the 2005
organizations and associations that
regularly distribute information to
specific target groups.
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c. Identify potential partner c. Feb. 2005
organizations that can assist in the
distribution of brochures and other
materials.
d. Distribute brochures to residents and
target businesses falling within the
Town's compliance area. At the end
of the five-year permit period, the
Town of Marana expects to reach:
100% of all households covered by
homeowner's associations, 100% of
Town employees, 75% of the
construction/ development
community, 75% of auto service
facilities, 100% of sand and
gravel/aggregate operations, 75% of
hotels/motels, and 75% of
restaurants.
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d. Mar.
2005,
periodic
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7. CONSTRUCTION SITE STORMWATER RUNOFF
CONTROL
Construction sites are likely to cause significant surface water quality impacts when
sediment and erosion controls are lacking or inadequate. These negative effects are
associated with both the sediment washed into watercourse and the pollutants bound to
those soil particles. These pollutants, which are often the primary concern for the impairment
of surface waters" can include nutrients, pesticides, oils and grease, concrete truck
washout, and construction chemicals and debris.
7.1 AZPDES Requirements and Guidelines
The regulatory requirement for construction site stormwater runoff control is that regulated
MS4s:
V.B.4.a Develop, implement, and enforce a program to reduce pollutants in any
stormwater runoff to the small MS4 from construction activities that result
in a land disturbance of greater than or equal to one acre. Reduction of
stormwater discharges from construction activity disturbing less than one
acre must be included in the program if that construction is part of a larger
common plan of development or sale that would disturb one acre or more.
If the Department waives requirements for stormwater discharges
associated with small construction activity, defined under 40 CFR
122.26(b)(15)(i), the permittee is not required to develop, implement,
and/or enforce a program to reduce pollutant discharges from these sites.
V.BA.b Using an ordinance or other regulatory mechanism available under the
legal authorities of the small MS4, require construction site operators to
practice erosion and sediment control and require construction site
operators to control waste and properly dispose of wastes, such as
discarded building materials, concrete truck washout, chemicals, litter,
and sanitary waste at the construction site that may cause adverse
impacts to water quality. This ordinance must apply, at a minimum, to
those sites described in Part V, Section BA.a
V.BA.c Review all site plans for those sites described in Part V, Section BA.a. for
potential water quality impacts, including erosion and sediment control,
control of other wastes, and any other impacts that must be examined
according to the requirements of the law or ordinance of Part VBA.b.
Before ground is broken at the construction site, the small MS4 operator
shall review the plans and verify (in written communication with the
construction site operator) that the BMPs for the site are appropriate
V.BA.d Develop and implement procedures for site inspection and enforcement of
control measures for those sites described in Part \I, Section BA.a
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AZPDES requires that a permittee's SWMP include the following information:
AZPDES requirement V.8.4.e
i. A description or citation of the established ordinance or other regulatory
mechanism used to prohibit erosion and ensure proper management of
waste on construction sites per Part V, Section 8.4.a. If the permittee needs
to develop this mechanism, describe the plan and schedule to do so;
ii. A description of the sanctions and enforcement mechanism(s) to ensure
compliance;
iii. A description of the procedures for site inspection and enforcement of
control measures, and procedures for site plan reviews;
IV. Procedures for receipt, acknowledgement and consideration of information
submitted by the public;
v. A list of measurable goals for the construction site stormwater runoff control
program;
vi. Dates, in terms of months and years, by which the permittee will achieve
specific measurable goals; and
vii. The name(s) and title(s) of the person(s) responsible for overseeing
construction site stormwater runoff control activities.
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7.2 Efforts to Date
The Town of Marana currently implements the following measures designed to reduce or
prevent stormwater pollution during construction activity:
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7.2.1
Building Permits
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a. Plan Review
Plans submitted for new construction or enlargement must provide sufficient details of
proposed structural features and electrical, plumbing, and mechanical installations to permit
evaluation of building adequacy by the Town Building Inspector.
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Once a permit is application is submitted, the building department circulates the application
throughout the appropriate departments for individual reviews. The planning department and
the engineering department conduct these additional reviews.
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The planning department reviews the building application and site plan to make sure that the
new proposal is consistent with zoning ordinances. The planning department will also
evaluate the plans to see if a native plant permit is necessary. Once this assessment is
completed, the engineering department will review the application and site plan.
The engineering department reviews plans for grading and floodplain. If, during the
engineering review, the department determines that a grading permit or a floodplain use
permit are necessary, the applicant will be required to submit for those permits as well. Once
the planning department and the engineering department has considered and accepted the
plans, the building department completes their review and issues permits to those plans
found to be acceptable.
Copies of building permit applications are included in Appendix D.
b. Trainina
The Town of Marana has a number of Plans Examiners that review the site plans for
building permit applications. The Plans Examiners that work for the town are required to
have six years of prior building inspection and plans examining experience with a municipal
building department. If the person is registered as an Architect or Engineer with the State of
Arizona that certification may substitute for four years of the experience. Building inspectors
must obtain, within 12 months of employment, a professional certification as a Plumbing,
Electrical, Mechanical, or Building Inspector. This certification must be approved by a Town
building official and maintained for the entire period of employment with the Town.
c. Construction Site Inspection/Enforcement
The number of inspections of a site depends largely on the type of activity taking place on
the site. There are a number of inspections that must be completed at different stages in the
building process once a building permit is issued. These inspections are conducted by the
Town of Marana Building Inspectors. Inspections are done in phases (preliminary,
intermediate, and finals) and early inspections must be passed before later inspections may
take place.
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7.2.2 Grading Permits
Requirements for Type I and Type II grading permits are contained in the Marana Land
Development Code, Title 19. For ease of reference, Title 19 is included in Appendix D of this
SWMP document.
a. Plan Review
The Engineering department, reviews all permit applications and makes a determination on
the type of grading permit to be issued, Type I or Type II. The Town of Marana currently
reviews and issues Type I grading permits in-house. The Type II grading permits -~e
reviewed by consultants or staff engineers, and when accepted, permits are issued by the
Town. Town staff and consultants review all SWPPPs and no grading permits will be is!'Oued
until a SWPPP is accepted.
b. Trai!!i..ng
The consultants reviewing Type II grading permits are registered Civil Engineers. The Type I
grading permit review is currently carried out by Town of Marana Engineering staff. The
primary training for Type I reviewers consists of daily interaction with the Town Engineer and
Consulting Engineers regarding proper application review. The current Type I reviewer has
been certified in sediment and erosion control by the organization 'Certified Professionals in
Erosion and Sediment Control'.
c. Construction Site Inspection/Enforcement
For Type II grading permits, casual surveillance is conducted daily on each construction site.
If there is a problem with the property or a violation has taken place, a report is completed
and submitted to the Town or to an agency acting on behalf of the Town. A stop work order
will be issued if sediment and erosion control are not present on site as outlined in the
SWPPP. Town construction inspectors will inspect Capital Improvement projects bi-weekly
to ensure compliance with the SWPPP, or to address issues that may trigger changes to the
SWPPP.
Copies of grading and floodplain use permit applications can be found in Appendix D.
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7.2.3 Ordinances
Marana Town Code
Marana's Town Code includes regulations that pertain to control of construction site
stormwater runoff. The relevant sections of Code are as follows:
Chapter 7: Buildina
Purpose (Section 7-1-1)
"The Marana building code shall have the following purposes:
1. Regulate the site preparation and construction, alteration, moving,
demolition, repair, use and occupancy of buildings, structures and building
service equipment within the jurisdiction...
4. Provide penalties for the violation of building codes."
Building Codes Adopted (Section 7-1-2)
A. "The Marana Building Code, codified in this chapter, adopts by reference
the 2000 International Building Code as amended, of the International Code
Council, together with the following code documents:
1. The 1997 Uniform Administrative Code, with amendments;
2. The 1994 Uniform Plumbing Code, with amendments;
3. The 2000 International Residential Code, with amendments;
4. The 2000 International Mechanical Code, with amendments;
5. The 2000 International Property Maintenance Code, with amendments;
6. The 1999 National Electric Code, with amendments;
7. The 1997 Uniform Fire Code, with amendments..."
B. "The Marana Building Code adopts by reference the following local
ordinances and codes...
1. 1996 Spa/Pool Code..."
Violation a civil infraction (Section 7-1-5)
"It shall be a civil infraction for any person, firm or corporation to violate any of
the provisions of this chapter. Civil infractions shall be enforced through the
hearing officer procedure provided by A.R.S. ~ 9-462.08. Penalties for civil
infractions shall not exceed the amount of the maximum fine for a class 2
misdemeanor. Each day a violation continues shall be considered a separate
offense. "
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Building Permits (Article 7-2)
A. "Any person, partnership, firm or corporation desiring to construct, erect or
move any residential building or mobile home or associated outbuilding
where such building or mobile home contains more than one hundred
twenty square feet and unattached to any structure, or desiring to enlarge
or substantially modify any residential building or mobile home where such
work will involve an area of more than one hundred twenty square feet and
unattached to any structure, shall first make application for a building permit
to the building department and shall not undertake any such construction
without first obtaining a building permit from the town."
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B. "Any person, partnership, firm or corporation desiring to construct any
additions to an existing structure regardless of the size of the addition or
structure shall first make application fc a building permit to the building
department and shall not commence any such construction, enlargemen'
mo' -''lent without first obtaining a building permit from the town."
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C. "AI' Jerson, partnership, firm or corporation desiring to erect, construct,
move or substantially modify an commercial, industrial, or quasi-public or
public building or structure shall first make application to the building
department for a separate building permit for each such building or
structure and shall not undertake any such construction, enlargement or
movement without first obtaining a building permit from the town."
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F. "When a building permit is issued for a structure on a lot that is not or
dedicated street or which is not served by a sewer system operated by
Pima)unty or the town, a statement to that effect Wili be placed on the
building permit before issuance."
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Town of Marana Land Development Code
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The Town of Marana's Land Development Code includes extensive regulations to control
construction site stormwater runoff. The relevant sections of Code are as follows:
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Title 5: Zonina
Zone D - Designated Flood Plain Zone (Reference 05.02.04)
C. "No construction or excavation that will alter the natural drainage pattern,
direction or rate of flow, or the carrying capacity of the Santa Cruz River
or the Brawley Wash can be performed unless previously approved by
the Town Council after recommendation from the Planning Commission."
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Application (Reference 05.06.02)
D. "The development capability report is a map and text summary of the
impact of the proposed development on site conditions existing on the
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land to be regulated by the specific plan that shall address the following
...hydrology and water resources..."
E1. "The map elements of the specific plan shall illustrate and identify
...Drainage plan..."
E2. "The text elements for the specific plan shall describe and contain
.. .Hydrology analysis.. . Standards for the phasing, construction, and
maintenance of sewage disposal, effluent use, storm water drainage,
solid waste disposal and public utilities; Standards for the conservation,
development or utilization of natural resources, including surface water,
soils, vegetation and wildlife..."
Resort and Recreation Zone (Reference 05.11.07)
P. "All uses shall be so located, constructed, and operated so as to not
constitute a public nuisance because of dust.. .or other public
nuisances."
Q.2.d "The design, scale and layout of the proposed development will
not. ..have a negative impact on the.. .health, safety, or welfare of
neighboring uses."
Title 6: Subdivisions
"The purpose and intent of this chapter is to.. .secure adequate provisions for water
supply, drainage, sanitary sewerage.. ."
Improvement Requirements (Reference 06.03.02)
A. ''The required streets shall be graded and paved and all required drainage
improvements shall be installed..." .
B. "The Town requires that off-site and on-site sewer lines shall be installed in
such a way that each lot can be served there from.. ."
E. ''The required off-site and on-site drainage facilities shall be installed..."
K. "The subdivision layout shall make adequate provision for natural drainage
channels and floodways. Added surface water produced by the subdivision's
development, particularly excess runoff created by paving, shall be properly
disposed of within the subdivision or shall be drained into natural or man-
made channels in a manner that will minimize the exposure to flood hazard,
and will minimize erosion of soil. ..All other environmental hazards must be
eliminated or adequately restricted as directed by the Town."
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Title 17: Environmental Resource Preservation. Native Plant Protection,
Landscape Reauirements
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Landscape Plan Requirement (Section 17-3-3)
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"An approved landscape plan.. .is required prior to approval of the development plan,
tentative plat and final plat or issuance of building permits."
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Landscape Plan Content and Standards (Section 17-3-6)
I. "Any part of a development site which has been disturbed and is not
required for buildings, structures, private residential yards, loading and
vehicular access ways, streets, paved parking and utility areas,
pedestrian walks and hard-surface activity areas shall be landscaped."
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Title 19: Standards for Gradina and Related Site Work
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"The purpose of this Title is to protect the public health, safety, general welfare, and
aesthetics by regu lating grading and related site work..."
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Purpose and Interpretation (Reference 19.010)
B.3. "In all projects, measures shall be taken to:
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a. Ensure that graded hillside, slopes, or other areas subject to erosion are
stabilized;
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b. Reduce the erosion effects of stormwater discharge, preserve the
floodway-carrying capacity of natural or constructed waterways by
limiting soil loss, and protect drainways from siltation;
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c. Minimize dust pollution and surface water drainage from graded areas
during grading and development; and
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d. Ensure that development activity is designated and implemented to
minimize adverse impacts and include appropriate restorative
measures."
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General Grading and Related Site Work Performance Standards (Reference
19.040)
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C. "All exposed cut or fill slopes shall be revegetated or stabilized in
accordance with the approved grading plan."
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D. "Terracing to control surface drainage and debris on cut of fill slopes
may be required."
E. "Fill shall be compacted and soil-tested in accordance with Town of
Marana standards."
H.1.a. "Erosion control shall be constructed and maintained to prevent
erosion of slopes, and cleared, brushed, grubbed, or graded areas in
accordance with the approved grading plan and Town of Marana
standards. "
H.1.c. "Erosion control devices to prevent erosion or sediment deposition on
off-site property may be required."
H.1.e.(2). "Approved surface drainage interceptors shall be provided at the
top of cut and fill slopes where there is runoff and erosion potentiaL"
1.2. "The transportation of earth material on public right-of-way shall be in a
manner that minimizes blowing soil and other hazards."
K.1. "No vehicles shall be driven over 'natural open space areas', as
designated on the approved grading plan."
K.2. "Points-of-entry to the site during construction shall be only as
designated on the approved grading plan."
K.3. "For Type 2 permits, access roads to the site during construction shall
be only as designated on the approved grading plan."
L.1. "During construction, and until revegetation or stabilization has taken
place, dust shall be minimized through application of approved dust
controls as may be required by Town of Marana staff."
L.2. "Public rights-of-way, sidewalks, and other improvements shall be
maintained during construction in a neat and clean condition, free of
loose soil, construction debris, and trash."
L.3. "Debris, fill, or equipment shall not be stored within a public right-of-way
without the written approval of the Town of Marana."
LA. "Cut or fill material in excess of that allowed by the permit shall be
disposed of in an approved manner."
M. "In order to minimize erosion and sedimentation in the run off from the
Tortolita mountains, native vegetation shall not be removed from that
part of the Town of Marana East of 1-10 except where the Town
Engineer has approved the methods to control erosion, sedimentation,
flow and related factors..."
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Submittal and Procedures: Type 1 (Reference 19.050)
C. "A written grading statement shall be submitted with an application for a
permit. The Statement shall include, where applicable:
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1. A description of stabilization, erosion, and drainage control
measures;
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2. The off-site disposal location and estimated auantity of earth material
and vegetation to be removed from the site 'ing construction;
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4. A description of the dust control methor to be used during
construction and until revegetation or ~ ilizallon has been
completed."
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1.1. "If drainage problems, flood hazards, or other pOlclntial hazards become
known that were not considered at the time the permit was issued, the
Town of Marana may require that engi' "erinQ modifications be
submitted in a report and that the design beifie<.
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Submittal and Procedures: Type 2 (Reference 19.060)
B. "Grading plan requirements...
4. A description of the mitigation methods... to be used during grading
and until revegetation or stabilization has been completed...
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6. The extent and manner of preserv! , relocating, clearing and
disposing of vegetation.
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7. The final ground cover, revegetation (if any), erosion control and
proposed methods for cut or fill stabilization...
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9. Where drainage improvement plans have not been submitted
separately of where interim drainage conditions exist because of
project phasing, plans for:
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a. Drainage or other protective devices to be constructed as part of
the grading;
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b. The drainage area and estimated runoff of the area served by the
drains."
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G.2. "Preliminary grading assurances...
c. Eliminate potential hazardous conditions; or
(1) Mitigate the effect of dust, drainage, erosion, visual scars or
hazardous conditions, in accordance with the apploved design."
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J.1. "If drainage problems, flood hazards, or other potential hazards become
known that were not considered at the time the permit was issued, the
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Town of. Marana may require that engineering modifications be
submitted in a report and that the design be modified."
Inspection and Performance Defaults (Reference 19.070)
A.1. "All construction which requires a permit shall be inspected by the Town
of Marana in accordance with the permit."
A.2. "If the Town of Marana finds site conditions are not... [ as] stated in the
approved permit conditions, the Town of Marana may order work
authorized. ..[by] the permit to stop until a revised grading plan has been
approved. "
B.1. "Upon approval by the Town of Marana, the owner may retain a Civil
Engineer, registered in the State of Arizona, to:
a. Perform the required construction inspection.
b. Certify upon completion, that the construction has been
performed and completed in accordance with the permit
conditions, the approved plans and specifications, and with
applicable Town of Marana standards."
B.6. "The Town of Marana may periodically inspect the work and will monitor
the progress. The Town of Marana will conduct a final inspection upon
receiving notice of completion and will release all parties from the permit
only after all provisions of the permit and the agreement have been met.
B.7. "The owner, in receiving a permit for construction, shall guarantee all
work accomplished under the permit for a period of at least one year
following the acceptance of the project and release of the permit."
C.4. "The soils report and certification of substantial conformance shall be
submitted to the building official prior to issuance of a building permit."
0.2. "Where the conditions of a permit include the establishment of
vegetation or other final site work that extends beyond the expiration of
the permit, the Town of Marana shall make a post-construction
inspection within six months of permit expiration or as required by the
permit."
E.1. "Maintenance of approved landscaping and revegetated areas shall
consist of regular watering, pruning, fertilizing, clearing of debris and
weeds, the removal and replacement of dead plants, and the repair and
replacement of irrigation systems and architectural features."
E.2. "The final approval of any subdivision plat or development plan that
includes an approved final landscaping plan shall require covenants or
assurances which:
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a. Ensure the continued maintenance of required landscaping,
buffering and associated irrigation systems; and
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b. Assign the responsibility of maintenance to the property owner of
agent, a homeowner's association or other liable entity."
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F. "Town personnel, qualified in landscape architectural review will
periodically spot-inspect landscape installations for compliance with this
Title and approved landscape plans."
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Enforcement and Penalties (Reference 19.080)
B. "When ever the Town of Marana determines that grading does not
comply with this Title or the permit conditions, or that the soil or other
conditions are not as stated on the permit, the Town of Marana may
order the work stopped by written notice served on any person engaged
in doing or causing such work to be done."
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C.1. "Unless exempted by this Title... failure to obtain a permit prior to
commencement of grading shall be a violation of this code."
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C.2. "A violation may result in issuance of a stop-work order, and penalties
may be assessed in accordance with the Town of Marana Development
Code. A violation of this Title shall also constitute a Class 1
misdemeanor. Payment of any fines or penalties shall not relieve any
person from otherwise complying with the requirements of this Title.
Each and every day that a violation of this Title exists shall be deemed
to be a separate offense."
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Title 21 : Flood Plain Erosion Hazard Manaaement Code
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Subdivision and Development Requirements (Reference 21.11)
B.1. "All tentative plats and development plans submitted shall show location
by survey, or photographic methods, of streams, watercourses, canals,
irrigation laterals, private ditches, culverts, lakes and other water
features, including those areas subject to flooding or erosion. The
plats/plans shall also include the direction of any flow and drainage
area, as well as water surface elevations and the limits of inundation for
the base flood if such a flood has a peak flow rate equal to or greater
than 100 cfs."
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B.2. "All tentative plats and development plans shall show proposed grading
and improvements for areas which are subject to flooding or which have
extremely poor drainage and a description and location of all facilities
proposed to be used to alleviate flooding or drainage problems, both on
the proposed subdivision or development, and downstream and
upstream of any watercourse affected by the subdivision or
development, whether they are within or outsides the boundaries of the
subdivision or development."
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B. "All development plans and tentative plats must be accompanied by
conceptual grading plans and conceptual drainage improvement plans
as necessary to demonstrate:
1. The methods for flood proofing and/or drainage control for the
development including sufficient lot grading information to
demonstrate adequate finished pad elevations and/or drainage
slopes to protect building foundations.
2. That improvements are compatible with the existing upstream and
downstream drainage conditions and that any proposed grading
and/or grade change will not have an adverse impact on
surrounding property.
3. The methods of erosion and sediment control.
4. The methods of mitigating increased urban peak and volumetric
flood water runoff or discharge on downstream properties created
as a result of the development."
D. "All final plats and development plans shall indicate both the size of
drainage areas and their respective 1 DO-year peak discharges which
exceed 100 cfs, as well as the limits of the regulatory floodplains,
erosion hazard boundaries and the limits of the federally established
floodways, if contained on a Flood Boundary Floodway Map, and be
delineated in a surveyable manner and certified by a Registered
Professional Civil Engineer where any of the [sic] portion of the land
being subdivided contains areas within the regulatory floodplain. Where
floodplains are delineated the discharge value used to establish the
floodplain will be clearly shown and, for minor watercourses, the
drainage area will also be shown."
E. [page 230] "Along reaches of streams or watercourses where hazards
eroding banks and/or channel meandering are considered by the Town
Floodplain Administrator to be severe, special engineering studies shall
be made by the property owner or developer and requirements for
setbacks from banks of streams or watercourses and/or other protection
measures shall be established in accordance with findings that are
concurred with by the Town Floodplain Administrator."
Building Setback Requirements and Erosion Hazard Areas
(Reference 21.12)
A.1. [page 231] "Along the following major natural watercourses where no
unusual conditions exist, a minimum setback measured from the
primary channel of 1 DO-year floodway, where the channel does not
contain the 1 DO-year discharge, shall be provided at the time of the
development unless an engineering analysis which establishes safe
limits is performed by a registered Professional Civil Engineer and is
approved by the Town Floodplain Administrator.
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a. Santa Cruz River requires a setback of five hundred (500) feet.
b. All other major washes with 100-year discharges greater than
10,000 cfs shall require a setback of two-hundred and fifty (250)
feet.
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c. Major washes with 100-year discharges of 10,000 cfs or less, but
more than 2,000 cfs, shall require a setback of one hundred (100)
feet
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A. [page 232] "Along major water courses where unusual conditions exist,
building setbacks shall be established on a case-by-case basis by the
Town Floodplain Administrator, unless an engineering study which
establishes safe limits is performed by a Registered Professional Civil
Engineer and is approved by the Town Engineer."
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B. For minor washes with a 100-year peak discharge of 2,000 cfs or less,
the following building setback shall be required where bank protection is
not provided.
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1. Along minor washes where no unusual conditions exist, a minimum
building setback of fifty (50) feet measured from the nearest primary
channel bank shall be provided at the time of development.
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2. Along minor washes where unusual conditions exist, building
setbacks shall be established on a case-by-case basis by the Town
Floodplain Administrator, unless an engineering study which
establishes safe limits is performed by a Registered Professional Civil
Engineer and is approved by the Town Engineer."
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Detention/Retention Systems (Reference 21.14)
A 1. "Balanced and critical drainage basins which have been identified by the
County Engineer as unsuitable for added development because of the
high probability of increased flooding, or flooding of existing
improvements or property not previously flooded, or pounding (sic) of
flood water, may be developed further only upon the incorporation of
adequate detention/retention systems or flood control facilities as
reviewed and approved by the Town Engineer. Drainage basins that have
not been previously identified as unsuitable for additional urban
development but upon any study are so identified shall be subject to the
provisions of this Section. These detention or retention systems or flood
control facilities shall be incorporated into any and all future basin
development proposals regardless of size or land use density."
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A2. "Structural flood control measures may be proposed in conjunction with or
in place of detention/retention systems if it can be clearly demonstrated
that such measures will not alter the water and sediment equilibrium of
the affected watercourse and will mitigate environmental impacts.
Appropriate structural flood control measures, such as channelization to a
logical conclusion downstream of the proposed development and/or
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improvements to existing off-site flood control systems within the effected
drainage or stream reach, shall be completed in accordance with plans
reviewed and approved by the Town Engineer."
Sediment and Erosion Control (Reference 21. 15)
VI. "Any grading and alteration of a watershed tributary to any
watercourse regulated by this Code shall be controlled to minimize the
loss of soil through erosion from rainfall or storm water flowage.
Methods to control erosion and sedimentation must be demonstrated
to the satisfaction of the Town Engineer prior to the granting of a
Floodplain Use Permit for any work in any flood hazard zone or
floodplain. Both temporary and permanent measures for sediment and
erosion control must be clearly delineated on plans or other written
documents prior top receiving a Floodplain Use Permit."
vii. "The Town Engineer may require appropriate soil investigation
reports for the purpose or (sic) determining the erosive properties of
areas or lands to be graded or disturbed which may create sediment
deposition or erosion in any watershed regulated by this Code."
Title 22: Off-Street Parkina and Loadina
Parking Areas - Surfacing Requirements (Reference 22.090)
"Any off-street parking areas shall be surfaced in accordance with the
specifications set forth by the town standards, so as to be a durable and
dustless surface and shall be graded and drained so as to dispose of all
surface water accumulated in the area..."
7.3 Action Plan for Construction Site Stormwater Runoff Control
The Town of Marana's action plan for construction site stormwater runoff control is as
follows. The format is structured according to the guidelines provided by ADEQ.
7.3.1 Construction Site Stormwater Runoff Control Ordinance
V.B.4.e.i
Include in the SWMP a description or citation of the established
ordinance or other regulatory mechanism used to prohibit erosion and
ensure proper management of waste on construction sites per Part V,
Section B.4.a. If the permittee needs to develop this mechanism,
describe the plan and schedule to do so.
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The Town of Marana's Land Development Code and Town Code include extensive
regulation of construction site operations. These regulations, as cited above, control
numerous aspects of the construction process including erosion and sedimentation control,
treatment ,..t waste on construction sites, and impacts of construction on natural drainages.
Marana undergoes an extensive review of each building and grading application submitted
to the Town. Permits are required, by ordinance, for any unattached building greater than
120 square feet, any building improvements, most developments %-acre in size of larger
(see Section 7.2 for details), new pavement of more than 3,000 ft2, stockpiling of fill, clearing
of an area %-acre or larger, and any grading.
This application process requires that permittees develop and submit information on natural
drainage flow on their property, any drainage improvements, proximity to the 100-year
floodplain, total area of grading, grading plan including proposed cut and fill slopes and
grade breaks, sewer or septic tank connections, and dust control measures. This
information ensures that construction activities are developed in accordance with standards
that minimize runoff from the properties. Permittees must also describe all mitigation
methods to be used during grading until such point in time that revegetation and stabilization
has been completed. (Requirements and permit applications are contained in Appendix D).
During the construction process, permittees must take steps to: stabilize all slopes or areas
subject to erosion, reduce sedimentation runoff and erosion effects of stormwater discharge,
limit soil loss so as to preserve the floodway-carrying capacity of any natural or constructed
waterway, minimize dust pollution, minimize surface water drainage from graded areas, and
minimize any other adverse impacts from the grading and development (Reference 19.010).
The Town strictly regulates all grading activities by requiring that: all exposed slopes be
revegetated and stabilized; any fill be compacted, sediment and erosion control measures
be constructed and maintained so as to prevent sediment runoff and erosion; any transport
of earth material be done in a manner that minimizes dispersal or dumping of material;
points-of-entry and access roads on the site be restricted; dust control be implemented,
public rights-of-way and sidewalks be maintained free of loose soil, debris, and trash; and
excess earth material be disposed of in an appropriate manner. The Town may also require
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permittees to create terraces for the purpose of controlling surface drainage and debris,
implement erosion control devices to prevent erosion or sediment deposition off-site, and
provide surface drainage interceptors on cut and fill slopes where there is runoff and erosion
potential (Reference 19.040).
Any grading or construction activities that require a permit are also subject to inspection
during the process. A final inspection will also be conducted once all work is done to ensure
that grading and/or construction was done according to plan. If conditions in the permit
require revegetation or any other measures whose life extends beyond the expiration of the
permit, then the Town may conduct a post-construction inspection at some point after the
permit has expired. The owner of the property must guarantee any work done under a
development or grading permit for a period of at least one year after the expiration of the
permit and acceptance of the project.
During the permit period, the Town of Marana will review existing Code and determine if any
additional provisions are necessary. The Town began developing interim policies for
additional control of construction site stormwater runoff in August/September 2005 to take
effect as soon as documents are finalized, and will begin development of a stormwater
ordinance upon acceptance of this Storm Water Management Plan by Town Council.
7.3.2 Sanctions and Enforcement Mechanisms
V.B.4.e.ii
Include in the SWMP a description of the sanctions and enforcement
mechanism(s) to ensure compliance.
Currently, violation of any provision of the Land Development and Marana Town Code
constitutes a Class 1 misdemeanor. Non-compliance is subject to the issuance of a stop-
work order and/or fines.
Beyond enforcement policies for existing Town of Marana ordinances, consideration will be
given to the development of a plan for further enforcement actions. Any new enforcement
policy, if it is necessary, may include verbal or written warnings, administrative actions, fines,
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costecovery, and/or legal action. Town subdivision engineering staff will issue a stop work
order until deficiencies with SWPPP implementation are corrected.
7.3.3 Site Inspection and Plan Review
V.BA.e.iii
Include in the SWMP a description of the procedures for site
inspection and enforcement of control measures, and procedures for
site plan reviews.
7.3.3.1
Site Inspection/Enforcement
Buildina Site Inspection/Enforcement
The number of inspections of a site depends largely on the type of activity taking place on
the site. There are a number of inspections that must be completed at different stages in the
building process once a building permit is issued. These inspections are conducted by the
Town of Marana Building Inspectors. Inspections are done in phases \preliminary,
intermediate, and finals) and early inspections must be passed before later inspections may
take place.
Construction Site Inspection/Enforcement
For Type II grading permits, casual surveillance is conducted daily on each construction site.
If there is a problem with the property or a violation has taken place, a report is completed
and submitted to the Town or to an agency acting on behalf of the Town.
During the permit period, staff will develop a site inspection procedure that explicitly covers
stormwater management concerns, document criteria used to set inspection priorities, and
describe the frequency of inspection for construction sites.
Each site will be inspected for stormwater compliance at least once during the construction
period. If necessary, building/site inspectors will be trained on proper erosion and sediment
controls and requirements by the stormwater management program coordinators.
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7.3.3.2
Plan Review
Buildina Plans
Plans submitted for new construction or enlargement must provide sufficient details of
proposed structural features and electrical, plumbing, and mechanical installations to permit
evaluation of building adequacy by the Town Building Inspector.
Once a permit is application is submitted, the building department circulates the application
throughout the appropriate departments for individual reviews. At present, these additional
reviews are conducted by the planning department and the engineering department.
The planning department reviews the building application and site plan to make sure that the
new proposal is consistent with zoning ordinances. The planning department will also
evaluate the plans to see if a native plant permit is necessary. Once this assessment is
completed, the engineering department will review the application and site plan.
The engineering department reviews plans for grading and floodplain. If, during the
engineering review, the department determines that a grading permit or a floodplain use
permit are necessary, the applicant will be required to submit for those permits as well. Once
the planning department and the engineering department has considered and accepted the
plans, the building department completes their review and issues permits to those plans
found to be acceptable.
Gradina Plans
Once a permit application is received by the engineering department, they will determine if
the submittal needs to be issued a Type I grading permit or a Type II grading permit. The
Town of Marana currently reviews and issues Type I grading permits in-house. The Type II
grading permits are reviewed by consultants and, once accepted, are issued permits by the
Town.
Type I plans reviews, in part, consist of ensuring that: the drainage of the property is not
substantially altered, whether drainage improvements are planned that will adequately
control stormwater runoff, that there is sufficient slope protection on any cut and fill areas,
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and that no construction activity occurs within a wash or floodplain without a floodplain use
permit. _
7.3.4 Public Reporting Procedures
V.BA.e.iv
Include in the SWMP procedures for receipt, acknowledgement and
consideration of information submitted by the public.
The observations of community members are often an important source of information
regarding construction site runoff. As outlined in a previous section on public
involvement/participation, the Town will develop and implement a procedure that enables
the public to report suspect construction site runoff. Reported sites will be subject to the
inspections consistent with current construction site inspection procedures.
This procedure will include, at a minimum, the listing of a phone number for "construction-
related citizen concern reports" on the Town of Marana website, in any brochures or other
public outreach materials, and in office lobbies. Calls to this number will be directed to the
SWMP contact person who will keep a written log of all citizen reports, including date and
time of call, location of the construction site, and nature of the concern. Citizen concern
report information will be provided to local construction inspectors by the end of the day. The
goal is to have inspectors follow up on each citizen concern report within three working
days.
7.3.5 Measurable Goals
V.BA.e.v
Include in the SWMP a list of measurable goals for the construction site
stormwater runoff control program.
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The measurable goals for reduction or elimination of construction site runoff can be found in
Table Four: Construction Site Stormwater Runoff Control Measures and Milestones (found -
on page 7-26).
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The Town of Marana will include the following information in the annual MS4 compliance
report:
1. Ordinance
a. Date and description of any modification made to current Town of Marana Land
Development Code to meet construction site runoff control requirements
2. Plan Review
a. Number of plan reviews conducted per year
3. Site Inspection
a. Staff responsible for conducting inspections
b. Number of grading permits issued requiring stormwater construction permit
(SWPPP) inspections.
c. Number and type of enforcement actions taken, if any
4. Public Reports
a. Number of reports received from members of the public
7.3.6 Implementation Schedule
V.B.4.e.vi Include in the SWMP dates, in terms of months and years, by which
the permittee will achieve specific measurable goals.
The dates by which each measurable goal will be achieved are specified in Table Four:
Construction Site Stormwater Runoff Control Measures and Milestones (below).
7.3.7 Staff
V.B.4.e.vii Include in the SWMP the name(s) and title(s) of the person(s)
responsible for overseeing construction site stormwater runoff
control activities.
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A stal ,~mber will draft any necessary ordinance and/or develop enforcement strategies.
Town personnel will review and Town Council will adopt ordinances as necessary to control
construction site stormwater runoff. A staff member will develop Inspection procedures and
forms. A staff member will manage and determine appropriate response to public reporting.
7.4 Measurable Goals and Implementation
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The BMPs and measurable goals by which they will be implemented, are identified in the
following Table. The table includes the implementation schedule and references to the _
relevant ADEQ requirements.
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T ,-';Jle Four: Construction Site StormWC,ler Runoff Control Measures
and Milestones
Reference
BMP
V.BA.a
V.BA.b
V.BA.e
1. Staff will
develop, if
necessary, an
ordinance or
other
regulatory
mechanism to
control
construction
site
stormwater
runoff.
V.BA.a
V.B.4.c
V.BA.e
2. Staff will
review all site
plans for
potential
Measurable Goal
a. Identify whether current Town Code
adequately addresses construction
site stormwater runoff control
b. Outline any necessary additions to
existing Town Code if applicable.
c. Draft new Code provisions.
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Target
Date
a. Dec.
2006
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b. Feb.
2007
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d. Submit draft Code for legal and c. July
technical review. 2007
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e. Submit Code for approval by Town d-. Sept.
Council. 2007
f. When new provisions are approved,
implementation will begin. Ordinance
approval and implementation will be
done in accordance with the public
notice reqUirements of the State of "-
Arizona (A.R.S. 39.204 and 9.812).
a. Modify existing review process based
on any new ordinances or procedural
requirements adopted for compliance
with the AZPDES.
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e. Oct.
2007
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a. Begin
Sept.
2004,
ongoinQ
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V.B.4.a
V.B.4.d
V.B.4.e
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water quality
impacts.
3. Staff will
inspect
construction
sites for
compliance
with runoff
control
requirements.
b. Require all construction projects
disturbing one acre or more to submit
a copy of their NOI (and verify
authorization number online through
ADEQ website or obtain ADEQ's
authorization letter from applicant),
SWPPP, and/or NOT.
c. Review all site plans for projects
disturbing one or more acres for
stormwater runoff potential and
review storm water pollution
prevention plans (SWPPPs) prior to
approving grading or building
permits.
a. Modify existing inspection process
based on any new ordinances or
procedural requirements adopted for
compliance with the AZPDES.
b. Sept.
2004
c. Begin
Mar.
2006,
ongoing
a. Begin
Feb.
2006,
ongoing
b. Determine criteria for setting inspection b. Sept.
priorities. 2006
c Verify inspection compliance for all
construction sites by making report
submittal a criteria of grading permit
issuance.
c. Beg.
Oct. 2006,
ongoing
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8. POST-CONSTRUCTION STORMWATER
MANAGEMENT IN NEW DEVELOPMENT AND
REDEVELOPMENT
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Land development significantly impacts the quality of surface waters through the
alterations of the natural landscape, especially through the increase in impervious
surface. This land use change increases not only the quantity of stormwater runoff but
also the quality of the stormwater. Increased runoff volumes can cause downstream
flooding, channel and bank erosion, sedimentation, and reduced groundwater recharge.
The pollutants carried by these larger storm water flows can include soil sediments, oils,
grease, litter, and other toxic substances that collect on paved or otherwise impervious
surfaces.
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8.1 AZPDES Requirements and Guidelines
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The Arizona Pollutant Discharge Elimination System contains requirements for regulated
MS4s to ensure post-construction stormwater runoff control in new development and
redevelopment with the following minimum control measures:
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V.B.5.a
Develop, implement, and enforce a program to address stormwater
runoff from new development and redevelopment projects that disturb
one acre or more, including projects less than one acre that are part of
a larger common plan of development and discharge to the small
MS4.
Develop and implement strategies that include a combination of
structural and/or non-structural BMPs appropriate for the community
Adopt an ordinance or establish another regulatory mechanism to
address post-construction runoff from new development or
redevelopment projects to the extent allowable under the legal
authorities of the small MS4
Ensure adequate long-term operation and maintenance of BMPs
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V.B.5.e
i. A description of the management practices to reduce post-construction
runoff from new development and redevelopment projects within the MS4;
address any specific priority areas and tailor to the community;
II. A description or citation of the established ordinance or other regulatory
mechanism used to address post-construction runoff control. If the
permittee needs to develop the required regulatory mechanism, describe
the plan and schedule to do so;
iii. A description of the procedures to ensure compliance with local
requirements;
iv. A description of the education program for developers and the public
about project designs that minimize water quality impacts;
v. An identification of the measurable goals for the post-construction runoff
control program;
vi. Dates, in terms of months and years, by which the permittee will achieve
specific measurable goals; and
vii. The name(s) and title(s) of the person(s) responsible for the development,
implementation, and enforcement of post-construction stormwater
8.2 Efforts to Date
Gradinq Plan Review
In addition to the Grading permit process as described in Section 7.2, the Town of
Marana has a checklist for the Release of Assurances. This checklist consists of items
that must be submitted, waived, or otherwise addressed by a permittee prior to release
of assurance (as of October 2005, the checklist is being updated).
The Town requires the permittee to provide proof of formal acceptance/approval of
sewer line and manhole installation from Pima County Wastewater Development
Services, a copy of site dust control permit obtained from Pima County Department of
Environmental Quality, a Landscape Plan, a detailed agreement for maintenance of
landscaping, and a one year guarantee of work. These requirements are expected to
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result in a beneficial effect on the quality of stormwater. If sedimentation or erosion
problems occur associated with the permitted work, the Town has one year to address
the issue and require the owner/operator to correct the problem at the owner's expense.
Erosion due to unstable banks, trash or debris left after construction, and faulty
landscaping plans allowing undesired vegetation to enter the stormwater system are a
few of the problems that may be addressed after construction is completed.
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Site Inspection/Enforcement
Before a subdivision or building is accepted by the Town, a permittee is required to
schedule a final building inspection and a final grading inspection. This provides Town
inspectors the opportunity to evaluate the finished site for compliance with the grading
plan and to ensure that no other drainage issues have developed since grading began.
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Detention/Retention Basin Maintenance
Any detention or retention basins or dry wells required for post-construction stormwater
runoff control from a development must be maintained by the homeowner's association
(HOA) once the developer submits his NOT. The Town of Marana will respond to citizen
concern reports regarding these control features by inspecting the site and notifying the
responsible party of their obligation to maintain the feature.
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Town of Marana Land Development Code
The Town of Marana's Land Development Code includes extensive regulations to
control post-construction site stormwater runoff. The relevant sections of Code are as
follows:
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Title 5: Zonina
Specific Plan Report (Reference 05.06.08)
"The owner or agent for each adapted Specific Plan shall annually, within
30 days of the anniversary of the specific plan approval, submit a written
report to the Town of Marana including, but not limited to, the past year's
development activity, utility, sewer, water, drainage and street improvement
activities.. .and estimates for the upcoming year in the above categories."
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Title 19: Standards for Gradina and Related Site Work
"The purpose of this Title is to protect the public health, safety, general welfare,
and aesthetics by regulating grading and related site work..."
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Submittal and Procedures: Type 1 (Reference 19.050)
1.1. "If drainage problems, flood hazards, or other potential hazards
become known that were not considered at the time the permit
was issued, the Town of Marana may require that engineering
modifications be submitted in a report and that the design be
modified."
"'i"'"
Submittal and Procedures: Type 2 (Reference 19.060)
J.1. "If drainage problems, flood hazards, or other potential hazards
become known that were not considered at the time the permit
was issued, the Town of Marana may require that engineering
modifications be submitted in a report and that the design be
modified."
8.3 Action Plan for Post-Construction Site Stormwater Runoff Control
The Town of Marana's action plan for post-construction site stormwater runoff control is
as follows. The format is structured according to the guidelines provided by ADEQ.
8.3.1 Post-Construction Ru nott Management Practices
V.B.5.e.i
Include in the SWMP a description of the management practices to
reduce post-construction runoff from new development and
redevelopment projects within the MS4; address any specific priority
areas and tailor to the community
The Town of Marana requires any company seeking a grading permit to submit a site
plan identifying specific post-construction runoff controls. The post-construction runoff
BMPs must be consistent with the accepted standards established in the Pima County
Stormwater Detention/Retention Manual (PC SWDR) contained in Appendix F, and the
2000 Revised Development Requirements for Drainage in Northern Marana contained in
Appendix G. The PC SWDR Manual contains technical standards for post-construction
BMPs and the operation and maintenance requirements for those BMPs.
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At the point in time at which a Homeowner's Association (HOA) has been designated for
a subdivision, maintenance of post-construction runoff control features transfers from the
developer to the HOA. During the permit period, the Town of Marana will develop an
informational presentation and brochure that will be offered or mailed to all HOAs within
the Town boundaries notifying them of their responsibility to maintain such features and
recommending practices and methods for the process, recordkeeping required, and
Town of Marana reporting procedures.
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During the permit period, the Town will evaluate the existing plan review process to
identify opportunities to integrate further post-construction controls. If water quality
impairments are identified by ADEQ, EPA, or other jurisdictions, the post-construction
plan will be revised to include strategies and BMPs targeted to reducing relevant
pollutants.
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8.3.2 Post-Construction Runoff Control Ordinance
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V.B.5.e.ii
Include in the SWMP a description or citation of the established
ordinance or other regulatory mechanism used to address post-
construction runoff control. If the permittee needs to develop the
required regulatory mechanism, describe the plan and schedule to do
so.
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The Town of Marana's Land Development Code includes controls over post-construction
stormwater runoff in the form of a grading and building permit requirement. These
permits require that post-construction stormwater controls be planned and approval prior
to the beginning of construction. The Town will inspect for final stabilization and removal
of temporary sediment and erosion BMPs prior to approving final release for NOT filing.
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8.3.3 Enforcement Procedures
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V.B.5.e.iii
Include in the SWMP a description of the procedures to ensure
compliance with local requirements.
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Currently, violation of any provision of the Land Development and Marana Town Code
constitutes a Class 1 misdemeanor. Non-compliance is subject to the issuance of a stop-
work order and/or fines.
Beyond enforcement policies for existing Town of Marana ordinances, consideration will
be given to the development of a plan for further enforcement actions. Any new
enforcement policy, if it is necessary, may include verbal or written warnings,
administrative actions, fines, cost recovery, and/or legal action.
8.3.4 Education Program
V.B.5.e.iv Include in the SWMP a description of the education program for
developers and the public about project designs that minimize water
quality impacts.
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The amount of soil and other pollutants carried by stormwater runoff from developed
areas is, in part, a function of the project design. A variety of design elements exist that
will minimize the impacts on water quality.
For larger scale projects, the Town can encourage the use of better design standards by
educating developers about those designs that best work to reduce stormwater pollution.
Information regarding these best designs will be collected and a fact sheet developed.
This fact sheet will be distributed to all development permit applicants at the time of their
initial "pre-app" consultation with the Town.
At a smaller scale, decisions of individual homeowners can also impact stormwater
quality. As part of the stormwater education and outreach campaign, Marana will
distribute brochures to residents (see Section 4.3). One part of these brochures will be
information on design of landscaping, irrigation, and other outdoor projects to minimize
stormwater pollution impacts.
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8.3.5 Measurable Goals
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V.B.5.e. v
Include in the SWMP an identification of the measurable goals for the
post-construction runoff control program.
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The measurable goals k each post-construction stormwater management control can
'"\e found in Table Five: Post-Construction Stormwater Management in New
Development and Redevelopment Measures and Milestones (found on page 8-8),
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8.3.6 Implementation Schedule
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V.B.5.e. vi
Include in the SWMP dates, in terms of months and years, by which the
'9rmittee will achieve specific measurable goals.
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The dates by which each measurable goal will be achieved are specified in Table Five:
Post-Construction Stormwater Management in New Development and Redevelopment
Measures and Milestones (found on page 8-8).
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8.3.7 Staff
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V.B.5.e. vii Include in the SWMP the name(s) and title(s) of the person(s)
responsible for the development, implementation, and enforcement of
post-construction stormwater management.
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Town of Marana staff members will draft any necessary ordinance or enforcement
policy. The Tow Manager and Town Council will review and adopt as necessary. Stan
members will develop inspection procedures and forms. Town personnel will manage
oublic education.
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8.4 Measurable Goals and Implementation
The BMPs, and measurable goals by which they will be implemented, are outlined in the
following Table. Also included is the implementation schedule and references to the
relevant ADEQ requirements.
8.4.1 Table Five: Post-Construction Stormwater Management
Measures and Milestones
Reference
V.B.5.a
V.B.5.b
V.B.5.e
~T.._
V.B.5.a
V.B.5.c
V.B.5.e
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V.B.5.a
V.B.5.d
V.B.5.e
BMP
1. Staff will continue to
require grading plans
be consistent with any
relevant local
stormwater control
auidelines.
2. Staff will develop, if
necessary, an
ordinance or other
regulatory mechanism
to address post-
construction
stormwater
management.
3. Staff will notify the
parties that are
responsible for the
maintenance of
retention basins or
other stormwater
control features.
Measurable Goal
Target Date
a. Review all grading permit applications a. Ongoing
according to the Pima County
Stormwater Detention/ Retention
Manual and the 2000 Revised
Development Requirements for
Drainaae in Northern Marana.
a. Identify whether current Town Code a. Dec. 2006
adequately addresses post-
construction stormwater management.
b. Outline any necessary additions to b. Feb. 2007
existing Town Code if applicable.
c. Draft new Code provisions.
c. July 2007
d. Submit draft Code for legal and d. Sept. 2007
technical review.
e. Submit Code for approval by Town e. Oct. 2007
Council.
f. Once new provisions are approved, f. Nov. 2007
begin implementing them. Ordinance
approval and implementation will be
done in accordance with the public
notice requirements of the State of
Arizona (A.R.S. 39.204 and 9.812).
a. Identify and inventory existing post- a. Oct/Nov
construction stormwater control 2005, ongoing
features.
b. Determine the party responsible for
maintenance of each feature. For the b. Dec 2005,
most part, this will be the homeowner's onqoinq
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V.B.5.a
V.B.5.d
V.B.5.e
4. Staff will respond to
citizen reports
regarding Improper or
inadequate stormwater
control feature
maintenance and
related drainage
issues.
association (HOA) for the development
in which the feature exists.
c. Notify each responsible party annually
of their obligation to maintain the
features.
a. Continue to respond to citizen reports.
Currently, the grading and/or floodplain
permit reviewer responds to each'
citizen report by first inspecting the
problem area. Documentation of each
citizen report is kept on file in the'
Environmental Division.
b. Notify residents using the stormwater
brochures and website of the Town's
contact for drainage or stormwater
concern reports.
c. Record date and description of
concern, location of documentation,
and type of action taken to address
problem in the stormwater program
database.
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c. Dec. 2004,
ongoing
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'. Ongoing
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b. Begin Mar.
2004, ongoing _
c. Begin Apr.
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2003, ongoing
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9. POLLUTION PREVENTION/ GOOD HOUSEKEEPING FOR
MUNICIPAL OPERATIONS
Municipalities have an obligation to serve as a model for the regulated community by
operating in a manner that reduces or eliminates the discharge of pollutants in urban
runoff and stormwater Municipalities can contribute a significant amount of pollutants to
stormwater through the maintenance and operation of parks, open space, and
landscaping, municipally-owned vehicles, public streets and roadways, and municipal
construction activities. Beyond the importance of setting a good example within the
community, pollution prevention and good housekeeping efforts can save the
municipality money over time. Preventing trash and other debris from entering the storm
sewer system can reduce damage to system components and lower the system repair
and maintenance cost.
9.1 AZPDES Requirements and Guidelines
The regulatory requirement for pollution prevention/ good housekeeping for municipal
operations is that regulated MS4s:
V.B.6.a Develop and implement an operation and maintenance program that
includes a training component and has the ultimate goal of preventing
or reducing pollutant runoff from municipal operations due to activities,
including but not limited to, park and open space maintenance, fleet
and building maintenance, new construction and land disturbances,
and stormwater system maintenance. The permittee shall address the
following topics in the program:
I. Maintenance activities, maintenance schedules, and long-term
inspection procedures for controls to reduce floatables and other
pollutants to the small MS4;
ii. Controls to reduce or eliminate the discharge of pollutants from
streets, roads, highways, municipal parking lots, maintenance
and storage yards, waste transfer stations, fleet or maintenance
shops with outdoor storage areas, and salt and sand storage
locations and snow disposal areas; and
Hi. Procedures to properly dispose of waste removed from the small
MS4 and municipal operations, including dredge spoil,
accumulated sediments, floatables, and other debris"
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AZPDES regulations require that a permittee's SWMP include the following information:
...
AZPDES requirement V.B.6.b
ailiti
I.
A list of the municipal operations impacted by this operation and maintenance
program;
A description of the training program for municipal employees
A list of measurable goals for the municipal pollution prevention program;
Dates, in terms of months and years, by which the permittee will achieve
specific measurable goals; and
The name(s) and title(s) of the person(s) responsible for implementing and
coordinating emplc ge trainirry and pollution prevention activities
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ii.
iii.
iv.
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v.
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9.2 Efforts to Date
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Currently the Town of~, ana has several procedures in place for me '.;ing m', ~:ipal
operations to reduce stormwater pollution. These operations include tir I maintenance
o~ ~he municipal vehicle fleet, street swee('.ing, park maintenance, and discharg,
r. Jction. Work request and work order forms <:.. .j contained in Appendix E. These forms
w je updated periodically as necessary.
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1.
Fleet Maintenance
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The town currently empi;ys service technicians to service Town vehicles on mileage
maintenance schedule as well as whenever problems are identified with a vehicle. This
helps to prevent vehicles from leaking fluids and to identify leaks early..
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Fleet maintenance operations occur at the Town of Marana Operations Center. The
newer facility provides service technicians with an indoor area to maintain the Town
vehicle fleet. All large equipment and Water Department ve;licles are kept at thic> site,
which also provides refueling services for Town vehicles. There are two additional re-
fueling sites within Town limits.
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Potential spill areas are equipped with adequate containment systems. Vehicles are
parked on a concave concrete slab during refueling to contain any accidental fuel spills.
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The vehicle maintenance building has collection and filtering systems in place where
vehicles are maintained and washed.
To date, there have been no accidents within the vehicle maintenance division. In the
event of an accident, however, staff are properly trained to handle the situation.
Smaller vehicles in the Town fleet, such as cars, are taken to commercial car washes.
Police cars are the responsibility of the officers to whom they are assigned. Maintenance
and operations personnel wash large equipment at the Marana Operations Center,
which has oil separators installed on site. Any wash water that potentially discharged to
the system, is free of oils and grease. Maintenance personnel will be instructed to use
biodegradable soaps whenever possible.
2. Street Maintenance
Public Works department is responsible for items in the Town of Marana Rights-of-Way
(ROW). Objects that enter the ROW that are not permitted or propose a hazard or threat
to human welfare or the environment are addressed as soon as the department is aware
of its presence. The presence of non-hazardous debris, trash, or other material in the
ROW is reported to a Municipal Operations staff member who responds to the report
within a single business day. The debris is removed and taken to the local landfill for
disposal.
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Interstate-10 interchanges are maintained on a regular basis by inmate cleaning crews.
The inmates work daily to clean up interchanges within the Town limits, completing
maintenance of a single interchange within a week to a week and a half. The inmates
are responsible for mowing, weeding, trimming trees, cleaning up trash and debris, and
removing animal manure.
3. Monthlv Street Sweeoina
The Town of Marana currently contracts out for the monthly sweeping of all town streets.
The contractor hired to conduct the street clean up employs a sweeper that passes PM-
10. Once the Town Council has passed a resolution accepting maintenance
responsibility for new roads, the Operations and Maintenance supervisor is notified and
the roads are added to the street sweeping list.
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4.
Park Maintenance
_!
The parks will be inspected daily for the purpose of identifying and correcting any
problems. General maintenances activities include the following.
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A. Hard-court Surfaces: All hard-court surfaces including basketball, tennis and
skate park will be inspected daily. Conditions of the surfaces that require repair
will be noted and scheduled for maintenance/ repairs as soon as resources are
available. Sidewalks and roads shall be swept or blown free of any debris after
each mowing and additionally as needed.
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B. Parking Lots: Litter shall be removed from all parking lots daily. In the event of
excess debris, a blower and/or vacuum will be utilized.
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C. Litter and trash: Litter and trash shall be collected and disposed of daily, (seven
days a week), and prior to mowing on turf areas.
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D. Playgrounds: Playgrounds shall be inspected daily for safety and cleanliness.
Maintenance needs shall be noted and repairs made immediately.
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E. General Maintenance: Benches, picnic tables, bicycle racks, trash receptacles
and any other park amenities shall be inspected for damage and repairs
immediately if necessary.
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The turf areas at Town parks are maintained using the following procedures.
A. Turf Management and Maintenance: Bermuda grass and Winter Rye grass turf
shall be maintained in accordance with accepted practices.
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B. Lighting System: Routine bulb testing and replacement shall be conducted on an
ongoing basis to ensure safety and visibility.
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C. Fences: Fences shall be inspected regularly for repairs or replacement.
Breakages or failure if fencing or gates shall be corrected immediately upon their
discovery.
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D. Structures: Structures under control of the Parks department shall be checked
and cleaned daily. Minor repairs to plumbing, electrical and furnishings shall be
made as soon as possible by the Parks crew. These structures include
Community Center, restrooms, concession areas, dugouts, pool areas and all
ramadas.
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E. Weed Control: Weeds shall be controlled only on an as needed basis and with
spot application methods with and appropriate herbicide and in accordance with
manufactures guidelines. Occasional hand weeding may be performed if it is
determined the most effective.
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Turf maintenance includes mowing and application of fertilizers, herbicides, and
pesticides. Ferrous sulfate is applied every other month to lower the pH of the soil to
between 6.5 and 7.0. Once the pH is stabilized spraying of iron may be reduced. Mowing
intervals will vary depending upon weather buy generally will be once a week during
non-peak growing and twice a week during growing seasons. Aeration of turf takes place
in late in March or early April for re-growth of Bermuda grass and late September prior to
over-seeding. Over-seeding with perennial rye grass occurs between September 20th
and October 20th and depending on current weather conditions. Herbicides are used
only on a spot-application basis. All lawn chemicals are applied in minimal amounts and
in such a way as to reduce the likelihood of significantly contaminating stormwater
runoff.
The fertilizer, herbicide, and pesticide applications are done according to the following
schedule:
January February March Aoril
Spray Ferrous Sulfate Fertilize with Turf Spray Ferrous Sulfate
Suoreme
May June July AUQust
Spray Ferrous Sulfate Spray Ferrous Sulfate
Fertilize with Suoerturf
Seotem ber October November December
Fertilize with Spray Ferrous Sulfate Spray Ferrous Sulfate
Turf Supreme
Fertilize with Nitra
Kino
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The Parks and Recreation Department utilizes a programmable system to control
irrigation length and timing. This system is equipped with sensors that will turn off the
irrigation system in the event of rain, thus reducing the likelihood of water runoff from
irrigated areas. The Department is in the process of upgrading this system to one that
provides better control of watering cycles. This new system connects to an electric main
valve at each park. In the event of a break in the irrigation line, the system will shut down
the necessary valve automatically in order to stop the leak.
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In 2000, the park personnel began implementing low water maintenance at the park.
They are using native vegetation such as mesquite to landscape. This in turn lowers the
amount of water that might leave the parks as runoff. In any non-recreation areas of the
park, grass is being removed and replaced by drip-irrigated landscaping. These areas
comprise approximately 35% of the park. Lawn areas in the park are watered for 30
minutes at night, five days of the week. If additional watering is needed, this is done
under staff supervision during the day.
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There are currently no drainage facilities in the park. In the case of any storm event the
parking lot on the North side of the park retains water. This water is then pumped from
the parking lot into the park grass.
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During the summer months when the pool is in operation, the Town of Marana hires staff
to manage the pool activities. Pima County Health Department requires at least one of
the persons that work at the pool to have a pool operator certification. Pool operators are
trained to deal with water leaks and hazardous materials contamination. The Town
stores these certifications, and others such as the landscaping certification, on file within
the Marana Recreation Department.
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5. Storm Water Runoff System Maintenance
The Town of Marana Stormwater Runoff Systems is comprised of some curb and gutter
infrastructure, drainage channels, catch basins, and a single pump station. The drainage
channels are inspected and bladed once a year to clear out debris or other potential
blockages. Storm runoff flows into catch basins, where sediment and other pollutants are
allowed to settle out. These basins are then emptied of sediment and debris once a
year. This waste material is then taken to the local landfill for disposal. The pump station,
which retains any floatable materials that enters with stormwater runoff, is cleaned of this
debris on a yearly basis.
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6. Land Disturbance on Town Property
For municipal construction projects, the contractor hired for the project is required to
submit their Stormwater Pollution Prevention Plan (SWPPP) to the Town as an
assurance of the adequacy of their stormwater runoff controls. These projects are then
inspected by either in-house building inspectors or private consultants. The inspectors
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make sure that the project is being constructed to plan and that the Stormwater Pollution
Prevention Plan (SWPPP) is being implemented.
7.
Containment of Potential Pollutants
The street maintenance crew uses herbicides to control noxious or invasive plant
species within Town Rights of Way. The Town of Marana utilizes biodegradable
substances where possible. The herbicides used include chemicals with differing modes
of action such as defoliants, soil sterilizers, and pre-emergents. The chemicals are
stored in large sealed plastic drums set in spill packs. Any spills that may occur during
handling will be caught in the spill packs and prevented from contact with bare ground or
pervious surfaces.
8. Waste Disposal
Waste materials generated or collected by the street maintenance crew, fleet
maintenance, or parks maintenance, such as motor oil, trash, or other debris, are
disposed of properly depending upon the materials. Oils, used oil filters, and similar
materials are collected, contained, and disposed of according to law.
9.3 Action Plan for Pollution Prevention/ Good Housekeeping for
Municipal Operations
The Town of Marana's action plan for control of stormwater runoff from Municipal
Operations is as follows. The format is structured according to the AZPDES guidelines
provided by ADEQ.
9.3.1 Impacted Municipal Operations
V.B.6.b.i Include in the SWMP a list of the municipal operations impacted by this
operation and maintenance program.
Fleet maintenance
Street maintenance and street sweeping
Park maintenance
Municipal roadway and building construction projects
Waste disposal
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9.3.2 Training Program
V.B.6.b.ii
Include in the SWMP a description of the training program for municipal
employees.
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Town employees responsible for implementing this plan will receive a minimum of 24
hours of annual continuing education training on stormwater management issues. This
training may involve attendance at a storm water training workshop or a required reading
of stormwater-related Department standard operating procedures and policies. All Town
employees will receive storm water related outreach and education materials explaining
ways to reduce waste and proper disposal of trash (emphasizing waste reduction and
recycling), and job-specific BMPs where applicable.
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This training will include information on how their everyday actions at home and at work
mayor will affect the stormwater quality: our community. Informational materials will
include the location of the Town's stormwater library as well.
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9.3.3
Measurable Goals
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V.B.6.b.iii
Include in the SWMP a list of measurable goals for the municipal
pollution prevention program.
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The measurable goals for each BMP related to Municipal Operations can be found in
Table Six: Pollution Prevention/ Good Housekeeping for Municipal Operations Measures
and Milestones (found on page 9-10).
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9.3.4 Implementation Schedule
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V.B.6.b.iv
Include in the SWMP date:; in terms of months and years, by which the
permittee will achieve specific measurable goals.
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112
....
The dates by which each measurable goal will be achieved are specified in Table Six:
Pollution Prevention/ Good Housekeeping for Municipal Operations Measures and
Milestones (found on page 9-10).
9.3.5 Staff
V.B.6.b.v
Include in the SWMP the name of the person(s) responsible for
implementing and coordinating employee training and pollution
prevention activities.
Staff members will review existing municipal operations and coordinate employee
training, which Municipal Operations or Human Resources personnel will implement,
Staff members responsible for implementing and coordinating training and public
reporting are listed in Table Seven, which is contained in Appendix A of this SWMP. In
the event that any of these individuals is no longer available to work on the project, a
replacement will be designated by the Town of Marana.
9.4 Measurable Goals and Implementation
The following Table outlines the BMPs and measurable goals the Town will implement to
manage runoff from Municipal Operations.. The table includes the implementation
schedule and references to the relevant AZPDES requirements.
9.4.1 Table Six: Pollution Prevention and Good Housekeeping for
Municipal Operations - Measures and Milestones
--,
Reference BMP Measurable Goal Target Date
V.B.6.a 1. Staff will a. Develop a procedure to record data a. Feb.
V.B.6.b.iii improve record- on municipal operations and 2004
V.B.6.b.iv keeping in maintenance procedures,
V.B.6.b.v regards to including date, location of activity,
municipal description of activity performed,
maintenance and assessment of stormwater
and operations pollution prevention effectiveness
113
procedures
b. Develop a database for municipal b. May
maintenance and operations 2004,
information onQoinQ
V.B.6.a 2. Develop and a. Review existing storage and a. Ongoing
V.B.6.b.iii implement handling procedures.
V.B.6.b.iv improved
chemical b. Research and develop an improved b. May
storage facilities set of procedures. 2004
and chemical
handling c. Implement new procedures c.June
procedures. 2004
V.B.6.b.iii 1. Staff will a. Street sweeping - number of lane a. Sept
V.B.6.b.iv manage runoff miles swept annually will be 2005
V.B.6.b.v from municipal recorded in MS4 annual report
maintenance
operations b. Fleet maintenance records will be b. Ongoing
available for review upon request.
V.B.6.b.ii 1. Staff a. Staff responsible for a. Nov 2005
V.B.6.b.iii training implementation will develop and ongoinJ
V.B.6.b.v stormwater SWMP orientation beginning I
training and annual stormwater when
BMP training for all staff. The SWMP
annual report will contain the posted for
dates and number of attendees of public
,
training seminars attended. comment
b. Staff responsible for b. Ongoing
implementation of the SWMP will
develop job specific stormwater
BMP training and educational
materials for maintenance
personnel and construction
stormwater inspections. Materials
presented will be included in
annual report or available upon
request.
114
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1 O.IMPLEMENTA TION CONSIDERATIONS
The following sections address the implementation of plan elements including monitoring
compliance, updating the SWMP, and annual reporting.
10.1 Qualifying State or Local Program
....",,'"'
The Town of Marana has developed new best management practices in response to the
need to apply for a municipal stormwater discharge permit. The Town is not aware of
any qualifying local or state programs that would adequately address the requirements
of the Small MS4 General Permit.
10.2 Sharing Responsibility
The Town of Marana will have the responsibility to implement all measures within this
SWMP. The Town will not share responsibilities with other municipalities.
10.3 Reviewing and updating the SWMP
The Town of Marana will review the SWMP annually, starting in September 2005, (when
comments were received from ADEQ on the 2003 draft SWMP). Staff will evaluate the
implementation status of the BMPs contained in the SWMP as well as the effectiveness
of each BMP. The Town will determine if the SWMP needs to be revised. If the SWMP
requires modifications, the Town will notify AD EO. The Town will submit to ADEQ the
proposed revisions with an explanation of why the changes were needed, and what the
Town expects to achieve by the changes in relation to the goals of the best management
practices.
If ADEQ requires the Town of Marana to make specific changes to the SWMP, the Town
will adopt these changes within thirty (30) days and will certify to ADEO within sixty (60)
days that the changes have been made.
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10.4 Monitoring
A
The Town of Marana will evaluate program compliance, the appropriateness of identified
BMPs, and progress towards achieving identified measurable goals. The Tow.;
separate storm sewer system drains to the Santa Cruz River. At this time, a Total
Maximum Daily Load (TMDL) has not been established for this receiving water. The
Santa Cruz River is not listed on Arizona's 303(d) list, therefore the Town will not sample
and analyze discharge from the small MS4 at this time.
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10.5 Annual Reports
....
The Town of Marana will submit an annual report to ADEQ by September 30, 2004 for
the period of time between March 30, 2003 and June 30, 2004. Starting in 2005, the
Town will submit additional annual reports by September 30 of each year for the
preceding period of July 1 through June 30.
-".
"".
Each annual report will include:
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1. The status of compliance with permit conditions, an assessment of the
appropriateness of the identified best management practices, progress towards
achieving the statutory goal of reducing the discharge of pollutants to the MEP and
protecting water quality, and the measurable goals for each of the minimum control
measures;
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2. Results of information collected and analyzed, if any, during the reporting period,
including monitoring data used to assess the success of the program at reducing the
discharge of pollutants to the MEP;
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3. Any changes made to the SWMP since the last annual report and a summary of the
stormwater activities the permittee plans to undertake during the next reporting cycle
(including an implementation schedule);
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4. Proposed changes to the stormwater management program, including changes to
any BMPs or any identified measurable goals that apply to the program elements;
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5. A description of BMPs to be implemented within new areas annexed over the past
year if the annexed areas are located within the regulated boundaries of the MS4;
6. A description and schedule for implementation of additional BMPs that may be
necessary, based on monitoring results, to ensure compliance with applicable
requirements; and
7. Notification if the permittee is relying on another government entity to satisfy some of
the permit obligations (if applicable).
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Referen ces
....
Alameda Countywide Clean Water Program. (July 31, 2001). Draft Stormwater
Management Plan, July 2001 - June 2008. Retrieved Oct 6,2005 from:
http://www.cleanwaterprogram.org/ACCWP_SWOM.....all.pdf.
-
American Public Works Association (APWA). (2000). Designinq and Implementing an
Effective Storm Water Management Program.
-
Arizona Department of Environmental Quality,(ADEO) (2004). Frequently asked
questions (faqs): permitting. Retrieved Sep. 20, 2005. .rom Arizona Dppartment of
Environmental Quality Web site: http://www.azdeq.gc . eb/waterpJ i 4.
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Arizona Department of Environmental Quality. (Dec.
Issuance of the AZPDES Small MS4 General Permit.
2002).Fact
for the
Center for Environmental Research and Service, Department of Bic cal and
Environmental Sciences, Troy State University. (May 2000). "How to" Guide for
Stormwater and Urban Watershed Management. Troy, Alabama.
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Environmental Protection Agency (EPA). (2003). Clean Water Act. Retrieved Sep. 12,
2005 Fror; EPA Web site: http://cfpub.epa.gov/npdes/cwa.cfm?program_id=6.
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EPA. (2003). Frequently Asked Questions (faqs). Retrieved Oct. 3, 2005 from EPh, Jeb
site: http://cfpub.epa.gov/npdes/faqs.cfm?program_id=6#174.
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Griffin International prepared for Town of Colchester. (March 2002). Town of Colchester
Municipal Stormwater Management Plan.
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Marriott, Deborah, Bruce Sutherland, Janet Gillaspie, Carmel Kinsella Brown, P.E., et al.
(June 1998). Stormwater Toolbox for Maintenance Practices.
-
Center for Environmental Research and Service, Department of Biological and
Environmental Sciences, Troy State University. (May 2000). "How to" Guide for
Stormwater and Urban Watershed Management. Troy, Alabama.
--
Spellman, Frank R., Drinan, Joanne E., editors. (2003). Stormwater Discharge
Management. Government Institutes and ABS Consulting.
-
RW Beck (Consulting) for City of North Bend. (January 2001). Comprehensive
Stormwater Management Plan (Draft).
...
Sanitation District NO.1 of Northern Kentucky. (June 2002). NPDES Phase II Storm
Water Management Plan.
-
Town of Marana. (1999). Town of Marana Stormwater Master Plan Tortolita Alternative
Formulation Report.
-
118
.-,
Town of Marana. (1998). Town of Marana Stormwater Master Plan Phase I Report.
US EPA. (1999). NPDES Final Rule: 64 Federal Register 68722 et seq. Retrieved
October 6,2005 from: http://www.epa.gov/npdes/regulations/phase2.pdf.
US Environmental Protection Agency (US EPA) Office of Water. (1995). NPDES Best
Management Practices Manual. Government Institutes, Inc.
US EPA. Office of Wastewater Management. (Sept 1992). EPA 832-R-92-005. Storm
Water Management for Construction Activities. Retrieved Jan. 31, 2001 from
http://www.epa.gov/owm/sw/conguide/index.htm
US EPA. Office of Water. (January 2000). Storm Water Phase II final Rule. Fact sheets
2.3 through 2.10.
Washington state Department of Ecology. (September 2002). Stormwater Management
for Eastern Washington: Model Municipal Stormwater Program.
Woodward-Clyde Consultants for Los Angeles County Department of Public Works.
(Sept 3, 1996). Critical Source Selection and Monitoring Report.
""",,"'.
~
~
;\>~-
119
Appendix A
Town of Marana AZPDES Compliance Area Maps
NOI Forms and Revisions
Table Seven - Responsible Individuals
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A-I
LOCATION MAP
Southern Marana
NPDES Compliance
Area Map
A-2
N
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1
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1
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J
D NPDES Compliance
Area
C Marllna Town Limits
.~ _ ~u. o..l.!.7~ ! ~I."
;._-- -
@ 10105 Town of Marana
~ Arizona o..-rtmant of Environmental Qu..1ty
ALL REQUESTED Water Penn'" Section
INFORMATION MUST ~; 1110 W. Wuhlngton. 541&8-3, Phoenix, ArIzone 8&007
BE PROVIDED ON NOTICE OF INTENT (NOI) FOR COVERAGE
THIS FORM under AZPDES Pennlt No. AZG200Z-GOZ for
DlM:harga from S"",I/ MS4s to WlIfIn of the United States
CHECK AS APPUCABLE: NEW NOI REVISED NOI .f Applicant is:
- -
IF A REVISION, PROVIDE PRIOR AUTHORIZATION NO. Federal Slate
MS42002-21 .f Other PhaS8if,..S4
PERMITTEE (Agency ~po",lble for the Dl8charge)
Applicant's Narne: Town of Marana Phone: (520) 382-2600
Applicant's Mailing AddI'll88: 11555 W. Civic Center Dr., Bldg. A-2
City: Marana Zip Code: 85653
CONTACT PERSON
Name: Lisa M. Duncan Phone: (520) 382-2630
E-mail Address: Iduncan@marana.com Fax: (520) 382-2540
Contact Peraon's Agency and Title: Town of Marana, Environmental Planner
LOCATION INFORMATION
Name of Urbanized Area where the MS4 is located: Tucson Urbanized Area
Name of county(ie8) where the MS4 is located: Pima County
Provide the following infolTl18lion on the approximate canter of the MS4:
Latitude: -1Lo 25 53 . Longitude: -.!.!!..-o ~---1L.
Township: 11S Range: 12E Section: 31
Is any portion 01 the MS410cated in Indian Country? No ~ Yes _ If yes, name
Does any portion of the MS4 sel'Yica . population within Indian Country? No ~ Yes -
If yes, how m.ny people within the Indian Country are served by your MS4?
Name(s) 01 neighboring TribeslCountiealCitieslTowns (places that share borders with the permittee):
City of Tucson T ortoIlta Mountain Park
Pima County
Town of Ora Valley
Pinal County
Saguaro National Park
..._if
-
-~
A-3
--
.-
WATERSHED INFORMA
Name ofWaterllhed: l(
Name of Receiving Water(s):
'II
Santa Cruz River
-
Is the Receiving Water a 303(d) Impaired
Water?
lower Santa Cruz River Yes _ No ....:L-
RIllIto River Yes _ No....:L-
BrawlevWash Ves_ No~
If any of tha recelvlnll_tenl ani 303 (d)-l"ted Impal...d Waters, you must completa the ImpallWd Water
Infonnatlon portion of th.. 1onn.
-
-
IMPAIRED WATERS INFORMATION
If you indicated that any of the receiving waters to which you discharge are listed as a 303 (d) Impaired Water,
please answer the following questions.
Is there a Total Maximum Daily load (TMDl) for the 303(d) Impaired Water?
Yes _ Proceed to Part A No....:L- Proceed to Part B
Part A. Does the TMDl prescribe a wasteload allocation to stormwater discharge from your MS4?
Yes _ Check the box below No -L Proceed to Pari B
_ / certify that /he SWMP idenlirl6s specific BMPs that will be used to meet wastaload allocations. / also
certify /hat / Wl7/ monitor for pollutants for which my MS4 is assigned a wasteload a/location.
-
-
Part B. Check the box below if the MS4 has the potential to discharge the pollutants identified on the 303( d) list
_ / certify /hat the description of the SWMP addresses specific BMPs for reducing the disdJaf'JfI of
303(dHisted pollutants.
-
ADDITIONAL INFORMATION
J!"'-.,
This NOI must include the following attachments prepared as specified in Part III of the general parmit.
....:!.- A description of your StormWllter Management Program.
Has another governmental entity agreed to satisfy any of your permit obligations?
Yes _ If yes, check the boxes below No-L
_ The agreement is explained in the description of your Stormwatar Management Program.
_ Written dOCOOl8ntation of your agreement is included as an attachment.
,fI..-
""
CERTIFICATION
This cartification must be signed by the appropriate party as specified in this general permit Part VI.L.
"/ certify under penaUy of law that this document and all attachments were prepared under my direction or
supervision in accordance with a systam designed to assure /hat qualified personnel prr>perty gath6red and
evaluated the information submittad. Based on my inquiry of th6 person or persons who manage the system or
those persons directly responsible for gathering /he infotmation, the information submitted is. to the best of my
knowledge and belief, true, accurete and complete. I am aware /hat there are significant penalties for submitting
false infomration. including the possibility of fine and imprisonment for knowing violations. In addition I certify that
the parmiltaa will comply with all terms and conditions stipulated in General Permit No. AZG2002-002 issued by
th6 Director. .
-
.-
Printed Name of Applicant's Representative: L; SA M.]) kn L "'..,
~- h f)~ ____
Title: C:t"I VI,.o"",<U\twl
Pt"V"1f\-<:A
Date: 9/ <? I,.,>S
-
Sianature of AoDlicanfs Reoresantatlve:
-
-
...
...
A-4
...;
,..;OIiP~ Arizona Department of Environmental Quality
ALL REQUESTED Water Permits Section
INFORMATION MUST ~; 1110 N. Washington, 5415B-3, Phoenix, Arizona 85007
BE PROVIDED ON NOTICE OF INTENT (NOI) FOR COVERAGE
THIS FORM ~~~ under AZPDES Permit No. AZG2002-o02 for
Discharues from Small MS4s to Waters of the United States
CHECK AS APPLICABLE: NEW NOI - REVISED NOI ~ Applicant is:
IF A REVISION, PROVIDE PRIOR AUTHORIZATION NO. Federal State
~o.';<.. 00"'\ tq.-\ rq,<>o.:~ 0..,.., a..,^-~ ... -.,t... Other~1.Io,) n(S,." t-\~'~
PERMITTEE (Agency Responsible for the Discharge)
Applicanfs Name: \C>~C'\ 'O\;; t--'\"",,,-,,c... Phone: (5J...o) J. 9 1 ~ .;)..'1 ~ D
Applicanfs Mailing Address: 3(.,,\L.. \. ...\ . 0 r "-""''3- b ro 'J'C--
City: -"\\.L'-~D" Zip Code: &Sl"ll
CONTACT PERSON
Name: ~ o-rv",-,,\ (,.. ,\\ Phone: (5~) ~'Yl- J.."\ 2..0
E-mail Address: 'n 'j" \ \0 n-<"\o...n....c-'V).... .w,",",,", Fax: (5~'> .;t'1i. 3,,\:'0
Contact Person's Agency and Title: A- ~~\ ~\......." ~ vb'(.. '-' IA.J o,..l." U, ":e~~~ r
LOCATION INFORMATION
Name of Urbanized Area where the MS4 is located: \ \.)C,t;r- v...-\::'c. ~ \,....d. r-. ~
Name of counly(ies) where the MS4 is located: 9\.~.:..... Cr;, ,^"",,", '-'\
,
Provide the following information on the approximate center of the MS4:
Latitude: N "3?- . I' ,'53 . Longitude: ~. ~' 25 .
"'~
Township: \\ S Range: \ -, Co Seelion: ;,\
L-<-
Is any portion of the MS4 located in Indian Country? No --..:6.... Yes _ If yes, name
Does any portion of the MS4 service a population within Indian Country? No.l Yes -
If yes, how many people within the Indian Country are served by your MS4?
Name(s) of neighboring TribeslCountieslCities/Towns (places that share borders with the permittee):
-"\-.J c',,-:, (\ (1 r,', \J c \.\"'-~ ( ""I,.,'! <..'-:'~
?\~r... ~'""'-\ .", ,
Pd'(~\ c." A~ -\-, ,
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-,-:~,.:\ ,,\~ <- M.,,^~:..,, '1f""".<='L r~,-
.-......."
A-5
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-
-
WAT:::RSHED INFORMATION
Name of Watershed: V---" Ii' <>r
Name of Receiving Water(s):
s"""~<-- Q..r,^-1.. .Q:,n..w\...", -.,)c...,,\'" Q..,\\.A~
, l
Is the Receiving Water a 303(d) Impaired
Water?
Yes_ No ~
Yes_ No_
Yes_ No_
If any of the receiving waters are 303 (d)-listed Impaired Waters, you must complete the Impaired Water
Informati.on portion of this form.
-
S erC'. ~- ~,^-1-
~;
IMPAIRED WATERS INFORMATION
If you indicated that any of the receiving waters to which you discharge are listed as a 303 (d) Impaired Water,
please answer the following questions.
-
Is there a Total Maximum Daily load (TMDL) for the 303(d) Impaired Water?
Yes Proceed to Part A No Proceed to Part B
-
Part A. Does the TMDL prescribe a wasteload allocation to stormwater discharge from your MS4?
Yes _ Check the box below No _ Proceed to Part B
_ ! certify that the SWMP Identifies specific BMPs that will be used to meet waste/oad allocations. I also
certify that I will monitor for pollutants for which my MS4 is assigned a wasteload al/ocation.
-
Part B. Check the box below if the MS4 has the potential to discharge the pollutants identified on the 303(d) list.
_ I certify that the description of the SWMP addresses specific BMPs for reducing the discharge of
. 03(d)-listed pollutants.
-
ADDITIONAL INFORMATION
This NOI must include the following attachments prepared as specified in Part III of the. general permit.
_ A description of your 5tormwater Management Program.
....
Has another governmental entity agreed to satisfy any of your permit obligations?
Yes _ If yes, check the boxes below No ~
_ Te, c, agreement is explained in the description of your Stormwater Management Program.
""
_ Wnaen documentation of your agreement is indudE'
,n attachment.
CERTIFICATION
This certification must be signed by the appropriate party as specified in this general permit Part VI.L
-
"' certify under penalty of law that this document and all attachments were prepared under my direction or
supervision In accordance with a system designed to assure that qualified personnel properly gathered and
evaluated the information submitted. Based on my inquiry of the person or persons who manage system or
those persons directly responsible for gathering the information, the information submitted is, to thc.Jest of my
knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting
false information, Including the possiMity of fine and imprisonment for knowing violations. In addition I certify that
the permittee will comply with all terms and conditions stipulated in General Permit No. AZG2002-002 issued by
the Director. . ~ /. :-\ ~ I . L'
H' -rl .r q \ '1 7-ot"",_ r....lno'.;fo--t..
Printed Name of Applicant's Representative: I Ino~ '" 5 t=)', \ J\,- Title: (JjJI,t (,J...r."fc J
.. ---2'/;::1./1.. _ 0 _.4-1.7 _. // <':. d,-;(2
....
-,
....,
...
-
A-6
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"""""'
A~IZONA DEPARTMENT
OF
ENVIRONMENTAL QUALITY
~'
~J
Janel Napolitano
Govemor
1110 West Washington Street. Phoenix, Arizona 85007
(602) 771-2300' www.adeq.state.az.us
Stephen A. Owen,
Director
March 18, 2003
Farhad Moghimi
Public Works Director
To'Ml of Maran a
3696 W. Orange Grove Blvd.
Tucson, AZ 85719
Re: Arizona Pollutant Discharge Elimination System Permit for Municipal Stormwater
Discharges (Small MS4 General Permit)
Dear Mr. Moghimi:
....
We have received your Notice oflntent form (NO!) and Stormwater Management Program
(SWMP) for application to discharge under the Small MS4 General Permit (AZG2002-002). We
will review these documents and respond to you when review is complete. If ADEQ determines
that amendments to the SWMP are necessary, we will send you written notification as described
in Part V.E. of the permit. Please contact me at (602) 771-4449 if you have any questions about
stormwater permitting or the status of your SWMP review.
Sincerely,
...
4~
Karyn Moldenhauer
Stormwater Project Manager
Surface Water Permits Unit
SWPU03;Olll
,,;
A-7
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Table Seven - Table of Responsible Individuals
A
Town of Marana Staff Responsible for SWMP Implementation
Section & Name Title Email Phone
Responsibility
6.3.10 - i
7.3.7 - Manager, (520)
8.3.7- draft/review Jennifer Environmental tflristelman 382-
ordinances Christelman Engineering (romarana.com 2665
Division
4.3.7 - Technical
Coordination
5.3.2.5 - Designated i
I
Contact for Stormwater
Program
5.3.3 - Comment
review & response
5.3.7 - Coordination
and implementation
6.3.10- Coordination
with GIS, draft
ordinances, schedule Iduncan (520)
inspections Lisa M. Environmental @marana.com 382-
7.3.7 - Develop Duncan Planner 2630
inspection procedures,
draft ordinances,
response to public
reporting
8.3.7- Develop
procedures, coordinate
training, draft
ordinances
9.3.5 - Coordinate
Municipal Operations
procedures, training,
reporting procedures
4.3.7 -
5.3.3-
5.3.7 -
8.3.7- (520)
9.3.5- Environmental dust
Administrative Corby Lust Aide (wmarana.com 382-
coordinator & initial 2628
public contact
6.3.10 - perform
inspections
4.3.7 - Administrative/ Debbie Document dpickard (520)
document files Coordinator @marana.com 382-
-
",#.
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..
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.1/1>.
-
...
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Jli
"'",
-
A-8
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Pickard 2686
6.2.2 Dennis Emergency ddoian (520)
9.2 (2)- Spill response Dolan Response - (wmarana.com 382-
Municipal 2501
Operations
A-9
Appendix B
Illicit Discharge Detection and Elimination Procedures
Dry Weather Outfall Inspection Checklist
ConmlUnity Response Report Form
B
Illicit Discharge Detection and Elimination Procedures
Town of Marana Stormwater Management Program
An illicit discharge is any discharge ( or seepage) to a municipal separate storm sewer
system (MS4) that is not composed entirely of storm water or uncontaminated
groundwater. The following non-stormwater discharges are allowable, provided they are
not identified as significant contributors of pollutants to or from the MS4:
Allowable Non-Stormwater Discharges
Water line-flushing
Landscape irrigation
Diverted stream flows
Rising groundwater
Un-contaminated groundwater infiltration
Un-contaminated pumped groundwater
Discharges from potable water sources
Foundation drains
Air conditioning condensation
Irrigation water
Springs
Water from crawl space pumps
Footing drains
Lawn watering
Individual residential car washing
Flow from riparian habitats and wetlands
De-chlorinated swimming pool discharges
Street wash water
Discharges from emergency fire fighting activities
NPDES or AZPDES permitted discharges (such as the effluent from the.lna Rd
Treatment Plant)
The following discharges may qualify for permit coverage under the
AZPDES de Minimus General Permit:
1. Discharge associated with the operation of potable water systems;
2. Discharge associated with water well construction, maintenance,
rehabilitation and development or water supply or quality investigations
3. Discharges associated with structural integrity (hydrostatic) testing of new
pipelines, pipelines associated with the installation and maintenance of
sewer or reclaimed water transport systems.
B-1
-
4. Discharges of groundwater, surface water or potable water associated with
the testing of certain pipes tanks, or vessels that have been previously used
to transport oil and gas
5. Discharges from reclaimed water systems
6. Discharges associated with subterranean dewatering
7. Discharge of residential non-contact cooling water
8. Discharge of building and/ or street wash water when only biodegradable
soaps and/or water are used
9. Discharges from charitable noncommercial car washes when only the
exterior of the vehicles are being washed with biodegradable soaps and/or
water
10. Discharges for drainage from swimming pools
11. Note: Mobile car washes are not eligible and this permit does not cover
releases from pipeline breaks or other spills.
-
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Dry Weather Outfall Inspections
-
All stormwater outfalls will be inspected in an effort to detect dry weather flows
indicating possible illicit discharges during the 5-year permit term. The Town of
Marana has identified 296 outfall structures within the stormwater compliance
area at present. This total consists of 233 spillways, 48 pipes, 10 dips, 4 inlets,
and 1 "other". All of the identified structures do not classify as outfalls, but rather
many are components leading to outfalls. During the first permit term, at least 25
percent of the structures will be inspected annually to detect and eliminate illicit
discharges to the Town of Marana's Municipal Separate Storm Sewer System.
The following discussion presents the recommended outfall inspection
procedures and schedule. These procedures and schedule may be amended as
necessary to more efficiently address illicit discharges within the Town of Marana
compliance area.
""",
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-
-
-
Outfall screening is not to be conducted within 72 hours following a rain event of
0.1 inches or greater. Inspectors will obtain necessary safety equipment and
implement appropriate safety procedures in accessing outfall locations.
Inspectors will familiarize themselves with outfall locations and with the operation
of all field equipment prior to field inspection. In addition, inspectors will ensure
all field equipment is in proper working order prior to field inspection.
....
....
..",
Screening Inspection Schedule
-
For scheduling purposes, five main inspection areas within the Town of Marana's
compliance area are identified by Township, Range, and Section.
-,
B-2
-
These inspection areas are identified as:
East-Southeast inspection area currently includes outfalls in Township, Range,
and Sections (TRS): T12S R13E sections 31 and 32, T13S R13E sections
5, 6, and 8
South-Southwest inspection area currently includes outfalls in TRS: T13S R12E
Sections 1 and 2
Central-North inspection area currently includes outfalls in TRS: T12S R12E
Sections 25,26,35 and 36
West inspection area currently includes outfalls in TRS:
T12S R12E Sections 27-29,33 and 34
Northwest inspection area currently includes outfalls in TRS: T12S R12E
Sections 16-17, and 20-22
The division of the main inspection areas is consistent with a desire to initially
prioritize outfall areas in commercial and industrial areas. The designations also
allow for encompassing inspections in areas that may be annexed in future
development of the Town of Marana.
Outfall inspection will progress in a logical sequence beginning downstream and
progressing upstream within channel reaches. Inspections will begin with the
outfalls within the East-Southeast area first. Land use in this area consists of
older commercial areas east of 1-10. These inspections will be followed by
outfalls in the South-Southwest area, west of 1-10, which includes commercial
and industrial land uses adjacent to the 1-10 eastbound frontage road and in the
Cortaro Rd. Silverbell corridor. The third set of inspections will consist of the
Central-North area outfalls west of 1-10, that contain additional commercial
development north of Cortaro Rd., a golf course, and residential land uses. The
West area outfalls consist mainly of residential land uses, schools and golf
course, and will be scheduled for the fourth phase of inspections. Outfall
screenings in the Northwest area, west of 1-10, that serve school and residential
areas, are scheduled for the last screening inspection phase. The inspection
areas will be expanded to encompass the entire Town as the urbanized areas
are reassessed. During the first permit term only outfalls in portions of the Town
in the current compliance area will be mapped and inspected.
Citizen inquiries and concerns
Illicit discharge and dumping reports will be recorded and investigated within 48
hours. Corresponding outfalls will be identified and the dry weather field
B-3
- ^_"_'_'M_~",_.~..",~.~,~._.<.""-_~............-.."""_...;",,~,.,,,,,,~,^_.". ... .
-
screening of outfalls'procedures will be followed. If required, proper notifications
will be made under the State Emergency Response Program. Customers making
inquiries or registering concerns will receive a response and be kept updated of
progress on resolving any issues. These responses and customer interactions
will be properly documented in the incident file.
-
Inspection
-
The inspector will complete the Outfall Field Screening Report for each outfall, on
either a paper or electronic form. The assigned structure 10 and Photo 10 number
from the May 2004 inventory will be noted on the form. A current photo will be
taken to document changes at the outfall. Upstream land use and weather
conditions will be recorded.
~
A visual observation of the outfall will record the presence or absence of water
during dry weather. Presence of foam, oil sheen, trash, and/or floatable
materials, presence of bacterial sheen or slimes, staining of banks, outfall
structure, and/or vegetation, excessive vegetative growth and odor will also be
recorded. In the presence of water, the flow rate and water clarity and color will
be recorded by visual inspection. A description of the outfall structure and
condition must be provided. Structural damage will be noted for action and re-
inspection.
..
-
-
If flowing water is present, the inspector will determine whether it is appropriate
to utilize a 'stormwater test kit' to field test for ph (7.0 is neutral, elevated levels
are <6.5 and> 8), copper (possible sources include automobiles, industrial,
architectural, some pesticides), chlorine, or phenols (chemicals contained in
disinfectants such as household cleaners and if found should be relatively close
to source). The sample shall be taken at the point of discharge (not in stream)
and recorded on the Field Sample Record. Two samples within 24-hours will be
collected, with a minimum of 4 hours between samples.
-;
-
-
If the field test indicates presence of contamination (elevated levels at 0.2 mg/I or
greater), a grab sample shall be obtained and submitted to an analytical lab
under proper chain of command procedures. Parameters for lab testing will vary
and are dependent upon visual observations. If water is black, oily, and/or
greasy or smells like gasoline, the flow should be analyzed for TPH and BTEX. If
the water is gray and smells like sewage, the discharge should be analyzed for
E. coli.
-
-
-
B-4
Notify appropriate agencies within 24 hours when any type of significant illicit
discharge is found that has the potential to seriously affect water quality,
designated uses, or public health:
Northwest Fire Department: 911
Arizona Department of Environmental Quality
Southern Regional Office: 628-6724
Elimination
The inspector will follow the discharge upstream to determine the source if
flowing or ponded water is present. If the source can be determined and has the
potential to be a source of pollutants, as evidenced by field or laboratory testing,
the discharge should be considered illicit and action should be taken to notify the
Primary Responsible Party (PRP) to eliminate the discharge within 10 business
days of the detection. The inspector shall notify the responsible party verbally
and follow-up with written notification within 1 week (or following receipt of lab
results).
The written notification shall include a copy of the inspection report, and a
request for action to be taken within 5 business days. If the responsible party
does not respond and/or comply with the schedule, staff may conduct a site
inspection and will investigate existing legal authority to obtain compliance. A
summary of relevant existing Town of Marana Code is appended to this
document.
All responsible parties for sources of dry weather flow will be given public
outreach materials, as they are available or updated. If the source of a dry
weather flow cannot be determined and test results indicate the presence of a
pollutant, the inspector shall report findings to the Stormwater program manager
for further investigation on a case-by-case basis.
If visual inspection does not indicate the presen ce of water, however signs of possible
illicit discharges (floatable materials, staining, bacterial slimes, excessive growth, or
odor) is evident, the outfall will be re-inspected periodically to monitor changes in
physical parameters.
The presence of trash or debris indicating illegal dumping activity will be noted for
possible signage.
B-5
"14,
Reporting
-
In addition to field screening reports and sampling records, all corrective and elimination
actions will be documented. A Database will hold all records of reporting and inspection
activities, and link the activity t the outfall number. Annual reporting will address the
number of illicit discharges fo.:. .J, the number eliminated, timeliness of elimination and
legal authority utilized, if applicable.
-
-
-
Sign age
-
In an effort to prevent illicit discharges and illegal dumping, the Town of Marana
will applv storm drain markers or stencil outfalls, and illegal dumping signs will be
installeo within the compliance area. The following installation procedure will be
implemented:
-
1. Prior to outfall field screening, the inspector will review existing records for
illegal dumping in the quadrant under review and inspect these areas while
in the field in addition to locating new outfall locations.
-
2. In the field, the inspector will record the presence or absence of illegal
dumping dur :1g field screening of outfall locations and known areas of
dumping, and record any existing "No dumping" and "Report Illegal
Dumping" signs as accurately as possible, utilizing GPS equipment, if
available.
-
~
-
3. If signs of dumping exist, the inspector will report the dumping to the
Stormwater program manager who will notify the appropriate party or
department for remediation. If no sign exists, recommendation for
placement of an illegal dumping sign will be forwarded to the Traffic
Department. Signs shall be installed in areas that have no dumping but
have had 2 or more reports of dumping activity during the previous year.
-
4. Storm drain markers will be applied at all storm drains. The storm drain
markers will be placed at the inlets to the outfalls, where appropriate. The
inspector will recommend locations for markers at his/her discretion and
coordinate with the. Stormwater program manager for placement of the
markers within le~ J locations. Where appropriate, stormwater outfalls will
be stenciled rather than applying markers.
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5. Date and location of placement of new signs, marker application, or
stenciling will be recorded. The number of identified existing signs, and
number of new signs installed will be tabulated on a yearly basis for annual
reporting to ADEQ.
B-7
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Illicit Discharge Detection Procedures
APPENDIX A
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Marana Town Code
Marana's Town Code includes regulations that pertain to illicit discharge prevention. The
relevant sections of Code are as follows:
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Chapter 7: Building
Waste disposal (Section 7-5-2)
"Sewerage systems and/or septic tank systems shall be constructed in
accordance with the standards of the Arizona Department of Health Services ar
the Pima County Health Department, with compliance with such standards to be
certified by the appropriate state or county agency or the town engineer."
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Chapter 10: Health and Sanitation
Dumping and Transportation of Garbage or Aggregate Material
(Article 10-1)
A. "It shall be illegal to transport garbage, refuse, and aggregate material or like
material within the town limits in an open vehicle unless the material is in a
closed container or in an enclosed cargo area."
C. "No vehicle shall be driven or moved on any roadway within the town limits
unless the vehicle is so constructed or loaded as to prevent any of its load
from dropping, shifting, leaking, or otherwise escaping there from, except that
sand may be dropped for the purpose of securing traction, or water or other
substances may be sprinkled on a roadway in cleaning or maintaining the
roadway. "
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Illegal dumping (Section 10-1-3)
"person who dumps, deposits, places, throws or leaves refuse, rubbish, debris, filthy
or odiferous objects, substances, or other trash on any town road, public
thoroughfare, public airport, the right-of-way to a town road, public thoroughfare or
public airport within twenty (20) yards of a town road, public thoroughfare or public
airport is guilty of a class three (3) misdemeanor."
"The governing body of the town shall cause signs to be erected at suitable intervals
on roadways, public thoroughfares, public airports, and rights-of-way within the town
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limits, including pul:Dlic parks, informing the public that is unlawful to commit the acts
prohibited by this section."
F. "The town manager shall enforce the provisions of section 10-1-3 by
prosecuting violators in the Marana Municipal Court pursuant to the
provisions of the code. If such prosecution fails to secure compliance with the
provisions of said sections, or in the event of inability to prosecute violators
by reason of failure to secure jurisdiction over their persons, the manager
shall compel the removal of litter by the procedure outlined in article 10-2 of
the Marana Town Code."
Litter on private premises or public place (Section 10-2-2)
"No person shall dump, throw or deposit litter on any public place or private premises
within the town, whether owned by such person or not, except that the owner or
person in control of private premises may maintain authorized private receptacles for
refuse in such a manner that litter will be prevented from being carried or deposited
by the elements upon any public place."
Owner to maintain premises (Section 10-2-3)
"The owner or person in control of any private premises shall at all times maintain the
premises free of litter, provided that this section shall not prohibit the storage of
refuse in suitable containers."
Notice to remove (Section 10-2-5)
"To compel the removal of litter through the provisions of this article, if a person
owning or controlling any private premises fails, neglects or refuses to remove or
properly dispose of litter located on private premises owned on controlled by such
person, he or she shall be given written notice by the manager to remove all litter
from such private premises within thirty days from the date set on the notice for
compliance..."
Removal by town (Section 10-2-8)
"When any person to whom a notice to remove has been given, and on or before the
date of compliance on the notice or within such further time as may have been
granted by the council on appeal, fails, neglects or refuses to move from such private
premises any or all litter, the manager is authorized and directed to cause same to
be removed and disposed of at the expense of the owner or person controlling such
private prem ises. . . "
Sewage Sludge - Residential areas (Article 10-3-1)
"The use of land within the town that is within one-quarter mile of a human residence
that is also within the town for the application of or injection of sewage sludge to the
surface or within eight inches of the surface shall be prohibited, except where said
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residence is owned by the owner of the land where sludge is to be applied or injected
or where written waiver has been obtained from the resident or owner of the
residence and where said waiver has been filed with the town clerk."
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Sewage Sludge - Flood plain areas (Article 10-3-2)
"The use of land within the designated flood plain of the Santa Cruz River as defined
by the town zoning ordinance or development code for the application of or injection
of sewage s'udge within eight inches of the surface shall be orohibited."
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Sewage Sludge - Other areas (Article 10-3-3)
"The use of any other land within the town for the application of or injection of
sewage sludge to the surface or within eight inches of the surface shall be in
accordance with star~1rds and regulations of the United Statl Environmental
Protection Agency, tl Arizona Department of Health Services and the Pima County
Health Department..."
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Travel Reduction Code - rpose (Section 10-4-1)
"The purpose of this article, recognizing that motor vehicles are the single greatest
contributor to air pollution, is to improve air quality and reduce traffic congestion
within the incorporated and incorporated areas of Pima County by increasing
alternate mode usage and reducing overall motor vehicle travel for commute trips
This article shall establish a basis for cooperative effort of the local jurisdictions to
achieve a uniform program for reduction of work related trips by employees working
for major employers subject to this regulation."
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Requirements for employers (Section 10-4-5)
"In each year of the regional program each major employer shall:
Provide each regular employee with information on alternative mode options and
travel reduction measures including, but not limited to: Sun Tran bus routes and
scriedules, the Rideshare program, and bicycle routes. This information will also be
provided to new employees at the time of hiring..."
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Chapter 14: Water
Service lines, valves and meter (Section 14-3-6)
".. . The customer's lines or piping must be installed in such a manner as to prevent
cross-connection or backflow."
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Escaping water (Section 14-10-3)
"No person shall allow water to escape from his or her premises upon public
property, such as alleys, roads or strt: lS, nor upon any other person's property."
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1 996 Spa/Pool Code
The Pima County 1996 Spa/Pool Code was adopted by the Town of Marana, with
amendment. Discharges from pools and spas are regulating under this code
according to the following provisions:
Waste Water Disposal (Sections 314,415,508, 616, 714, and 815)
"Backwash water shall be disposed of and contained on site. All discharges of
backwash water shall comply with applicable Pima County ordinances and Arizona
Department of Environmental Quality (ADEQ) Engineering bulletins..."
Town of Marana Land Development Code
The Town of Marana's Land Development Code regulates a wide range of actions that
would result in illicit discharges into the storm drainage system or would otherwise
negatively impact surface waters. The relevant sections of Code are as follows:
Title 5: Zoning
Zone D - Designated Flood Plain Zone (Reference 05.02.04)
A. "Within Zone D no residential land use shall be permitted, nor shall any
commercial, industrial, or quasi-public use be permitted that entails the
accommodation of persons overnight or the storage of materials or equipment
for more than 24 hours if such materials or equipment would become
hazardous to human health and safety upon exposure to water, or if such
materials or equipment would result in a hazardous contamination of the Santa
Cruz River or Brawley Wash..."
B. "No construction or excavation that will alter the natural drainage pattern,
direction or rate of flow, or the carrying capacity of the Santa Cruz River or the
Brawley Wash can be performed unless previously approved by the Town
Council after recommendation from the Planning Commission."
Drainage of Surface Waters (Reference 05.05.04)
"No surface water shall be allowed to drain from any lot onto any adjacent lot except
upon written agreement between the owners of said lots"
Pollution Prohibited (Reference 05.02.05)
"No land use shall be permitted which emits or discharges liquids or solid material on
the soil or into surface or ground waters in amounts which result in pollutants
entering any water or drainage system in amounts exceeding the standards
prescribed by those Pima County; Arizona (sic), or federal agencies having
appropriate jurisdiction."
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Recreational Vehicle (Reference 05.10.10)
H.11. "All parks and subdivisions shall have refuse collection areas approved by the
Planning Administrator..."
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Resort and Recreation Zone (Reference 05. 11.07)
O. "Each property shall provide adequate and accessible trash disposal
areas.. ."
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Light Industrial (Reference 05.12.02)
I. 7 "All outdoor trash and refuse storage areas shall be enclosed..."
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Heavy Industry (Reference 05.12.03)
H.8 "All outdoor trash and refuse storage areas.. . shall be enclosed..."
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Title 8: Building Code
Drainage of Lots (Requirement 08.03.03)
"Surface water shall not be allowed to drain from any lot onto any adjacent lot,
parcel, or easement except upon written agreement with the owner of said adjacent
lot, parcel, or easement."
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Waste Disposal (Requirement 08.03.09)
"Sewerage systems and/or septic tanks shall be constructed in accordance with the
standards of the Arizona Department of Health Services and the Pima County Health
Department... "
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Title 11 : Prohibition of Illegal and Nuisance Uses
"The purpose of this section is to promote the health, safety, economic, aesthetic, and
general welfare of the citizens of the Town of Marana.. .by establishing requirements
for the maintenance of all land. .."
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Nuisances Prohibited (Requirement 11.02)
B. "No person shall compost or permit the composting of organic waste; manure;
tree, grass, or shrub clippings; grease; bio-solids, or other similar material on any
property within the Town of Marana limits except for composted material that is
used directly on the property from which it is com posted."
D. "No person shall allow a grease pond or open grease storage facility to be
maintained on any property within the Town of Marana limits."
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Title 17: Environmental Resource Preservation, Native Plant Protection,
Landscape Requirements
Protected Ridges, Protected Peaks, Riparian Areas, Wildlife Corridors and
Areas of Significant Vegetation (Section 17-1-1)
D. "All areas determined to include riparian or wildlife linkages and corridors shall
be protected and remain undisturbed throughout the course of development
and shall be fenced-off during construction."
Landscape Requirements: Intent and Objectives (Section 17-3-2)
"This chapter will utilize landscaping to achieve the following goals and objectives...
helping control and utilize storm water runoff...
control soil erosion..."
Title 21: Flood Plain Erosion Hazard Management Code
Short Title (Reference 21.01)
8.3. "The Town will acquire by appropriate means, and whenever possible, lands
within the regulatory floodway, floodway fringe and erosion hazard areas.
These lands are to be managed to preserve or enhance natural values and
expressed resource management goals."
B.5. "Natural flood areas, streams, washes, arroyos, rivers, and drainage courses
are, whenever possible, to be preserved in their natural riverine environment.
Any land use proposal which proposes this approach will be considered
superior to all others."
C. "It is the purpose of this Code to protect the public health, peace, safety,
. comfort, convenience and general welfare of the citizens of the Town of
Marana by adopting regulations designed:
1. To minimize flood and erosion damage and reduce the heights of floods...
2. To prevent unwise encroachment and building development within areas
subject to flooding...[and] erosion, and to assure that the flood carrying
capacity within the altered and/or relocated portion of any watercourse is
maintained."
Floodway Requirements (Reference 21.08)
B.1. "Extraction of sand, gravel, and other materials is allowed within the floodways
and flood hazard areas provided that excavations are not so located nor of such
a depth, or width, or length, or combination of depth-width-Iength as to present a
hazard to structures..., to the banks of watercourses, to other property, or which
adversely affects groundwater recharge."
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B.2. "There shall be no stockpiling within the floodways and flood hazard areas of
materials or tailings that may obstruct, divert, or retard the flow of floodwaters
except as reviewed and approved by the Town Floodplain Administrator on an
individual Floodplain Use Permit basis."
B.3. "Excavations may be allowed only in those reaches of water courses which have,
at a minimum, a balanced sediment system, i.e. the sediment coming into the
reach is equal to or greater than the sediment leaving the reach and the long
term sediment balance for the river system indicates that the stream channel will
aggrade."
B.4. "Due to the rapidly changing hydraulic characteristics of watercourses in the
Town of Marana, and the effects excavations have on these characteristics,
Floodplain Use Permits for excavations shall only be renewed for a limited time
period, not to exceed one (1) year, subject to annual renewal upon review by the
Town Floodplain Administrator."
B.5. "In addition to those conditions provided for elsewhere, floodplain use permits for
excavations may impose conditions regarding the area and location in which
excavations are allowed, the maximum amount of material to be excavated, and
other reasonable restraints on the methods of operating, including time
restraints."
B.6. "Any extraction of sand and gravel or related materials in a flood way or flood
hazard area will only be allowed after the effective date of this Code if a
reclamation plan is also provided for the extraction operation. The reclamation
plan shall show in sufficient detail the actions which are proposed to reclaim the
excavated areas so that all adverse effects of extraction are mitigated."
C. "No use shall be allowed which:
1. Acting alone or in combination with existing or future uses creates a danger or
hazard to life or property...
4. Increases erosion potential upstream and/or downstream.
5. Places a waste disposal system wholly or partially in a floodway.
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Floodway Fringe Area Requirements (Reference 21.09)
B.1.a. "Any fill proposed to be deposited in the flood way fringe must be shown to have
some beneficial purpose and the amount thereof not greater than is necessary
to achieve that purpose, as demonstrated by a plan submitted by the owner
showing the uses to which the filled land will be put and the final dimensions of
the proposed fill or other materials."
B.1.b. "Such fill or other materials shall be protected against erosion by riprap,
vegetative cover, bulk heading, or other approved methods."
B.3.a. "The storage and/or processing of materials that are buoyant, flammable,
explosive or that could be injurious to human, animal, or plant life in time of
flooding is prohibited."
B.4.a. "All new and replacement water supply, treatment, and sewage collection and
disposal systems built in a regulatory floodplain shall be designed to eliminate
to the degree physically possible, in accordance with Arizona Department of
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Environmental Quality guidelines, infiltration of floodwaters into these systems
and discharge from these systems into flood waters."
BA.b. "On-site sanitary waste disposal systems shall be located to avoid impairment to
them or contamination from them during flooding."
B.6. "In order to minimize erosion and sedimentation in the run off from the Tortolita
mountains, native vegetation shall not be removed from that part of the Town of
Marana East of 1-10 except where the Town Engineer has approved the
methods to control erosion, sedimentation, flow and related factors..."
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.,-, _._-,~,._-"~,~._~.", '~"--'_"__'"'''''''''''''''"",~,"",,,,",,__~__,_'''m''__
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Outfall Inspection Report
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Datil: Time: Structure 10 /I
Location:
Comolaint /I NJA Photo 10 /I
New Photo
Taken: V.. No liVes: Photo 10/1
existing
slglUlfJS: V.. No Sign Lengusge:
Upstrum
Lend_: R..ldential Commercial induslrisl Undeveloped
IWeather: ITempersture_'F Sunny
Reining: V N Imminent
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Cloudy
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Outfall DescrlDtion
I Swcwre I
Type: Box culvert
f!.Il!.;..
Coneretll
Metal
Dip
Spillway
Other:_
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Size: (Diameter or Dimenslone):
No
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Yes:
Estimate Flow Velocity: Light (Suspended silt, clay & small sand size)
Medium (Sand size pertlcle movement in suspended
Heavy (Bed load movement - rocks. gravell
No
Ponded
Water: Yes No
Odor of
Discharge: None Sewage Sulfide Rancid or Sour Oil or G..
ather Odor:
None Veilow Brown Green Grey
Other:
Nane Cloudy Opaque Other:_
None 011 Sheen Sewage Trash Other:_
None Sediment Oily Other:
Normal Excessive Deficisnt Deformod
NatIve
W..ds Vsgetation Other:
Samples
taken: Yea No Semolino Method:
Site. Tested If -V....:Teetina
Sample: Ves Na ~
ITrash: !!!!!!!!J!;.
Yea No If -Ves": TVD8:
Action Taken.
'continue on back)
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Town of M.rana
lIIicllllis_IlIe Outfall Inspection Report
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Town of Marana
File#:
COMMUNITY RESPONSE TRACKING REPORT
Date:
Name:
Street Address:
City/State/Zip:
Nature of Call &
Complete Detail:
Home Phone:
E-mail:
Fax #:
Work Phone:
Name/Dept. of
Person Taking
Report:
LOWER SECTION FOR TOWN OF MARANA USE ONLY
For Response Referred
To:
Response Required-By
Date:
Town of Marana
Research &
Resolution:
Response to Citizen:
Further Action
Suggested:
';'Note .. Hiidt Discharpe repents rTlUf)t be ~mh:~stipatf:~d vvithn 4B hours,
Reaction by Citizen:
File Auth:
Dept:
Date:
Direct this form to DSC Administrator's secretary for initial processing & assignment
c
Appendix C
Citizen Concern Procedures
Notice of Violation Letters (NOV)
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MARANA
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TOWN OF MARAN'"
PLA.l'lNING AND ZONL'iG DEPARTMENT
CODE ENFORCEMENT PROCESS FOR CITIZEN COMPLAINT
DATE:
SOP:
Purpose and Intent:
To establish a process in which to address a citizens complaint and insure compliance
with all applicable code requirements in a timely manner.
Policy:
When a citizen's complaint is received by or referred to the Zoning Code Compliance
Officer it must be responded to in a timely manner, typically within two business days.
The appropriate documentation and research must be done to determine if a violation
exists and to insure compliance when a violation is found as described in the following
procedure.
Definitions:
NIA
Procedure:
When a complaint is received by a citizen or as a referral by another department an
evaluation ""ill be made at that time to determine whether it would fall under the
jurisdiction of the Town of Marana's Land Development Code or whether it should be
referred to another department. !fit is detennined to be a valid zoning complaint, a case
file will be opened through Code Trak: our computerized tracking system. Each new case
is given its own =e number. All actions taken such as site inspections, verbal and
written notices, court actions, and any other case related activity will be entered under
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that case number. First action would be to locate and ;t the property owner and lor
tenant and infollI1 them either with a verbal or a wnL :otice desc;:ibing the violation
a!9ng with the specific code reference. Ifno action'to COLect the violation occurs within a
reasonable period of time, typically (7) days, the legal process will begin. Three written
notices must be issued before any legal action can b~ taken. The Inspector must send a
first, second and third notice certified with return rec equested, After each notice is' ,
sent they are given a time period to comply, lJpically \ (14) days. If the violation has
been resoh'ed within that notification process time penal!, the case will be closed. If t::tat
process has been completed. and the violation still exists, the case wi!! then be tu:l1ed
over to the Town Atto:ney and the court process will begin. A citation may be issued, a:1C
civil or crk-linal penalties may be imposed by the magistrate for each day the violation
conti:1Ucs to exist.
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MARANA
~/l~
TOWN OF MAIlANA
Development Services - Plan.rring and Zoning
Zoning Code Enforcement
3696 West Orange Grove Road
Tucson,~ 85741
(520) 297-2920
CERTIFIED 11.ill NO. (<MaiL1\I0>)
RETlJR..N RECEIPT REQUESTED
(<Date>>
((Compan)'>)
(<Address 1))
((Cit)'>>, <<State>> <<Postal Code>)
FIRST NOTICE OF VIOLATION
It has come to our attention that the property located at <<Propeny Address>) is reponed to
be in violation of the- Town of Marana Code, ((CodeAnicleViolated>> in regard to the
following:
<NiolationA)>
<NiolationB)>
For questions, please contact me at (520) 297-2920 to discuss this matter. If we do not
receive a response from you within seven (7) days of your receipt of this letter, a re-
inspection of the reported violation will be conducted and legal proceedings, if required,
will commence.
Thank you for your cooperation in this matter.
Sincerely,
Holly Orloff
Zoning Code Compliance Officer
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MARANA
~/ l'"
TOWN OF MAllANA
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Development Services - Planning and Zoning
Zoning Code Enforcement
3696 West Orange Grove Road
Tucson,.~ 85741
{520) 297-2920
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CERTIFIED Mill NO. <<MaiINo>>
REn..R~ RECEIPT REQUESTED
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<<TodaysDate>>
<<CompanyName>>
({/I,ddress 1>>
<<Cit)'>>, <<State>> {<PostaICode>>
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SECOND NOTICE OF VIOLATION
You were contacted 'on <<FirstContactDate>> in regard to violation(s) of the Townoi
Marana's Codes specifically stated, which is/are <(CodeArticleViolated>> ,<violatioll.-\.>>
((ViolationB>>
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To date there has been little, if any, progress that has been made to mitiga~ said
violation(s). It is our policy to attempt to work with and assist citizens in correcring
violations prior to pursuing legal remedies. You are hereby required to remove and'or
eliminate the violation(s) on your property within 14 days of receipt of this Ie:;:;::.
Enforcement action was initiated with the first letter that was given to you dared
(<FirstContactDate>>.
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Please do not hesitate to contact me at (520) 297-2920 if you have any questions
regarding this matter.
Sincerely,
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Holly Orloff
Zoning Code COlllpliance Officer
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MARANA
~/ 1 '"
TOWN OF MARAN"
Development Services - Planning and Zoning
Zoning Code Enforcement
3696 West Orange Grove Road
Tucson,PlZ 85741
(520) 297-2920
CERTIFIED MAIL .'10. <<..lv1ailNo))
RETUR.~ RECEIPT REQUESTED
<<TodaysDate))
<<Compan)'>)
<<Address 1>)
<<Cit)'>), <<State)) <<Postal Code))
FINAL NOTICE OF VIOLA TION
You were notified on two previous occasions, by letters dated <<FirstViolationDate)) and
<<SecondVio]ationDatc)), which specified the violation(s) of the Town Code.
Tne code violation(s) is/are as follows:
<<violation.."v) <<violationB))
Failure on your part to remove and/or eliminate the violation(s) of the TO\\ll Code within
14 days of receipt of this letter shall result in a citation being issued to you for the
violation(s) noted and requiring you to appear in court to answer the charges. Civil
penalties range from 5500.00 to $1,000.00 fines being imposed for each code violation
and a like amount f9r each day the violation(s) continue to existing after judgment by the
magistrate. Criminal penalties can be imposed for a 90-day period for each violation, and
a like period for each day the violation(s) continue to exist after judgment by the
magistrate.
It is the policy of the TO\Yll of Marana to resolve issues such as these prior to initiating
legal action. Therefore, it is in your best interest to contact our office and schedule a
meeting prior to the end of this final notice period so that we may assist you in complying
with the Town Code.
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Appendix 0
Town of Marana Land Development Code - Title 19
Grading Checklists- Type I and Type II
Residential and Commercial Permit Checklists
Foro1 A - Major Utility Installation permit
Form B - Public Improvement Dedication to Town permit
Floodplain Use Permit
Elevation Certificate
Building Permit Application
D
TOWN OF MARANA, ARIZOt-.iA
LAND DEVELOPMENT CODE
TITLE 19
STANDARDS FOR GRADING AND RELATED SITE WORK
SECTIONS:
19.010
19.020
19.030
19.040
Purpose and Interpretation
Applicability and Exemptions.
Definitions.
General Grading and Related Site Work Performance
Standards.
19.050 Submittal and Procedures: Type 1
19.060 Submittals and Procedures: Type 2
19.070 Inspection and Performance Defaults.
19.080 Enforcement and Penalties.
19.090 Waivers and Interpretation Review.
19.100 Illustrations.
HILLSIDE DEVELOPMENT
19.010
A.
B
Purpose and Interpretation
Purpose
1. The purpose of this Title is to protect the public health, safety, general
welfare, and aesthetics by regulating grading and related site work
(including initial clearing, brushing or grubbing, subsequent excavating or
filling, and related site work) on private and public land, including land
owned by the Town of Marana.
2. It establishes standards designed to:
a. Regulate the development of potentially hazardous terrain;
b. Conserve the general visual character of sites and settings;
c. Enhance the value of new development; and
d. Conserve the value of existing affected properties.
3. The guidelines and standards of this Title have been prepared in the
context of Town of Marana specific desert environment. They are intended
to complement the applicable provisions of development code and other
Town ordinances.
4. Granting of a permit for grading and related site work shall not relieve the
applicant of responsibilities to other jurisdictions.
Interpretation.
1. This section shall be used as a guide whenever a conflict arises in the
interpretation or enforcement of this Title. The design, implementation, and
mitigation of grading and related site work regulated by this Title (19) shall
be reviewed by the Town of Marana staff prior to the issuance of any permit
1-,.., .........~. 'r.... "^"""'...Ii................. ,uO+h .h,.., ...., ,;A~li...~C' ,...f +hie Ti+lo ~"I"'I +ho C!'no,..ifi,...
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TOWN OF l\1ARANA, ARIZO:-.lA
LAND DEVELOPMENT CODE
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2.
The design and implementation of all grading and related site work shall;
a. Minimize scars and other adverse visual impacts resulting from cut
and fill;
b. Blend with the natural contours of the land;
c. Conserve the natural scenic beauty and vegetation of the site, and;
d. Restrict the area and volumes to the minimum necessary to
implement the planned development.
In all projects, measures shall be taken to:
a. Ensure that graded hillside, slopes, or other areas sub,. ..: to
erosion are stabilized;
b. Reduce the erosion effects of stormwater discharge, preserve the
f1oodway-carrying capacity of natural or constructed wa!p.rways by
limiting soil loss, and protect drainways from siltation;
c. Minimize dust pollution and surface water drainage from graded
areas during grading and development; and
d. Ensure that development activity is designated and implemented to
minimize adverse impacts and include appropriate restorative
measures.
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19.020
A.
Applicability and Exemptions.
Scope
1. All development projects shall reCdlre either a Type 1 or a Type 2 grading
permit, except as exempted in subsection D of this section.
Town development projects shall abide by the requirements of this Title.
The Town Council may grant a special exception at a public hearing to a
requirement of this Title for a Town deveiopment project.
Type 1 permit applicability: A Type 1 permit is required for:
1. Residential development on a single lot, with a development envelope not
exceeding the following:
Lot Area
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0.5 to 5.0 acres (21,780 to 217,800 sq.ft.)
5.0 acres and more
Development Envelope
12.000 sq. ft. plus 9.5% lot area
15.0% lot area
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Residential development on a single lot of less than one-half acre, with a
development envelope of more than twelve thousand square feet.
Non-residential developmer' ;,n less than 1.0 acre, or which does not
require a subdivision plat or 210pment plan.
The clearing, brushing, or gruobing of an area within the limits given in (B)
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TOWN OF MARANA, ARIZONA
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5. Temporary off-site stockpiling of between one hundred cubic yards and ten
thousand cubic yards of fill.
6. Grading -- except when reviewed during a golf course review, a floodplain
review, or a Type 2 grading permit review process - which requires a
permanent cut or fill slope greater than five feet in height and steeper than
a 3:1 slope.
7. New pavement of three thousand to five thousand square feet.
C. Type 2 permit applicability: A Type 2 permit is required for:
1. esidential development on a single lot with a development envelope
exceeding the following:
Lot Area Development Envelope
0.5 to 5.0 acres (21,780 to 217,800 sq. ft.) 12,00 sq. ft. plus 9.5% lot area
5.0 acres and more 15% lot area
Residential development which requires a subdivision plat or development
plan.
Non-residential development on one or more acres, or which requires a
subdivision plat or development plan
The clearing, brushing, or grubbing of an area exceeding the standards of
subsection (C)(1) above.
5. Temporary off-site stockpiling of more than ten thousand cubic yards of fill.
6. New pavement of more than five thousand square feet.
Exemptions: The following activities are exempted from this Title.
1. Residential development on a single lot, with a development envelope of
less than fourteen thousand square feet.
One subsequent expansion, by not more than twenty-five percent, of an
exempted or approved Type 1 graded area.
The clearing, brushing, or grubbing of an area of less than fourteen
thousand square feet.
Temporary off-site stockpiling of less than one hundred cubic yards ofill.
Resurfacing or maintenance of an existing paved surface.
New pavement of less than three thousand square feet.
Single-home sewage disposal system with a County Health Department
permit.
Excavation below finished grade for a basement, foundation, wall or
swimming pool authorized by a building permit.
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19.030
A.
Exploratory excavation under the direction of a soil engineer or engineering
geologist, provided all excavation is properly backfilled in accordance
with Town of Marana standards.
Qualified archaeological exploration of a registered archaeological site.
Removal of no more than 25 percent of the individual plants for storage and
replanting on the some property. This provision shall not exempt clearing,
brushing, or grubbing.
Underground utility installations under a paved roadway surface or a
continuously-maintained unpaved roadway surface and which provide no
disturbance of the surface.
15. Grading for the maintenance of an existing private access, road or
driveway, provided that it either existed prior to adoption of, or was
established in conformance with, this Title. Proof of such may be required
by the Town of Marana
16. Grading for an appurtenant access or utility easement.
17. Grading for nonnal agricultural practices on or within existing areas of
agricultural use.
18. Excavations for specific buildins: foundations which are permitted by
issuance of a building permit.
19. Projects in the floodplain which are authorized under a specific floodplain
permit.
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General usage: The definition and usage of terms in this ~ ~ are as contained
within this code, except that the definition and usage of termb .Jescribing drainage
are as contained within the Marana Floodplain Management Ordinance.
Definitions: For purposes of this Title only, the following words and terms shall
mean:
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Access road: A road within one mile of the grading site, designed on the
approved grading plan, and used, during grading, for the transport of
grading equipment, hauling of fill and other equivalent vehicular traffic to
and from the grading site.
Approval: Written notice by the Town of Marana staff approving the design,
progress or completion of work. A copy of which will be filed in the office of
the Panning and Zoning Administrator.
Approved plan: The most cur.rent grading plan which bears the authorized
signature of approval of the Town of Marana staff.
Approved testing agency: A facility which is equipped to. perform and
certify the tests required by this Title and whose testing operations are
controlled and monitored by a Registered Civil Engineer.
Borrow: Earth material acquired from an off-site location for use in grading a
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6. Brushing: The selective removal of vegetation.
7. Building height contour line: A contour elevation line set at the existing
grade elevation, plus the maximum building height permitted by site
rezoning conditions of this code and fifty percent of the additional height
added by permitted fill. Referto illustration (19.100A.1).
8. Clearing: The substantial removal of vegetation.
9. Development Project: Any man made change to improved or unimproved
real estate including but not limited to buildings or other structures, mining,
dredging, filling, grading, paving, and excavating.
10. Envelope, building:
a. A dwelling unit and all attached roofed structures, including carports
or patio ramadas;
b. For non-residential development, the building envelope shall be the
main building and all attached roofed structures.
11. Envelope, development The total are encompassed by a continuous line
drawn a minimum distance of five (5) feet outside any and all work shown
on the approved plan and any other surfaces which will be disturbed (as
access roads). There shall be no more than one envelope per permit
unless such envelopes are separated by an undisturbed distance of at
least 1 00 feet.
12. Erosion: The wearing away of the ground surface as a result of the
movement of wind, water or ice.
13. Excavation: The artificial (e.g. mechanical, manual, blasting, etc.) removal
of earth materials.
14. Final inspection: Field inspection conducted by the Town of Marana prior
to project acceptance or release of assurances (if required).
15. Grade: The vertical location of the ground surface.
16. Grade, existing: The actual, current ground surface as of the date of
adoption of the ordinance adopting this Title.
17. Grade, finished: The final grade conforming to the approved grading plan.
18. Grade, rough: The stage at which grading substantially conforms with the
approved grading plan.
19. Grading: The initial clearing, brushing, or grubbing, and subsequent
excavating or filling, of a site.
20. Grading permit: An official document issued by the Town of Marana staff
authorizing the grading and related site work activity specified by the permit
conditions.
21.
22.
Grubbing: The removal of trees and other large plants by their roots.
Inspector: A person authorized by the Town of Marana to perform
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19.040
A.
Permit conditions: The specificatio"''' and requirements of the approved
grading plan, grading statemer oils report, or other documents
necessary for permit approval.
Related site-work: Work other than general, or mass grading which
involves (1) below-the-surface operations (such as trenching for utilities or
landscaping); (2) placing of pavement and its substructure; (3) curhs,
gutters, and sidewalk; (4) grading of drainage channels; and (5)
constructing minor slope protection facilities and retaining walls
Retaining wall: A wall designed to withstand lateral and hydrostatic
pressures and built to keE>>o earth from sliding, and which is two feet or
greater in height from tt .vest point of earth at the foundation to the top
of the wall.
26. Revegetation: Placement of living plant material on sites or cut and fill
slopes where the natural vegetation has been removed.
27. Site: Any lot or parcel of land, or contiguous combination of lots and
parcels under the same ownership, or unified control, where grading or
related site work is to be performed.
28. Slope: An inclined ground surface, the inclination of which is expressed as
a ratio of horizontal distance to vertical distance.
29. Soil: Naturally occurrinG "eposits overlying bedrock.
30. Stabilized slope: A slope treated with revegetation or other mitigation
measures approved by the Town of Marana that contribute to resistance to
erosion of siltation or to structural strength of the slope.
31. Temporary stock-piling: The storing of a quantity of material for not more
than 90 days. A revised period may be accepted by the Town Engineer, at
his discretion when the permit is issued, and shall determine the expiration
date.
General Grading and Related Site Work Performance Standards.
Scope: The performance standards of this section are general grading and related
site work performance requirements. Illustrations (see 19.100) elaborate on
minimum performance standards referenced by this section and may include non-
regulatory guidelines for superior grading performance
Site revegetation and stabilization: All graded areas that have not been
revegetated, stabilized, or constructed upon at expiration of the permit shall be
subject to an additional fee and an amended permit and shall be revegetated or
stabilized within 60 days of the expiration date of the original permit.
Slopes: All exposed cut or fill slopes shall be revegetated or stabilized in
accordance with the approved grading plan.
Terracing: Terracing to control surface drainage and debris on cut or fill slopes
may be required.
Fill: Fill shall be compacted and soil-tested in accordance With Town of Marana
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F. Setbacks: The following minimum setbacks shall be increased by the Town staff if
considered necessary for safety or stability, or to prevent possible damage from
water, sailor debris:
1. Terraces: The width of a terrace shall be a minimum of six feet.
2. Buildings: Buildings shall be set back from the toe and crest of a slopes in
accordance with this Title, the Town of Marana building code, or the
approved soils reports, whichever is greatest.
3. Rights-of-way: The required setback of a slope toe adjacent to a public
right-of-way may be reduced with the approvai of the Town of Marana staff,
if there will be no adverse effect and:
a. Easements are not required; or
b. Retaining walls are used.
G. Building height: The finished grade and building pad shall be established so that
the maximum building height shall not exceed the building height contour lines.
H. Drainage control systems:
1. Permanent control systems:
a. Erosion control shall be constructed and maintained to prevent
erosion of slopes, and cleared, brushed, grubbed, or graded areas,
in accordance with the approved grading plan and Town of Marana
standards.
Where cut slopes are not subject to erosion due to the erosion
resistant character of the native materials, erosion control may be
omitted upon approval by the Town of Marana.
Erosion control devices to prevent erosion or sediment deposition
on off-site property may be required,
The shoulders of a paved public or private roadway shall be
protected against erosion whenever curbing or constructed
spillways are not provided.
Surface drainage:
(1) Cut and fill slopes shall be provided with approved surface
drainage for stability and erosion protection of affected
properties.
(2) Approved surface drainage interceptors shall be provided at
the top of cut and fill slopes where there is surface runoff
and erosion potential.
(3) Approved drainage slopes to protect foundations shall be
provided.
Subsurface drainage: Subsurface drainage for stability and
protection of affected properties from ground water seepage may
be.reauirednILlhe TownnfMarana stafL____
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2. Interim systems: Approved interim drainage control systems shall be
provided.
Import and export of earth and materials:
1. Loading of earth material shall occur only within the time limits of
subsection J of this section, and dust palliatives shall be applied as may be
required by the Town of Marana staff.
2. The transportation of earth material on public right-of-way shall be in a
manner that minimizes blowing soil and other hazards.
Hours of construction:
1. Construction equipment operation within one-half mile of an occupied
structure shall not be conducted between sunset and seven a.m.
2. Normal equipment maintenance involving lights, motors or generators, and
occurring within six hundred feet of an occupied structure, shall not be
conducted between nine p.m. and seven a.m.
3. Town of Marana staff may allow equipment operation or maintenance
during other hours if such operations are not detrimental to the health,
safety, or welfare of the inhabitants of the structure.
4. Permitted hours of operation or maintenance may be shortened by written
notice, if the Town staff finds a substantial adverse effect on the health,
safety, or welfare ot the surrounding community.
Restrictions of vehicles:
1. No vehicles shall be driven over "natural open space areas", as designated
on the approved grading plan.
2. Points-of-entry to the site during construction shall be only as designated on
the approved grading plan.
3. For Type 2 permits, access roads to the site during construction shall be
only as designated on the approved grading plan.
Additional requirements:
1. During construction, and until revegetation or stabilization has taken place,
dust shall be minimized through application ot approved dust controls as
may be required be Town of Marana staff.
2. Public rights-ot-way, sidewalks, and other improvements shall be
maintained during construction in a neat and clean condition, free of loose
soil, construction debris, and trash.
3. Debris, fill, or equipment shall.not be stored within a public right-of-way
without the written approval ofthe Town of Marana.
4 Cut or fill material in excess of that allowed by the permit shall be disposed
of in an approved manner.
Removal of native vegetation. In order to minimize erosion and sedimentation in
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has approved the methods to control erosion, sedimentation, flow and related
factors and their implementation is assured by a mutual consent agreement
between the Town and the applicant signed and guaranteed by cash or a bond
acceptable to the Town Attorney in an amount set by the Town Manager to
guarantee perlonmance of the provisions of the mutual consent agreement (Ord.
91.19,1991).
19.050 Submittal and Procedures: Type 1
A. Scope: An application for a Type 1 permit requires a completed permit application,
grading plan, and grading statement. A survey sealed by a registered land
surveyor is not required.
B. Grading plan requirements:
1. The existing and proposed finished grade of the area to be graded, based
on spot elevations or one-foot contour interval maps;
2. The extent of graded areas, shaded and labeled "graded area", and, where
structures are to be constructed:
a. The existing grade at the primary building corners and proposed
finished floor elevations; and
b. The proposed building heights, shown to be within the building
height contour line;
3. The location of proposed mitigative measures, such as revegetation or
retaining walls;
4. The exterior boundaries of the site;
5. Access roads and points-of-entry to the construction site;
6. The grading envelope.
C. Grading statement: A written grading statement shall be submitted with an
application for a permit. The Statement shall include, where applicable:
1. A description of stabilization, erosion, and drainage control measures;
2. The off-site disposal location and estimated quantity of earth material and
vegetation to be removed from the site during construction;
3. Estimated starting and completion dates;
4. A description of the dust control method to be used during construction and
until revegetation or stabilization has been completed.
D. Documents preparation:
1. Documents shall be prepared in accordance with the requirements of this
Title and other Town of Marana standards.
2. Infonmation shall conform to the specific plan, rezoning conditions (where
applicable), and other applicable regulations.
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Application:
1. The permit application, grading plan, and other required materials shall be
submitted for review to the Town of Marana.
2. The permit application shall be completed and signed by the owner or
authorized representative.
3. Fees are payable to the Town of Marana in accordance with the fees
schedule adopted by the Town of Marana.
Application review:
1. The grading plan and statement shall be reviewed for consistency with
applicable regulations and standards, and if approved, a permit shall be
issued within five working days of application.
'2. If determined inadequate, the application shall be retumed within five
working days and the owner may resubmit, without additional fees, an
amended grading plan or statement.
3. If a second additional submitted is required, it shall be accompanied by a
fee equal to one-half of the initial fee.
4. The Town of Marana shall require that plans and specifications be modified
to make them consistent with this code or other applicable regulations. A
permit may be issued with additional conditions.
Permit issuance and expiration:
1. Issuance: Permits are issued by the Town of Marana. A copy of the permit
and approved grading plan shall be kept in an easily accessible location on
the site.
2. Expiration: A permit shall be null and void if the authorized work has not
been completed within six months of permit issuance.
Permit extension and reapplication:
1. Extensions: Upon written request by the permit holder, the Town of Marana
may approve a single time extension of a permit for up to 90 days.
2. Reapplication: Reapplication for a permit may be made in accordance with
this Title.
Changes to permit:
1. Hazardous conditions: If drainage problems, flood hazards, or other
potential hazards become known that were not considered at the time the
permit was issued, the Town of Marana may require that engineering
modifications be submitted in a report and that the designed be modified
2. Nonhazardous conditions: If unanticipated nonhazardous conditions are
encountered during construction and are beyond the scope of the permit,
the permit holder may submit the necessary engineering modifications in a
report to be reviewed and approved by the Town of Marana.
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19.060
A.
Submittals and Procedures: Type 2
Scope: An application for a Type 2 permit requires a completed permit application,
grading plan, grading statement, and soils report. Where applicable and not
otherwise submitted, drainage improvement plans shall be required also.
Grading plan requirements:
1. The existing and proposed finished grade contours (except as amended in
subdivision 2 of this subsection) of the area to be graded, at a minimum of
two-foot contour intervals for slopes up to fifteen percent. Slopes over
fifteen percent shall be identified clearly and labeled.
2. The development envelope, showing the extent of graded area, shaded and
labeled "graded area". and, where structures are to be constructed:
a. Spot elevations may be shown for the finished grade within the
building envelope;
b. All building pads, showing the existing grade at the primary building
comer and proposed finished floor elevations: and
c. The proposed building height, shown to be within the building height
contour line.
3. The general topography for one hundred feet, or as specified by the Town of
Marana, outward from sites greater than five acres: The Town may
detemnine that such information is necessary for smaller sites.
4. A description of the mitigation methods, specifying elevations, dimensions,
qualities and locations. to be used during grading and until revegetation or
stabilization has been completed.
5. The exterior boundaries of the site, the bases of bearing and a benchmark
to establish the vertical datum.
6. The extent and manner of preserving, relocating, clearing and disposing of
vegetation.
7. The final ground cover, revegetation (if any), erosion control and proposed
methods for cut or fill stabilization, based upon the soils report (refer to
subsection C ofthis section).
8. Access roads, haul routes, and points-of-entry to the construction site.
9. Where drainage improvement plans have not been submitted separately or
where interim drainage conditions exist because of project phasing, plans
for:
a. Drainage or other pro\ective devices to be constructed as part of the
grading;
b. The drainage area and estimated runoff of the area served by
drains.
A general description of potential paleontological, archaeological or
histaricaLres~~nd Dronosed JDitiaation_measures:. .or ~c1earance
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11. The off-site disposal location and estimated quantity of earth material to be
moved from the site during construction.
12. Estimated starting and completion dates for each construction phase. For
superior project design and construction performance, it is encouraged that
the project designer prepare for project design use an existing site
inventory, identifying and quantifying vegetation, soils, on-and-off site view
shed constraints, slope analysis, and drainage.
Soil report:
1. The report shall contain all geotechnical engineering information and
recommendations applicable to the project, and shall be sealed by the Soils
Engineer prior to submittal.
2. The Civil Engineer responsible for preparing the grading plan shall
incorporate all report recommendations into the plan and statement.
3. Approved report recommendations shall become conditions ofthe permit.
Documents preparation:
1. Documents shall be prepared in accordance with the provisions of this Title
and standards of the Town of Marana.
2. Information shall conform with rezoning conditions and other applicable
reguiations.
3. Grading plan preparation: The plan shall be prepared by, or under the
direction of, a Registered Civil Engineer.
Application:
1. The permit application, grading plan, and other required materials shall be
submitted to the Town of Marana for distribution to the applicable Town of
Marana review agencies.
2. When desired, a letter of request to exercise the inspection certification
option (refer to Section 19.0708) shall be submitted with the application.
3. The permit application shall be completed and signed by the owner or
authorized representative.
4. Fees are payable to the Town of Marana in accordance with the fees
schedule adopted by the Town.
5. At the discretion of the Town of Marana, assurances may be required in
accordance with Section 19.070E (Subdivision Standards).
Application review:
1. Grading and related site work plans and related submittals shall be review
concurrent with the tentative plat or development plan review process for
the project.
2. Plans and reports shall be reviewed for consistency with applicable
regulati~ns ~~d. s~and~~~.~n~v.'ittl~th~!?pro~e~, r=zoni~g sil~a~.~~i~~f___
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G.
3. Written review comments shall be provided to the applicant within twenty
working days of each submittal or resubmittal. Two submittals are covered
by the initial fee, An added fee of 50% is required with third submittal.
Preliminary grading:
1. Preliminary grading approval: A preliminary grading permit for clearing,
brushing, grubbing, preliminary excavation, of filling may be issued in
special circumstances at the discretion of the Town of Marana while the
grading plan is being reviewed, provided:
a. The Town of Marana finds that the proposed grading is consistent
with this Title and code, the submitted grading plan, and the
approved tentative plat or reviewed development plan;
b. The Town of Marana finds that the proposed grading will not have
an adverse effect on the grading project and surrounding area;
c. Preliminary grading shall occur no less than twenty feet from the
boundaries of the development envelope, exclusive of approved
points-of-entry; and
d. Preliminary grading assurances have been provided in accordance
with subdivision 2 of this subsection.
2. Preliminary grading assurances;
a. lNhen approval has been granted for preliminary grading, grading
assurances shall be posted in an amount not to exceed the
approved preliminary grading cost estimate made by a Registered
Civil Engineer.
b. The assurances shall be applied only to:
c, Eliminate potential hazardous conditions; or
(1) Mitigate the effects of dust, drainage, erosion, visual scars or
hazardous conditions, in accordance with the approved
designed.
(2) The assurances shall be released by the Town of Marana
when the preliminary grading has been inspected and
received the written approval of the Town of Marana. Final
approval of a permit shall not require the release of the
assurances in the event of preliminary grading
noncompliance.
Permit issuance and expiration:
1. Issuance: Permits shall be issued by the Town of Marana no earlier than at
the time of Town of Marana written staff approval of the tentative subdivision
plat or development plan. A copy of the approved permit with plan shall be
kept in an easily accessible location on the site.
2. Expiration: A permit shall be null and void if the authorized work has not
_ been comoletedwitbinJ)[\e .lIear atnermitissuance..______
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Permit extension and reapplication:
1. Extensions: Upon written request by the permit holder, the Town of Marana
may approve a single extension of a permit for up to 180 days.
2. Reapplication: Reapplication for a permit may be made in accordance with
this Title.
Changes to permit:
1. Hazardous conditions: If drainage problems, flood hazards, or other
potential hazards became known that were not considered at the time the
permit was issued, the Town of Marana may require that engineering
modifications be submitted ir a report and that the grading design be
modified.
2. Nonhazardous conditions: If unanticipated nonhazardous conditions are
encountered during constructions and are beyond the scope of the permit,
the permit holder may submit the necessary engineering modifications in a
report to be reviewed and approved by the Town of Marana.
Inspection and Perfonnance Defaults.
General Inspections:
1. All construction which requires a permit shall be inspected by the Town of
Marana in accordance with the permit:
a. The inspection schedule shall be prepared in advance and approved
by the Town of Marana. Fees shall be based on the inspection
schedule and payable to the Town of Marana. Fees shall be based
on the Town of Marana in accordance with the fees schedule
adopted by the Town.
b. The permit holder shall request inspection at least two full working
days prior to the anticipated need.
2. If the Town of Marana finds site conditions are not a s stated in the
approved permit conditions, the Town of Marana may order work authorized
be the permit to stop until a revIsed grading plan has been approved.
3. Whenever grading work requiring Town of Marana inspection is concealed
by additional work without finst having been inspected, the Town of Marana
may require, by written notice, that such work be:
a. Exposed, for inspection by the Town of Marana, or, at the option of
the Town of Marana,
b. Certified by the project Registered Civil Engineer as being in
conformance with applicable regulations.
Inspection certification option:
1. Upon approval by the Town of Marana, the owner may retain a Civil
Engineer, registered to practice in the State of Arizona, to:
a.___ _Perform the reauired.construction insDection~__...
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19.070
A.
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B.
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D-14
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TOWN OF MARANA, ARIZONA
LAND DEVELOPMENT CODE
Certify, upon completion, that the construction has been performed
and completed in accordance with the permit conditions, the
approved plans and specifications, and with applicable Town of
Marana standards.
The owner shall submit, in writing, to the Town of Marana, a request to
invoke this option. The request shall name the proposed Civil Engineer and
present his qualifications.
The Town of Marana reserves the right to either accept or deny the request.
If the request is to be granted, the owner and the engineer shall execute a
written agreement, on a from to be supplied by the Town, clearly
enumerating the responsibilities of all parties to the process.
The Civil Engineer shall make periodic reports to the Town as construction
progresses and shall maintain records for filing with the Town at completion.
The Town of Marana may periodically inspect the work and will monitor the
progress. The Town of Marana will conduct a final inspection upon
receiving notice of completion and will release all parties from the permit
only after all provisions of the permit and the agreement have been
complied with.
The owner, in receiving a permit for construction, shall guarantee all work
accomplished under the permit for a period of at least one year following
acceptance of the project and release of the permit.
Final inspection of rough grade:
1. All rough grading shall be completed in accordance with the permit prior to
final rough grade inspection by the Town of Marana.
The final inspection shall be conducted by the Town engineer prior to
issuance of a certificate of substantial conformance or release of
assurances (if required). The permit holder shall produce a minimum of
forty-eight hours' notice to the Town of Marana when any phase of rough
grading is ready for final inspection.
The Town of Marana may approve completed rough grading prior to
completion of related work in cases of extreme hardship or where grading
has been designed to be completed in phases, provided that no hazards
exist and a performance bond has been posted to ensure completion of
remaining construction work of that phase.
The soils report and certification of substantial conformance shall be
submitted to the building official prior to issuance of a building permit.
Final inspection:
1. All required construction work shall be completed in accordance with the
permit prior to final inspection by the Town of Marana and issuance of a
certificate of final approval.
2. Where the conditions of a permit include the establishment of vegetation or
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b.
2.
3.
4.
5.
6.
7.
C.
2.
3.
4.
D.
i
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D- 15
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TO\VN OF MARAK'I, i\RIZON/\
LAND DEVELOPMENT CODE
-
B.
Town of Marana shall make a post-construction inspection within six months
of permit expiration or as required by the permit.
E. Maintenance of revegetation:
1. Maintenance of approved landscaping and revegetated graded areas shall
consist of regular watering , pruning, fertilizing, clearing of debris and
weeds, the removal and replacement of dead plants, and the repair and
replacement of irrigation systems and architectural features.
2. Maintenance assuranceK The final approval of any subdivision plat or
development plan that Includes an approved final landscaping plan shall
require covenants or assurances which:
a. Ensure the continued maintenance of required landscaping,
buffering and associated irrigation systems; and
b. Assign the responsibility of maintenance to the property owner of
agent, a homeowners' association or other liable entity.
F. Compliance: Town personnel, qualified In landscape architectural review will
periodically spot-inspect landscape installations for compliance with this Title and
approved landscape plans
19.080 Enforcement and Penalties.
A. Permit enforcement:
1. The enforcement of this Title and conditions of the permit shall be in
accordance with this section.
2. When the Town of Marana staff determines a non-compliance with the
conditions of the permit, the Town of Marana shall issue a stop-work order
and hold in abeyance, by written notice, the Town of Marana review of other
submittals related to the development project and the issuance of Town of
Marana permits for any aspect of the development project until remedial
actions have received the written approval of the Town of Marana staff
Stop-work order:
1. Whenever the Town of Marana determines that grading does flot comply
with this Title of the permit conditions, or that the soil or other conditions are
not as stated on the permit, the Town of Marana may order the work
stopped by written notice served on any person engaged in doing or
causing such work to be done.
2. Any such person shall immediately stop such work until authorized by the
Town of Marana to proceed with the work.
Penalties:
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c.
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1.
Failure to obtain permit: Unless exempted by this Title (refer to Section
19.0200), failure to obtain a permit prior to commencement of grading shall
be a violation of this code. However, the Town of Marana may issue an
exception permit if the Town of Marana finds that an emergency existed
which maru>..jtjmno=ihlP.fir<:t tnahtam...a.."...rmit
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D- 16
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TOWN OF Mi\RANA, AIUZONA
LAND DEV.ELOPlvW"J'l' CODE
19.090
A.
2. Violations: A violation may result in issuance of a stop-work order, and
penalties may be assessed in accordance with the Town of Marana
Development Code. A violation of this Title shall also constitute a Class 1
misdemeanor. Payment of any fines or penalties shall not relieve any
person from otherwise complying with the requirements of this Title. Each
and every day that a violation of this Title exists shall be deemed to be a
separate offense.
Waivers and Interpretation Review.
Waivers:
,,,""....
Scope: A waiver from a provision of this Title may be granted by the Town
of Marana staff when the strict application of the provision would require
work by the permit holder detrimental to the purposes of this Title and cause
an unnecessary hardship to the property owner.
Standards: A waiver shall not be granted unless:
a. The waiver is the minimum necessary to afford relief;
b. The waiver will not be materially detrimental to the rights of owners
and residents of other affected properties; and
c. The waiver is in harmony with the intent, the purposes, and the
provisions ofthis Title from which the waiver is requested.
Conditions: Conditions may be imposed on a waiver that will:
a. Secure the intent, the purposes, and the provisions of this Title from
which the waiver is granted; and
b. Provide adequately for the protection of surrounding property
owners and residents.
Application: The request for a waiver shall be made on a form provided by
the Town of Marana staff and shall be heard within thirty days. Fees shall
be paid in accordance with the fees schedule adopted by the Town of
Marana.
5. Notice and Review: Notice of the application and the hearing shall be
mailed to all property owners within 300 feet of the site and shall be posted
at the Town's official notice positions. The Town Manager shall hold a
hearing on the waiver request and render a decision within five (5) working
days thereafter.
6. Appeal: Within fifteen (15) days of receipt of a notice of decision from the
Town of Marana, the applicant may file an appeal for a hearing by the Town
Council.
1.
2.
3.
4.
"
B. Interpretation review:
1. Scope: Upon request by an affected person who believes there has been a
misinterpretation, the Manager of the Town of Marana shall review an
interpretation of a provision of this Title made by a Town official.
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D- 17
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TO\li;'N OF M..'\RANA, 1\
LAND DEVELOPME.\l'
'\
_7
19.100
Illustrations.
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Building Height Contour Line
maximum zoning
bullcllnl he1lht
mlna. ,./2
dllht
tine
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Comparison or Slopes
.lope. no S'U:.tCf than 3:1
n:qulre rcvt!gt!tation
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atee.p slopel
over 3:1 require.
mechanIcal lubU1z.IUon
iI!I"!f;
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D- 18
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TO\VN OF MARANA, ARIZONA
LAND DEVELOPMENT CODE
HILLSIDE DEVELOPMENT
(Outline 8/29/91)
A. PURPOSE
The mountains and foothills in and around Marana are a valuable scenic resource which
should be preserved. Dominant peaks and ridges should be protected and the
intensity of development regulated according to the natural characteristics of hillside
terrain such as slope, vegetation, landform, soil stability and drainage pattern.
B. REVIEW REQUIRED
All subdividing and development which occurs in any lot or parcel containing protected
peak and ridge areas designated by the Council and in any lot or parcel containing
slopes of fifteen (15) percent or greater, requires a review and compliance with this
Code. Until approval of a plat or plan or permit is granted, no grubbing, grading
excavation or construction is to occur. A non-refundable fee established by Town
Council resolution shall accompany a review request.
C. STANDARDS
The following standards apply to lots and parcels affected by this section:
1. Any lot or parcel created must meet slope/size/density pertable one (1). All
development is subject to a 300 foot setback from each protected peak or
ridge designated.
AVERAGE NATURAL
CROSS SLOPE
(%)
Less than 15
15-15.9
16-16.9
17-17.9
18-18.9
19-19.9
20-20.9
21-21.9
22-22.9
23-23.9
24-24.9
25-25.9
26-26.9
27-27.9
28-28.9
29-299
30-30.9
31-31.9
32-32.9
33- and greater
,"
MINIMUM MAXIMUM
AREA DENSITY
(ACRE) (Dwelling units/acre)
AS PERMITTED BY ZONING DISTRICT
1.00 1.00
1.00 1.00
1.25 .80
1.37 .73
1.50 .67
2.00 .50
2.25 .44
2.50 .40
3.50 .29
4.50 .22
6.00 .17
7.00 .14
8.60 .12
10.40 .09
12.80 .08
16.00 .06
23.50 .04
31.00 .03
36.00 .027
A TII,..c:nn r\A\/Alt"\of'\l"'r"IiCItoP"\+ ~+!2r"1ti::a"""" II ::atc.c:t \/c.rci"n' Q M Qh~11 ha I rhli.,,~
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D- 20
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TOW!\: OF MARANi\, /\RIZOJ'{:\
LAND DEVELOP1VIENT CODE
-,
B.
1. Buildings are limited to a building height of twenty-four (24) feet. All
exposed exterior walls and roofs of structures are recommended for earth
tone colors to blend in with the predominant natural colors found on the lot
or parcel.
2. All utilities and services shall be underground.
3 Roads and drives leading to lots shall be located to minimize scarring, be in
low visibility view areas and maximize the retention of natural vegetation.
CERTIFICATION
....
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The developer and/or property owner will be responsible for the following:
1. Submitting sloped area analysis certified by an Engineer, registered In the
State of Arizona, for review and verification by the Town Engineer.
Submitting a grading plan prepared by an Engineer, registered in the State
of Arizona, complying with the standards, for review by the Town Engineer.
Surveying, staking, and inspection of the lot or parcel by an Engineer,
registered in the State of Arizona, to determine compliance with this Code
and the conditions of approval.
On site enforcement by certifying to the Town Engineer, that the
development complies with the Code during the period of construction.
DESIGNATION/AMENDMENT OF PROTECTED PEAKS OR RIDGES:
1. The Town Council designates a peak or ridge for protection by the
established of a 300 foot setback from each peak or ridge. Peaks or ridges
designated for protection must:
a. Have been designated by Pima County as a protected peak or ridge
prior to annexation by the Town, or
b. Be significant in relationship to the surrounding property, or
c. Be highly visible from the lower elevations, or
d. Form a silhouette against the sky when viewed from a scenic route,
No designation or amendment shall be acted upon until a publiC hearing has been
held.
1.
2.
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3.
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4.
C.
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D.
The Planning Commission may notify the 300 foot setback from a protected
peak or ridge if they find that the requests meet the following conditions:
a. The proposed development is for a single family residence.
b. The only area to graded within the protected peak and ridge setback
area is for a building pad and access to the building.
Have the highest portion of the structure not higher than twenty (20)
feet below the elevation of the peak or ridge
Have no more than six (6) feet of the external portion of the structure
exposed except at points of ingress and egress.
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c.
d.
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D- 21
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TOWN OF !\1ARANA, ARIZOKA
LAND DEVELOPMENT CODE
e. All exposed exterior walls roofs and retaining walls are
recommended earth tone color to blend in with the predominant
natural colors and all glass surfaces shall be designated to not
reflect beyond the lot or parcel boundaries.
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D- 22
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PERMIT NO ISSUED.
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PERMIT APPLICATION FOR MINOR GRADING
TYPE I GRADING PERMIT
Date of Application: I Building Permit No,: I Floodplain Permit No,:
Project Address:
Applicant: I Telephone: I Fax:
Address, City, State & Zip:
Description of Work: (In Accordance with Title 19, Town of Marana Land Development Gode and Resolution 90-05}
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CONDITIONS MET AND APPROVED ,. .'
k Grading Conditions Applicable for Type 1 Permit: IIYES
B, Site Plan meets checklist requirements: . IJYES o 4 sets
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C, Grading Statement in accordance with Title 19: ,YES
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D, Cost Estimate for site improvements LYES Value:
E, Contractor Licenses: ------- D Insurance (owner acting as contractor)
CJ State License D Town of Marana Business
_....._~------- , --
F, Floodplain Permit: DYES D Not Applicable
-=--=---~-----------:------'
G, Special Inspection Certificate: nYES n Not Applicable
L-H.:. Right-of-Wax.J:.e!~it: eYES [] Not Applicable
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I PERMIT FEES -...----...--
! Base Fee Amount $100,00
I Plans Check Fee $17500
Inspection Fee (Greater of 2% of Cost Estimate for site improvements-or $300) $-
TOTAL FEES DUE
Check No Receipt No, $
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Wor1< performed under thiS permij shall comply with the Town of Marana Standards, Regulations, ReqUlrements and Federal Permits,
Contractor:
Address, City, State & Zip:
: State
: License No.
Telephone:
Fax:
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State License
Expires On:
Town of Marana Business Town License Expires On:
License No,
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Applicant's Signature:
Owner's Name
~-------
~ner'~~~nature_~
Accepted for the Town of Marana By:
I Dale of Issuance
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D-23
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Conditions for Type 1 grading permits
The conditions shown on the type 1 grading permit insure that a grading permit
complies with Title 19 of the Land Development Code. This is an explanation of
the items required and reviewed.
A. Grading conditions Applicable for Type 1 Permit:
From Title 19, the conditions applicable to a Type 1 Permit are:
1. Residential development on a single lot with a development envelope
not exceeding the following:
Lot Area Development Envelope
0.5 to 5.0 acre (21,780 to 217,800 sf) . . . 12,000 sf plus 9.5% of lot area
5.0 acres and more. . . . . . . . . . .. .....15% of lot area
2. Residential development on a single lot of less than one-half acre, with
a development envelope of more than
twelve thousand square feet.
3. Nonresidential development on less than 1.0 acre, or which does not
require a sub-division plat or development plan.
4. The clearing, brushing, or grubbing of an area within the limits of Item 1.
5. Temporary off-site stockpiling of not more than ten thousand cubic
yards of fill.
6. Grading--except when reviewed during a golf course review, a
floodplain review, or a Type 2 grading permit review process--which
requires a permanent cut or fill slope greater than five feet in height and
steeper than a 3:1 slope.
7. New pavement of three thousand to five thousand square feet.
;.
B. Site Plan meets checklist requirements.
A 36"x24" site plan shown at a standard engineering scale is submitted to
be reviewed. A site plan checklist is attached to this document. All items
applicable to a given site should be shown on the site plan. In addition,
the checklist shows BOLD items for each category. These items are
considered key items and are given a cursory review at the time of permit
submittal to insure a complete submittal. This cursory review is performed
by a member of the subdivision engineering division. Incomplete
submittals will not be accepted by subdivision engineering personnel.
TL-.;....:......'" i................. .1.-....... .......:~...~ ..._~ ~~_~;&...I_ __-' _;.._ .L.._ ___1:___... .:~_.._
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D-24
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correct major deficiencies as soon as possible and not wait for a review of
the plans. If a subdivision engineering employee is not available and the
plan is submitted anyway, it could impact review time. Every effort is
made to insure that at least one person from subdivision engineering is
present during working hours, including lunch.
-
C. Grading statement in accordance with Title 19.
....
A written grading statement shall be submitted with an application for a
grading permit. The statement shall include, where applicable:
a. A description of stabilization, erosion, and drainage control measures.
b. The offsite disposal location and estimated quantity of earth material
and vegetation to be removed from the site during grading.
c. If offsite disposal location is other than a public disposal site, provide
copies of permission agreements from affected property owners for
said disposal.
d. Estimated starting and completion dates.
e. A description of the dust control method to be used during grading and
until vegetation or stabilization has been completed.
."..
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....
The grading statement, except for item c, can be accomplished by general
notes on the site plan. It should be noted that the Town of Marana has
specific requirements for slope stabilization:
1. Slopes 3: 1 or shallower shall be revegetated (or use clean
landscape rock)
2. Slopes steeper than 3:1 but shallower than 2:1 shall be covered
with rock riprap over filter fabric.
3. Slopes 2:1 and steeper shall have grouted riprap, earth
retaining walls, or retaining walls as appropriate.
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D. Cost Estimate for site improvements
-
The permit fee for the Type 1 permit includes a portion that is a
percentage of the cost of site improvements. Prepare a cost estimate or
obtain a cost estimate from your contractor for the site improvements
including the following:
a. Site prep/clearing and grubbing
b. Stormwater Pollution Prevention Plan (SWPPP) devices to
control erosion in accordance with your grading statement
c. Earthwork cut, fill, trenching, import, and watering
d, Driveway materials and construction
e. Drainage improvements such as culverts and low water
crossings
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D-25
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Items associated with a building permit are to be excluded from site costs.
Cost estimates will be reviewed and compared to comparable grading
permits.
E. Contractor Licenses
Your general contractor will need to provide a copy of his state
contractor's license and Town of Marana business license. Owners
acting as their own contractor will be required to secure a homeowner
builder insurance policy for the construction of the home. The minimum
liability coverage for this policy shall be $100,000 and the Town of Marana
shall be named an additionally insured on the liability policy. This
insurance policy takes the place of the bonding and insurance carried by
general contractors.
F. Other Permits
A floodplain permit is required for structures or grading within the
floodplain or erosion hazard setback areas on a property. A native plant
permit is required for clearing native vegetation from the planning and
zoning department. A Right of Way permit is required for work within the
Town of Marana right of way; such as driveway connections, utility
trenching, and access through public drainageways and across no access
easements. Staff will guide you through these additional permits.
G. Special Inspection Certificate
A special inspection certificate is required to have the homesite pad
grading certified for compaction. This certification is required for the
building permit but is made a part of the grading permit as that is when the
work is performed. The building department has a listing of certified
inspectors.
Other Considerations
The Town of Marana does not enforce HomeOwner's Associations or
Architectural Review Committee's requirements. It is incumbent upon the
applicant to insure HOA acceptance and/or compliance. The granting of a
permit to grade by the Town of Marana does not constitute HONARC
approval.
D-26
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Revised (8-24-05)
Effective (9-22-04)
P.ub1ic Works Department
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TOWN OF MARANA
MARANA MUNICIPAL COMPLEX
11555 W. Civic Center Drive
MARANA, ARIZONA 85653-7090
Type I Gradine: and Floodplain Residential Site Plan Checklist
-
(Engineering Seal and Signature may be required for Town of Marana Acceptance)
-
1. GENERAL INFORMATION
-Property Owners Name and name of consultant if applicable
-Legal Description - Either lot with subdivision book and page or metes and bounds with seclion
number. Show assessor's Parcel Number
-Type of Marana Land Use Zoning
-Project location - sketch of adjacent lots and roadways
-Legend of symbols used
-Property size, total area of grading, percentage of grading, percentage of Natural Undisturbed
Open Space (NlJOS)
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2. GRADING INFORMATION
-North arrow, bar scale and vertical Datum used for all elevations
-Existing topography (labeled I foot contours witb symbology differeOl from proposed)
-Erosion Hazard Setback Line and 100 year Floodplam if applicable with building setbacks.
-Limits of grading, show all cut and fill slopes around the property & grade breaks, show spot
elevations (especially at building corners) and proposed contours as needed to depict proposed
grading.
-Drainage !low direction and drainage improvements, including swale detaIls
-Location of allY proposed underground utilities. If the utility crossed a watercourse the depth of the
utility below the watercourse must be indicated.
-Driveway paved in accordance with Land Code 22.090. Show slope of driveway and elevation of top of
curb @ driveway
-A special inspection certificate for the soil/grading of the site. Pnor approval of a special inspeetor(s)
for soil/grading is required prior to issue of the grading permit
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.",.
3. FLOODPI,AIN INI;ORMATlON
-T)'pe of FEMA wning with panel nnmber, effective date and LOI\IRs if applicable
- Show 404 limits, QIOO Water Surface Elevations, EHSL, FEMA and locally regulated floodplain
-Bank Prote<:tioll. Bank Protection must be in conformance with State Swndard SS7-98.
(SS7-98 Compliance statement must be included on site plan)
oDepth of E roSl 011 iTl alld Tlcar a waler course and depth of toe downs 1('r huildlllg pad" driveways and
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D-27
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Revised (8-24-05)
Effective (9-22-04)
Public Works Department
4. RIGHT OF WAY INFORMATION
-Property boundaries with dimensions, setback lines, and found property pins
-Adjacent property ownership (lot numbers if same subdivision or assessors parcel numbers)
-Existing and proposed public and private utility easements and dimensions
5. BUILDING INFORMATION
oOveraJl dimensions of existing/proposed building(s) and distances to property lines
oFinished Floor Elevation(s)
-Fence, patio walls and/or retaining walls witb location and spot elevations at top of wall, bottom
of wall and ground elevation of retained earth.
oUtility routing, sizes, and materials including Sewer or septic tank with latentl location
o Number of parking spaces provided (label the garage)
oProvide the rim elevation (top of manhole) of the nearest upstream sanitary manhole.
-Venting. Details of venting of fully enclosed, nOD-babitable areas below the Regulatory Flood
elevations designed to equalize bydrostatic flood forces on exterior walls by allowing for the entry
and exit of floodwaters in accordance witb guidelines of tbe National Flood Insurance Program
Regulations 44 C}'R !l60.3. Non-habitable areas below the Regulatory Flood Elevation are to be
solely for vehicle parking or storage. This does not include proposed basements, which are not
allowed in a floodplain.
6. LANDSCAPE INFORMATION
oLocation of all existing large and protected plant species which arc to remain or be removed
7. ADDITIONAL INFORMATION REQUIRED FOR PERMIT ISSlJANCE
oGrading statement in accordance with Land Code 19.050C
oltemized cost estimate for all site civil work including site prep, SWPPP measures, earthwork,
drh.eway, and drainage improvements. If a cost estimate is not available at the time of submittal, the
base fee and plan check fee will be collected. Cost estimate and remaining fees will be required prior to
permit issuance.
8. OTHER ITEMS THA T MAYOR MAY NOT BE REQUIRED
oBuilding permit required for retaining walls (either separate permit or as part of overall building permit)
oFloodplain permit required for structures or grading within the 100 year water surface elevation,
Erosion Hazard Setback Line (EHSL), or FEMA floodplain
eRigbt-of-Way permit required for construction in Town right-of-way. such as driveway cOlmections,
utility trenching, or access to public drainageways and across no access easements
-Hydrology report may be required for structures or grading within floodplain or EHSL
-Residences within the habitat of the Pygmy Owl are advised to contact Fish and Wildlife
Items in Bold are "quick check" key elements that will be looked at during submittal to determine
overall completeness of site plan. Site plans failing to address these key elements will be returned
without review and without fees being collected.
J'......
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D-27
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PERMIT APPLICATION FOR CONSTRUCTION OF PUBLIC IMPROVEMENTS IN THE TOWN OF MARAN A
TYPE II GRADING PERMIT
-
Date of Aoolication: I PERMIT NO. ISSUEDl
Project Name:
Project Location/Address:
Description of Work (In accordance with Title 19, Town of Marana Land Development Code and Resolution 90-05):
..
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o The permit includes private streets.
Applicant/Owner
Contact Name - -
Address
City I State I Zip I
i
Telephone No. I Fax No.
i
Applicant's (If Applicant is not the Owner, the Applicant guarantees they are acting on behalf of the Owner)
Signature
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Contractor
Contact Name
Address
City I State Zip I
Telephone No. Fax Number
State License No. Expiration Date I
I
Town Business Expiration Date I
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D-28
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PERMIT NO.
For Official Use Only
',.", ")L,", ." ,";'jf8'l)' PERMIT FEES", "", "', ,. "','
',.
Base Fee $100.00
Construction Cost Fee --.-
Greater of $500,00 $
OR ~
Construction Cost $
1 % of Construction Cost - An agreement for inspection of public
improvements has been executed. and Applicant hereby agrees to retain $
an Engineer of Record and pay the costs of all tests of materials and
performance as reQuired by the Town Engineer,
OR
Construction Cost. $
3 ]1% of Construction Cost - An agreement for inspection of public
improvements has been executed. and Applicant hereby agrees to retain
the Town of Marana or his/her designated representative as an Engineer $
of Record and pay the costs of all tests of materials and performance as
required by the Town Engineer.
. At the Town's Discretion
AT-RISK Grading Fee $500.00
Violation Fee (Double permit fee) $
TOTAL FEES DUE $
Check No. Receipt No.
Work performed under this permit shall comply With the Town of Marana Standards, Regulations, ReqUirements and Federal Permits.
Bond Amount
Re-seeding Bond
Cost: $0.05 per sq ft of area Area
Performance Bond $
Cost of retuming the site to the previous condition plus 15% Contingency
Construction Cost: $ Contin enc : $
TOTAL FEES DUE
Check No. Receipt No. $
Bond No,
Accepted for the Town of Marana By:
Date of Issuance:
A COpy OF THIS PERMIT SHALL BE ON THE JOB AT ALL TIMES.
D-29
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PERMIT NO.
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TYPE II GRADING PERMIT: SUBDIVISION AND/OR DEVELOPMENT
In consideration of mutual covenants herein contained, and for other good and
valuable consideration, the receipt of sufficiency of which is hereby acknowledged by each
party to the other, this AGREEMENT, made and entered into this _ day of
,20_, by and between the Town of Marana, a municipal corporation,
hereinafter called the Town, and:
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Name
Address
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City, State, Zip Code
-
hereinafter called the Applicant
WITNESSETH:
....
WHEREAS, the Applicant desires to make improvement(s) within +he Town of Marana,
Arizona at:
...
proJe... Name (as depicted on the plans)
Location
-
Legal Description of the Property
on private lands within the corporate limits of the Town of Marana which includes land
that will be improved upon and may be dedicated to the Town of Marana as public rights-of-
way, easements, or other areas that will become property of the Town of Marana after
acceptance and dedication. (If the project is within a subdivision, the map or plat is recorded
in the office of the Pima County Recorder in Book _ of Maps and Plats at Page _
th~UAOf)' ,::mrl
....'
-
-
-
-
'"
D-30
-
PERMIT NO.
WHEREAS, the required reports, plans, specifications and soil tests for said work have
been approved by the Town Engineer or his/her designee, and the officials of the appropriate
water and wastewater, or other agencies, as applicable; and
WHEREAS, the Applicant desires that the Town approve the construction of said
improvement(s); and
WHEREAS, the Town is willing to approve said improvement(s), provided it/they meet
Town Standards and the work is completed in accordance with Town requirements; and
WHEREAS, the Town requires that such improvements, public or private, being
constructed within the corporate limits of the Town be constructed in accordance with Town
standards, regulations, and requirements;
NOW, THEREFORE, IT IS AGREED AS FOLLOWS:
1. We the undersigned, our successors and assigns, do hereby save the Town of
Marana, its successors and assigns, their employees, officers and agents harmless
and indemnify same from any and all claims for damage to persons or property
related to the improvements/installations as set forth in the accepted plans and
specifications first mentioned above, to the fullest extent permitted by law.
2. During the construction of said improvements, the applicant shall maintain policies
of liability insurance, issued by companies licensed to do business in Arizona, in
amounts not less than $1,000,000.00, and the Town of Marana shall be an
additional insured. The policy limit shall not be construed to limit the scope of
indemnity above.
3. That the Applicant, with the consent of the Owner, is acting on behalf of the Owner.
4. That the Applicant shall install and construct or cause to have constructed, at the
Applicant's sole expense, the improvements set forth in the plans and
specifications,
, which plans and specifications have been
prepared by a Professional Engineer registered to practice in Arizona, and which
have been reviewed and approved by the Town Engineer, as well as by the
appropriate owner/agency. Construction shall also comply with the conditions for
improvements as specified herein.
D-31
-
~
PERMIT NO.
5. That said approval to proceed with continuous and subsequent construction
elements shall be contingent upon the continuous compliance of contiguous work
elements. Compliance of work shall be documented on the Town Construction
Inspection Checklists and Project Materials Acceptance Checklist. The
documentation will be submitted to the Town for review and approval by the Town.
If at any time the Town determines that any portion of the work has been
performed in non-compliant manner with the governing plans, specifications, laws,
ordinances, Inspection Checklists, accepted Project Materials Checklist, standard
engineering practice or conditions of this permit, then a Stop Work Order will be
issued until the conditions are rectified to the satisfaction of the Town and that
compliance has been restored.
..
-
-
-
6. That said work shall be done in conformance to all applicable regulations, permits,
standards, and requirements of the Town; and that all required permits shall be
obtained by the Applicant prior to the commencement of any work under this
Agreement.
-
7. That a Professional Engineer, registered to practice in Arizona, shall be retained by
the Applicant as "Engineer of Record", and said Engineer shall layout and
establish the lines and grades for the work as it progresses, shall be responsible
for the surveillance of the construction, shall develop the Project Materials
Acceptance Checklist in conformance with the Town Materials Acceptance and
Testing Guide and shall order tests to verify the compliance of materials
incorporated into the work with the specifications. The Project Materials
Acceptance Checklist shall be submitted to and accepted by the Town prior to
issuance of said permit.
""'"
-
8. That a Professional Engineer, registered to practice in Arizona, shall be retained by
the Applicant as "Geotechnical Engineer of Record", and said Geotechnical
Engineer shall observe, test and inspect all construction operations, including but
not limited to: clearing, grubbing, subgrade preparation, structuraUtrench
excavation and backfill, aggregate base, concrete, asphalt, materials testing,
together with placement of fill. Said Geotechnical Engineer shall certify in writing
that all soils operations and materials used for this development were performed in
accordance with the recommendations as set forth in the Geotechnical
Investigation of Record and that all work, including all operations and materials,
used for this development are in conformance with the accepted plans and
specifications.
"'~
-
-
9. That a material testing company shall be retained by the Geotechnical Engineer of
Record.
IlOll!
10. That the Applicant shall be solely responsible for the cost of material tests required
by the Town as well as securing all applicable materials compliance documents
and certifications.
_i
-
-,
A
"'"
D-32
-
PERMIT NO.
11. That the Applicant shall notify, in writing, the Owners of all properties abutting the
periphery of the development. Notification shall include a description of the work,
the approximate dates the construction will take place, and a telephone number
and name of the individual to contact if further information is required. Notification
shall be accomplished a minimum of seven (7) calendar days prior to the
commencement of any construction activities. A copy of such notice shall be
submitted to the Town Engineer prior to distribution of said notice.
12. That the Applicant shall apply separately for a permit to haul, access, construct in
or otherwise use any public right-of-way, easement, or other area that is currently
owned by and the property of the Town before accessing, constructing in or
otherwise using such areas.
13. That in the event that the Town finds that adequate testing has not been performed
or that a closeout package it not being completed by the Engineer(s) of Record, the
Applicant shall pay any and all inspection fees as may be charged to the Applicant
by the Town.
14. That the work shall be subject to the inspection and the approval of the Town as
the work progresses. The Engineer(s) of Record shall provide at the end of each
month a written report as to the progress of the construction together with
inspection reports, materials test reports, Certifications of Compliance, an updated
Project Materials Acceptance Checklist, completed Town Construction Inspection
Checklists representing all work elements incorporated in the construction progress
to date and any other supplemental data pertinent to the work. This Monthly
Project Progress Report (MPPR) shall be submitted to:
Monthly Project Progress Report
C/O Subdivision Engineering Division
Town of Marana
11555 West Civic Center Drive
Building A2
Marana, Arizona 85653
MPPR's shall be submitted no later than the 7th day of the subsequent month (or
the nearest following working day). Should the Town not be in receipt of an
acceptable, complete MPPR by 12:00 noon on the 15t11 day of the month (or the
nearest following working day), then a Stop Work Order Notice will be issued until
compliance is verified that an acceptable, complete MPPR has been received by
the Town for the previous month's work.
15. That the Engineer of Record shall show all deviations from the approved plans on
the "As-Built" mylars of the plans. All changes or deviations in the approved plans
and/or specifications, other than those of a minor nature, shall be submitted to the
Town Engineer for review and approval prior to execution in the field.
D-33
-
-
PERMIT NO.
16. That the Town Engineer or his/her designated representative shall be present at
the final on-site inspection of the improvements. Prior to the final inspection by the
Town, the Applicant shall complete an on-site inspection with the Engineer(s) of
Record. Deficiencies in the work noted during the final inspection shall be
corrected to the satisfaction of the Town prior to approval of the improvement by
the Town and/or prior to release of assurances.
-
-
17. That within thirty (30) calendar days of the completion of construction, the Applicant
shall furnish the Town Engineer a closeout package that includes all applicable
items from Section 06-06 of Title 6 of the Marana land Development Code. A
certified listing of all items and quantities installed and associated costs will be
required to verify permit fees.
-
18. That the Applicant shall guarantee the work against defective materials or
workmanship for a period of at least one (1) year from the final acceptance of the
improvements by the Town. Upon discovery of defects, any repair or replacement
by the Town pursuant to said guarantee shall be undertaken immediately to the
satisfaction of and at no cost to the Town.
-
IN WITNESS WHEREOF, the Applicant has executed or has caused this Agreement
to be executed by its proper and duly authorized officer and the Town has caused this
Agreement to be executed by the Town Engineer or authorized representative as of the day
and year first written above.
.',
-
"'!.L\L, .OWN6A;'.TRIJSTHOLDatji)RAliIlI"HORIZED'AGENT.IAPPLICANT\: '",' ";e ,t i h '),,' i
Print or Type Company Name
Address
Telephone Number I Fax Number
Signature of Owner, Trust Holder Dale
or Authorized Acent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aoen!
"""
-
-
*',,,
-
-
-
"'"
,...,
D-34
-
PERMIT NO.
The terms and conditions of this Agreement have been read and are hereby agreed to
and accepted by the following:
00' vo.. 000' o' 'J:NGINEEFHlFRECORD: U ,.0 '0
Print or Type Company Name
Address
Telephone Number I Fax Number
Signature of Owner, Trust Holder Date
or Authorized AQent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aoent
..0000" ..u '0 . '. 000 : .:. J 0'" tGEO:racHNICALENGINEERoOFRECORD: ........00.0 .... .::.
Print or Type Company Name
Address
Telephone Number I Fax Number
Signature of Owner, Trust Holder Date
or Authorized ADent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aoent
0... :J:ONTRACJOIJ:
Print or Type Company Name
Address
Telephone Number
Signature of Owner, Trust Holder
or Authorized A ent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized A ent
Fax Number
Date
TowN OFMARANA:
D-35
~
-
, ..
..
-
-
RESIDENTIAL PERMIT CHECKLIST
Project Name:
-
D Preliminary Plat #: Date of Acceptance:
Other Departments (As needed)
D Planning Department
D CIP Division
D Environmental Engineering Division
D ROW Division
D Traffic Engineering Division
D CMID (Sydney - 682-3233) If permit is needed, a copy of the approved
permit is required prior to issuance of other permits.
-
--
Wo:""
D Sign-in Sheet
Owner/Developer's Info
D Letter allowing for another party to sign for the Owner/Developer
D NOI (not required if under an acre)
-
-
Contractor's Info
D Hold Harmless Documentation:
D Bond
D Certificate of Liability Insurance (Listing the Project Name and naming the Town
as additionally insured in the amount of 1 M dollar)
D Construction Cost Estimate (Fees will be determined by the Town)
Payment: Check #: Receipt #:
D State License #: Expiration Date:
n Town License #: Fl(nir~tinn n~tP..
-
-
-
.....",
-
.....
.-.'
D-36
-
.'0
o NOI (not required if under an acre)
o PDEQ Activity Permit
o ROW Permit Application (At the discretion of the Town)
EOR's Info
o SWPPP (not required if under an acre)
Number:
Date of latest submittal:
o 1 copy of the Town Approved SWPPP
o 3 copies of the Plan
D-37
Date of Acceptance:
Submittal # of the Plan:
-
-
,",
-
Grading Permit
o Permit #:
o Final Plat #:
Date of latest submittal:
D Grading (Grading & Drainage) Plan #:
Date of Acceptance:
Date of latest submittal:
o Private streets
o IP (Paving & Sewer) Plan #:
Date of Acceptance:
Date of latest submittal:
o Fees: Check #:
-
Date of Acceptance:
Submittal of the Plan:
-
Submittal of the Plan:
-
-
Submittal of the Plan:
Receipt #:
-
D Preliminary Grading
o Assurance: Total cost =
Re-seeding Bond =
= $0.05 per squa Coot.
a full grading pen;.Ii.
sq ft @ $
The bond will be returned upon receiving
....
o AT-RISK Grading
o Assurance: Total cost =
Re-seeding Bond = sq ft @ $
= $0.05 per square foot. The bond will be returned upon receiving
a full grading permit.
Performance Bond = +
= Cost of construction (grading only) + 15% contingency. The bond
will be returned upon recordation of the Third Party Trust and Final
Plat.
-
.....
-
o Grading without an Assurance
o Assurance: Total cost =
Performance Bond = +
= Cost of construction + 15% contingency. The bond will be
returned upon recordation of the Third Party Trust and Final Plat.
-
-
....,
-
...
-.
D-38
-
Form A
o Permit #:
o Permit #:
o On-site Water Plan #:
Date of latest submittal:
o Off-site Water Plan #:
Date of latest submittal:
o On-site Sewer Plan #:
Date of latest submittal:
o Off-site Sewer Plan #:
Date of latest submittal:
o Fees: Check #:
o PDEQ Water Notice to Construct
o PDEQ Sewer Notice to Construct
o 3 copies of Plans
Date of Acceptance:
Submittal of the Plan:
Date of Acceptance:
Submittal of the Plan:
Date of Acceptance:
Submittal of the Plan:
Date of Acceptance:
Submittal of the Plan:
Receipt #:
Form B (If it contains public streets)
o Permit #:
o IP On-site (Paving, Sewer & Drainage) Plan:
Date of Acceptance:
Date of latest submittal: Submittal of the Plan:
o IP Off-site (Paving, Sewer & Drainage) Plan:
Date of Acceptance:
Date of latest submittal: Submittal of the Plan:
o Fees: Check #: Receipt #:
o 3 copies of the Plan (if different from Type II Grading Permit)
D-39
..,.
-
. -"
-
......"
COMMERICAL PERMIT CHECKLIST
Project Name:
-
o Preliminary Plat #: Date of Acceptance:
Other Departments (As needed)
o Planning Department
o CIP Division
o Environmental Engineering Division
o ROW Division
o Traffic Engineering Division
o CMID (Sydney - 682-3233) If permit is needed, a copy of the approved
permit is required prior to issuance of other permits.
.....
o Sign-in Sheet
OwnerlDeveloper's Info
o Letter allowing for another party to sign for the Owner/Developer
o NOI (not required if under an acre)
o Certificate of Occu pancy Letter
-
J/I/ijiI,.,
Contractor's Info
o Hold Harmless Documentation:
o Bond
o Certificate of Liability Insurance (Listing the Project Name and naming the Town
as additionally insured in the amount of 1M dollar)
o Construction Cost Estimate (Fees will be determined by the Town)
Payment: Check #: Receipt #:
n Statp. L ir.p.n~p. #: Fxnir:=ltinn nFltP.-
...
.',
-
..,..
-'.
D-40
-
o Town License #: Expiration Date:
o NOI (not required if under an acre)
o PDEQ Activity Permit
o ROW Permit Application (At the discretion of the Town)
EaR's Info
o SWPPP (not required if under an acre)
Number:
Date of latest submittal:
o 1 copy of the Town Approved SWPPP
o 3 copies of the Plan
Date of Acceptance:
Submittal # of the Plan:
o Performance Bond for work done within the right-of-way (At the discretion of the
Town)
· Performance Bond =
+
= Cost of construction (in the ROW only) + 10% contingency. The bond will
be returned upon completion of the closeout package.
..-'
D-41
~ ,.>.......~..~...,"''''''"'"''..----_.~-'''"''''',."',,.,,"'
,-'
-,
Grading Permit
o Permit #:
o Development Plan #:
Date of latest f mittal:
o IP (Grading, Paving & Drainage) Plan #:
Date of Acceptance:
Date of latest submittal:
o Fees: Check #:
Date of Acceptance:
Submittal of the Plan:
-
Submittal of the Plan:
Receipt #:
-
o Preliminary Grading
o Assurance: Total cost =
Re-seeding Bond =
= $0.05 per square foot.
a fuff grading permit.
sq ft @ $
The bond will be returned upon receiving
-
o AT-RISK Grading
o Assurance: Total cost =
Re-seeding Bond = sq ft @ $
= $0.05 per square foot. The bond will be returned upon receiving
a full grading permit.
Performance Bond = +
= Cost of construction (grading only) + 15% contingency. The bond
will be returned upon completion of the improvement plans.
~
-
-
-
-
...,
-
"'*'m
-
D-42
~
Form A (only if any work needs to be dedicated to the utility companies)
o Permit #:
o Permit #:
o On-site Water Plan #:
Date of latest submittal:
o Off-site Water Plan #:
Date of latest submittal:
o On-site Sewer Plan #:
Date of latest submittal:
o Off-site Sewer Plan #:
Date of latest submittal:
o Fees: Check #:
o PDEQ Water Notice to Construct
o PDEQ Sewer Notice to Construct
o 3 copies of Plans
Date of Acceptance:
Submittal of the Plan:
Date of Acceptance:
Submittal of the Plan:
Date of Acceptance:
Submittal of the Plan:
Date of Acceptance:
Submittal of the Plan:
Receipt #:
Form B (only if work is done in the right-of-way)
o Permit #:
o IP (Grading, Paving & Drainage) Plan:
Date of Acceptance:
Date of latest submittal: Submittal of the Plan:
o Fees: Check #: Receipt #:
o 3 copies of the Plan (if different from Type II Grading Permit)
D-43
PERMIT APPLICATION FOR CONSTRUCTION OF PUBLIC IMPROVEMENTS IN THE TOWN OF MARANA
FORM A - MAJOR UTILITY INSTALLATIONS PERMIT
Date of Aoolication: I PERMIT NO. ISSUED I
Project Name:
Project Location/Address:
Description of Work (In accordance with Title 19, Town of Marana Land Development Code and Resolution 90-05):
-,
-.
-
This project is in the 0 Marana Water service area or the 0 Tucson Water service area.
Applicant/Owner
Contact Name
Address
City I State Zip I
Telephone No. Fax No.
Applicant's (If Applicant is not the Owner, the Applicant guarantees they are acting on behalf of the Owner)
Signature
-
-
Contractor
Contact Name
Address
City I State Zip I
Telephone No. Fax Number
State License No. Expiration Date
Town Business Expiration Date
-
D-44
PERMIT NO.
For Official Use Only
"" ,,' 'f'" ...PERMITYFiEE$" . , '; ......... . .,. ..... ........
Base Fee $100.00
Construction Cost Fee
Greater of $500.00 $
.-~_._.~---
OR
Construction Cost $
1% of Construction Cost - An agreement for inspection of public
improvements has been executed, and Applicant hereby agrees to retain $
an Engineer of Record and pay the costs of all tests of materials and
oerformance as required bv the Town Enaineer. '-
OR
Construction Cost * $
2 Y.% of Construction Cost - An agreement for inspection of public
improvements has been executed, and Applicant hereby agrees to retain
the Town of Marana or his/her designated representative as an Engineer $
of Record and pay the costs of all tests of materials and performance as
required by the Town Engineer.
. At the Town's Discretion
Violation Fee (Double permit fee) ~- --.-- $
TOTAL FEES DUE $
Check No. Receiot No.
Work performed under this perm.t shall comply with the Town of Marana Standards, RegulatIons, ReqUirements and Federal Permtts.
Accepted for the Town of Marana By:
Date of Issuance:
A COpy OF THIS PERMIT SHALL BE ON THE JOB AT ALL TIMES.
D-45
-
PERMIT NO.
FORM A: MAJOR UTILITY INSTALLATIONS PERMIT: SUBDIVISION AND/OR DEVELOPMENT
In consideration of mutual covenants herein contained, and for other good and
valuable consideration, the receipt of sufficiency of which is hereby acknowledged by each
party to the other, this AGREEMENT, made and entered into this _ day of
,20_, by and between the Town of Marana, a municipal corporation,
hereinafter called the Town, and:
-
-,
Name
Address
-
City, State, Zip Code
hereinafter called the Applicant
WITNESSETH:
-
WHEREAS, the Applicant desires to make improvement(s) within the Town of Marana,
Arizona at:
-
Project Name (as depicted on the plans)
Location
-
Legal Description of the Property
on private lands within the corporate limits of the Town of Marana which includes land
that will be improved upon and may be dedicated to the Town of Marana as public rights-of-
way, easements, or other areas that will become property of the Town of Marana after
acceptance and dedication. (If the project is within a subdivision, the map or plat is recorded
in the office of the Pima County Recorder in Book _ of Maps and Plats at Page -
thprAnf\' ''inri
-
....
-
-
D-46
-
PERMIT NO.
WHEREAS, the required reports, plans, specifications and soil tests for said work have
been approved by the Town Engineer or his/her designee, and the officials of the appropriate
water and wastewater, or other agencies, as applicable; and
WHEREAS, the Applicant desires that the Town approve the construction of said
improvement(s); and
WHEREAS, the Town is willing to approve said improvement(s), provided itlthey meet
Town Standards and the work is completed in accordance with Town requirements; and
WHEREAS, the Town requires that such improvements, public or private, being
constructed within the corporate limits of the Town be constructed in accordance with Town
standards, regulations, and requirements;
NOW, THEREFORE, IT IS AGREED AS FOLLOWS;
1. We the undersigned, our successors and assigns, do hereby save the Town of
Marana, its successors and assigns, their employees, officers and agents harmless
and indemnify same from any and all claims for damage to persons or property
related to the improvements/installations as set forth in the accepted plans and
specifications first mentioned above, to the fullest extent permitted by law.
2. During the construction of said improvements, the applicant shall maintain poliCies
of liability insurance, issued by companies licensed to do business in Arizona, in
amounts not less than $1,000,000.00, and the Town of Marana shall be an
additional insured. The policy limit shall not be construed to limit the scope of
indemnity above.
3. That the Applicant, with the consent of the Owner, is acting on behalf of the Owner.
4. That the Applicant shall install and construct or cause to have constructed, at the
Applicant's sole expense, the improvements set forth in the plans and
specifications,
, which plans and specifications have been
prepared by a Professional Engineer registered to practice in Arizona, and which
have been reviewed and approved by the Town Engineer, as well as by the
appropriate owner/agency. Construction shall also comply with the conditions for
improvements as specified herein.
_____1
D-47
-
PERMIT NO.
...
5. That said approval to proceed with continuous and subsequent construction
elements shall be contingent upon the continuous compliance of contiguous work
elements. Compliance of work shall be documented on the Town Construction
Inspection Checklists and Project Materials Acceptance Checklist. The
documentation will be submitted to the Town for review and approval by the Town.
If at any time the Town determines that any portion of the work has been
performed in non-compliant manner with the governing plans, specifications, laws,
ordinances, Inspection Checklists, accepted Project Materials Checklist, standard
engineering practice or conditions of this permit, then a Stop Work Order will be
issued until the conditions are rectified to the satisfaction of the Town and that
compliance has been restored.
-
-
-
6. That said work shall be done in conformance to all applicable regulations, permits,
standards, and requirements of the Town; and that all required permits shall be
obtained by the Applicant prior to the commencement of any work under this
Agreement.
-
7. That a Professional Engineer, registered to practice in Arizona, shall be retained by
the Applicant as "Engineer of Record", and said Engineer shall layout and
establish the lines and grades for the work as it progresses, shall be responsible
for the surveillance of the construction, shall develop the Project Materials
Acceptance Checklist in conformance with the Town Materials Acceptance and
Testing Guide and shall order tests to verify the compliance of materials
incorporated into the work with the specifications. The Project Materials
Acceptance Checklist shall be submitted to and accepted by the Town prior to
issuance of said permit.
-
-
8. That a Professional Engineer, registered to practice in Arizona, shall be retained by
the Applicant as "Geotechnical Engineer of Record", and said Geotechnical
Engineer shall observe, test and inspect all construction operations, including but
not limited to: clearing, grubbing, subgrade preparation, structuralltrench
excavation and backfill, aggregate base, concrete, asphalt, materials testing,
together with placement of fill. Said Geotechnical Engineer shall certify in writing
that all soils operations and materials used for this development were performed in
accordance with the recommendations as set forth in the Geotechnical
Investigation of Record and that all work, including all operations and materials,
used for this development are in conformance with the accepted plans and
specifications.
....'
-
~'
9. That a licensed and certified material testing company shall be retained by the
Geotechnical Engineer of Record. .
-
10. That the Applicant shall be solely responsible for the cost of material tests required
by the Town as well as securing all applicable materials compliance documents
and certifications.
-
-
-
D-48
-
PERMIT NO.
11. That the Applicant shall notify, in writing, the Owners of all properties abutting the
periphery of the development. Notification shall include a description of the work,
the approximate dates the construction will take place, and a telephone number
and name of the individual to contact if further information is required. Notification
shall be accomplished a minimum of seven (7) calendar days prior to the
commencement of any construction activities. A copy of such notice shall be
submitted to the Town Engineer prior to distribution of said notice.
12. That the Applicant shall apply separately for a permit to haul, access, construct in
or otherwise use any public right-of-way, easement, or other area that is currently
owned by and the property of the Town before accessing, constructing in or
otherwise using such areas.
13. That in the event that the Town finds that adequate testing has not been performed
or that a closeout package it not being completed by the Engineer(s) of Record, the
Applicant shall pay any and all inspection fees as may be charged to the Applicant
by the Town.
14. That the work shall be subject to the inspection and the approval of the Town as
the work progresses. The Engineer(s) of Record shall provide at the end of each
month a written report as to the progress of the construction together with
inspection reports, materials test reports, Certifications of Compliance, an updated
Project Materials Acceptance Checklist, completed Town Construction Inspection
Checklists representing all work elements incorporated in the construction progress
to date and any other supplemental data pertinent to the work. This Monthly
Project Progress Report (MPPR) shall be submitted to:
Monthly Project Progress Report
C/O Subdivision Engineering Division
Town of Marana
11555 West Civic Center Drive
Building A2
Marana, Arizona 85653
MPPR's shall be submitted no later than the 7th day of the subsequent month (or
the nearest following working day). Should the Town not be in receipt of an
acceptable, complete MPPR by 12:00 noon on the 15th day of the month (or the
nearest following working day), then a Stop Work Order Notice will be issued until
compliance is verified that an acceptable, complete MPPR has been received by
the Town for the previous month's work.
15. That the Engineer of Record shall show all deviations from the approved plans on
the "As-Built" mylars of the plans. All changes or deviations in the approved plans
and/or specifications, other than those of a minor nature, shall be submitted to the
Town Engineer for review and approval prior to execution in the field.
D-49
~
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PERMIT NO.
16. That the Town Engineer or his/her designated representative shall be present at
the final on-site inspection of the improvements. Prior to the final inspection by the
Town, the Applicant shall complete an on-site inspection with the Engineer(s) of
Record. Deficiencies in the work noted during the final inspection shall be
corrected to the satisfaction of the Town prior to approval of the improvement by
the Town and/or prior to release of assurances.
~
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17. That within thirty (30) calendar days of the completion of construction, the Applican'
shall furnish the Town Engineer a closeout package that includes all applicabl.
items from Section 06-06 of Title 6 of the Marana Land Development Code. A
certified listing of all items and quantities installed and associated costs will be
required to verify permit fees.
-
18. That the Applicant shall guarantee the work against defective materials or
workmanship for a period of at least one (1) year from the final acceptance of thE
imp' -nents by the Town. Upon discovery of defects, any repair or replacemem
by i~wn pursuant to said guarantee shall be undertaken immediately to the
satisl .,on of and at no cost to the Town.
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IN WITNESS WHEREOF, the Appli('.ant has executed or has caused this Agreement
to be executed by its proper and duly a..thorized officer and the Town has caused this
Agreement to be executed by the Town Engineer or authorized representative as of the day
and year first written above.
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;;" ,', dDWt,"F:R:~THOt:DSR*$AUTHOR'ZeQ;AGENT~~l:.'CAN1'Y::."".
Print or Type Com pen ~
Address
Telephone Num' 1 Fax Number
Signature of Owner, Trust Holder Date
or Authorized Aaent
Print or Type Name and Title of
Owner. Trust Holder or
Authorized Aaent
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D-50
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PERMIT NO.
The terms and conditions of this Agreement have been read and are hereby agreed to
and accepted by the following:
k, ..tc+' :ii.. ENGINEERDFRECORD: . '..
Print or Type Company Name
Address
Telephone Number I Fax Number
Signature of Owner, Trust Holder Date
or Authorized Aoent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aoent
,.. ...<..... GEOTECHNICAL ENGINEER OF RECORD: .
Print or Type Company Name
.~- ~~---- ---~---
Address
Telephone Number I Fax Number
Signature of Owner, Trust Holder Date
or Authorized Aoent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aaent
CONTRACTOR: ,
Print or Type Company Name
Address
Telephone Number
Signature ot Owner, Trust Holder
or Authorized A ent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized A ent
Fax Number
Date
Signature of Town Engineer or
Authorized Re resentative
OF MARANA~
D-51
_.~~,",. ~n_'~..""'""""""""""""_,,,,~. . .~ .~
PERMIT APPLICATION FOR CONSTRUCTION OF PUBLIC IMPROVEMENTS TO BE DEDICATED TO THE TOWN OF MARANA
FORM B PERMIT - TO BE DEDICATED TO THE TOWN
Date of Application: I PERMIT NO. ISSUED I
Project Name:
Project Location/Address:
Description of Work (In accordance with Title 19, Town of Marana Land Development Code and Resolution 90-05):
Applicant/Ow ~.
Contact Name
Add ress
City State Zip I
Telephone No. Fax No.
Applicant's (If Applicant is not the Owner, the Applicant guarantees they are acting on behalf of the Owner)
Signature
Contractor
Contact Name
Address
City I State Zip I
Telephone No. Fax Number
State License No. Expiration Date
Town Business Expiration Date
License No. ----~
. .~,--~~._--_.-
D-52
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_I
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PERMIT NO.
For Official Use Only
...::: . ...., ...c.....'.,... PERMIT FEES: ..... "
Base Fee ~'n._'_ $100.00
Construction Cost Fee
Greater of $500.00 $
OR .-- ~_..~
Construction Cost $
1% of Construction Cost - An agreement for inspection of public
improvements has been executed, and Applicant hereby agrees to retain $
an Engineer of Record and pay the costs of all tests of materials and
oerformance as reCluired bv the Town EnClineer.
OR
Construction Cost. $
4 Y.% of Construction Cost - An agreement for inspection of public
improvements has been executed, and Applicant hereby agrees to retain
the Town of Marana or his/her designated representative as an Engineer $
of Record and pay the costs of all tests of materials and performance as
required by the Town Engineer,
. At the Town's Discretion
Violation Fee (Double permit fee) $
TOTAL FEES DUE $
Check No. Receiot No.
Work performed under this permit shall comply with the Town of Marana Standards, Regulations, Requirements and Federal Permits.
Accepted for the Town of Marana By:
Date of Issuance:
A COpy OF THIS PERMIT SHALL BE ON THE JOB AT ALL TIMES.
D-53
. <._--_.,..^'~'"'~,'"......_.""-'_._"""'----"'..._...."..."'~.'-"'_..,
..,
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PERMIT NO.
...."
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TOWN OF MARANA
AGREEMENT FOR CONSTRUCTION OF PUBLIC IMPROVEMENTS
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FORM B: TO BE DEDICATED TO THE TOWN
In consideration of mutual covenants herein contained, and for other good and
valuable consideration, the receipt of sufficiency of which is hereby acknowledged ", each
party to the other, this AGREEMENT, made and entered into this _ of
, 20_, by and between the Town of Marana, a municipal co' Jtion,
hereinafter called the Town, and:
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Name
Address
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City, State, Zip Code
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hereinafter called the Applicant.
WITNESSETH:
-
WHEREAS the Applicant desires to make improvement(s) within the Town of Marana,
Arizona at:
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Project Name (as depicted on the plans)
Location
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Legal Description of the Property
on private Ie ,ds within the corporate limits of the Town of Marana which includes land
that will be improved upon and may be dedicated to the Town of Marana as public rights-of-
way, easements, or other areas that will become property of the Town of Marana after
acceptance and dedication. (If the project is within a subdivision, the map or plat is recorded
in the office of the Pima County Recorder in Book _ of Maps and Plats at Page _
thereof); and
~)
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D-54
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PERMIT NO.
WHEREAS, the required reports, plans, specifications and soil tests for said work have
been approved by the Town Engineer or his/her designee, and the officials of the appropriate
water and wastewater, or other agencies. as applicable; and
WHEREAS, the Applicant desires that the Town approve the construction of said
improvement(s); and
WHEREAS, the Town is willing to approve said improvement(s), provided iUthey meet
Town Standards and the work is completed in accordance with Town requirements; and
WHEREAS, the Town requires that such improvements, public or private, being
constructed within the corporate limits of the Town be constructed in accordance with Town
standards, regulations, and requirements;
NOW, THEREFORE, IT IS AGREED AS FOllOWS:
1. We the undersigned, our successors and assigns, do hereby save the Town of
Marana, its successors and assigns, their employees, officers and agents harmless
and indemnify same from any and all claims for damage to persons or property
related to the improvements/installations as set forth in the accepted plans and
specifications first mentioned above, to the fullest extent permitted by law.
2. During the construction of said improvements, the applicant shall maintain policies
of liability insurance, issued by companies licensed to do business in Arizona, in
amounts not less than $1,000,000.00, and the Town of Marana shall be an
additional insured. The policy limit shall not be construed to limit the scope of
indemnity above.
3. That the Applicant, with the consent of the Owner, is acting on behalf of the Owner.
4. That the Applicant shall install and construct or cause to have constructed, at the
Applicant's sole expense, the improvements set forth in the plans and
specifications,
, which plans and specifications have been
prepared by a Professional Engineer registered to practice in Arizona, and which
have been reviewed and approved by the Town Engineer, as well as by the
appropriate owner/agency. Construction shall also comply with the conditions for
improvements as specified herein.
D-55
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PERMIT NO.
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5. That said approval to proceed with continuous and subsequent construction
elements shall be contingent upon the continuous compliance of contiguous work
elements. Compliance of work shall be documented on the Town Construction
Inspection Checklists and Project Materials Acceptance Checklist. The
documentation will be submitted to the Town for review and approval by the Town.
If at any time the Town determines that any portion of the work has been
performed in non-compliant manner with the governing plans, specifications, laws,
ordinances, Inspection Checklists, accepted Project Materials Checklist, standard
engineering practice or conditions of this permit, then a Stop Work Order will be
issued until the conditions are rectified to the satisfaction of the Town and that
compliance has been restored.
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6. That said work shall be done in conformance to all applicable regulations, permits,
standards, and requirements of the Town; and that all required permits shall be
obtained by the Applicant prior to the commencement of any work under this
Agreement.
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7. That a Professional Engineer, registered to practice in Arizona, shall be retained by
the Applicant as "Engineer of Record", and said Engineer shall layout and
establish the lines and grades for the work as it progresses, shall be responsible
for the surveillance of the construction, shall develop the Project Materials
Acceptance Checklist in conformance with the Town Materials Acceptance and
Testing Guide and shall order tests to verify the compliance of materials
incorporated into the work with the specifications. The Project Materials
Acceptance Checklist shall be submitted to and accepted by the Town prior to
issuance of said permit.
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8. That a Professional Engineer, registered to practice in Arizona, shall be retained by
the Applicant as "Geotechnical Engineer of Record", and said Geotechnical
Engineer shall observe, test and inspect all construction operations, including but
not limited to: clearing, grubbing, subgrade preparation, structural/trench
excavation and backfill, aggregate base, concrete, asphalt, materials testing,
together with placement of fill. Said Geotechnical Engineer shall certify in writing
that all soils operations and materials used for this development were performed in
accordance with the recommendations as set forth in the Geotechnical
Investigation of Record and that all work, including all operations and materials,
used for this development are in conformance with the accepted plans and
specifications.
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9. That a licensed and certified material testing company shall be retained by the
Geotechnical Engineer of Record.
...
10. That the Applicant shall be solely responsible for the cost of material tests required
by the Town as well as securing all applicable materials compliance documents
and certifications.
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D-56
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PERMIT NO.
11. That the Applicant shall notify, in writing, the Owners of all properties abutting the
periphery of the development. Notification shall include a description of the work,
the approximate dates the construction will take place, and a telephone number
and name of the individual to contact if further information is required. Notification
shall be accomplished a minimum of seven (7) calendar days prior to the
commencement of any construction activities. A copy of such notice shall be
submitted to the Town Engineer prior to distribution of said notice.
12. That the Applicant shall apply separately for a permit to haul, access, construct in
or otherwise use any public right-of-way, easement, or other area that is currently
owned by and the property of the Town before accessing, constructing in or
otherwise using such areas.
13. That in the event that the Town finds that adequate testing has not been performed
or that a closeout package it not being completed by the Engineer(s} of Record, the
Applicant shall pay any and all inspection fees as may be charged to the Applicant
by the Town.
14. That the work shall be subject to the inspection and the approval of the Town as
the work progresses. The Engineer(s} of Record shall provide at the end of each
month a written report as to the progress of the construction together with
inspection reports, materials test reports, Certifications of Compliance, an updated
Project Materials Acceptance Checklist, completed Town Construction Inspection
Checklists representing all work elements incorporated in the construction progress
to date and any other supplemental data pertinent to the work. This Monthly
Project Progress Report (MPPR) shall be submitted to:
Monthly Project Progress Report
C/O Subdivision Engineering Division
Town of Marana
11555 West Civic Center Drive
Building A2
Marana, Arizona 85653
MPPR's shall be submitted no later than the 7th day of the subsequent month (or
the nearest following working day). Should the Town not be in receipt of an
acceptable, complete MPPR by 12:00 noon on the 15th day of the month (or the
nearest following working day), then a Stop Work Order Notice will be issued until
compliance is verified that an acceptable, complete MPPR has been received by
the Town for the previous month's work.
15. That the Engineer of Record shall show all deviations from the approved plans on
the "As-Built" mylars of the plans. All changes or deviations in the approved plans
and/or specifications, other than those of a minor nature, shall be submitted to the
Town Engineer for review and approval prior to execution in the field.
D-57
- '^~"'~'-~'M~"_""__',~_",,,,,,,,__,_,__,,,",,,,,,,,,.w,.",",,:~,,,, _
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PERMIT NO.
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16. That the Town Engineer or his/her designated representative shall be present at
the final on-site inspection of the improvements. Prior to the final inspection by the
Town, the Applicant shall complete an on-site inspection with the Engineer(s) of
Record. Deficiencies in the work noted during the final inspection shall be
corrected to the satisfaction of the Town prior to approval of the improvement by
the Town and/or prior to release of assurances.
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17. That within thirty (30) calendar days of the completion of construction, the Applicant
shall furnish the Town Engineer a closeout package that includes all applicable
items from Section 06-06 of Title 6 of the Marana Land Development Code. A
certified listing of all items and quantities installed and associated costs will be
required to verify permit fees.
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18. That the Applicant shall grant, bargain. sell, convey, transfer and deliver to the
Town the improvements installed pursuant to this Agreement, and shall execute
and deliver to the Town a Bill of Sale, or other approved conveyance, for said
encumbrances.
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19. That the Applicant shall execute a license agreement for maintenance by the
Applicant where landscaping is involved.
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20, That the Applicant shall guarantee the work against defective materials or
workmanship for a period of at least one (1) year from the final acceptance of the
improvements by the Town. Upon discovery of defects, any repair or replacement
by the Town pursuant to said guarantee shall be undertaken immediately to the
satisfaction of and at no cost to the Town.
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21. That the Town shall accept title to and take possession of said improvements upon
their satisfactory completion as approved by the Town Engineer,
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IN WITNESS WHEREOF, the Applicant has executed or has caused this Agreement
to be executed by its proper and duly authorized officer and the Town has caused this
Agreement to be executed by the Town Engineer or authorized representative as of the day
d fi t 'tt b
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an year Irs wn en a ove.
". ..;~.."...., ,",OWNER..l'RU$'t.)i01..DI3R iGR.,AUTHO~EI!)1~eNt~()\~.~t1CANn;c. ..........
Printer Type Company Name
Address
Telephone Number I Fax Number
Signature of Owner, Trust Holder Date
or Authorized Aoent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aoent
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D-58
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PERMIT NO.
The terms and conditions of this Agreement have been read and are hereby agreed to
and accepted by the following;
/< -'"~ ENGINEER OF. RECORD: " .....;
Print or Type Company Name
Address
I Fax Number ~ ~~
Telephone Number
Signature of Owner, Trust Holder Date
or Authorized Agent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Aoent
<" "'..,' "GEOTECHNICAL..ENGINEEROFiRECORO: .~.. ~... .. ..
Print or Type Company Name
Address
Telephone Number I Fax Number
Signature at Owner, Trust Holder Date
or Authorized Agent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized Agent
.-..",r'-"
CONTRACTOR:, '
Print or Type Company Name
Address
Telephone Number
Signature of Owner. Trust Holder
or Authorized A ent
Print or Type Name and Title of
Owner, Trust Holder or
Authorized A ent
Fax Number
Dale
TOWN OF MARANA;.
Date
D~59
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TOWN OF MARANA
FLOOD HAZARD INFORMATION SHEET
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11555 W. Civic Center Olive
Marana. t>:Z 85653
PHONE: (520) 382-2600 FAX: (520) 382-2641
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"- .......-. -
- --- ".
TO BE COMPLEIED BY REQUESTER OF INFORMATION (ALL INFORMATION MUST BE PROVIDED):
-ATTN (Requester Name):
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Phone:
Fax:.
Property Address:
Property Tax Code:
Township:
Legal Desl:ription:
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Range:
Scction:_
TO BE COMPLETED BY TOWN OF MARANA FLOODPLAIN MANAGEMENT:
Received Code Area
The following infonnation is provided for the above described property: --
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STA TLIS'
I.
The property is located in a Special flood Hazard Area (SFHA) on a National Flood lnsurance
Program (NFIP) Flood InsUfllDce Rate Map (FIRM)..
-NFli' community #: ~Q~..
-FIRM panel #: 04019C K
-Date afFIRM panel:
-LOMR/LOMA date:
-FIRM lONE:
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2.
The main structure on the property is located in the SFHA indicat~ ill (1).
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NOTE: Federal law required that a flood insurance policy be obtained as a cOlldition ora f~deral1y-backed mortgage
Or loan that is secured by a building located within a SFHA
3.
The propert})cated in a locally identified and regulated flood and/or erosion hazard area and
may be subje:2"t 10 local floodplain regulations which affect and/or Iimil existing and/nr future
uses oflbe property..... ....... ... ............
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4. The property tS located in a mapped FLOODW A Y where most uses are prohibited by local ordinance...__
.S1 A TUS KEY: Y -= Yes, N -= No, P = Partially, I "" Insufficient information for dctcmnnanon, N A - Not applicable
_.
NOTE: The above infonnation is based on the best data resources currently available. Be ad...ised that flood hazard status is
subject to change without individual nolice. This letter does not imply that the referenced property will or will O<..1t be free
from flooding or damage. A property indicated as not belng in a floodplain may be dnmaged by a flood greater than that
which is regulated or by a local drainage problem that has not been identified or is not regulated. This letter does not create
liability on the part of the provider, or any officer or employee thereof, fOf any damage that results from reliance on this
determination.
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TtwJn nfM~T~n';l t:l.n.nnnhin M:m~opmf"nt ~iUn:ltIlT~
Date
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D-60
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MARANA
~/I"
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TOWN OF MARANA
FLOODPLAIN USE PERMIT APPLICATION
11555 W. Civic Center Drive
Marana.1\Z 85653
PHONE: (520) 382.2600 FAX: (520)382-2641
TO BE FILLED OUT BY APPLICANT (PLEASE PRINT CLEARLY):
APPUCANT INFORMATION: PROPERTY INFORMATION:
NAME: ADDRESS:
COMPANY NAME: TAX CODE NO.:
MAILING ADDRESS: OWNSHIP: I RANGE: ISECTION:
TELEPHONE NO.: LEGAL DESCRIPTION:
FAX NO.:
CONTRACTOR INFORMATION (If applicable):
BUSINESS NAME: CONTRACTOR LICENSE NO.:
MAILING ADDRESS: MARANA BUSINESS LICENSE NO.:
TELEPHONE NO.: FAX NO.:
PROPERTY OWNER INFORMATION:
NAME: Information submitted with application:
~DDRESS:
TELEPHONE NO.:
Description of work taking place on the property:
Will fill or the storaQe of fill lake place on the properly? (Circle One) Yes No
By signing this permit application, the lWadersigned applies for a permit pursuant and subject to the requirements to the FLOODPLAIN
AND EROSION HAZARD MANAGEMENT CODE (TiUe 21 of the Town of Marana Land Development Code). and hereby agrees to
failhfully abide by all lI1e Covenants, Conditions. and Restrictions contained 0< referred to herein and to indemnify. defend. and hold
harmless the Town of Marana and their agents from and against any and all suits, claims, or demands associated with the approval
of this application. This application becomes a. valid permit only when completed and signed approved by the Town of Marana
below and accepted by applicant. Validated permit is subject to the condiUons and restrictions attached (IF ANY).
/APPLlCANT SIGNATURE: DATE:
THIS PORTION TO BE COMPLETED BY TOWN OF MARANA FLOODPLAIN MANAGEMENT SECTION
REC'D BY I DATE I PANEL ZONE I EFFECTIVE DATE ELEVATION CERTIFICATE
REQ'D I COMPlETE
FLOODPLAIN USE PERMIT NO. BUILDING PERMIT NO. CONDITIONS & RESTRICTIONS NO.
D-61
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...,
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FEDERAL EMERGENCY MANAGEMENT AGENCY
NATIONAl FLOOD INSURANCE PROGRAM
ELEVATION CERTIFICATE
O.M.B.No.3067~77
Expires December 31,2005
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Important Readtheinslruclions on paaes 1. 7.
SECTION A. PROPERTY O~ INFORMATION
For insurdnlle Ca'rIlir1y Use:
Policy Number
BUILDINGOWNER'S NAME
.-.
Company NAIC NI,o'" ~
-
BUILDING STREET ADDRESS (IncUling ~., Unil Suite, and/or Bldg. No.) OR P.O. ROUTE AND BOX NO.
CITY
STAlE
ZIP CODE
PROPERTY DESCRIPTION (LoI and Block IlAJmbers. Tax Parcel Number, Legal Desaiption, etc.)
-
BUILDING USE (e.g., Residential, Non-fesldenlial, Addition, Aooess<xy. eto. Use a Comments area, K neoessalY.)
LATITUDEJLONGlTUDE (OPTIONAL)
(1/If-1i#-##./IIf' or ##.##11##')
HORIZONT" .ATUM:
o N1\D 1927 0 NAD 19B3
SOURCE: 0 GPS (Twe):_
o USGS Quad Map
o 0II1er._
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SECTION B. FLOOD INSURANCE RATE MAP (FIRM) INFORMATION
I 81. NFIP COI.MJNITY NAI.'E & COI.IMJNI1Y flJtlBER I B2. COUNTY NAME
84. MOPANo PANEl 87. FilM PANEl.
NLMlER 86. FIRMWEX DATE EFFEC'TIVl:,REVJSEDDATE
I B3.STATE
B91lASE FlOC()ELEVATIa-I(S)
(2rneAO,usedeJ;lhdl\:xxlili)
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B1 O.IOOcate Ihe swrce of the Base Fbod Bevalion (BFE) data Of base IIood ~ entered in 89.
o FIS Profile 0 FIRM 0 Coommity Delemined 0 Oihef(DesaIbe):_
B11. Inci13e Ihe eIeva1ion d!tum used fOf Ihe BFE in 00 0 NGVD 1929 0 NA ',{) 1988 0 OIher (DesaIbe): _
B12. Is the buiding located in a CoaslaI8<ITier Resources System (CBRSI <rea orCilhero\ise Pmteded Area IOPA)? 0 Yes 0 No OeSlgn<ful Dale
SECTION C. BUILDING aEVATION INFORMATION (SURVEY REQUIRED)
Cl. Buidng eIev<fuls <Ie based on: 0 Ccr1llI\x:lion DraNi~' 0 Building Under ConslnJdiln' 0 Finished ConsIrtI:fun
. A new EIevatioo Celtificate v.;1 be retlJired YR1en constru:lion d Ihe bliking ~ oonpete.
C2. Buidng DaQIlIll foWber _ (SeIad the ooiding diagram roost sirrilarto Ihe bliking for which !his certiticite is being ClXT1Jieted - see pages 6 and 7. If no diagram
axura.ly feIJ'BSEIl1S theblilding, provide a sketch a-phOOlgaph.)
C3. Bevalions-Zo1esAl-A30. AE,AH,A(1Ii1h BFE), VE, V1-V30, V(1Ii1h BFE~AR.ARlA,ARJAE,ARlAI-A3), ARlAH, ARJAD
CanpIete Items C3.-a-i lJeIow aocordng to the lxildng diagam specffied in hem C2. Stale the datum used. lithe datum is dlferent frDfn the d!tum used for the BFE in
Se::tion B, cooveI1lhe dawn to tJat used forlhe BFE. Show~eId measurements and datum cnwelSion caWation. Use !he space provided a- the Omnenls area of
Se::Iioo D a- SecIioo G, a; ~ae, to documenl1he datllm CXl!l'lel'Sion.
Daium_ ConVl!f5ioolCooments_
Elevalon refelef1Ce mal< used _Does the elevalion reference mal< used appear on theFIRM? 0 Yes 0 No
o a)Topdbatcmftoa(rooong basement 01 endcsure) ~ _fllm)
o b)Topdnexll'q1erlloor _._fllm)
o cj BotlDmdkJNesthorizontalstruclurli merrber(V zones only) _._fllm)
o d)Mochedgarage(lopofslab) _ _".(m)
o e) l.cwest elevation d ma::hillelY mar equipment
selVicingll1ebuildng{DescIlbein a Comments area) _' _ft.lm)
o Q l.cwest adja;:et1t (firished) grooe (LAG) _' _ ft.(m)
o g) Highest adjacenl (finished) grade (HAG) _ _fllm)
o h) No. ct perma19ll1 openings (flood venls) v.;1I1in 1 ft. above aqaoent g-00e_
o i) Total area c1,. pema>entopenings (flood venlS) in C3.h _sq. in. (sq. an}
SECTION D. SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION
This certification is to be signed and sealed by a land surveyor, engineer, or architect authorized by law to certify elevation information.
I certify that the informafion in Sections A, 8, and C on this certificate represents my best efforts to interpret the data available.
I understand that any falSe statement may be punishable by fine or imprisonment under 18 U.S. Code, Section 1001.
CERTIFIER'S NAME UCENSE NUMBER
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0..
g~
h
UJm
H
g~
z.~
iW
:;
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TITLE
COMPANY NAME
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D-62
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IMPORTNii, In these spaces, copy the conesponcing infonnalion from Section A. F'oil1Sullrl>!~Ule:
8UIIllING'STREET ADIlRESS fi1lidr1lApt,lklt Stile, _ ~ No.) ORP.O. ROlTTE ANlBOX 00. I'dctNllllUt ... '.
.. ..........
CITY STATE ZP CODE C'.orr!my NAlCNunter
SECTION D. SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION (CONTINUED)
CClJY boIIl sides of Ihis EIevOOon Certilicale for (1) canmtXlly cAlicial, (2) insulll1Ce agerJtlaxnJmy, ood (3) bUIdIng CMner.
COMMENTS
o Check here ff attad1ments
SECTION E. BULDING ELEVATION INFORMATION (SURVEY NOT REQUIRED) FOR ZONE AO AND ZONE A (WITHOUT BFE)
For Zone AO <r1d Zone A (wiIhout BFE), COOl>iefe Items Ellhrough E4. ~ the EIevaIiln CeItiIi:ae is intended for use as SlJ~ infonnaioo for a LOMA or LOMR-F,
Section C must be COfTllIeled.
E1. BIting llagran Number _(Select the bi.ti1g cfagran mosIsirilarto thetulcfng forl'olldllhiscertifil3eis beingccmpleted-see pages 6 and 7. "no cfagmm acwately
~ the WIcIng, pnMde askeldlorp/lotog:~.)
E2. The top of the boUcmlllor(irducingbasementorIllOOsure)oflhebu1cfngis _ll(mUn.(cm) 0 arove or 0 belM(chEd<one)thehighes1 aqacentgrade. (Use
naturaI!T<Xfe, w av<j~).
EJ. For Builcfng Diagr;m; 6<l wiIh ~ (see page 7). the next higJertloo'orelev<iedfioor(oovation b) cfthe IlliIdi1g is _ ft.(m) _in.(an) Itlovethe hghest ~
gra:le. CoollIeIe items C3.h and C3J on IronI cf form.
E4. Thetopcfthe~cf~ andia'eqlipmentseNk:ingthelx.ikingis _ ft.(mUIl.(an) O;txweor 0 beIow(chEd<ooe)theh/glestaqacentlJOOe, (Use
ruiuraI gra:le, W avalalJe).
ES. For Zone AO only: "no tood depth number is avlilable, is lhetop of the bcllorn IIlor elevated ill a:oordance wiIh the CllIIYIIUIlity's 1Iocxi/ain management oni1anal?
DYes 0 No 0 U1known. Thekx:alGftcial rrustceQfyllis i:1foonalionin SectionG.
SECTION F . PROPERTY OWNER (OR OWNER'S REPRESENTATIVE) CERTIFICATION
The JXOrEIlY lMOleI' or OIWIeI's authorized repIe5eIltative who can>ktes SecOOns A. B, C (Items C3.h ood C3J only), <r1d E tJr Zone A (wiIhout a FEMA-issued or rommunily-
issued BFE) or Zone AO must si!P1 here. The stEtements in Sections A, a. c. and E BIe cormd to the best of my knowiedge.
PROPERTY O'MIER'S OR OWNER'S AUTHORIZED REFRESENT A TIVE'S NAME
ADDRESS
CITY
STATE
ZIP COO!:
SIGNATURE
bATE
TELEPHONE
COWENTS
SECTION G. COMMUNITY INFORMATION (OPTIONAL)
The kx:aI dlicial who is auIhorized by law or ordnance to a:lninisterthe oommlllilYS ~n mmagement ooinance can <XlffiI:lete SecOOns A, B, C (or E), om G of !his 8evalion
Cer1fulte. CCJf!JeIethe ~ i1Em(s) and sigl below
Gl. 0 The informalion "Section C was taken from otherdc:x:unentlii:J!hat has been sq,ed <r1d entossed by a licensed SUNeyor, ""fineer, or ardllect who is auIhcrized by_
or kx:aIl~ 10 ceI1ify e/ev<fuJ information. (Incfcale the SOOIte and dale cf the elevation data in the COIrmenIs a-ea below.)
G2. 0 A oorrrnunily oIIiciaI ~eted Sediln E for a bUIcfng Ioc<ied in Zone A ty.;1hout a FEMoI.-issued or oarnmunjty~ssued BFE) or Zone AD.
GJ. 0 The falcNJing iIYormalion (.ems G4-(9) is IIOYided for COO1IIlJnily fIocxjpan management PUIpOSes
I G4PERMrr~ I GS. DATEPERMrrIS5UED I Gli DATECERTFICATECF~ANCY~
G7. Thi> ~t has been issued for. 0 New Constndion 0 Substalliallmprov..-nent
GB. 8evalon cf as-bliIt IaNesI floor Ondt.ding basement) cf 1he bJilcfng is:
G9. BFE or (in Zone AD) depIh cf tIloding at the ooklng site is:
LOCAL OFFICIAL'S NAME
o Check here ff attachments
_._ft.(m)
_,_ft..(m)
Datum:
Datum:
TITLE
COMMUNITY NAME
SIGNATURE
COMMENTS
TELEPHOOE
DATE
D-63
UM 1~......lrH "" ~r RlItH'dh.: ....:1V $lMo$j~. fI'ondlld o.,thol2.5 '-4
{Ura.I6Aa.}
65
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CHART 9
DEVELOPItEKT REQUIREMENTS FQR DRAntAGE IN WORTttERN MARAN.
TOWill OF _""ANA! OEVELCPMENT SERVICES tEMTER
oeCbl8EII.1DClD
-
-
-
-
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-
-
-
..
-
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-
-
-
-
-
OB ADDRESS VALUATION
USE OF PERMIT ASSESSOR'S PARCEL NO.
SUB-DMSJON rHO
OWNER OF PROPERTY: OFFICE USE ONLY
OWNER'S ADDRESS: 0 PLANNING
I---
CITY/ZIP: PHONE NO.: a HOAlARC APPR.OV AL
APPUCANT I TENANT: /.- CJ
E)'iGINEERING
IADDRESS: : I---
CJ k>RADING PERMTI TYPE 1
CITY /ZIP: " i--
CJ ERMJT#
PHONE NO.: FAX NO.: I---
a GRADING PERMIT TYPE 2
CONTRACTOR: -
CJ PERMJT#
-
ADDRESS: . CJ FLOODPLAIN
ClTY/ZIP: -
,0 JUGHT OF WAY
-
PHONE NO.: FAX NO.: a FORM A, MAlOR UTIUTY
-
CONTRACTOR'S lJCI!NSIl NO. TOWN of MARANA B1JS lJCENSE CJ ~RM WATER POLLtiTJON
ARCHITBCTIBNGINEBR I---
a foRM D, PUBUC IMPR
iADDRESS: ...... a Btm..DING
CITYIZIP: '--
CJ LOcAL FIRE MARSHAL
PHONE NO,: FAX NO.: I...--..
0 STATE FIRE MARSHALL
ARcHrrBcTSlENGINEER'S REGISTRAR NO. -
0 SPECIAL INSPIlCTION
Application is hereby made to the Building Official for permit subject to the conditions and -
CJ HEALTH DEPT POOLS, FOOD
resDictions set forth on hislher application. !AsBESTOS NESHAP -
I--
I hereby certify that [ have read and examined this permit application and know the same to 0 PfFlCE OF MANUF. HOUSING
be true and correct. All provisions of laws and ordinances govemi~ this type of work will L....--
whether specified herein or not The granting of a permit does not presume to give authority 0 SEWER CARD OR SEPTIC
to violate or caJlcel the provisions of any other Federal, Slate, County, or Town laws
!regulating
!construction or the perfonnance of construction. CARD NO.:
-. - ----
TOWN OF MARANA
BUll-DING SERVICES DEPARTMENT
11555 W CMC CENTER DR
MARANA, ARIZONA 85653
BIDLDING PERMIT
APPLICATION
PERMIT #
D- 64
Appendix E
Service Request Form
Facilities Maintenance Work Order Request Form
E
..,..~
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M,t\RANA
"..,....,""..:~ ..... I """.
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TOWN Of MARA,l'iA.
Operations & Maintenance Department
WORK ORDER REQUEST
Fax Request To: 382-2514
OR
E-Mail ToMMencinaer@Marana.Com
TO: Mike Mencinger or George Pesina Sr.
DATE:
DEPARTMENT:
FROM:
LOCATION:
PHONE #
SERVICE
REQUESTED:
DEPARTMENTAL
SIGNATURE:
DEPARTMENTAL BUDGET LINE ITEM:
COMPLETION DUE DATE:
TIME:
CONFIRMATION DATE:
E-l
-
-
-
-
~~
MARANA
~/ 1 '"
!OWN Of_'"
-
-
Marana Operations & Maintenance
.-
FAX REQUEST TO: 382-2514
or
E-MAIL TOPSMOTHERSCBlMARANA.COM
-
--.
TO: Peggy
DATE:
FROM:
DEPARTMENT:
LOCATION:
SERVICE REQUESTED:
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E-2
-
Appendix F
Pima County Stormwater Detention/Retention Manual
F
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Stormwater Detention/Retention Manual
.. .... .
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~",~,~,",___."_.........:,_.,,,.,_, __ .... ...... N.
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, ":. " .. ,': :~- ': >-X~~R~:?:::> '. ~,;:::;;:;f~;~~~~
.,.;t~.~.. ,- ~~'e>'..'.'.,., ~ r'-" _~ ~:.:~::..~., ~-' .': ~-c--. ,};~ ...~~~:-:'/~~-~ ,~<..::^:~: ~i~a .pqUQ!Y~%
if!lllXi,t~:!1~i~:~-;!~:';!~:.~;;.:r~1i~;~.~~~f~J~~ii~~,~
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Acknowledgments
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Ttis r . anual was prep&: .A1 for the Pima County Department of Transportation
and flOOd Control District (pcoor & FCD), by Simons. U & Associates. Ine.
(SLA) in association with Rogers, Gladwin and Harmony, Inc. (RGH). The c0n-
tract was under the direction of Mt Curtis Lueck, P.E., Manager, Planning Divi-
sion of the Pima County Department of Transportation and Flood Control
District, Mr. David A. Smutzer,.Manager, Long Range Planning Section a....
Pima Counly DepartmentofTransportation and Fkxxt Control District, and Ms.
Marie S. Peantne, also of the Long Range Planning Sec:tianofthe Pima C0un-
ty Department of Transportation and Flood Control District. The Project Prin-
cipal at SLA was Mr. Michael E. Zeller, P.E., and the PrOjed Manager was Mt
RobertJ. Smolinsky, P.E. The Project Principal ofRGH was Mr. Watt Rogers,
and the Project Manager was Mr. JeffleyJohnson.
The Pima County Department of Transportation and FIooct Control District,
Simons, U & Associates, Inc., and Rogers, Gladwin and Harmony, tnc. wish
to extend their grateful appntCiation to the DetentionlRetention Subcommit-
tee of the DesIgn StandardS Committee for the 18chnicall8VieW which they
provided through all stages of this project. The subcommittee, chaired by Mr.
Benny J. Young, P.E., City Engineer. City of Tucson, consiseed of represen-
tatives from the Southem Arizona Home BuiJders Association, the Pima
Federation of Hofn8O\>'''181'S. the United States Department of Agricultunt,
Agricultural Research ~ce. Southwest Rangetand Watershed Research
Center.1he City of Tucson Engineering Division, DepartmenlofTransportation,
Pima County Parks and Recreation, Tucson Water. the American InstituL of
Architects, and the Arizona Society of Professional Engineers. Through the
invaluable contributions provided bc' this subc;:m1mJttee, a truly useful, prac-
tical manual was developed.
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Table of Contents
c,_
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ii
I.
Introduction
1.1
1.2
1.3
1.4
1.5
1.6
Detention/Retention Requirements
2.1 Balanced and Critical 8asin8............................13
2.2
2.3
2.4
2.5
Design Procedures and Criteria
3.1
II.
irl1f1tlStaC)J~ ~tIt..rmuC)".........................................1~
~~ ~ir1 ~l1itled...............................141
Retention Feasibility Map .................................20
~JJtI1 11) C3iFC)"I1~r ~..............................~
III.
HydrolDg'y'................. ........ .... ....... .... ........ .......~
3.1.1t
3.1.2
3.1.3
~pitation .. .......... ..... ... ...... ......... ..... ..25
~Il~ and ~LI~...............................;2!5
InfIaII Hydrographs ..........~....................26
3.2 Retention ....... ..~'.................................... ... ..... ..32
3.2.1 Required Storage Volume ......................32
3.2.2 Method of Disposal ...............................32
33 Detention ............... ........... ............. ...... ...........33
3.3.1
3.3.2
Estimating Detention Storage Volume .....33
Outflow Hydrograph Determination
(Reservoir Routing) ....... .............. ...........~
Prir:'cipaJ Outlet Structures .....................45
Embankments... ....................................48
3.3.3
3.3.4
3.4 Sedimentation ImpactS ....................................50
3.4.1 Estimating Sediment Delivery.................SO
3.4.2 Methods for Control of Sedimentation .....51
3.5 Criteria for Special Detention!
Retention Methods ........ ............ ......................53
3.5.1
3.5.2
Sut1ace Storage ....................................53
Pa.rking Lot Stora.ge...............................55
r
.' ~
p~p~
3.6 Basin Design Requirements.............................58
3.6.1 Basin Sicfe..Slopes and Depths ...............58
3.6.2 Security Barriers, ...................................59-
a6.3 Multiple -Basins .....................................60
1\1. Multiple-Use Concepts and
Aesthetic Design Guidelines
4..1 Basin $iting ....................................................61
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-
3.5.3
3.5.4
3.5.5
,....
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-
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4.1.1
4.1.2
4.1.3
4.1.4
,....
Rooftop Stc)ra.ge .....................................55
Underground Storage ............................55
Subsurface Disposal .............................55
Project Scale Sites' ................................61
Individual 'Pa.rcels ............................. ......62
R8g'ionaJ ~lities .................................64-
Roadside Bast,. ...................................64-
4.2 Multiple Use Concepts.....................................65
,....
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
-
Project Amenity' .....................................65
.Active Recreation - ............ ........... .... ..... ..-65
Passive Recreatioo................................fI1
Urban Open Space ....~..........................69
Preservation of Native
Plant Communities ................................~
4.2.6 Water Harvesting for
Recharge and Re-use............................71
4.2.7 Wildlife H.abitat ...................................... n
4.3 Technical Requirements and Guidelines............74
4.3.1 Basin Configuration ...............................74
4.3.2 Basin Landscaping................................85
4.3.3 erosion Control ......................................96
4.3.4 Landscape Irrigation ..............................W
\I. Report Submittal and Review Requirements
5.1' Submittal Procedure ........................................99
5.2 Storrnwater DetentionIRetention
-
Report Requirements. ................ ................ ....... ..99
VI. Bibliogra.phy ....... ........... ................. ...... .... ...... .......103
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List of Figures
Engineered Basin Ftoor .................................56
Figure 3.9: Typical Dry-Welllnstallation.............................57
Figure 1.1:
Figure 1.2:
Figure 1.3:
Figure 1A:
Figure 1.5:
Figure 2.1:
Figure 2.2:
Figure 2.3:
Figure 3.1:
Figure 3.2:
Figure 3.3:
Figure 3.4:
Figure 35:
Figure 3.6:
Figure 3.7:
Figure 3.8:
Open Space and Common Areas.....................3
PedestrianPtazas and Courtyards ....................3
Roadway Embankment Storage .......................4
Parking Lot Detention ......................................4
Regional Detention BasinS ...............................5
Definition SketCh for Example 2.1.....................19
Retention feasibility Map for
~ Ph1lEl Cou~ .....................................:!1
Depth to Groundwater, Tucson SUin
and Avra valley ..............................................23
Example WllterShed for. Method B...................3O
HydrographDeterminmion by Method B ..........31
Graphical Representation of InftowlOutftow
Hydrographs for Type I, II, III, & IV Basins .......36
Working Curve ..............................................43
InfIow/OutflOW Hydrograph for. 0100 ................46
Typical Multi-Frequency OUtlet Structures ........47
Sediment:rtap Concept .~................................52
Conceptual Cross-Section for
List of Tables
Table 3.1: . RElinfall Depths of Various
Table 3.2:
Table 3.3:
Table 3.4:
Table 3.5:
Table 3.6:
Table 3.7:
Table 3.8: _
Return-Period Events .....................................25
Hydrograph Rise Times for Tc .~. 60 Minutes...2B
Ratios for Generation of Pima County
Synthetic Flood Hydrograph ...........................29
Runoff Coefficients ........................................33
Synthetic Inflow Hydrograph for Emmple 3.1...39
Stage-Storage Relationship for Example 3.1 ....40
Stage-Discharge Relmionship for Example 3.1 .41
Stonlge-Discharge Relationship
for Example 3.1..............................................41
Table 3.9: Working TElbIe for Example 3.1........................42
Table 3.10: Routing Table for Example 3.1 ........................44
iv
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Introduction
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I. Introduction.
1.1 Goals and Objectives
The purpaee of this manual is lID tIStabIiIh uniform policies. cri1eria. and
me1hodofogies for the ptlMing and design of stormWBter detentianInItBn
facilities within Pima County and the City of Tucson. It is intended that deten-
tionIr8I8ntion f8cUIties designed in accordaIa with the guidelines pnlS8nred
hentIn will meet" taIIawing pis: 1) IndependenIIyIlllilfy Pirra County arDOr
City of Tucson floodplain management ordinance pteMIions with regard to
8tDrrnWBt8r d8t8ntian1r8ten: 2) I8IWt in detenIionIr8I8ntian facilities which
are rnuItiowe and visually eppeeling: and 3) ensure tI18l the irnpIet'IW dation of
ID1nWat8rretention f8CiIitieS wiD not jIop8rdize the quality of groundwater
I8IOUrCIS.
-
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,~)....
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A 8UIIVI18IY of poIcies end crIIeria II pnwIded within Section1A.1t is 1m-
partIInt thatthta I8CtiDn be thoIaughly IUd end completely underatood
prtortollpplyingthedMignpmcedu_contaIned within the bodyoflhis
manual. One of the major objectives of this manual is to provide guidelines
towards ensuring that future det8ntionlretention facilities will be planned ancI
designed in such a way that they will be conside18d as amer.iti8s by the 8ffecI8d
community. In the attempt to achieve this goal. Chapler 4 provides delailed
policies and criteria regarding the grading and landscaping of proposed ~
tionInttention b8sins for multiple .....
The technical engineering details asooiated with the anaIy&is ancI design of
detenlionlr8t8ntion f8ciIities 1ft adcIJ8SI8d Within CtuIpters 2 and 3. Much of
the material contained within these chapteJsis targeted for use by practicing
engineers in the water-ntlO\l'C8S field. or other individuals with equivalent
knowledge or training. Consequently, an understanding of the basic COIapIS
of hydtaIogy and hydraulics .. been assumed. No attempt .. been made
to discuss the theory or derivations of the methods presented herein; rather. a
simpfified ~8PProach is presented. Should 8dditionaI inbm8tion be
desired, the user is encouraged to consult 1he selected ,.-...ncelist provided
at the end of this manual. Additionally, a technic31 memorandum which des-
cribes the methodologies used in developing many of the equations and ~
c:edures presented in this manual is on file at the offices of the Pima County
Flood Control District and the CIty of Tucson Engineering Division.
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1.2 Applicability
....
<IlI\IIiIll<
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........
The methods and policies presented within this manual are applicable to the
planning and design of stormwater detention and retention facilities within Pima
County and the CIty of Tucson, Arizona. Due to both the hydrologic complex-
ities associated with large watersheds and the desire to maintain simplicity within
this manual, the methods of hydrologic and hydraulic analysis presented within
Chapter 2 and Chapter 3 should be _ied tD watersheds having drainage 8f88S
no greater than one aquare mi. unless specific authorization to the contrary
is grantec:l by the appropriate reviewing agency (i.e., either Pima CoUnty or the
City of Tucson). Detention basins which receive runoff from upstream water-
sheds that are greater than one square mile in area shall be considered as
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1
:.l
~4?7
regional facilities, and generally will be planned and designecl in conjunction
with basin-management studies or specific flood controIprajects performed
under the direction of Pima County or the City of Tucson. The channeI-routing
ptOCedures presented in this manuaJ (such as in Chapter 2) 818 appQcable 0n-
ly to watersheds of ten 8qU818 miles or less. For watersheds greater than ten
&quare miles. men eophlstic8ted mathematicaJ modeling of Wat8nIheds is
reqUired.
Chapter 4, which addresses Uface tr&atll~ grading, 8nd muttk8e c0n-
cepts, is also inteIlded lobe applicable onIymthe planning &net design afc:lelen.
tionIretentioo facilities which inlercepUlowfrom drainage -no;rRIItTthan
one square mile. For the planning and design of nIgioNd facilities, the ntader
is ....ed 10 the dOCUment entiaed .'Guidell1es farthe Develapmemd Regional
Multiple-Use DetentialllRetention Basins in Pine County, Arimna," available
from the Pima County Department of'hnsportation and Flood CanIroI DistrtcL
Use of this manual does not supercede 1heneed far acquiring Y8Iious permits
requirwd for the construction and operation of deIentionIreI8n facilities. The
f8aderis 8dvisedthet such pemlllS are f8qUiredbythe Slate and by IDc8J gcMrno
mental agencies.
1.3 Detentio~~ention Concepts
One of the unavoidable consequences associated with the urbanization of
watersheds is an increase in the frequency, magnitude, and wlume of runoff
from previously undeveloped drainage areas. Problems associated with
development include increased flooding, erosion 10 public and Private im-
protI8menIS, and diminishing adequacy of storm drains and culv8rts to convey
the increased runoff. In ftICOgnition of these problems, Pima County and the
City of Tucson have irnplementecf stormwater detentionl retention requirements,
as one aspect of. Urban storrnwaI8r . management, through the Inclusion of
speciftcdetentionlretention requirements within their respective ftoodplain
management ordinances.
The concept of stormwater detention involves the temporary storage of runoff
for subsequent release. at controlled rates, inID downstream CDrMJyance
systems. Retention, however. consists of the on-site storage of runoff which is
notsubsequentiy discharged into a downstream watercourse: but rather may
be consumed by evapo.transporaion, domestic re-use, or drained Into the sub-
suriace through infiltration. Some detentionlr8tention facilities are merely singte-
purpose (i.e., for fl~l uses only). However, it is much more favorable,
from both a social and economic standpoint, to provide multiple-uae facilities.
listed below, and illustrated on FIQUres 1.1 to 1.5. are some 8lCBmplesof multiple-
use detentionlretention concepts which have been successfully implemented
throughout the country.
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Open Space and Common Areas
Landscaped areas and common areas. typically provided in conjunction with
high-density residential areas, provide an excellent opportunity for deten-
tion/retention of runoff. Such fUnctional open space may be employed to meet
rezoning requirements.
..-
Figure 1.1
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Pedestrian Plazas and Courtyards
Similar to common areas in residential areas, pedestrian plazas, courtyards
and landscaped areas can be used for stormwaterstoragewithincommer-
dal/industrial areas.
.....:...-.
Figure 1.2
3
~.i ~.)
f)~
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Roadway Embaokment Storage
When feasible, use of a roadwayfjfl slope as an embankment provides an
economical means of stormwater storage. This concept has been termed
"blue-green" storage in some areas.
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Figure 1.3
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Parking lot Detention
Commercial and industrral developments which have large parking lots can
typically utilize these areas very economically forstormwaler storage.
-
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Figure 1.4
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4
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{)() /~:~)
Regional P~tentlon Basins
Large-scale detention basins provide an excellent opportunity to develop
regional park facilities and permanent ponds for recreation and open-space
uses.
Figure 1,5
1 A Policies
This section provides Rsummary of the general policies relating to stormwater
detention/retention that are in effectfor both Pima County and the City ofTuc-
son. The reader is referred to the current Pima County and City of Tucson
FlOOdplain ManagementOrdinances for specific requirements and tothe 8P-
propriatestafffor relevant departmental policies; including site-specific policies
not covered in this general document. Many of the policies listed within this
section have also been included in appropriate sections withinthe body otthis
manual.
A Balanced Orainag~ Basin is one which has been identified as hav-
ing the potential fora severe increase in flood hazards as a result of in-
creased urbanization within the basin. Stormwater detention/retention
facilities shall be incorporated within all new developmentstotheextent
necessary to ensure that, at a minimum, the post development 2-, 1o.~
and 100-year peak discharges from the site will not exceed the
predevelopment values.
A Critical Drainage Basin is one which has been identified as already
having severe flooding problems as a result of eXisting watershed con.
ditioM. Stormwater detention/retentionfacilities shall be incorporated
wlthlnallnew developments to theextentnece$sary to ensure a reduc-
tiem in theexJsting2-, 10-, and tOO-year peak discharges from the site.
The amountof reduction required shallbedeterrnlnedby the regulatory
agency which has jurisdiction (i.e., eitherPima County ortheOity of Tuc-
son). and shall typically be based upon the flow capacity ofacritical chan-
nel reach or critical drainage structure located downstream of the storm-
Waterdetention/retention. facilities.
5
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~
Stonnwater detention criteria may be waived for certain developments
that meetth. hydrologic crtteria prwsented within Section 2.3 of this
manual. with apprcwat of the regulatory agency.
Stormwater detention requirements may not be waived lithe proposed
development is located within a critical basin and anyportion ofacrttic81
channel reach or a critical drainage structure is located downstream of
the development or If other conditions exist which the County or City
Engineer deem justifiable for f8quirlng detention.
Threshold retention systems which ret8Jn. at a minimum. the wlumetric
difference between the developed and existing 2.,... runoff or" dIf..
.renee In peak discharges, whichever is gt'8II8~ IhaII be IncorponDd
within all new developments which meet the foIkMingarlterian:
Arrf residential development Iargerthan one acre In size which his
a densltythr8e 10 six units per developed acre. andthlltantloGated
within a watershed which has not been classified as a crtticaI or
balancecl basin.
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Threshold retention systems which retain, at a minimum, the volumetric
difference between the developed and existing 5-ye8r runoff or the dif.
terence in peak discharge, whichever is greater, shall be incorporated
within all new deYelopments which meet the following criteria:
All commercial or Industrial developments largerthan one acre in
size.
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-'
Any residential ckMIIopment largerthan Dn8acre in size which has
a density greater than six units per dewtloped acre.
Arrf residential dtMlopment larg.rthan one acre in size which has
a density greater than three units perdeY8loped acre. and that are
located within a watershed which ha been classified as a critical
or balanced basin. This criterion may also be applied, at the discre-
tion of the appropriate nwiewlng agency (i.... either Pima County
or the City of Tucson)~ to drainage basins which have not been
previously identified 8S being "critical" but are not currently co"'"
sidared suitable for additional urban development without more
thorough study.
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tn locations where sto~er retention is not feasible due 10 physical
constraints (e.g., close praximityof bedJOCkorgroundwater), the foIlaNing
additional detention requirements may be imposed in lieu of threshold
retention:
.... -
-
The detention requirement wftl be, at a minimum, the difference in
volume between the developed and the existing 2.year runoff
volumes or the difference in peak discharges. whichever is more
restrictive, with the difference in volume andIorpeaks between the
developed and the existing ~ar runoff volumes being the max-
imum to be detained. The maximum peak discharge to be released
from a detention basin is one (1) cfs In a drainage basin designated
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---
as ubatanced"<< ucritical" and three (3) cts in a non-designated .
drainage basin. with 8)CC8ptions to be determined by the Pima
County or City of Tucson Engineer. The 2.yearl5-)Urcrtteria shall
be applied .in the same manner as it is applied for establishing
threshold JWtention requirements.
Detentionlretention systems which utilize a method of subsurface
di~I(e.g.. dlywells. engineer8dbasinfloOrS. trencheS. etc.) shall be
located IUCh that the infiltration surtace will be. minlmJ,lm cIistanC8. both
hoIlzontaUy and wrtlcally, tram any functioning water wen. The Pima
County Flood Control DistriCt or the CIty 01 Tucson engineering Divison
should be.contaeted regarding the applicable criteria to.be used for the
specific type of development proposed.
Infiltration rates of dry wells, infiltration trenChes. or baSin floors shall not
be used as outflow rateS in ftoockouting procedures.
On-line detention f8cilitieS shall not be allowed on channels which drain
a catchment area greater than 100 standard acres in size upstream of
the detenticJn.basin outlet struct&n(s). unless approval to do 80 is first
granted by the appropriate reviewing agency (i.e.. either Pima County
or the City of Tucson).
The use of rOOflOpl as storage areas tar.runalf is not an acceptable
method of meeting the detention/ret8ntion criteria of either Pima County
or the City of Tucson.
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Individual lot-storage systems within single-family residential
deYeIopmen1S are not acceptable tor meeting the detentiOnI retention
criteria of either Pima County or the City of Tucson.
Maintenance of local detentionlret8ntion facilities, provided in conjunc-
tion with new developments, shall generally be the responsibility of the
private property owner or neighborhood association. Records of annual
maintenance procedures shall also be kept on file by the private property
owner or neighborhood association for periodic review by the appropriate
agency (i.e.. Pima County or the City of TucsOn). The appropriate review-
ing agency ahall also reserve the authority to periodically inspect
privately-owned detention/retention facilities to ensure satisfactory
maintenance is being provided. There may be instances where public
ownership and maintenance may be appropriate, and shall be handled
on a case-by-case basis.
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Access shall be provided to all detentionlretention facilities, as needed.
for maintenance purposes. The appropriate reviewing agency (i.e.. either
Pima County or the City of Tucson) should be contacted regarding
specific access requirements.
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.0-:..
Channel design, in conjunction with detentionhetent facilities, should
be undertakBn only afterfinlt giving consideration to the tollowing rec0m-
mended hierarchy: 1) natural channels, 2) channels with grade-control
structures. 3) fully.lined channels. In other words. a natural channel
deSign should be considered first. unless stability problems 8bsoIutely
dictate the need for grade controls or full channel lining.
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DetentionIRetention bf;'s should bedesignecl formuttiple uses where
feasible.
Grading requnmenls ttJr clet8ntianlr8t8fac1l1ties are proyidedwithin
this chapter and within Chapter 4. All applicable grading ordinances and
poticies of the appropriate reviewing agency should also be met.
Landscaping of detentionlr8t8ntton facfltties IhouId Incorporate the
design criteria esta~iahec:l within Chapter 4 of this manual.
The Pima County or City of Tucson Partes and Recreation Department
shouIcI be contacted regarding proposed IIorrnW8tetdet8ntior\lJwtention
in designated public areas within ntaldentill, commerciaJ.1nd industrial
developments.
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A-
....
The policies, criteria, and AlqUlrements stated within this manual are in-
tended as minimum standards. More specific or restrictive ,.qUirernents
may be developed,forlndividual watersheds In conjunction with the
undertaking of specific _ basin-management studies, rezoning re-
quirements, area-plan policies. or eommuntty.plan policies. The specific
requirements developed as a part of any basin-management plan that
may be adopted by either Pima County or the City of 1lIcson shall
supercede the more general requirements pres.rated within this manual.
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1.5 Giossary of Te~S
The following glossary cantainI termS which may be found throughout this
manual. In CII1Iin inItIIlCIS. thedlfin.lioI. provided repl8llntaapecific c0n-
notation of the term .. It II ul8d within the manual.
....... BaIn-A wawshedors&4l-wstershedwhich hBsbeen icIen-
tffieCIas haYing the poIentIaI for a.... incr88l8ln flood huards as
a nlSUlt of incr8ued urbIInizaIIOn wtthin.the bUin.
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....n Floor - A rock.fllled volume within the bottOm of a stormwater
8lDI'8g8 f8ciDty, Ind deSigned far the pII"POI8 aftlll'npOrarly storing runoff
and subsequently disposing of same by the procell of InfiItnItion into
the subSUrface.
eor-....ldlon PoInt - A hydrokl9i' term which dI8crIbIs my specific
pointwtthln a watershed wher8 the surface clr8inage is to be analyzed.
CrftIClIBuIn - A WI18rahed or IIlb-w8t8rsMd which has been iden-
tified U havlngllMll8 flooding pIObIems as a result of existing water-
shed conditions.
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-....
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Culvert - A short. closed conduit, typically designed tar conveying flow
thrOUgh en emblnlcmenL
Dralnage.....- A geograpticaI... which conIributeSutace runoff
to a particular point of interest. The term "drainage basin" and "water.
shed" are u.d irIterehangeabl within this manUIIII
Dry well- An .nglneereel hole with grated inlet designed to accept
ItDImW8t8r runoff, thereby allowing it to drain into the aubsurface strata
which lie immediately abcMt the groundwatertabl..
EmbMkment-AR artificial mound of earth which can act to impound
water.
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Emergenq' SpIllway - An outflow spilhvaytrom a stormWater storage
facUlty which.is provided to allow for the safe overflow of floodwaters
should situations arise that weN not taken into account under nonnal
design usumptions.
Flow Hydrograph - The functional relatIonShip belVIeen time and flow
discharge, as obHlWd at a particular point within a watershed.
Hydragraphs 81'8 typicaUy representecl either graphically or In tabular
torm. .
Flood Peek - The largest value of the tIow discharge which 0CCl.n dur-
ing a flood event, asobselWd at a particular point within the watershed.
Flood Routing - The mathematical simulation of a flood wave as it
rncMIS downStI'8ani through a watercourse or detention basin.
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InfIttndJon - The movement of water through the surface of the soil.
In this manual. the terms "percolation" and "intittndiontt will be wed in-
terchangeably; however. 8trictfy speaking, the term "permlationtt is
defii1Id..the movement of_through eailstralaC..... water infIItrat8s
through the soU surface. and then percot8teI.through the undertying
.....).
Inftllrdon lntnch - A rack.fWed tnmch. poelibfy containing. per..
foraI8d pipe. de8ignec:f for.. purpoII8 oftllmpOlWtly storirig runoff. 8IId
then subsequently disposing of It into the subsurface by infiItr8tion.
Inflow - Runoff which flows inID. IdDrmwater I1r:nge facility from the
upsbeam watenlhed.
Multl-Purpoae Satn - A detentionIr8t8ntion basin which provides
benefitlln Iddition 10 the primary function of load ~moI. Such beMftbt
may incfude recreation. water harvesting. vi8uII buffers. or parking.
0ff.Une DetenllonlRetentlon ....n - A atmmwater stDrage facility
which is located nearoradjacentlo. W8tercOUrI8. (i.... the channel does
not tIow dintctfyinID the basin).'1nfIcMt 10 the basin is typicafly accampIish-
ed by means of side weirs.
t
On-LIne DetentlonIRetentfon ea. - A IdDnnwater atDrage facility
which is located within the path of a watercourse. and therebytypicafly
intercepts the entire flow from the upstream watershed.
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0ff..S1te Drnw-oe - StDrmwater runoff emanating from remote...as
which affect the site under irMtstigation.
0n-S1te D..In8ge- Starmwater runoff which emanates directfyfrom
the site under investigation.
Orifice - A smaI,1 hole designed for draining a stormwater storage
facility.
Outflow - Runoff Which exits a S1armwater storage facility by means
of an outfet structure. '
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... ..'-.
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Outlet - The point at which stonnwater runoff flows out of a deten-
tion/retention facifity. Outlets may consist of culverts, weirs. orifices. dry
wells. etc.. Of any combi~ thereof.
Retum Perlocl- The average interval of time within which a particular
magnitude of flood should be equalled or exceeded at least once (e.g.
. ftood magnitude having. return period of 100 years will be equalled
or exceeded. on the average. once every 100 years).
RIse Time - The time interval from the beginning of runoff to the time
of peak discharge. as represented by the flood hydrDgraph.
Scour- The removal of materia, from the bed and banks of a channel
as a result of flowing watet
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Sediment 'nap - An area within a stDrmWBter storage facility which is
deSigned to trap the majority of incoming 88Climents for the purpose of
facHitating maintenance.
Stage - The height of water within a 81D1'mW8t8r IlDI'8g8 faciUty, as
measured above an established datum.
StormwaterDetenUon SUln - A facility which tsinporarily stOres sur-
face runoff. and then releases It at a controlled rate through a positive
outlet.
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--
StormWIIter Retention Buln - A tacility which stDr8S surface runoff,
but is not provided with a positive outlet. No flow is discharged directly
inlD a dowrISbUm waterCOUrse from a r.wdiOn belin, bUt may bednli~
ed into the subsurf8ce by infiltration.
SUbsurface DIapoUI- Drainage of stDrmW8ter runoff into the subsur-
face by the processes of infittratiorrand percolation. This may be ac..
complished through use of dry wells, engineered baSin floors. inftttra.
tion trenches. etc.
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1lINShold Retention - A provision which requires retention of the
volumetric difference. orthe difference in peak discharge, whictHMtr is
greater, between the pre- and post-development onslte runoff volumes
for the 2-year to 5-year flow events.
Time of Concentration - The time required tor surface runoff to tr'aY81
from the hydraullcaly most remote part of the drainage basin lathe point
of concentration. .
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-...
TnIsh Rack - A meta' bar or grate structure located at the inlet of an
orifice or CUMtrt, and designed so as to prevent btockage of the inlet by
water-bome debris..
Weir (Broed Cntsted) - An open.channel control ..ction, with a
horiZontal crest above which fluid preSsure may be considered
hydrostatic. ltis normally placed across a stream or a ditch either for the
purpose of diverting or for the purpose of measuring the flow of water.
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1.6 Wst of Symbols
A
Cp
Cw
Owdev
Ow.
nb
o
Pc
Pn
Pt
P1
q
Qi
Qo
Qp
S
T
t
TAB
tc
1f
1f'
Tr"
l::.t
v
V
Vd
Vr
Vs
VSD
12
Watershed area.
Fractional portion at a drainage basin which con1ributes
sediment.
Weighted runoff coefficient.
Weighted runoff coefficient for developed site conditions.
Weighted runoff coefficient for existing site canditIons.
Watershed basin factor.
Detention basin outflow.
Pr8~ depth at tc-
~-:A- ..
Precipitation depth for n-year storm.
..txMJr rainfall depth, for 1()O.year storm.
18-hen! rainfall depth.
.Jischarge at time l
Detention basin inftow.
Peak outflow from detention basin.
Peak discharge.
Dete~ basin storage for a particular routing time interval.
Flow tr1NeI time.
Time from beginning at runoff.
Flow travel time between points A and B
Time of concentration.
Hydrograph rise time.
Rise 'time at the 1DO-year synthetic flood hydrograph for on-sr~
drainage.
Rise time of the 1()().year synthetic flood hydrograph tor an en-
tire watershed.
ROuting time interval.
RunoffwlufI)e at time t.
Runoff wlume.
Estimate of storage volume required for detention.
Required storage volume for retention.
Estimate of total required storage W1ume.
Additional detention/retention basin wlume required to ac-
count for sedimentation impacts.
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Detention/Retenti'on Requirements
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II. Detention/Retention Requirements
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2.1 Balanced and Critical Basins
8al8nced and Critical Basins I8fertDthose watersheds which have been iden-
tified as either already having severe flooding hazards, or having a high pro-
babiJity of increased flood hazards as a resutt of future urbanization. Storm-
_r~ntion iar&quil8d for all newdewlopment proposed within
both Balanced and CrItical Basins. regardless of size orland-use density. The
8Ppropria18 reviewing agency should be contacted for a list of basins
designated as critical or balanced and maps showing locations of the basins.
The future classification of basins as "critica'" shall typically be done 80 in
conjunction with bain-management studies of the affected watersheds.
..lanced ....n
A Balanced Basin is one which has been identified as having the poten-
tial for a severe increase in ftood hazards as a result of InCIWased ur-
banization within the basin. Stormwater det8ntion1r8t8ntion facilities shall
be incorporated within all new developmenls1o the extent necessary to
ensure that. at a minimum, the poSt-dewlopment2-, 1~, and 1QO.year
peak discharges from the site wll not exceed the pre.development
conditions.
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,.....
Critical Bealn
A Critical Basin is one which has been idenlffied as already having S8Y8I8
flooding problems as a result of existing watershed condttions. Storm-
water cletentionlretention tacilities shall be Incorporated within all new
developments to the extent necessary to ensure a reduction in the ex-
isting 2-, 1~, and 1CJO.year peak discharges from the site. The amount
of reduction required shall be deI8rmined by the AIgUIltDryagencywtich
has jurisdiction (pIma County or City of Tucson), and shall typically be
based upon the tkMcapacIty of a critical channel reach or critical
drainage structure located downstream of the stormwater detention!
retention facilities.
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2.2 Threshold Retention
,....
Threshold retention systems must be incorporated within residential
developments which are larger than one acre in size and . planned for three
or more units to the acre, and within all commercial orinclustrial developments
larger than one acre in size. Threshold retention is requir8d in order to mitigate
the effects of urbanization upon Increasing fIoodwatervolumes. as well as for
the purpose of enhancing groundwater-recharge potential. The retention re-
quirement will be. at a minimum,. the YOIumetric d1ffenmce between the
. developed and existing2-year runoff. The volumetric diffentnce between the
developed and existing 5.year runoff will be the maximum requi1'8d to be re-
tained. The 2~ar pre-dfMIlopment discharge must be allowed to exit reten-
tion facilities, if It is necessary to maintain downstream, riparian vegetation.
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The 2-year threshold retention criteria shall apply to the foIIcNring types of
developments: ...
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Threshold rwtention requirements maybe waived in cer1aln cases when storm-
water retention is not feasible due to constrainlS imposed by subsurface con-
ditions(e.g.. close praximityof bed rock orground-watertable). In such cases.
the following detention criteria may be imposed in lieu of threshold retention
requiremen1S. and in addition 10 any other appiicable detention requirements:
ThedetentiDn requirementwIU be, Ita minimum, the difference in wIume
betvMen the dewloped and the existing2.year nmoff volumes or the
dlfterence in peak dischargeS. whichever Is more restricti...., with the dif-
ference in volume and/or peaks between the developed and the existing
5-)'88r runoff volumes being the maximum 1D be detained. The maximum
peak discharge to be released from each detention basin is one (1) cfs
in a drainage basin designated as "balanced" or 'tcriticaltt and three
(3) cfs in a non-designated drainage basin, with exceptiOns to be deter-
mined by Pima County or the City of Tucson. A.percolation test and/or
hydrogeological site analysis is required to validate a request for provi-
sion of on-site detention of runoff in lieu of retention.
2.3 Location Within Watershed
The criteria presented within thiS section of the manual can be used to deter-
mine if stormwater detention requirements may be waived for a particular
development. In certain circumstanees. urt)aniz8lion of parcels of land lOcated
It the extreme downstream end of a wa.rshed will not create increases in
flood peaks before the flow has entered a "major channel:' where the effect
upon any potentiaI.increase in the peakftow rate of the "major channel" would
be inconsequential in any event. For purposes of this analysis. the term "ma-
jor channel" refers to watercourses having drainage. areas of 100 square miles
or larger at the point that the criteria provided within this section is applied.
This includes, but is not necessarily limited to, the following watercourses:
Santa Cruz River
Rillito Creek
Pantano Wash
Canada del Oro Wash
Tanque Verde Creek
Brawley Wash
Altar Wash
14
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However. when applying the criteria presented within this section. approval
by the regulatory agency which has jurisdiction over the affected portion of .
the basin in question must be obtained prior to the classification of any addi-
tional watercourse a a .'major channer." In certain instances, approval may
be granted for other~which demonstrate adequate downstream
capacity to convey the 10C).year flood peak to a logical dOwnStream conch,.
sion under conditions of ultimate watershed urbanization.
"..........
.-
if either one of the two criteria presented within this section are satisfied. SIDrm-
water detention requirements may be waived for specific developments. This
aection applies only to stormwBter detention. Threshofd retention requirements
shall remain unaffected by the application of these criteria. Additionally. a
pnMousIy stated. stormwater detention requiremems may not be W8iYedif
the proposed development is located within _ critical basin and any portion
of _critical chInneI reach or _critical drainage structure is.tocated downsnam
of the development, or if other conditions exist which the County or City
Engineer deem justifiable for requiring detention.
..-
CrIterion 1
Stormwater runoff discharges dtnlCtly 110m the proposed development
into a watercourse which meets the criteria of a "major channeJ," as
defined in Section 2.3.
CrIterion 2
A. Equation 2.1. as expressed below. is satisfied.
B. If the proposed development is located on a secondary tributary
channel of the "major channel" (e.g., Channel 12 of Figure 2.1)
then It must be demonstrated that the seoondarytributary has ade-
quate capacity to convey the future 1()().yearftood peak emanating
from that portion of subowatershed which contains not only the pro-
posed development, but aU areas upstream thereof. For instance,
segment BO of Channel 12, in Example 2.1, must haveaclequate
capacity to convey a 1()().year flood peak emanating from those
area draining into Channel 12 upstream of Point C, based upon
conditions of ultimate watershed urbanization. However. in this ex-
ample,lt would not be required to demonstrate that segment AS
of Channel 11 had adequate capacity, since flood peaks would not
be increased on this "primary" tributary as a result of the propos-
ed development (i.e.. provided Equation 2.1 is satisfied). .
Note: For purposes of this manual, the term "primary tributary" refers
to a channel which flows directly into a "major channel." A secondary
tributary is one which flows directly into a primary tributary, etc. Streets
may not be considered as tributaries.
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Equation 2.1 is expressed as follows:
T + ~' S OAO
~.
Equ8tion 2.1
Where
.~
T.
1QO.)'eartlOwtravel time between the cIDwnstr88m point of the pr0-
posed dlMlopment and the confluence with a WBleI'COUl'le which
meets the criteria of a "'major channel,.' as defined in Section 2.3.
.nHt parameterT shall be catculated bV means of the .'lncremen-
tal time of concentration method:. as Illustrated In Example 2.1 of
this manual.
"If' ·
Rile time of the 1()().year synthetic flood hydrograph for on-site
drainage emanating from the proposed development (for
developed conditions).
Rise time of the 1DO-year synthetic flood hydrograph at its c0n-
fluence with the "rna;orchannel" for drainage ernanatingfrom the
entire watershed. In this Instance. "If- shaU be determined using
the assumption that the entire watershed is fully developed and
uncontrolled (i.e.. Itshoulct be assumed that no atormwater deten-
tionlret8ntion facilities presently exist. or will exist in the future,
within the watershed).
'fr- ·
Note: Equation 2.1 shall only be applied to watersheds having
drainage IIRt8S equal to or .... than ten aqua.. miles at a CO""
f1uenoe point with a "major channel." since the aynthetic flood
hydrograph used for this analysis begins to lose its applicability
as the watershed increases In size beyond this limit.
Peak discharges and times of concentration used in this analysis shall be
calculated by the Pima County hydrology method or the City of Tucson Flood
Peak Estimator Procedure. Hydrograph rile times shall be determined by the
method to be subsequendy described within Chapter III of this manual.
16
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Example 2.1
A eo.acre parcel, proposed for highodensltyurban development, is located
in the extreme Iowerpartian of a .403kcre8Ub-w8ter8hedofthe RJllito Creek,
which has been Identified as aB8l8nc8d Basin. DeterminelfltDl'mw8l8rdel8n-
lion may be waived as a condition of development (see Figure 2.1).
....
-
-
r-
I. Applying CrIterIon 1
The parcel cIoesnotdi8chargedir8ctlylrma "majorch8nne'" (i.e.. RiUItD
Creek); therefore, Criterion 1 is not satisfied. tn this instance. Crrterion
2 must be examined. If Criterion 1 had been satisfied the detention re-
quirement would have been waivecI. and no further analysis would be
necessary.
II. CrIterion 2A
..
-
-
~~
.....
Calculate T: Byapplicltion of the Pima County Hydrology Method. the
fallowing times of ccmcentration (tc) are cafculated tor fuHy.c:teve1opecl
W8I8rIhed conditions.
-
Channel"
'c. at Point A . 81 min.
'c at Point e . 57 rMI.
Chenneln.
Ie at Point B - 25 min.
'c at Point C - 17 min.
..
-
~-
The trawl time through the reach of Channel 11 located between Points
A and B (TAB) is calculated by subtracting the times of concentration at
these two points:
....
TAB - 61 - 57 - 4 min.
The traveltime through the reach of Channel 112 located between Points
B and C (TBC) is calculated in a simiJar manner:
-
Tec - 25 - 17 - 8 min.
The total traveltime mtor use in Equation 2.1 becomes the sum of TAB
and TBe:
...
T - 4 + 8 - 12 min.
-
....
Note: Incremental travel times are calculated for each channel segment
located between the "major channel" and the subject parcel. The total
travel time m is then calculated as the sum of the incremental travel
times.
-
.....
/)pJ!.-f
17
Calculate 1;' :
By applying the Pima County Hydrology Method to the on-slte runoff
from the eo.acntparoel (usumingde\lelaped conditicX1S). a time ofean-
~.b'" of six minutes isobteined. Thiscorresponcls to a rise time.
1;' , an the synthetic flood hydrograph of 1. minutes.
Calculate". :
A value of 1; · . 53 minutes is caJculated for the entire 4Q33-acI'8 sub-
watershed at Point A (assuming fully-clevelopec:l watershed condi-
tionS). in the same manner as 1;' wascalculatec:lforthe EJO.ecr8 parcel.
Substituting't 1;' ,and 1;- into Equation 2.1 yields:
i6
T + Tr' . 12 + 1. . 0.49-
,,- 53
Since this value is greaterthanOAO. detention requirements would not
bewalYed forthls development. In adcltion,lftne value h8d been less
than or equal to 0.40. the detention requirement would only have been
waived if it could be demonstrated thai the capacity of the reach of
Channel 12 located between PQints Band C would be adequate to con-
veythe tutu~ 1QO.yearflood peak predicted to occur along this INCh
which emanates from the drainage area Iltuated upstream of Point B
(i.... Criterion 28, as described on page.. must also be satisfied).
;;..:
18
!ii
~~
-
I.
-
-
Sample Watershed
for Example 2.1
Scale 1" -4000'
Figure 2.1
-
I
--........... "'
~ ~-~ )
,,~ /
/ .-/ (
~.,
l / ~MJ )
\ "- (Primary) (
:;;.lIl'1'
-
,
,
,
-
-
-
I
,
I
.-
-
~fijl"
...
,-.
I (Seconda~)
I
I I
I I
I
t // ~~ Proposed Development (60 acres)
"\ I. _ -
\ ~.,." C
\
-
.-.,.
Total watershed area
at point A-4033 acres
..
lI>.
~ Major Channel
...
19
-
.:)
tJP 2d, '.
2.4 Retention Feasibility Map
The Retention feasibility Map included within this manual (Figure 2.2) is in-
1endecI asa general guide for the planning of retention aystemSwhich include
. facilities for disposing of stormWater runoff into the subsurface (e.g., drywalls,
engineerectbUin floors, infiltration trenches, etc.). The information on soil
permeabiUty rates is very generalized, and is not intended to be used for
design purposes. Rather, lis intent is to provide an indication of the relative
feasibility of utilizing infiltration facilities for stormwater disposal. Pen:ola-
tion tests will be required on a slte-by-slte basis to obtain permeability rates
which are to be used for fma' retention facility design. The permeability
ranges provided herein are tor near.surface soils only (i.e., zero to five.foot
depths). Therefore, they are notapplicabJetodlyowell systems, whichtypicaJly
penetrate into deeper strara.
20
:-
..)
,t/~.2-7
~ ~ (/) ~ N
II)
f= 1= f=
w
<Xl
li
w
.....
ii:
w
CD
ii:
w
ll')
li
w
v
li
w
'"
ii:
w
C\I
li
i# ~I;
li
w ~l
0
ii:
.'
w Ii
Ol
ex:
w
<Xl
ex:
w 11
..... ~
ex:
(/) 0
(/) -
.!! Gl
-
?d 0 a:I
- ...
a:I := Gl
... "
CD 0 >. 0 >-
c:: u; E ~
CD ;t::
0 CD= CI) CD:Q
>.0 > > co (/)
rn a:I co co a:I Gl ~
.s= .s= Q) .s= .s= E
- ~E >. ~
a.' .2:-~ >-...
CD':': tii Gl - Gl
"g a. tii:o tiio. 0
... ... ... a:I ~:2 T""
~ =" Gl := CD CI)
o CD c:: c:: E c a.
g (/).0 CD.2 CD ... Gl co
Q) := 0 o(/) OCD 0'"
.0 ;g .2- .s= >- .s= a. .s= >- Gl
0- .2 Gl 0- ;g
"(j) (/) tii- '- CI) ._ CD
a:I .s=1O .s= - .s= _ .s=- rn 10
as CI) (/)('1) := ~ := ~ := ~ a:I
Q) U. >-c:: (/) Q) rn CD rn CI) Q)
u.. - ... co =" ="8 =" u.
rn Q).s= o 0 ~E o 0 -
a:I >- CI) E CI) E rn
s::: CD 0
0 C\I ...J >~ 0
+:: C\I D 0 I ~~
s::: "0
Q) (1) r::
r.... (1)
- ::J
Q) 0> 0>
a: Ii: (1)
...J
2S Depth To Groundwater Map
FIgUre 2.3 provides depth to ground water information for eastem Pima Coun-
ty and the City of Tucson. This map is provided to aid the reader in assess-
Ing retention feasibility with respect to the criteria regarding the proximity of
retention-facility dl8posal points to the groundwater table. This criteria may
be obtained from the Pima County Flood Control District, or the City of Tuc-
son Engineering Division. Figure 2.3 of this manual will be updated
periodically to reflect future changes In groundwater levels. Either the Of-
fice of the Pima County Engineer or the Office of the City Engineer should
be contacted to obtain any current updates to this map, as they become
avalla~le.
22
(}p).f
(f)
"'"
t=
(f)
U)
t=
,"-.
(f)
<0
t=
--
-
-"
UJ
<0
a:
."...;.-
UJ
U)
a:
t-
. ...;- i
.' ',.c',,'"
";tt~'",
/:t'..o,g."'~l>-
'r"~~:', :G~~',~'/, ~~.... .-..
~ J~~,'"" r
^ i~~D. '
"~"j'8fi,f;,
vi- ..': :( ~
{,""~' ~.
" ,
<-, '.... 8
'............._.::-:.~'i~
_-...___-_.~I',
.../- N
).<- ."
UJ
"'"
ii
UJ
~
a:
w
C\J
a:
z
0'1
i ,: z ..;;-j
~ ~ ~ ~ ii( i ~ '! ~
~ .. \' 2 Z '. "
'\' \ ,tel!< - :.
'\ \ \ \ I " 'Ill I
'{'\\\II\ S"r
_~l\;\H ~': ' - ,- , ". '
\\\\~~~ ' ;,
\':\." \~) ,'\
:'-.. "~~~"~" "
M . ':.::s~~~
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.~
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o
a:
UJ
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-
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(I) ca
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as
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(!) .E
o en
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CD.
c::c\/
:: 0 (])
Co en ~
(I) (.) ::J
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8
...
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c::
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-.J
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. ._-~
<:~ ..... ~
R?
t=C()
co
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,...
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F"
Design Criteria and Procedures
,...,
--
,..:"
~
... .- .~~_<~~'~:i;
.:~-~;;;;f!0;;:;~~~~~~~-:-.__..._.__.-
C')
:I
>
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-I
m
:%)
-
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-
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-,....:..
: .~:.
- ,
~...~,.~-: -.~::
_..-...:.llI'~_t....,........._
-~
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-
I :
-
I'-
III. Design Procedures and Criteria
,.-
This chapter provides certain procedures, equations. and data to be used
in the anatysis and design of detention/retention facilities. The topics addres-
sed herein consist of: 1)determination of hydrotogic parameters: 2)design
of detentionlretention facilities; 3)sedimentatiOn impacts; and 4) criteria tor
specific types of detention/retention facilities. The analysis methods
presented within this chapter are to be applied todetentionlretention facilities
which intercept runoff from drainage areas no greater than one lIqu." mile,
unless specific authoriZation to the contrary is granted by the appropriate
reviewing agency (i.e.,. either Pima County or the City of Tucson).
-
-
-
3.1 Hydrology
-
3.1.1 Preclplbdlon
-
...-
Table a1 of this manual provides a tabulation of one-hour precipitation
depths which are to be used in conjunction with the anatysis and design
.01 detentionlretention facilities within Pima County and theClty of Tuc.
son. The precipitation vaI.ues provided within this table arem be used
with bOth the Pima County and City of Tucson methods tor estimating
peak flOWS, as well as with the various analysis methods presented
within this manual. It should also be noted that the procedures
presented within this manual are strictly applicable only tor those water.
sheds which will be controlled by detention! retention measures that
have drainage areas which do not exceed one square mile in size.
-
-
3.1.2 Peaks and Volumes
Peak-discharge rates to be used in conjunction with the design and
analysis of detentionlretention facilities shall be determined by use of
e1therthe Pima County Hydrology Method or the City of Tucson Flood
Peak Estimator Procedure, whichever is applicable. The rainfall values
used with these prOcedures shall be those provided tn Table 3.1 of this
manual.
-
-
Rainfall Depths of Various RettJrn.Period Events
for Watershed Areas Up 1b One Square Mite
in Pima County, Arizona
-
,.....
Return Period . Rainfall Depth (inches)
(Years) 1.Hour 200Hour s.Hour
2 1.10 1.25 1.32
5 1.50 1.71 1.80
10 1.90 2.17 2.28
25 - 2.30 2.62 2.76
50 2.70 3.08 3.24
100 3.00 3.42 3.60
-
-
--
Table a 1
..
25
-
/!-
LJP.J j..:,
The total volume of runoff from a flood event shall be d8t8nntnecl from Equ.
lion 3.1.
v. CwPnA
12
equatiOn 3.1
Where;
v . runoff volume. in acre feet:
Cw. weightecl runoff coefficient;
Pn. n-hour precipitation depth. in incheS; and.
A . Watershed area. in acres.
Nate: The methods ofctetermining 1Iood peaksandvolumea pnl88nted
within this section are only applicable when no upstream detention
measures exist. If upstrearhdetention does exISt. then either Method
B of Section 3.1.3 must be used: or, computer modeHng of the water-
shed must be employed.
3.1.3 Inflow Hydrographa
Method A
The following method shall be used to generate. synthetic flood
hydrographs for the purpose of flood routing. detention-basin design.
and other procedures contained within this manual which. require
hydrograph analysis. This method. is only applicable for watersheds
which a)are uncontrOlled (i.... no upstnNUn atormwater detention ex-
i515); b)are hydrologically homogenous; and c)have a drainage area of
less than one square mile in size.
1. Peak Discharge '(Cpl. Auncf.f Volume M. and Time of Concen-
tration (Tel for the design ftow(s) are to be calculated by the
methods described within Section 3.1.2 of ttIis manual.
2. The hydrograph Aise Time (Tr) is determined in the following
manner:
a. "For Tc :s; 60 minutes. read the corresponding value for
T r from Table 3.2.
b. For Tc > 60 minutes, determine Tr from the following
equation:
26
/JoE
.......
:.;;
IJP:;11
-
-
-
-
Zl
-
Hydrograph Riae Tnnes for Tc :Si 60 Minutes
(Tc and "Ii- are In minuteS)
Table 3.2
Tc " Tc Tr
5 13.6 33 31.9
6 14.2 34 32.3
7 15.0 35 33D
8 15.8 36 33.5
9 16.6 :rf 34.2
10 17.5 38 34.7
11 18.1 39 35.2
12 18.7 40 36.0
13 19.4 41 36.6
14 19.9 42 :J1.2
15 20.7 43 :J1B
16 21.3 44 38.4
17 21.9 45 38.7
18 22.5 46 39.3
19 23.1 47 40.0
20 23.7 48 40.4
21 24.5 49 41.1
22 25J) 50 41B
23 25.7 51 42.2
24 26.2 52 42.9
25 'D~ 53 43.3
26 'DB 54 47
'D 28.1 65 44.5
28 28B 56 ~
29 29.3 57 45.4
30 29.9 58 46.3
31 30.7 59 46.7
32 31.3 60 47.2
28
o"i
f)tJ~.>"-
-
I !
~
-
-
.-
Ratios for Generation of F . a County
Synthetic FJood Hydrograph
-
.....
tnr qlGp vN t/Tr qlCp vN
0 0 0 1.6 0.545 0.671
0.1 0.025 Q.OO2 1.7 0.482 0.707 .
0.2 D.087 O.om 1.8 0.424 0.742
03 0.160 Q.02O 1.9 D.372 0.773
0.4 0.243 D.036 2.0 D.323 0.799
Q5 0.346 Q.063 2.2 0.241 0.841
0.6 0.451 D.096 2.4 0.179 0.875
0.7 0.576 0.136 2.6 0.136 Q.9OO
o.e 0.738 0.180 2.8 0.102 0.917
D.9 0.887 0.253 3.0 O.o7B 0.932
1.0 1.000 0.325 3.4 D.049 0.953
1.1 0.924 0.400 3.8 o.oso 0.965
1.2 0B39 0.464 4.2 0.020 0.973
1.3 0.756 0.523 4.6 Q.012 0.979
1.4 0.678 0.578 5.0 O.oos 0.983
1.5 0.604 0.627 71) 0 1.000
-
-
-
,.,-,".
-
-
-
-
Table 3.3
-
Method B
For those cases where an inflow hydrograph must be determined from -
a watershed which does contain upstream detention facilities, the
following simplified method may be employed. The method is
presented in example format, and considers only one detention basin -
. .
within the upstream watershed. If more than one upstream detention
basin exists, the same procedure should be applied In a systematic
fashion from the upstream-most detention basin, downstream to the -
point of interest. Referring to Figure 3.1, the following procedures shall
be employed:
- 1. Determine the outflow hydrograph from the basin located at Point -.,..
B for the design storm under investigation. This information can
be obtained from the design analysis performed for the basin (if
.- available), or from the reservoir-routing method presented within -
Section 3.3 of this manual.
2. Compute the flow travel time between Points B and A (i.e., TBA) -
using the incremental time-of-concentration method presented
within Section 2.3 of this manual.
- 3. Generate a hydrograph (using Method A of this manual) for that -
portion of the watershed upstream of Point A, but excluding that
portion of the watershed which drains into the detention basin at
Point B (i.e., excluding sub-basin B of Figure 3.1). -
.~~1
29
-
tJod
/\
/
'\.Sub-BlISin B I
. I
", I
" I
I
I
( ,
@:,~ ExistingIPlanned "
,
-'
Sample Watershed
For Method B
Figure 3.1
30
\
\
\
I
t
, .
..)
/)~:J-1
-
~,
-
-
Hydrograph Determination
- by Method B
Figure 3.2
-
-
Legend
..-
-
--- outflow hydrographft1 from detention basin at Point B
-
-
hydrograph #2 at point A, with no contribution from sub-
basin B
-
hydrograph at point A, considering contribution from entire
watershed (sum of hydrographs #1 and #4).
-
,,-.
....
I-
-
-
..-
-
o
-
~,
31
-
f)p;I' '.
4. The actual hydrograph at Point A is the sum of the hydrograph
generated from Step 3 of this procedure and the outflow
hydrograph obtained during Step 1, lagged by the traVel time TeA
calculated during Step 2. This procedure is most easily ac.
complished graphically, as shown in Figure 3.2 of this manual.
3.2 Retention
3.2.1 Required Storage Volume
The volume of storage required to satisfy threshold retention criteria
shall be calculated by the following method:
Vr · ...!. (Cwdev - Cw.> P1A
12
Equation 3.3
Where,
V r . storage volume required, in acre feet;
Cwdev. weighted runoff coefficient for urban (i.... developed)
conditions;
CWex. weighted runoff coefficient for existing site conditions;
P, . one-hour rainfall depth for the 2.year or 5-year storm, as
determined from Table 3.1, in inches; and.
A . drainage area. in acres.
Note: CWdevand Owex are to be determined from the Pima County or
City of Tucson hydrology procedures. However, estimates of these
runoff coefficients may be obtained from Table 3.4 ofthismanuaJ only
for determining ~liminaryvalues of required retention storage. Addi.
tionally, the drainage area (A) in equation 3.3 refers ontyto the area be- .
ing developed (i.e., the on-site area).
3.2.2 Method of Diapou.
The p~erred method for dispOsal of retained runoff is by infiltration
into the subsurface. Various options for accomplishing this include dry
wells, eng1neered basin floors and trenches. perforated pipeS, and 1and-
scape irrigation. Specific design criteria and references for these types
of facilities are included within Section 3.5 of this manual.
In locations where infiltration is not a feasible method of stormwater
disposal, additional detention may be required, as described in Sec.
tion 2.2, or pump systems may be used. Such systems will operate in
32
/)pH
-
-
-
such a manner1hatthe retained stormwaterwiJI be slowly f81eased from
the retention basin 8fter natural runoff hasceasect. Guidelines regard-
ing rates of release of runoff are contained within Section 2.2.
Runoff Coefficients
-
RunoffCoefficlenlS Runarf CoefficiInIs (Ow) mr Various 0egrIIs at LandUle Upon
(Cw)b~ AppIlc:abIeSol.Types in Pima Caunty InCl the City of 1aon
Return 1'1 SoiI'FJpes in Pima Co. (peIaIN in.pIIIIIItheIis ......1IIIOUIIl m impervious cowr)
Interval end the City of Tucson
(1(M) (20%) (<40%) Mod. r"~) Hvy. (9Ollb)
FUaI SuburbIn Urban ~ eornmAnd.
B C D I B C D 8 C D 8 C D 8 C D 8 C D
2..year 1.1 D9 .19 .28 .90 .17 .26 .34 .25 .33 .40 A1 A7 .53 .66 .69 .71 .82 .83 .84
.
5-year 1.5 .24 :J1 .46 .92 .31 AS .51 .38 AS .55 .51 .59 .64 .72 .76 .78 .85 111 J!T
1().year 1.9 31 .50 .59 .94 .43 .54 .63 .48 .59 .66 .60 .es .73 .77 .81.84 .88 .90 .91
25-year 2.3 .47 .59 .68 .95 .52 .63 .71 51 .66 .73 .66 . .73 .79 .B1 .84 S7 .90 .91 .92
50-year 2.7 .ss .66 .74 .96 .59 .69 .76 .63 .72 .78 .71 .78 B3 .84 1f1 .89 .92 .93 .94
1()O.year 3.0 .60 .70 .77 .96 .64 .73 .79 E1 .75 .B1 .74 .80 .85 .85 .88 .90 .92 .93 .94
,-..
,.-
.P1 · one hour rainfall depth. in inches.
Table 3.4
3.3 Detention .
3.3.1 EstilNltlng Detention $torage. Volume
The equations presented within this section are intended to provide
estimates of storage volume required for various types of detention
facilities. The f8SUIts obtained from applying these. equations 8f8 not
suitable for design purposes. These methods are only intended to be
used for obtaining preliminary estimates of required storage volume. and
for providing a "starting point" for the reserwir-routing techniques
presented within the next section of thiS manual. The storage.volume
estimates obtained from Equations 3.4 to 3.7 can generally be expected
to yield values within :20 percent of the results obtained from detailed
reservoir routing. ForthiSf8ason, it is recommended that a factor of 1.2
be applied to the values obtained from the equations, when assessing
preliminary site feasibility. A factor of 1.30 should be applted if signifi-
cant sediment inflow is expected in the basins. However, for design pur-
poses. the actual amount of additional volume required to account for
::^
/}~~~"
~.
~.
-
-
-
-
-
-
-
-
-
-
-,
-
.-rt!I
33
-
118d1rr.(itatiOn st1aIl be delerminedbythe method dMtrlbed wtthin Sec-
tion 3.4 of this manual. Note that storage-vOIUi'ne estimateS should be
calculated for both 1CJO.year .net 1C).year runoff events since, in some
instBnCIS. the 1o,eerltorm may require rncn~\'OIume
than does the ,~ storm.
Figunt 33 of this manual provides. grsphical represe.ltation of the in-
fIowftiutIIow ~ Which Went utilized in dtMlopIng Equation 3.4
to 3.7. For the .... of alrnpIicIly. and wIthoUt the.kJIs of aignlficent ac>-
curacy. the hydrographs uHd to develop these equationawere
represented as triangles. However. tor purpa.. of I'ItI8rwir rading and
final detentiarHMlsin design. curvUinear~ (IS dIMIaped from
the methods described in SectIon 3.1.3) shall be &med.
1ype I: "On-line" Detention Basin WIthout R81ention
The simplest type of detention basin Is one which Is constrUCted "0n-
line" r.....lntercepting the entire flow from the upstream watersh8c:I). with
the Invert of hi outlet structure at the level of the basin floor. However,
use of an ''on-line'' baSm requires appmvaI of the appropriate review-
ing agency. Equation 3.4 is the mathematical relationship to be used tor
estimating the volume of storage required for this type of baSin.
Va · CwPt A
12
[-~J
Equation 3.4
Where;
Vs. estimate of required storage volume. in acre teet;
Cw. weighted runoff coefficient of the upstream watershed for the
design storm under investigation; .
Pt · t-hour rainfall depth fOr the design storm under investigation,
, in . inches~
A - watershed area, in acres;
Co. detention basin .outflow, in cfs: and,
Ci - detention basin inflow.. in cfs.
1YPe II: "On-line" Detention Basin WIth Retention
(Applicable only for watersheds of 100 acres or less).
This is a Type I detention basin. but which also leMtS as a retention facili-
ty i;e., retention storage is provided below the invert of the lowest outlet
structure. Equation 3.5 is the mathematical relationship to be used for
estimating the volume of storage required for this type of basin.
34
:.~..
MY/
-
J .-"
-
-
-
-
\Is - CwPt A
12
-
-
-
"....
---
,-.
1 - 00
-
Qi
1- [ Pn
3 C w Pt
1
(Cwdev - Cwoxl J2
-
-
Equation 35 ~,
Where; -
CWdev weighted runoff coefficient for the proposed development, c0n-
sidering urbanized conditions for the n-year storm (2 :s n :s 5); -
CW.- weighted runoff coefficient for the proposed development, c0n-
sidering existing conditions for the n-year storm (2 :s n :s 5);
-
Pn · precipitation depth, in inches, for the n-year storm (2 :s n :s 5).
Symbols not otherwise noted are defined as in Equation 3.4. -
Type 1ft: "OMine" Detention Basin
An ''off..fine'' basin is Iocaled near or adjacent to a channel 6s.. the channel
does not flow directly into the basin). Typically, inflow to ttw '&Sin is acc0m-
plished by means of side weirs, or other CMtrflow structures, and begins Only
after the channel stage reaches a minimum height. Stored water is returned
to the channel by means of a smaJk:apacity oudet structure. This type of facility
may only be implemented adjacent to a prismatic channel which has been
stabilizBd both horizont8Ily and vertically (e.g.. a concrwte channel with a
trapeZOidal or rectangular cross section). An off-tine detention basin general-
ly has the advantage of requiring leSS storage volume, for a cenain NNeI of peak
reduction, than does an orHine facitity. Equation 3.6 is the mathematjcal rela-
tionship to be used for estimating the volume of storage required for ''off-line''
basins. which either may or may not include "off-line" retention.
-
-
-
-
-
Vs - CwPt A
12
[ 1 - 00 [.
OJ
JJ
-
-
2 - 00
OJ
Equation 3.6
-
Symbols not otherwise noted are defined as in Equation 3.4.
-
35
A'
/)P"~
Graphical Representation of Inflow/Outflow Hydrographs
for Type I. II. III & IV Basins
Figure 3.3
Type I
Q
~.....
..........
..........
.........
.........
.........
Time
Type II
Q
...........
.......,
......,
............
,
Time
Type III
Q
00
~.....
..........
...........
......,
Time
Legend
Inflow Hydrograph
-- -- Outflow Hydrograph
V d Storage Volume Required For Detention
V r Storage Volume. Required For Retention
V s Total Storage Volume (V d + V r)
36
;.\
~-() t''' /1
generalty need to be represented. Check the working CLINe to en-
sure that it does not exceed the "eQual-v8J~" line at any point
on the curve. If It doeS exceed the o'equal-valuesulineo the routing
time interval (A t) Is too large. Reduce the routing time and repeat
Step 7. The o"equal-values" line refel8totne locus of points on the
workingcurwthatSBtiSfytheequatianSl~t +012 -0. 0 (see
o Example 3.1 Step 8).
9. Prepare the routing table and perform the routing. The de81red
outflow hydrograph results from this ..p.
10. Prepare a graphical.rwpresentation of the inftow and outflow
hydrographs tor each flow anaJyzed (e.g., 2-, 10- and 1000year
flows).
This routing procedure (i.e., Steps 3 through 9) may..... to be performed
numerous times, with different baSin and outlet configurations. until the
required degree of multi-leYel, fIoDd.peak reduction is attained.
Example 3.1
A neighborhoDcl detention basin is to be designed In conjunction with
a35-acr8 aparIm8nt development, which is proposed lObe ~wtthin
a critical basin. As a condition of dMlopm8nt, the regulatory agency
requires that peak flows must be reduced to as percent of the existing
2-, 10-, and 1DO-year peak values. Estimate the maximum required (i.e.,
1()().year) detentiDn-basin volume. chDDIe an oudet configuration, and
perform the ftood.routing computations for the 1~ flood event
(retention storage will beigncndfor this example).
Step 1 - Compute the uex....ng.. and "Urbanized" Flood Pulls
By application of the Pima County Hydrology method, the following
hydrologic data is obtained:
From Table 3_1 of thIS manual, the ~ 100.yearprecipi1atiDn depth
(P1) · 3.00-_
The Watershed Area (A) . 35 Acres.
Existing Conditions
Urbanized Conditions
Impervious cover . 10%
basin factor (nb> . D.035
weightecl runoff coefficient COw) - o.es
time of concentration <Tc> - 12 min.
peak flow (0100) . 173 cfs
impervious cover - 70%
nb · 0.020
Cw-Q86
Tc · 5 min.
0100 - 317 cis
Peak outflow (CO> from the detention basin for urbanized conditions, dur-
ing the 100-year flood must be limited to Co - .85 (173) . 147 ct&.
38
..J
.~r~
-
~'
-
-
,.-
Step 2 - Develop the Dealgn Inflow ~h
The foUowingtabularhydrograph lsabtainedfrom the method presented
WIthin Section 3.1.3.
-
..-
RIae Time ('1;) . 13.6 min.
Peak Discharge (OP) . 317 cfs
Synthetic Inflow Hydrograph for Examp6e 3.1
-
-
Time Discharge Time Discharge
tmin} ecfs} tmin) Icfs)
0 0 28 94
2 17 30 75
4 50 32 81
6 91 34 50
8 140 36 40
10 202 38 32
12 274 40 ZT
14 309 42 23
16 272 44 19
18 233 46 16
20 198 48 14
22 169 50 11
24 140 52 9
26 115 54 8
..
-
-
-
~<
-
-
-
Table 3.5
......;
Step 3 - Estimate the Required Stonage Volume
--
Equation 3.4 provides an estimate of the fequifed storage volume for an
"on-line" detention basin without retention storage.
-
~ - ~ CwPI A ~ 1 - ~ ]
-
-
-
Therefore.
-
~. 1~ (B6)(3)(35) [ , - : ] · 4.0 acre-I8et.
-
-
39
-
/'
tJb 'I.>
By applying a faCtOr of 1.2. the preliminary estim8tetor.lOoCBIled "first
estimate," of stOrage volume beCOmes 1.2 x 4.D · 4.8 acre-feet
-
M a first approximation. a baSin haYing a surfaCe ... of 8bOUt two
acres. a bottOm area of abOut 1.5 acres. 8:1 side 8lapes. and a depth
of three feet is chosen. A primary outlet 1b'UCture. consiSting of a twO-
cell. five-foot~, three-foot-high concrete baK culvert Is atso chosen.
This partiCular outtet strUctUre will just corwey the required 147 cts at
a depth of three feet. AdditioMJly. the bUin will store about five acre-
feet of atormwat8r at a depth of thrM teet.
Step 4 - Develop the Stage-Stcnge RelattoMhlp
Based on the assumed baStn configuration, a stage-storage relation-
ship is developed by calculating storage volumes for variouS depths in
the basin. This relationship can be expressed either graphically, or in
tabular fonn, as shoWn in Table 3.6.
Stage-Storage Relationship
for Example 3.1
StagelI)epth Storage
0 0
o.s 0.76
1.0 1.58
15 2.40
2.0 3.28
25 4.20
3.0 5.16
Table 3.6
Step 5 --Develop the Stage-DisCharge Rellltionshlp
From hydraulic design charts prepared by the Federal Highway ftd.
ministration (23. 24). a .ge<lischarge relationship is developed for the
assumed outlet structure (IA. a two-eeU. tr.foot.wide by three faol-high
40
.'~'
t?1J t/ t
-
I I
-
-
-
-
cao). For convenience In dlMltoping the storage-discharge relation-
ship (see Step 6). the same stage increments that were used in Step
.. .,. used in Table 3.7.
Step 6 - Develop the Storage-Discharge Relationship
..
By combining Tables 3.6 and 3.7, a storage-discharge relationship is
obtained as shown in Table 3.S.
-
Storage-Discharge Relationship
for Example 3.1
StageJOepth Storage Discharge
(fU faf) (cfs)
0 0 0
o.s 0.76 9
1.0 1.56 30
1.5 2.40 55
2.0 3.28 85
2.5 4.20 115
3.0 5.16 . 150
-
Step 7 - Select the Routing Time Inte",., (.6.t)
.6.t ~ 0.1 Tr
0.11j. - 0.1 x 13.6 - 1.36 min.
choose .6.t - 1.36 min - JJ2Z1 hIS.
,....
op~?
-,
-
-
-
-,
Table 3B
-
-
-
41
-
Step . _ .....pant the Waddng ......
A working table for the routing time interVal (At) is prepared as
demOnStraI8d In Table 3.9.
(1) (2) (3) (4) (5) (8) (7)
Stagtt/Depth Outflow (0) 012 Starage (S) SlAt SlAt + Qt2
(tt) (cis) (cts) (cfI) (c:I8)
at (cf8.hra).
0 0 OD 0.00 QO 0 0
QS 9 4.5 0.76 9.2 406 410
1.0 30 15.0 1.56 18.9 833 848
1.5 55 %1.5 2.40 29.0 1281 1309
2.0 85 42.5 3.28 39.7 1751 1793
2.5 115 57.5 4.20 60.8 2242 2300
3D 150 75D 5.16 62A %155 2B3O
WOrking Table for Example 3.1
(At - 0D227 hrs)
Table 3.9
.1af - 12.10 cf&.hrs
(2): from Table 3.7
(3) - (2)12
(4): from Table 38
(5) - (4))( 12.10
(6) - (5)1At (At in houns)
(7) - (6) + (3)
Step 8 (cont.) - CoMtlUCt the Wortclng CUrve
The working CUMJ is a graphical representation of the relatiOnShip a.
tween (SlAt + 0J2) and 0 (from the working talM). Generally. It is more
conwmient to plot the working CUIW on logarithmic graph paper. The
line of "equal values'. ShDUld alsO be plOtted. If the working CUMJ ex-
ceeds this line at 8fP/ ioeation. a smaller value of At should be selected.
and Steps 7 through 9 repeated. The working curve for this example
is provided on Figure SA.
Step I - Prepare the Routing Table and Pertonn the Routing
The routing table and the routing procedure for this example is illus-
trated in Table 3.10. The resutts of the routing Procedure indicate that
the 1O().year peak outflow from the assumed detention would be 113
cis. at a storage volume of 4.14 acre-feet. Since the requirement is to
42
,:/
/)/)~ i
-
-
-
,-.
....
-
,..-
r
o
(cfs)
_WI'!
-
1000
;": i
, ;;.::;~ (1000, 1'!OO),
" ,I'i'
,.. :;]..
;:i ;:::j::
...,...;.;.--
-
, : :
I !
I
, : ,
: .. ..
I ,
, .. ,
I.:
;l;j
fl. "
.. -: '~~t .. . i~HI:~:i ~:-i~
: : l;i ~ =:1: ~nj En ~~~'; ~ ;:'~ ~ ....1 ::i
..,. __: ~::t :j:i !,..,:., I..";, I ..
..u .t~t ':1' ;~:~ ; ~n': I:':~ .Jt:
: I
;,":
500
I . I : ~ '11; ,:411"1~ "iti:.jiIIIf ':'f' ;;... .,,-..- I. I ~tt ~ '.i j;.; "t.t; li.1 ".j
.- ..-- - .. ;..,~!- I':~ ~;i; ~~;;lt' "tlr~ll h;.r ::11 r.";.~ F ,-:..- : :.; ~'.j': .'.1,. -'l'~! ',.,',:'. .:',:1. :,:.'.'1
- '1 ". ..4-; ..,~ .TIt "", .m....r-t. tri~" 'i,' '-, ..,.-t-.~. ,-.... . . . t
.. ... -I~" ;:;~::. .~ ;...r: - Tr:~ EiH mil>>rrli:i:i! f.ll: :;.,.j r.:! ;~' :-:= _ .....' ;;i";;:' .LU! ; i Hii ::t1 ('Hi!
_ . 'H .:"_E:-='-:~: _:;: t.m iFf ;:u. I' 1.?.J1l~i bfti tilt itl. d':~. ~-:c '1.: .=:;!.::':i . :'U j ;;;-n Hti ~W l~j ih:
. ...... ..-.. .:.J;.'---' '.~' i+,t(.. .. ~ .." - _-~'_':::. ;;;'~~7...t~1- ~ ..~.tl' .' '......1. 'I :"', ".'
I~::':::= ~ ::1:!'!:::n " _ _ "..-.
-" -- -"'---,..
._~ - ~t...... 7 =
:":""~-.-- .....~- ti, "TTt't ~
:;:-.
-
-
:::;::,
j
*,
-
l '1 11
.
-
100
I "
...J,.... "
,
G I,
17!...., t I'
:100 100 =-
:.....-..!...~ =-~
=..
Line of ~~al Values.
, I
-
.?'-
...
-::T.
=1:
f
1: t~.
-
50
- .. -,-
:-::"l.._,,""~ -~~J=~
r=:.t:=l=:.:.=;: ;b::;: ....++,
-~~.,..- -' ~
--~ ;-",~....+=t::=... .....'.
- , ....,..
;t
ij
-.
~ f'
a ..
-.t
. .
,.- ....
t
:~.--::;... EE .-:i.,,;... ::: ~' 1: _: -
=~::-._-- on.:... 3i:HJ ::
at!
,'~~.'
=--
-
to...:
-
-- . -. .J
- - : .
.- . .-..
-
.....~
.... -. f -+
-
~
,
I
,
, , ,
-
++++
WorkingCuve ,
-
10
-
.. .{-;;._ ...idirf ff;.; :....:::iliriirtj;,;":i' 'n_. "-:!";'j'~-J,",fi ;!:: \hi ill I.
-j '. .....1: IT ~,I' ~f{f W~ :::1 !;~11d~ ;ih ;;rl i,l. .rH !......!-. X~.~~i :~l;j Fi'i n11 Wi [j 11
.;.',_.:1 .. ;11'1:~~', ;i',.,' '1',I!, I.....;'! t~l': ;.'1:" ,.-, ;:['. 1 ........ -. J, ::11 :.I:!: :i
..0- '. :... ,. ::: 1 ...~ ~ __. .... _ .,.... H . not "'~ ...1. . .'.~ .:.:.. :,:.%.J ;;~-i; i i:' ! L~H :1t! I:
-.::.:-;:_1 ..: :-j :.:~~ iUi ~g :!!! !ti: . lIfi i!;: ~;;l ~* -1~ -,. :';:H;l T!!! nil HH jjii il! iI.
::-:':":.~ .._;:.::;:,:;.;,r~ :':1; ,.tt'!H[j~I~I': Gl~ri;:;'!!i!r::'1;';L~'~1'-L;.:.:;.;r:~"fl [141 Ii ~Iqilll:ll:
.:=::..--:~ ::~-=7:"r:t -....tj. ;:;l~ ;~t ~ ;1tJ ~! rn~ .~rr! :.:.t ~~; tt:: =~.. r:.:.:.. -=i..q-.. ..t.=: r fl!; r. t~ n~. HH
'.::, '":'". -'- .: ~!-b :.:"~j ill~ 'lH 1':'.'1' ~:~.."'": Iwi =: 'r::~' t~r':::' 7;' ~"-:r- 'I~i: i'.-r:,'! lill .~'" :l'.i~
;~~~~:~ ____I ':~:t~;': ii!i%m. '~~::;l~~tii ~,. .t:.~~f;~~~~1~1..j4,:1;1'iT,j tit IIf.f.I:'I;llfh
. -f.. .__ = '!:ifJ::.:.:.: _, :~:..._ illiI _-:J::t:::::.=:!':i"t':!:' I';~_. U ._. iW I..
I
-
5
-
100
5/.6.t + 0/2
(cfs)
500
5000
Working Curve
Figure 3.4
-
1000
>
~
43
,
:,~
tJ()~1
provide a maximUm 1~ outflow of 147 cfs, this balinconfigura-
tion is eomewhat over-designed. Steps 3 through.9 may be repeated,
wtthmodlfied bIIinIOUtIet configurations. until an optimum design is
achieved.
.. 10 _ ........ GI8phI~. Repl'8ll6'ltIItIon.of the Inftow ...
.0Utft0w ItJdmgrapha
As the fi,.. step. a graphicIII ....nt8lian ofthe Inftow and outftow
~..W8II.. the.'existing condItiOnS" ~8houId
be prepared ulhownon Figure as. ·
(1)
(2)
Routing Table tor &le 3.1
(3) (4)
(5)
(8)
Time Step Time InftoW SlAt +0/2 Outftow SIDrage Stage
(a.) (cfs) (cfs) (af) (ft)
(hra) (mIn)
0 0 0 0 0 0 0.00 OD
1 0DZZ1 1A 8 4 0+ 0.01 OD+
2 Q.0463 2.7 28 22 0+ 0.04 0.0+
3 0D680 4.1 51 61 1 0.11 0.1
4 QD907 5.4 T7 123 3 0.23 0.2
5 0.1133 68 110 214 5 0.40 Q3
6 0.1380 &2 * 337 7 0.82 OS
7 0.1587 H 184 493 13 0.91 0.7
8 0.1813 1Q8 235 689 22 1.27 0.9
9 . Q.204O 12.2 282 925 34 1.70. 1.2
10 G.2267 13.6 317 1190 49 2.18 1.5
11 0.2493 15D 212 1446 64 2.65 1.8
12 0.2720 163 285 1661 77 3.04 2.0
13 0.2947 17.7 239 1836 88 3.36 2.1
14 Q3173 19..0 214 1975 96' 3.61 2.2
15 03400 . 20A 191 2081 102 3.80 2.3
16 Q3827 21.8 172 2161 107 3.95 2.4
17 Q3853 23.1 152 2216 110 4.05 2.4
18 0.4080 24.5 134 2249 112 4.11 2.5
19 0.43CJ7. 258 117 2263 113- 4.13 2.5
20 0.4533 Zl.2 102 2259 113 4.13 2.5
21 0.4760 ' 28.6 88 2242 112 4.10 2.4
22 0.4987 29.9 76 2213 110 4.04 2.4
23 D.S213 31.3 66 2174 108 3.97 2.3
24 D.544O 32.6 56 2127 105 3.89 2.3
2S o.s667 34.0 50 2076 102 3.79 2.3
26 0.5893 35.4 43 2020 98 3.69 2.2
*ZT - 0.6120 36.7 Sf 1962 95 3.59 2.1
28 D.6347 38.1 32 1901 91 3.48 2.1
Table 3.10
- . peak outflow
44
!/
APP
-
-
'ProcedU1'8 Used to Develop Tabte 3.10:
1. Columns (2) and (3) are obtained from the synthetic inflow
hydrograph (Table 3.5).
2. Column (4) is calculated as foItows:
(4) - previous (4) - previous (5) + (previous (3) + (3))/2.
For exarnpJe. 0 time step 15: 490 - 298 - 10 + 202.
a Column (5); outftow is obtained from the working curve (FIgUre 3.4)
for the comtSponding value of (SI ~ t + 0/2).
4. Column (6) is obtained by Interpolation between values on the
storage.discharge I'8lationship (Table 3.8) for the corresponchng
value of basin outflow in column (5).
,-
..-
3.3.3 Princlplll Outlet StructuntS
MultI-Frequency Outlets
Due to provisions within baCh the Pima County and City of Tucson
Floodplain ManagementOrdinances which I'8quire attenuation of the
2-, 10.., and 100-year peak flows, multi-frequency outlet structures may
be necessary in the design of many storrnwater detention facilities.
TheI'881'8 no standardized procedures for the design of an .'optimum"
multi-frequency outlet structure. The potential combinations of suitable
outlets for any particular basin are numerous, and limited only by the
cr&ativity and experience of the engineer. Figul'83.6 provides three ex-
amples of typical multi-frequency outlet structures, consisting of com-
binations of orifices, weirs, standpipes, culYerts, and spillways. The
minimum allowable pipe size for outlet structures is 12 inches in
diameter. HcwveYer, orifice plates with smaller openings may be attached
to funher reduce the flow capacity of a pipe. An ahemative to this type
of "compound" outlet structure is the proportional weir. The proportional
weir has the unique characteristic of a linear stage-discharge relation-
ship. Properly designed, this allows for an outlet structure that serves
to attenuate the entire range of peak discharges between the design
frequencies. In other words, with the proportional weir, not only can the
2-, 10-, and 1QO.year peak flows be attenuated to pre-development
values; but so can the entire range of flows between the 2- to 1QO.year
flood frequencies (e.g., 25-year, 5().year, etc.). Specific design criteria
for the proportional weir can be found in Sandvik 125] and French [22].
In all cases when mu1ti-frequency flood detention is required, reservoir
routing shall be performed for the 2-, 1~, and ':).yearfrequencyfloods,
at a minimum. The reservoir routing shall demonstrate that post-
deYelopment flood peaks for these three flow events are no greater than
pre-development flood peaks, as required by the applicable Floodplain
Management Ordinance of either Pima County or the City of Tucson.
Additionally, graphical representations of the inflow and outflow
hydrographs for the 2-, 10-, and 1QO.year flows shall be provided within
the hydrologiclhydraulic report.
c,~l
t)b~/
-
-
-
-
-
-
-
-
-
-
-
-
-
--
--
-
-
-
45
-
.s::.
~ g
~ n
'i.
:t 0 .s::.
Q. -
~ ! (f)
JB
~ S ~ :::I
C
~ 'i. i
-
C') :t
II .
E
0 i=
~ 0
....
CD
c
R
:=:
"
5.s::.
()~
Z~
!!'i.
an:z:
A
~-
~
InflowlOutflow Hydrograph
for Q100
Figure 3.5
~
:;r
.2-
CD
r
.s::.
u
(f)
C
t5 8 0 ~ t5 8 t5
an
('I') ('I') C\I - ..-
46
f.'
Typical Multi-frequency Outlet Structures
Figure 3.6
100Near W.S.
ground
.._m"'~_""'"_'""U"""'U"""'U"..."..."..""".."".".m_
hlii-bflV:':,g" Jtrlll,
\!u- rUl:::
1[
;:'-O'i
I
!
10~Year W.S.
v
=~
2~Year w.s.. 2--
weir ->
pipe 'ert
orifice 100.vear vapacity
Orifice - Weir - Pipe/CulvertConfigL 'ion
ground_
100-Year W.s. \] "/-~~.---t
10.Year W.S. ;, top of ~piii;~Y:":' ~~,
2S{ea"r""\V.S. - -~ =~
------....... -ut ~.-
~- \' ~- ~ l'
weir-
pipe/culvert
~
10..vear Capacity
I
'f" i
OrllCe
Orifice - Weir - Pipe/Culvert - Spillway Configuration
ProportionalWelr
47
~,
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-,
-
- "ftuh RIlcIca
Trash racks shall be pR)Yided for all pipe and orifice outlets which are
24 incheS or less in diam-~ and lor all grated outlet strUCtUres. 1iuh
racks shall be delignecl to be removable. and have a surface ... of
at I8ISt ten square feet. OpenIngIlnthe trMh rack shoUld not exceed
one-haIf the area of the outIIt pipe for mesh 1CI'Mn&. or one-third the
diarn8ter of the outtet tor bBr screens. The minimum opening shoUld
be no leIS than one inch. DesIgn of the trUh I'8Cklhould consider the
likelihood that unclogging may be.necessary whM the baIIn is filled
With W8t8r. AdditionIIIY.. concreIe pId is ~ eraund the por-
tion of the outtet strueture to be Ioc8t8d within the baSin in order to
facilitate maintenance of.the trIIh radL
EnMalon COntrol DownsbUIII of OutletS
AdeQuate erosion-COntlOl measures shall be pmvided doWNSbeam of
outlets tor deter1tiOn/r8t8 basinS. Such measures shOUld incor.
pond8 the criteria provided within "Drainage and CtwnnII D.lign Stan-
dards for Local Drainage:' as prepared by the PimaCounly Departrnert
of Transportation and Flood Control DiItriCt (52).
Local scour at culvert outlets. as well as long-term channel degrIda-
tion downStream of the basin. must be considered as an integral part
of the design of any stormW8I8r d8tentiOnINt8ntion facility. In the case
of on-line detention buins.. ciowIWbMm chanMI reaponse shill be
anaIyzecI assuming no sediment is being -supplied fIom upstream
reaches. In many instanceS, this wiD NIUIt in the need to either inIt8Il
grade-CC...t;o1 struetures at frequent inlerVIIs or to camplfJt8ly line chan-
nels With non-erodibIe material doWr18trMm 01 detention facilities. Pro-
t8Ction against IocaIICOUf 8ldetentiOn-bl*tOUll8l8 8haII be d.lign8d
in accordance WIth the crIt8ria pIOVIded In,...... ($2J for scour at
culvert outletS. This includes auch meuura as C&Jt.df.waIII. dumpId
rack, . and ... rocIHinecl b8Iins. .111 . CII8II. ........wIoCItieS of . flow at
clel8ntion-balin outlets ..... exiltingchannel ~ an energy
dilsipatDr shall be pn:Mdedto altow tIOwI to return totrXlltingcancl-
tions. to .. great an extent as poIiIbII. prior to exiting onID the
dcMnItnt8r:nproperty.
3.3A Embankments
It is ~ that, wh8n8\I8fpM.... dIt8ntion/nIt8n taciIIties
should be construeted wtth the atoragewlume located entirely beIOlN
the natUral graundeurtace adjacent to the balin.HoMMIr. in some in-
ItIInceS this may not be possible. and embInkmenIa maybe nIQtIS8rY
In order to provide the required storage volume. Since the .u. of em-
bankments may create a potential dcJwnItntam flood hazard due to
taifure of the embankment. the following design c:onsic:IerationS must
be addressec:l in conjunction with their uee;
48
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St8te Dalm SdIty Requl..........
The Arizona Department of WaIer Resources (ADWA). Division of Safety
of Dams. has legal juri8cl1ction CMr III dams (embankments) wtUch ex-
ceeds certain height and storage limtls. A "jurisdictional dam," as cje.
fined by ADWR, II ... . . etther 26 feet or montin height or stores more
than 50 acre filL If It is... thin Iix feet in height regardless of ItDrage
CIP8City or does not 8tDnt men than 15 acnHeet rvgardless of height.
It is not in jurisdiction." The ADWR should be contactec:l regarding
specific c:Jam.safety requintments In conjunction with the design of any
emb8nkment which might come under their jurisdiction.
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,......
Emergency Spillways
-
As the name Implies, emergency spillways are provided for the safe
overflow andb' bypaSs of incoming ftoodwaters should lItuations arise
that were not talc8n into account by normaf design assumptions. Such
situations may include the blockage of the primary outlet structure(s),
or the occurnJnC8 of a I1Drm event larger than that for which the basin
was designed.
Emergency spillway sections sh8Jlbe incorporated inlD the design of
any detentlonlnJtention basins which . employ embankments as a
mechanism for IDing fIoodwat8rs. The function of the emergency
spillWay shall be to ensurethatfloodw8ters which mightatherwise 0\181'-
1Dp the embankment will extt the detention besin and flow cIownstream
in the same manner and dintction as would have occurrec:l under pre-
clfMtlopment conditions.
The design of emergency spillways shall incorporate adequate 8tOSion
control and energy dissipating measures to ensurw the stability of the
embankment. The minimum design standard for emergency spillways
shall be the unattenuated 1()O.year peak c:fischarge. as detennined by
the Pima County or City of Tucson Flood Peak Procedures. for any em.
bankment which does not tall within the jurisdiction of the ADWR. em-
bankments which do fall within the jurisdiction of the ADWR shall c0m-
ply with the appIicableADWR design requirements.
Seepage Ttuaugh Embankments
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The ftowof water through a pervious foundation produces seepage
forces as a ntault of the friction between the percolating water aOO the
soil medium. As the water percolates upward at the toe of the embank-
ment. the seepage forces lift the soil by reducing its effective weight. In
certain cases. this "piping" of th.efounclation soil can result in the failure
of the embankment. Since this process occurs over an extended period
of time. it will generally not be a problem with detention basins that drain
within a few hours. However, detentionlretentiontaciUties that are de-
signed tor recreation andlorwater re-use purposes. and therefore store
water behind an embankment for an extended.time. shall be analyzed
forpotential seepage problems. The analysis shall include an appropriate
soils irMstigation.lh c:cqunctiot1 with ftow.net or other sultableseepag.
analysis techniques. If the analysis indicates that potentially harmful
..i
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...page through or undemelllh an embankment II paI8IbIe. then ~
pIic8bIe methOdS of...page contIOI8h8l1 be lncOrpOIated In the design.
MethodS which hIM been suooeelfully &.-clio teduo8..I.page include
slurry trenches. 8heetPiltng, end CDIlCi. culoOff walls. .
An additional considenItiOn is the s..page of retained runoff Into lOlls
having Ihrinkl8Welt charact8ri1tiCs. and...page .. coIlapItble soils.
"atructures are to be toaded..~acent to ...ntion bUinI,.th8n ap-
propriate geotechnical inv8ltlgatiOns IhouId be undertalc8n which lid-
d.... these tlemI.
3.3.1 Law-FIoW. ChM.....
LDw-tlow channels and IIoped bIIin ftoonslhould be incorpo"'" in the
design of aI'''dry'' detentiOn b8Iins in order 10 prevent any pending of
nUisance water. LDw-ftow channets should be deSigned with. minimum
longitudinal slope of o.oos fHtIfoot, and should be designed with .
capacttytD convey the ~opmInt2.,..,.tIood peak. If practical.
Concr8te-lined IcJw.ftow ctl8nne1l may be designed with . minimum
Iongltuc:llnallllope of QOQ2 feItIIaoL The baSin floor ahBJl.be graded to
drain either. toward the kM-ftow channel or the outlet. atruCtUnt. The
minimum floor IIope IhaII ~ o.oos feet/foot.
3.4 Sedimentation Impacts
3.4.1 Esttmatlng SedIment DelIwIy
Deposition of 8ICIirl\8l'1t is an unavoidable conMqUInC8 aaociatld with
the construclion of detention blains on natur8I waaen:ourses wtthin Pima
County and. to a somewhat....r degree. the City of lUcson. In order
to mitigate the effects of 8ICIimellt8tion. detention basins must be de-
signed in a manner that incorporates additional stcnge wlume which
will allow tor a certain amount of sediment build up. Additionally. an in-
spection and maintenance schedute should be implementecl to
periodically monitor 88dirnentation within the detention basin, and to
remove excess sediment as neoISl81'Y.
The addltional storage volume which is to be incorporated in the design
of "OrMine" detention facilities (888 definition of "on-line" detention in
Section s.-Chapter 1). shall be d8t1mninedflam Equalion 3& This wlurne
is approximately equal to ten times the average.annual88diment yield
from watersheds within Pima County and the Ctty of Tucson, and roughly
ontHIaIf to two-thlrds the sediment transpOrt expected during a 1QO.year
flow ewnt.
50
./.J
po.F~
-
-
I \So. SOOACp I
Equation 3.8
Where;
--
\SD - additional detention/retention-basin volume required for
sedimentation within an ~'on-line" facUlty, in cubic feet;
A - drainage 8188 contrIbuIing 10 d818ntionh8tention basin. inacntS.
and;
Cp - tractionaJ portion of the dJainage .. which win be contributing
eedlmenl AreU which will not contribute eediment include all 1m-
pervious antaS, sodded areas, and ather areas which hIM surface
treatments that prevent soil loss.
The additional stoJage volume which is to be incorporated In the design
of ''Dff.Iine'' detention facilities (again, see definition in Section 5. Chapter
1) shall be 76 percent of VSD, as determined from Equation 3.8.
,-
""'"
U.2 Methoda tor Control of Sedimentation
,~
Sedimentation impacts upon detentionlr8tention facilities shall be c0n-
trolled through a periodic blSP8Ctiun and maintenance achedule.ln order
10 facilitate future maintenance, pennanent concrete markers shall be
installed at the IeY8I of the basin floor in order to define the limits forsedf.
ment Rtmoval. Additionally, graduated posts shall be Installed at each
concrete marker to a height necessary for adequate delineation of the
upper level of sediment build-up, which corresponds to the acldttional
w1urne (i.e., VSO> provided by Equation 3.8. At a minimum, sediment
buitd-up shall be inSpected on an annual basis, and shall also be in-
spected after any major inflow to the basin. Excess sediment shall be
rerncwec:l from the basin at such a time that one-half of V SO has ac-
cumulated. This level of sediment build-up shall be clearly marked on
the graduated posts installed within the basin. All sediment remcMKf from
the detentionlnltentlon basins shalf be disposed of either at an authorized
sanilarylanctftU or at any other suitable location approved by Pima County
or the City of Tucson.
Sediment removal within a detention basin may be faclfltated by the use
of a "sediment trap" at the basin inlet, which will concentrate the ma-
jority of incoming bed load within a small portion of the facility. Sediment
traps should be provided in conjunction with all detention basins which
are intended as multi-usfJ facilities. A conceptual sketch of a typical
detention-basin sediment trap is.provided on Figure 3.7. Following is a
list of guidelines for the design of efficient sediment traps.
1. The additional sedimentation volume V SO, as determined from
Equation 38. should be provided within the sediment trap at an
elevation below the inven of the inflow channel.
-
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-
/)L;a 7
-
-
-
-
-
-
-
-
-
-
-
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-
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51
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.
I
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. -
. .'
.
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,
Note: .k ~ 2 .
.
W
. . ",
,
.
L Detention Basin
." . '. . .
.
.
-',
Plan
Section
,
Sediment
Build-Up
"~
CUi! For Drainage of Sediment Trap
Invert ~
Sediment Trap Concept
- Figure 3.7
52
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r-
Ro8dWly Embankment Storage.
When feasible, use of roadway fill slopes as an embankment for a deten-
tion basin provides an 8OOIlOmical means of SlDrmwater storage. Special
considerations must be given both 10 the stability of the embankment
and to the protection of the embankment from erosion. Additionally. State
of Arizona damosaf8ty requirements may need 10 be addressed if the em-
bankment height and/or the potential storage volume exceeds certain
limits (see Section 33.4).
RegIonal Detention Batns.
Forthe purposes of this manual, regional detention basins reterlO storm-
water storage facilities which intercept the ftow from an upstream water-
.shed that has a drainage area greater than one square mile. Design of
such facilities Within Pima County ancUorthe CIty of Tucson is intended
-
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-
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53
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,;
~~>-9
tDbe.... canj&.I1Cticn with the implementation of buin management plans
prepared by, or under the direction of.. the Pima County Flood Control
DistriCt orthe City of Tucson Engineering Division. In general, the criteria
and methods presented within this manual are not applicable 10 the
enalysis and design of ntgional detention tNlSins.
Listed below are certain criteria which will appty10the deSign ofaurface
seoragedelentianlreten facilitiesthat are pIemed 10 beloc8l8dwtlhin
elther'the City of Tucson or Pima County:
1. Grading of any surface storage f8cIIlty shall compty with the ....
quintmenllspeclfiec:t wIttin Ch1p18r11 .xl 4 of this manual.
2. Sedlmenllllian within dll.nIicmII_ntion bII8ins ah8II be ilaspect8d
and controlled, as specified within SectiOn 3.4 of this manual.
3. Maximum disposal times of ItDrnMIdIr runoff far dltentianlreten-
tion basins shall be 8S foUows:
8. 12 hours for detention/ntten facilities which intercept
runoff from an upstream watershed .re. which is up 10 ten
acres in size.
b. 24 hours tor d8tentianlretlmtion facilities which intercept
runoff from an upstream WIIbtrIhed area that is greater than
ten acres in size.
4. Detention basins which do not inco..,oe-1tDrnMater retention
must provide positive drainage from all points within the basin 10
the outlet structure. If .... of standing water dewlap over time,
ntgJ'Bding of the basin wili be requi..-d 10 insure pasitivedrainage.
5. A soils report shall. be required in conjunctian with the design of
eachsur1ace storage facility which utiliz8s infiIbdo.1 asa method
of basin drainage. The report shall, 8S . minimum, address soil
classification, soil erodibility, soil permeability, slope stability, and
ground-water elevations.
6. Outlet structures for detention facilities shall be constructed,
whenever possible, such that they ere phyliclllly opposite inlet
1trUCtUres. .
7. No .'on-line" detention facilities shall be permitted If any portion
of the wash is in a natural state upsIrMm of the proposed basin,
or If the upsb'8Bm watershed is greater than 100 acres. unlessap-
~ is first granted by Pima County or the CIty of 1Ucson.
8. Grated outlet structures shall not be CMl'designed 10 account for
debits blockage and clogging. Rathe~ . debrislCnt8n or trash rack
shall be designed 10 pnwent blockage of anyoullet structure which
incorporates grates.
54
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9. The Pima Cou~or City of Tucson Parks and Recreation Depart-
ment ahc"ld be contacted regarding the detention or retention of
runoff Wft,"'M) any public......
10. Finlshed-floorelev8tiona of ItruCtures shall be a minimum of one
foot abov8 the 1QO.year waIer-surface elevation of any adjacent
det8ntio' -"8I8ntion basin.
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3.5.2 Partdng Lot Sto....
A special cue of surface storage Is the use of parking IoIs for de. ".
tioM8t8ntion. The use of parking IoIs is an economical optlonb'meeting
detentionlr8tention nlquirements 1" lligh-density commercial and in-
t<. ..1riaJ deveJopments. Planning c:... within a parking lot which will
8,.. .APtpandlngahoukf be such Itv:"adestrians are inconvenienced as
little as posaible. Deeper antas lhoukl be confined 11) remote areas of
perking IoIs, whenever possible. The maximum depth of ponded water
within any parking tot location shall be one (1) foot. Drainage of parking
lalscan be accomplished by means of dry wells (if permitted), curb open-
ings, weirs, storm drains, orifices in walls, gated outlets, etc.
The minimum Iongituclinal stope permitted within parking-lot storage
facJIJties is o.oos. unJess concntte valley gutters ant provided. With con-
~ valley gutters. a minimum longItudinalalope of 0.002 may be
ptmtted.
a.u Rooftop StoNge
.1""--
The use of rooftops as storage areas for runoff is not an acceptable
~ of meeting the detentionIr8ten criteria of etther Pima County
or the City of Tucson.
3.5A UnderglOund Storage
This type of ~ involws the construction of underground tanks,
pipes, or vauIIs which accept stormwater ruAOff by means of storm-drain
pipes and catch basins. Due to the high cost of of this type of installa-
tion, it is generally limited to high-denaity developments, where surface
storage is not feasible due to either the scarcity or high cost of land, or
~. '
,,;-
Underground 8IDrage facUities must be provided with some method of
drainage (e.g.. gravity drains, pumps. or infiltration). In all cases, man-
hoJes (or some other means of access to the underground storage
facilities) must be provided for maintenance purposes.
3..i...5 Subsurface Dillpoul
Methods for .underground disposal of stonnwater runotfwhich have been
successfully used throughout the country include slotted drains, infiltra-
tion trenches, and engineered basin floors. The analysis and design of
these methods is well documented WIthin a Federal Highway Administra-
tion publication entitled Underground D..., ofStormw8ter Runoff
..j
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(57). This publication Is available fi'om the offices of bOth the City and
County Engineer and from the University of ArizOna library. The engineer
engaged in the deSign of such facHIties Is Nferred to this publication for
specific deSign criteria. A conceptual sketCh of a typical-engineered-
b8Sin-ftoorlnstallatiOn Is provided on Fig,,", 3.8
Due to the generally deep groundwater levels and permeability of s~
surtac:ie strata within the S81TiHu'id southweSt. the most common method
of subosurface disposal of atormWater. hislDrtCally, hIlS been by the use
of dry wells. Figure 3.9 provideS an example of a typical dry-well
in.talaation.
Conceptual Cross Section
Engineered Basin Floor
Figure 3.8
The following list of requirements and criteria shall be utilized in the
design and construction of dry wells (or other methOds of subsur1ace
disposal of stormW8t8r). The ntader is also referr8d to current dry-weIl
policies adopted by bath Pima County and the CIty of Tucson.
1. The infiltration sur1ace of the subsurface disposal facility must be
Iocat8cI a spec;1fied minimum distance from the 811dicgnxJndwater
table, both horizontally and vertically, depending on the type of
development proposed. The Pima County FloOd Control District
or the City of Tucson Engtneenng Division ahoutd be contacted
for specific criteria regarding this Item.
2. The design of dry wells must include provisions for trapping sedi-
ment within a settling chamber. This measure will significantly in-
crease bOth the efficiency and &88fullife of the well. Once a year,
at a minimum, the setdlng chamber ahaII be inspect8d, and it shall
also be inspected after any inajor infloW to the dry wet!. Sediment
shall be removed from the chamber at such a time that approx-
irruHIy one-haIf of Its capacity is filled. This IlNeI of 88diment builcl-
up shall be clearly marked on the inside of the settling chamber.
All sediment removed from a settling chamber shall be disposed
of either at an authorized sanitary landfill or at any other suitable
location approved by Pima County or the City of lUcson.
3. A test well shall be installed for any retention facility utilizing dry
wells for stormwater disposal. This test well may then be utilized
as one of the functioning dry wells within the retention faciiity. For
56
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~t
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Cast Iron Ring and Grate
Debris Screen
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Settling Chamber -
......... Asbestos Cone. Overflow Pipe -
- Precast Cone. Liner
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Fiber Membrane
~ ~- '-- -
,..:.;..
r'
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PVC Pipe
....
Gravel Drainfill
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Injection Screen
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Typical Dry Well Installation
Figure 3.9
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Counesy of McGuckin Drilling. Ine.
Phoenix. and Tucson. Arizona
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57
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3.6 Basin Design Requirements
Requirements regarding basin side slopes. depths, security barriers. and UI8
of multiple basins are provided below. These requirements are reiterated and
expanded upon in Chapter 4, Section 4.3.1, where they are giwn in conjunc-
tion with guidelines tor pian-WM' baSin shipes. design of muttip6e baSins, beIin
screening, and design of inlet and outlet struCtureS. Refer to Section 4.3.1 for
illustrations exemplifying these requirements.
-
3.6.1 autn Stde-Slopes and Depths
Varying side-Slope sjradients shall be provided for baSins one acre and
larger. Smooth transitions must be provided betWHn grades. and the
recommended horizontal distance for each slope gradient shoUld vary
by at least two teet (example: 3:1, 5:1, 7:1). Continuous uniform slopes
shall not exceed 20% of the basin perimeter.
In basins containing human-activity zones. access slopes of 8:1 or flat-
ter must be coordinated with these zone&. There shall be a maximum
of 100 feet either to the base of an access slope or to a 4:1 basin
side-Slope.
Transitions from slopes to level ground at the top and bottOm of basins
shall be smooth curves.
58
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The followinglopeldepth ratios are required for muJti..use basins:
1) A maximum of 2:1. for protected skIe-sIopes and 3:1 for un-
pratected .1Iopes. 'where depths are tess than three feet;
2) A maximum of 4:1, where depths 818 equal to or greater than three
feet.
....'-
A benched configuration is required for basins In excess of six feet deep.
Benches within basins shall be proportioned so the bench width is at
least three times the height 01 the slope above it, m8asUf'l'k',", from the
lowest point on the top of the slope above th bench. T, ."inimum
width 01 a bench shall be six feet.
-.........,
The maximum depth to first bench, or basin floor. shall conform to the
previous stope depth ratios.
All detention basin floors must be graded to drain.
3.6.2 Security Barrie..
Basins designed in accordance with the requirements contained in this
manuaJ should prelude the need tIr fencing, such 8S chairHink. However,
in the following instances security barriers are required. These ~>4rriers
may consist 01 vegetation, masonry, wood, or chaln-link. ~lOn, or
a combination of vegetation and structural materials, is prefenecl.
Security barriers must be provided at the top of all basin sJopes steepe'
than 4:1, where water depths 8JlC88d two feet.
Vegetative barriers must be of a width equal to or greater than overall
height, with density sufficient to restrict access. If vegetative screening
is to be used, plant materials must be in place and estabIlshecl at the
time the OCQ iplncy permit is requested.
A minimum 42-inch barrier height is required for aU basins.
Detail sections of proposed fences, if required, are to be shown on pav-
ing and grading plans or cieYetopment plans, as appropriate.
Local, private-basin fences must be 42 inches, or higher, on any side of
basin where buUdings or ather restrictive structures are within five feet
of the basin, and have no points of exit or entry into the basin area
Fencing, if required, shall not restrict the hydraulic capacity of structures.
Railings must be provided, as required by the Uniform Building Code,
for retaining walls on any inlet and outlet structure headwalls and
wingwalls.
Signs must be provided to inform the public of the basin purpose, and
the potential safety hazan:I from stormwater detentionhetention.
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3.6.3 Multiple 88Itns
Where the singIe-bUtn depth required exceeds ten feet, or where the
baSin volUme exceeds 50 .,... multiple baIinS.1h8I be used or
guidelines from the manual entitled "GuidelineS for the Development of
Regional Multiple-Use DetentionJR-ntion Buins In Pima County.
AriZOn~" shall be employ8d.
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60
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...
~
i"'';'=
,Multiple Use Concepts and
Aesthetic 'Design Guidelines
....
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. '...
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~I>"ol
. IV. Multiple-Use Concepts and Aesthetic
Design Guidelines
This chapter addres8eS aesthetic considerations of det8ntion/n1tention basin
deSign prtmarilywtth regard to multiplHlSe concepts. grading. and 1andscap-
ing. The goal of all detentionJretention baSins is to be multi-use. regardless
of 8iza Multiple-use aIt8m8IiveS are pnJ88n18d. as well as guidelines for baSin
siting and surface treatments; Requirements previously listed in Section 3.6
regarding b8Iin grading. we of multiple b8sins, and I8CUI'ity barrierS are also
expanded upon and IUustrated in this chapter.
4.1 Basin Siting
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--
~-
l.Dc8tion crt ....ntionIdetention basins can influence effectMmesS In controlling
IlOI'mWIIt8r. potential for use by surrounding residen1S. and perception of the
site as an amenity.
Guidelines for siting are presented here for the most commonlyobseMKI and
recommended basin locations. These inciude, but are not limited to:
project Scale Sites
Individual parceis (commercial and industrial sites only)
Roadside loCations
4.1.1. Project Scale Sites
-~"'."'-
Where indMduallot retention is not feasible or desired, a common faciflty
may be provided to detain or retain runoff from.1he project. This scale
d b88in may be employed at industrial or office paries, mult....mily hous-
ing complexes, or within single family neighborhoods.
In a residential setting, a project-scale bas;n provides more than a visual
amenity. A centralized location may encourage active use of the basin
area for recreation or relaxation.
-.-
_c"*'"
.
Guidelines: Basin Siting in Residential Projects
Locate basin in a centralized area for easy access and visibility.
..-.....,
--
.--
~
61
.........
~.f)~/.
Provide open space links from basin to any exi8til1g or planned
open space system. These can be pedestrian or bike paths. or buf-
fer areas between different land uses.
Coordinate basin site with other on-site recreation facilities.
Coordinate basin site with community open space and recreation
facilities (schools, churches, or parks).
4.1.2. Individua' Parcels
Retention of stormwater runoff on individual lots may occur on industrial
or commercial sites. This manual does net apply to single-family residen-
tial lots. Larger scale sites have the option of combining basins with park_
ing areas, peripheral landscaped areas. buffer strips. street frontage, or
with open space between and around buildings. On smaller parcels.
basins are-more likely to be integrated with landscaped areas only. Lot
shape and size, land use, and required stormwater volumes for reten-
tion/detention purposes all play important roles in siting basins, and in
their size. Comply with all applicable ordinances. regulations and design
policies when siting retentionldetention basins.
62
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....
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.........
...".,.
-....
-
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--
. ... . ...
. .
..... '.
Guldel.....: Basin SIting an Individual Parcels
Locate basins in landscaped areas where possible. The ap-
prapriat8 nMewingagency (Pima Cot.ny f1 City of Tucson) should
be consutted rwgarding restrictiOnS on use of dryweIIs10r retention
purposes in landscaped areas.
1I
Respond to basin vieWs from adjacent streets and major vantage
points.
tD1
.
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arJ
Wl=
=
a!la=
=,~-.-..
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tIll
If retention storage on pavement is unavoidable. locate in less tr.
quently used areas.
~
63
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Site basin to encourage mUltiple uae.
4.1.3. Regional Facnltl..
In an urbanlsuburban context, several developers may collaborate to'
construct a common basin to seM more than one project. At this scale,
connection to community recnNltion or open space systems Is impor.
tanto Oftentimes, facilities of this size can create an open space system,
or be the catalyst. in planning for one. Refer.to "Guidelines for the
Dewtlopment of Regional Multiple-Use DententlonlRetention Bains in
Pima County, Arizona" (76] for information regarding such basins.
Guidelines: Siting Regional Basins
Include comprehensive assessments of environmental impacts
(wgetation, wildlife. hydrology, Yiewsheds) in the siting process.
Larger numbers and varieties of people may be affected by site
selection and multiplfHJse opportunities; research and planning
efforts should reflect this.
4.1.4. Roadside BaIns
Retention basins located along roadways can function as a buffer or
screen between neighborhOods and mBjorstreets, and create an attrac.
tive entry space for a new development project. Comply with all ap.
plicable right-of-way, traffic safety, and landscape ordinance re-
quirements and policies when siting roadside basins.
64
-
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--
4.2 Multiple-Use Concepts
Specific multi-uH 8It8m8tives for a retenti0n/det8ntion baSin should be ap-
propriate for the size and configunJlion of the baSin, and I'8IIt8to surrounding
land use. Appropriate uses Include:
project Amenity
Active Recreation
Passive Recrution
Urban Open Space
Preservation and enhancement of native plant communities
water harvesting for recharge and ..use
WUdllte Habitat
~--
---.."",,-.
U.1. Project Amenity
'-""--
In its simplest form, retention or detention baSins should be much more
than an engineering facility designed to control stormWBter. The ability
of a basin to function as a visual amenity or focal point should not be
overtookBd. As a landscaped space. there are many attractive solutions
acceptBbIe underthe guidelines set forth in this manual. The basin space
can promote f8e1ingsof lower density deveJopment, add topographic in-
terest to flat terrain. and function as a node or tocaI point within a c0m-
munity, especially if it is aandscaped as an 088isin otherwise desert
environs.
-"-
4.2.2. Acthre Recreation
Active recreation invoIws both structured and unstructured actMties re-
quiring physical activity. Active recreation often requires larger basins.
These may include:
--
Jogging
Walking
Bicycling
Playground Activities
Fitness Training
Equestrian Activities
Skate Boarding
Roller Skating
Field Sports
Court Sports
Lawn Sports
Horseshoes
Archery
Golf
Balloon Launching
--
These activities have specific spatial, orientation, or equipment. needs.
Site furnishings and recreational equipment may be located in or out-
side of the flood zone.
--
65
........-
.t}'
tOP;7 2-
--
-
Guidelines: Active Recreation
Provide adequate space, orientation, and groundplanetreatments
for each destr8CI use.
--
. JI night use is desired, light poles should have wire connections
(and hand-hotes) located above the high water mark.
--
)1111\\\ \ ll""-t u.
--..
1il6t-t ~TEfZ
LlUE 1
__.Y- __
~-
-~
-
,,\.. ,...h.~ ,
...
Assure positive drainage for pawdsurfaces in thefloocl zone (refer
Chapters II and III of this manual for minimum slope require-
ments), or
_.
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p~rn~
D9lA.ItJ,Ab:~ r
-
_...
A,.
Use porous pavements, where permitted, in the flood zone.
-.
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----..
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--...-
66
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I I
use concrete and coated metal products within the flood zone.
Avoid the use of wood.
Use vegetation to separate activity areas and provide shade.
-~
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4.2.3. Paulve Recntation
,--.....
Passive recreational use Is typically oriented to small groups and In-
dividual users. This multklse concept does not always require special
. facilities. nor large areas of space. Site design should delineate spaces
and provide furnishings or conveniences for users in a relaxed mode.
Passive recreational uses include:
-,..~
VIeWing
SittinglRelaxing
Reading
Writing or Sketching
Talking
Sunbathing
Board or Card Games
People Watching
Concert Going
Napping
Picnicking
Nature Study
Star Gazing
-~
Guidelines: Passive Recreation
Provide a variety of places, structures orfumishings for people to
sit.
...-'.......
...
--
...,.~-
01
-..
:1
~bfl~
Select an sfte furnishings forthelrmlerancetD inundation or locate
outside of inundated areas.
Locate site fumishings for individuat privacy and for small groups.
Use vegetation to shade sitting IU'88S and separate spaces.
-~~~.J(
68
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4.2A. UrbIIn Open Space
The opportunity to use basin sites primarily as open space is strongly
urged. Open space within urbanized areas of Pima County is bec0m-
ing more valuable as growth continues. Open apace provides
psychological ntlieffrom man-made environments and provides p0ten-
tial for cityodWellers to enjoy the out-of.doors. YegetIdIon also helps filter
noxious materials from the air.
Guidelines: Urban Open Space
Provide a variety of visUal sequences from both within and outside
the basin.
Emphasize the role of plant materials pnMde ~ contrasting
forms and texbnS.
Provide access to the site from a variety of points.
69
/i
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--
--
Site butn where It is highly visible and can be enjoyed and used
by residents.
-.-
. .
--
.....--
_.
4.2.5. Preservation of Native Plant Communities
A
1Ucsonts..nse of regionalism is often threatened by new development
reptacing the native landscape with imponad r.-"erials and ecotic plan-
brIgs. Preservation of native plant commun s and 1DpographicaJ
featur8S maintains the distinctMt character of t ':J Sonoran Desert. This
is especially appropriate aJong scenic routes. or majorthoroughfar8s and
business areas. Additional benefits include Its wildlife habitat value, low
water-use requirements, and lower deveIopmem_ This concept in-
cludes both preserved and re-established naturalerwironm8nts.1t is ap-
propriate at any scale, and may be combined with other uses.
Gul6""'I188: Preservation of Native Plant Commun ..
.....
-
.....
Preserve existing plants and landforms whenever possible.
Minimize disturbance of the area during construction.
If revegetating, use existing species at existing. densities.
-
- -
Transplant riparian trees and/or exceptional specimens tD new 1oca-
tions 'hey cannot be preserved.
......
Provide wel!-defined pedestrian paths through the site.
Provide ed~ional information about the site in the form of
signage or pamPhlets. where appropriate. 4u . Q ~
4
--
-- -
-
...
---.
70
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p,r;? '1
4.2.6. Water Harwatmg for Recharge and Ae-u18
A buiC water haMllting system consiStS ofttvee components:. collec-
tion. ItOnIge. end disper8ion. Since stDrmwater ret8ntionI detention
bliinswill aIr8adY be deSigned tocoll8ct and 8101'8 runoff. some sim-
ple IIdditianS may allow h8N88Iin9 the water tor re-u-
Water may be strmJd in baSins deSigned specifically to augment the
groundwBt8rauppty at their locations. TheH baSins should be sited ac-
cording tD the guidelines in Chapters 1\ and III of this manual. No formal
dispersion is required other than methods to maximize the potential tor
water to percoIat8 through the soft and reach the water table. Pima Co~
ty Health Department requirements must be met in addition to the nor-
mal revieW reQuintmentS.
Guldell....: Water Harvesting for Recharge
Site and basin design should allow tor maximum surface area c0n-
taCt betWeen stored water and the ground.
At. detention basins. use berms perpendicular to direction offlow
to sIDw water and increase contact with soil surface. Minimize sedi-
ment accumulation by providing a settling baSin at the basin inlet.
,...."'-
Where water is stored tor re-use, infiltration is usually prevented, and
either passive or active methods of dispersion are provided. Runoff may
be utiliz8d en-route to the storage basin, while it is in the basin, or dispers-
ed to off-site locations. Uses include irrigation, recreation and augmen-
ting industrial or ~1'mercialwat8r supplies. Comply with all public health
regulations regarding the use of stored runoff.
Runoff water stored tor recharge or reuse purposes does nat meet reten-
tion requirements. AdeQuate basin storage for retention must be provided
at all times in addition to the volume provided for harvested water.
71
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-- ._,----~_._.~ ....---.---.------. .
---.---------. ----
-
,.......""-,"""'...__......-..._"'...~,,.~'-'".._"'.._._~~~_.._.---
Guidelines: Water Harwstlng for R.U..
-;"
...
1i'eat soils to increase impermeability with paraffin, sodium
chloride, clay, or..- an in'IpernabIe membrane he Contact Tug.
8Cm Water and the PIma County HealthDepertmentnlglUding the
. acceptability of these m8l8rials In terms of their eftect on water
,quality.
",. .'
--
. Site grading should dir8ct the runoff to the 8IDrage f8cIllty.
..A._
....
"
Site grading may direct Nnoff to landscaped areas for direct use
prior to collection in a basin.
Underground storage may be used.
4.2.7. Wildlife Habitat
-
- -
.....
-
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~ v--..... ....
-
-
A._
The three basic requirements for wildlife habitat are food. cover and
water. P.roviding these requirements will attract wildlife. Food plants in-
clude grasses and forbs for grazing animals, browse plants such as mes-
quite. saltbuSh and hopbush.and plants which produce fruits or seeds,
such as hackberry. Iycium, and jojoba. CoYer provides shelter and hiding
places for wildlife. and can be provided by placing dense plantings WN8y
from heavily used areas.
72
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Guldenn.: Providing Witdlife Habitat
Site basins away from busy roads or noise-producing activitieS.
c__
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Unk basin revegetation to heavily vegetated areas off site and
densely-vegetated corridOrs or drainage channels and washes.
..,"'''''''---
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Use predominantly native ptantswith diY8f'Sityin species, size and
form. Groundcovers. especially range grasses and forbs. provide
good grazing. Avoid monocultures of tall trees or grasses - strive
for a multHayered eflect.
--
~:....
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,....,..-
73
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Contro! human use of the site by clearly defining trails.
Provide opportunities for people to Yiewwildlife In.... least IiIeIy
to disturb them.
4.3 Technical Requirements and Guidelines
4.3.1. Buln Conflgunatton
Shape, slope, depth, benching and multlple-bastn configurations are
the principal considerations of retentionIdetention basin grading for
visual quality. Acceptable grading solutions should reftect the same c0n-
cerns for proportion and aesthetics as with decorative landfonn. Con-
textural factors that influence basin grading and configuration are:
Required floodwater volumes and engineering design
Surrounding land use
Site land use
Surrounding topography
Unique site features or vegetation to be preseMld
74
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-
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.....
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-
--
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.... ~
-
..
....
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....-
-
Availability and cost of additional land, if needed
Intended surface treatments
Points of access
Visibility
Desired visual character
Access for regular maintenance-including landscaping,
recreation facilities, floodwater control structures
Safety concerns
Project budget-including construction and long-term maintenance
Basin Shape
Basin shapes tend to be related to the size and shape of parcel of land
dedicated for storm water retention or detention, the desired visual
character of the end product-naturalistic or geometric-and the func.
tion of the basin, whether only for flood control or multi-use purposes.
Guidelines: Basin Shape
Where possible, dedicate an irregular tract of land for use as a
basin site. Use open space areas between building groups and
at project edges.
Vary the shape and side slopes of the basin and maximize the
linear footage of perimeter.
75
008d--.
-
-
GUlvilinear shapes are preferable to geometric ones. If rectilinear
or geometric slopes are used, soften the contours with minimum
10-foot radius curves.
-
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76
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0083
Combinations of geometric and curvilinear shapes are acceptable.
Basin Side Slopes
Variation in basin side slopes adds visual interest and enhances the
edge quality of the basin. If side slopes are too flat, basin volume is
reduced and visual quality is lessened. If too steep, erosion may occur
and maintenance may be difficult, in addition to potential safety hazards.
Slope grading should achieve a balance between engineering functions,
multi-use factors, and visual attractiveness.
.-
Slope requirements are expressed as a ratio of horizontal to vertical
distance.
Requirements: Basin Side Slopes
For basins one acre and larger, use varying side-slope gradients.
The recommended minimum horizontal distance for each slope
gradient used should vary by at least two feet: example 3:1/5:117:1.
Provide smooth transitions between grades.
~..
In basins containing human activity zones, access slopes of 8:1
or flatter must be coordinated with these zones for easy exit dur-
ing flooding. There shall be a maximum of 100 feet either to the
base of an access slope or to a 4:1 basin side slope.
"'-
,-
n
0081-
-
-
Continuous uniform slopes shall not exceed 20 percent of the
basin perimeter.
-
Transitions from slopes to level ground at top and bottom of basins
shall be smooth curves.
Vertical depth to be measured from top of slope at lowest point
on basin rim to toe of slope at lowest point in basin.
-
Multi-use basins shall be required to conform to the following
slope-to-depth ratios.
-
-
Less than 3 feet deep:
Maximum 2:1 for protected side slopes and
3:1 for unprotected side slopes.
-
-
-
-
-
3 feet deep and greater:
Maximum 4:1
-
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78
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GutcIeIl...:
Curvilinear cOntOUrS at areas Immediately adjacent to walls or
structures are encouraged.
", .
StructuntS such as retaining walls are acceptable for up to 35%
of basin perimeter. Refer to the latest edition of the Uniform
Building Code tor fencing requirementS adjacent to building
structures.
Sam Depth
The depth of retention basins affects the desired visual character, the
perceived scale of the facillty, safety when stormwater is retained, and
vi8lbUltyinto the basin for supervision.
Requnmenta: Basin Depth
A benched configuration will be required for basins in excess of
six teet deep.
Benches within basins shall be proportioned so the bench width
is at least three times the height of the slope above it, measured
from the lowest point on the top of the slope above the bench. The
minimum bench width shall be 6 teet.
79
/JtJ!'Y
--
--
Maximum depth 10 first bench or basin bottom shall conform to
the 8Iope-depthratio of the pnMous section. .
In larger basins greater than one acre In size. avoid one consis-
tent depth where possible unless required far playing fields. Use
.earth berms to provide topographic interest or islands above the
flood level.
--~
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.-.
,..." C> , t::>
_. -
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Multiple Baatns
-
A series of basins is useful on sites with excessive stormwater volumes
or al8rge land area available ior retention or detention. Multiple basins
can reduce the perceived scale of the facHlty.
-
-
Requirements: Multiple Basins
Where the singte.basin depth required exceeds 10 feet or where
the basin volume exceeds 50 ac....feet. multiple basins shall be
used or guidelines from the manual entitled "Guidelines ior the
Development of Regional Multip.Use Retention/Detention
Basins in Pima County, Arizona" [761. shall be employed.
...
-.-
80
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~f.5
-
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Guidelines:
Arrangement and grading of multiple baSin facilities shoUld reftect
and enhance local topography. Refer to state dam requirements
if appropriate.
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Gntater perimeter allows for more screening, wildlife cover, visual
Interest, and shading in use areas outside of the basins.
If l8Cr88tional use is planned tor the site, locate facilities in higher
areas of the basin to avoid frequent inundation.
..-'
,....J"~'_
Security Barriers
Because retentionldetention basins are designed to hold water tor short
periods of time, safety precautionS must be taken to protect the public.
The requirementS and guidelines in this manual were deYeloped, in part,
to preclude any need for fencing, such as chain link, around reten.
tionIdetentlon basins. Some instances may however, require placement
of security barriers. Security barriers may be constructed of vegetation,
masonry, wood or chain link. vegetation, or. combination of wgeta-
tion and structural materials, is preferred.
81
--
f~"
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---
--
Fencing at intet and outlet structures, If requirecl. shall not restrict the
hydraulic capacity of the structures. Fencing detaUs should be shown
on the . Improvement plans or clewlopment plan, where appropriate.
Requirements for Security Bllnie..
--
--.----
~curity barriers must. be provided at the top of all basin side
slopes steeper than 4:1 where watar depths exceed 2 feet.
--~.
Vegetative barriers must be of a width a... Jal to or greater than
~i ''111 height. Density must be sufficient "" i'8Strict 8CCCleSS Plant
IE. ..1IOn must De consistent with the Pima County 1.anclscape
Ordinance.
....,
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'/e6e1',60.1'bW &~ rs-12-
A minimum 42-inch barrieI' height is required for all basins.
-.
-
-
42.1 - .
Inn.
--
Detail sections of proposed fences, If requil'8d, are to be shown
on paving and grading plans or c:IeYeIopment plans as appropriate.
LocaJ private basin fences must be 42 or higher on any side of
the basin where buildings or other restrictive structures are within
5 feet of the basin and have no points of exit or entry into the basin
area. Combinations of this option with other fencing rnay be used
as appropriate. .
... ..
....
--
82
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" vegetative ICIHning is UHd. pant materials must be in place
and establlshBd at the time the occupancy permit is requested.
,i~
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Provide railings as required by the Uniform Building Code for...
taining walls on any inlet and. outlet struCture headwalls and
wingwalls.
If-
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.
Provide signs to inform the public of the purpose of the basin and
the potential safety hazard resulting from stormwater
.....ntionldetention.
Danger
This basin is designed to collect
stormwater runoff.
Do Not Enter
uring rainy or. threatening weather
~PLE: 5lhIJ
.-.,
Inlets, Outlets and Splllway&
",,,*.
Basin inlet and outlet structures may be at or below grade, or a com-
bination of both. Engineering and safety considerations wiU play primary
roles in the design and sizing of these structures. However, their visual
charaCter should be in keeping with overall basin design, landseaping,
and multi-use potentials, especially where structures are highly visible.
83
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-
.-.
Guidelines for VIsible Inlet10utlet Structu...
Provide subsurface "drainage crossings whelWY8r incoming runoff
crassespeclestrian paths or sidewalks.
-
~,
-...'
.-
Stabilize soils around InletlDutlet structures to deter erosion (see
Section 3.3.3.)
.....
--
Avoid placing spillways within major sight lines. If no atternative
location is available. meander and screen them from view.
.-
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.-
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..;0
......
ll!.
-
.-
--
84
-
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4.3.2. Basin Landscaping
Retention basin landscaping should respond to the recessed nature of
the landform, the scale of the facility, its potential for mutti~use, and the
occurrence of frequent flooding, Plant materials should perform the
following functions, where appropriate:
Define spaces for multi~use activities
Provide shade and wind control
Act as a screen or buffer
Attract .wildl ife
Add visual interest texture, color, skyline sillouette
Protect the facility from erosion damage
Landscape Themes
-".".
Riparian Landscapes are informal and rusticwith curving lines. natural
materials, and a relatively lush appearance, Densely massed trees and
diverse understory growth are iiTIportant features. Plant forms should
be naturaJand free in shape, Trimming or thinning is done to control
the sizeot plants but there is no shearing or shaping. Both native and
introduced plant materials may be used to create riparian landscapes,
8S
-
Transitional landscape include plants that look at home with the or-
namentallandscape and the exis1ingdesert vegetation. The main func-
tion is to blend two landscape types together to create a uniform whole.
-
-,
.-
-
-
Natural landscapes include plants nativetothe site and are not as lush
in appearance as t"iparianlandscapes. These areas may be enhanced
by the addition of similar non-native drought-tolerant plants. Natural
landscapes are informal and placementof plants is random and should
be done as naturally as possible.
-
.,."
.~
-
Formal Landscapes are created by producing a feeHngofgeometry.
precision and containment. Plants that grow naturally into contained
shapes or accept training Should be used.
-
-
-
.,Ii.
-
86
-
Urban Park Landscapes are informal and open. Large shade trees and
use able areas of grass are importantfeat!Jres. Trees should be massed
to enhance the scale of the space and define activity lones.
Selection and placement of plants must be compatible with flood eon-
trol, as well. In general. keep vegetation out of flOw channels and away
from inlets.
Guidelines: General Planting Concepts
Preserve existing vegetation as much as possible.
Mass vegetation, varying the degree of diversity, size and texture.
87
() <) ~3~' (~)
Relate masses Qf vegetation to scale of basin site.
- .
- -
.
- -
~ .-
-
- -
. . .
Avoid homogenous groups of vegetation around basin.
. .
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- -
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--
--
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-
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~-
Basin side slopes I'NlY be planted to mltig8Bt or accentuate the
slope.
For basins located adjacent to arterial thoroughfares, planted
areas should account for at least 35% of the total baSin area.
Plant materialS can be groupecl~ on berms to create an island
effect.
89
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~"?" .
Use vegetIlian in conjuction with berms to screen fences or flood
control structures where used.
LandlC8pe Materials
Plant rr... ,arials for use In retentionf detention basins should be able to
withstand periodic inundE~n. Lanctscape design should comply with
applicable city end county f7il9uJationS, ordnances and policies. For non-
flooding Jocations plant materiats shouJd be selected from ChIptBr 18.73.
Pima County Zoning Code Landscape Design Manuat (October 1885).
For locations within the flood zone. use the varieties shown .on the lists
included in this section, which have been selectee ,;::Ir tolerance of in-
undation. Sols for backfilling planting pits within the flood zone should
be appropriately amended for wet and saline soils. Refer to Bruoks,
1984. [60]
GuideUnea: Soil Preparation for P&anting
To prepare soil tor turf installation, distribute 400 pounds of
granular soil sulphur and 2.000 pounds of agricultural gypsum per
acre. Disk thoroughly to a depth of 6 inches. Disking operations
should be conducted only when soil is not excessively moist or dIy.
Backfill mixes for tree and shrub planting pits should be based
on site soil conditions. The following mixes should be used:
Sandy loam soils - 30% wood fiber muich, nitrogen stablized -
70% site soil
Clay loam soits ~ 30% wood fiber mutch, nitrogen stabilized - 35%
sand - 35% site soil
Add. per cubic yard of mix: - 5 pounds 16-20-0 fertilizer - 3 pounds
granular soil sulphur -20 pounds agricuttural gypsum
Thoroughly incorporate these items into the soil mix.
Trees
Trees may be used on basin side slopes, bottom, and periphery.
They may not be planted in flow channels.
90
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QuldeUnes: Use of Trees
Provide a minimum of 20 treeS per acre.
Minimum treeliZ8 should be 15 gallon' or an equivalent height and
caJiper as set forth by the American Association of Nurserymen.
Thirtyothree percent of trees on arry basin site shOUld be a 24 inch
baDt or larger.
Mass trees In groups cansisting of three or more. Distance bet.
ween trunks'of individual trees .in any grouping should be no
greater than 75CMl of its mature crown spread.
The following varieties of trees are recOmmended for use in areas
subject to inundation.
Botanical Name
Acacia sp.*
Casuarina equisetifolia
Casuarina strida
Celtis reticuJata
Cercidium floriclum
Chilopsis 'inuris
Eucalyptus microtheca.
Eucalyptus camaldulensis
Eucalyptus sicleroxylon
Eucalyptus viminaJis
Geijera parviflora
Gleditsia triacanthos
OIlnermis"
Parkinsonia acuteata
Pithecellobium flexicauie
Populus fremontl.
Prosopis sp"
Salix gooddingn-
Sophora secundiflora
Tamarix aphylla.
Vitex agnus castus
Common HIIme
Acacia species
Horsetail tree
Beefwood
Canyon hackberry
Blue palo verde
Desen willow
CooIibah tree
River gum
Red ironbark
Manna gum
Australian willow
Honey locust
Mexican palo verde
Texas ebony
Fremont cottonwood
MesquJte species
Gooctding's willow
Mescal bean
Athel tree tamarisk
Monk's pepper tree
· Recommended for salt toierance.
91
:-j"
/)PI~
--
--
Shrubs
Shrubs may be planted on basin sideslopes (both ab':!Y8 and below the
flood zone), in the periphery, and with special precautions. in the basin
bottOm. They may not be planted in flow channels.
GuIdeU...: U.. of Shrubs
--
-.--
Use in masses. reserve single placement for accent specimens.
Minimum number of shrubs in anyone mass should be five. Vary
the number of individual plants from group to group. A minimum
of two shrubs for each tree is recommended. -
-~-
--
-
----
--
-.-
Distance between shrubs in any group should be no greater than
75% of its mature spread.
--
-..--
Sl
-
-
t:: O.tJ.
~-_.
35% of shrubs should be 5 gallon. The minimum shrub size is 1
gallon.
-,..~
Avoid placing shrub masses in flow channels.
-..-
For Ioce~!on with the flood zone the following varieties. which have
been sejected for tolerance of inundation. are recommended:
--_._~
92
-_.~-
!.'
-/
~R?.s
-".
I
--
-
--
.--
~
--
--
--
Botanical Name
Common Nmne
Atriplex lentlfarmis "Brewerf'"
Bacharis sarothroides-
Cae8alpinia species
Casia species-
Cortaderfa selloana
DocIon8H viICOIa
Elaeagnus ebDIngel
L.arr8a tridentata.
Ligustrum japonicum-
Nerium oleander
.xylosma congestum
BnMW Saltbush
Desert Broom
Birds of Paradi8I
Cassia
Pampas Grass
Hopbush
Ebbing SlIverberry
CnIoIaI8
Japanete PrMIt
Oleander
XyIosma
-Recommended for salt tDIeranCe
GlDundccMtrs
OI'ganic groundccMrs include kJN.growIng shrubs, grouncU\ugging sur-
face plants, turf grasses. and clumping grasses. They may be used
anywhere on the basin site.
Guidelines: Use of Groundcovers
Do not use densely matted groundccMlrs with heights over eight
IncDs in channels. Design channel C&pICIty must account for this
height of groundcov8r.
May be used where erosion control is necessary.
Plant in masses in scale with size of basin.
The following varieties. which have been selected for tolerance
of inundation. are recommended for use in the flood zone:
Acacia redolens
Atriplexsemlbaccata.
Oenothera drummondii
O. berlandieri
Vinca major
Cynodon dactylon
Pmstrate Acacia
Australian Saltbush
Baja Primrose
Mexican Evening Primrose
Periwinkle
Bermuda Grass
-Recommended for salt tolerance.
93
/i
,()~~
--
-.-
Berm
fields.
andQ.
ass may onty be used on sports fields or multi-use play
J88 of Bermuda grass must comply with applicable city
f regulations. poJjcies and ordinances.
-..
Seeding
While the planting individual trees and shrubs is desirable It is im-
practical for achiew Ig revegetBtion over large sites. GroundC0Y8r plant-
ings consisting of natiVe grasses and forbs... ueefulln f8StOring desert
cover and in preventing erosion. Seeding is tn. most practical way for
achieving this type of revegetation.
Ca.. ,delines: Seed Application
Use of seeding for revegetation should augment-t .;t replace
container planting.
Seed should be of the lams' 38BSOn'S crop of pure live seed and
should be deliYered.in original sealed packages bearing the pro-
ducer'sguaranteed IU1Idysis.
Soil preparation and seed scarification should be adequate to in-
sure proper germination.
-
---
--
--
---.~
_.
Atl seeded areas should be irrigated and kept in a constant state
of moisture until germination has begun..After germination irrigate
as required to insure proper establishment of.plants.
-
Establishment for grasses and farbs should be to such an extent
that tm' p&anted seed should yielc:l an average of at least five (5)
healthy piants per square foot within a reasonable time after Seed
application. Establishment of tree and shrub species shouIc:IAlIBte
to the seed supplier.s specified gennination rate for each species.
-
-.--
The proposed seed mixes will be appropriate for most conditions en-
countered at retentionldetention basins in Pima County. However, other
seed mixes can and should be considered.
-
The following plant materials should be avoided within the ftood zone
due to disease susceptibility.
Buxusmicrophylla japonica
Citrus (aU species) .
Cynodon dactylon hybrids
Hedera (all species)
Leucophyllum trutesc8ns
LoIium multIDorum
Rosmarinus officinalis
(ail varieties)
WashingtOnia (all species)
94
-
Japanese Boxwood
Citrus
Hybrid Bermuda grass
Ivy
Texas Ranger
Annual Rye grass
Rosemary
Palms
-
-
--.
_...
tJo/ 7
......'~
Inert Materials
~
Inert groundcover materials are recommended at basin siteS tor:
Reducing water consumption
~
Ease of maintenance
Dust control
Erosion control
~
For general baSin landscaPing, both riwtrstone and decOfnP088d granite
are eppropri8te. SancI may be used at playground of fitness facilities
where a more resilient materialls desired. Overall, inert groundcOvel'S
alone should not comprise over 35% of the total basin area.
~
Decomposed granite provides a fine-textured, walk-on surface. Its
drawbaCks are that it is easily eroded and washed away, it may stain
in areas of standing water, and silt deposits are highly visible on its
surface.
,-
Guidelines: Use of Decomposed Granite
Use in areas where people walk, where grass is not required.
USe only on side slopes 4:1 or flatter.
00 not use in basin bottOm.
Do not use in flow channels or near inlets.
-
Large diameter (eg. six to eight incheS) river stone as a basin
groundcover has exhibited the ability to resist removal by flowing
water. ccntrDI erosion, and accommodate sUt and sediments within
its void space when placed in baSin bottoms.
Guidelines: Use of River Stone
Do not use in activity zones or where people will be frequently
walking.
~""
,--...
95
P//~/,
--
Use large diameter stone (eight inches plus) on surfaces where
water will stand. . .
--
--
-,-
-..--
-~
Vary rock size in areas that represent natural drainage channels.
-~-
4.3.3. Erosion Control
--
-
_..
-~
--~.
Erosion control may be necessary on steep side slopes. along chan-
nels, adjacent to inlets. or any other location where flowing water may
threaten the stability 'of ground or embankments. Erosion control may
be done through revegetation, use of Inert materials, or a combination
therof. The use of grasses in ,flow channels may affect the hydraulic
characteristics of the.channel. Refer to ~ 1954 (81) for more detailed
information on grassed channel design.
---
-
In smaller areas, or at highly visible locations, revegetation for erosion
control may be accomplished by planting individual trees, shrubs, and
groundcovers. Soils are then protected by foliage aDsorbing the impact
of falling rain and by root systems which hold the soil in place. On larger
sites, seeding may be used to augment container planting for
revegetation.
Inert material will typically be used where potential for erosion is severe.
Use of these materials should be properly engineered and should re-
spond to aesthetic considerations.
96
_.
---
_.
...,.--.,
~~?
-
lnen material for eroslon control Include:
,......,.
Rock rIp.rap (610 12 inches diameter).
Boulder rIp-rap (24 Inches and Iarger).
Gabions
Soil Cement
,......
RjyerStone
--
Geotextlle mats
--
Combination methods consist of men materials with voids that allow
vegetation to grow up through or around them. The result is a very
durabJe, attractive method of protection. These include:
Articulated revetment units (ARU's).
Geotextiles
Ri~rap can be vegetated by using soli to partially fill the wid spaces
ancI applying a grass seed miX.
4.3A. LanclKape irrigation
Permanent irrigation systems are required for turf areas and most types
of basin nwegetation and landscaping. Revegetation efforts (mcluding
seeding) with native or drought tolerant species require a temporary
system for effective germination and establishment. Whether perma-
nent or temporary, systems within the flood zone must be designed to
tolerate inundation and silt accumulations.
Guidelines: For Irrigation System Design
Piping should be zoned in the following manner, with independent
control each zone:
-
basin bottom
basin sides below high water mark
basin sides above high water mark
~basin areas
Locate valves. controllers, wire connections. and main line out-
side the flood zone.
Enclose controllers and valves in vandal resistant boxes and
screen from view.
In baSin bottoms. mount sprinkler heads on swing joints to allow
for adjustment to silt accumulations.
,.,
PIP;
Use gear driven closed cue heads in flood zones.
Avoid use of law pressure drip irrtgation systemswlttlin the flood
zone. Low operating pressure and small emitter orifices allow for
sit intrusion, clogging, and maintenance problems.
Refer to Pima County ParIes and Recreation standard irrigation
specifications for further Information on irrigation system design.
98
,J
-"
- -
- -
_..
_..
-
_.-
~-..
-
-
- _._-
-..-
- -,
-
-
-----
-.--
_..
-.-.
tJ/ttI/
Report Submittal and Review Requirements
~':'~
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-
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V. Report Submittal and Review Requirements
5.1 Submittaf Procedure
-
-
It is inI8ncIed that IkJrmWater dl1Bntiorll','lIlIbn1tian ftJPOI1S wiD be prepantd
and submitI8cI in conjunction with the hydrok9c and hydraulic report re-
quired for each proposed .deYeJopment within Pima County or the City
of Tucson. Therefor&, the submittal procedure. tJr atorrnwater det8n-
tionIr8tention repons shall be idellticaI1D the procedures followed when
submitting hydrotogic and hydraulic reportS to the appropriate nMewing
agency (i.e., either Pima County or the City of Tucson).
5.2 Stormwater Detention/Retention Report Requirements
This section provides a Jist of I8qUired items to be included within SIOrm-
water detentionIr8len reparts aubmitl8d to either Pima County or the
City of Tucson in conjunction with development plans, tentative plaia, or
paving and drainage imprtNement plans. Detenlionlretenticln reporIs may
be submitted as an integral part of the hydrotogic and hydraulic report
f8QUir8cl tor all proposed developrnenlS, or as a sepende, but complete
report which addresses only detentionlretention. Oetsntionlr8t8ntion
reportS may be r8quirecf by the appropriate f8Viewing agency at the time
detailed engineering analyses are presented for nwiew.
The following Items represent the minimum requirements tor inclusion
within a stormwater detentionlretention report:
1. Cover Sheet
-
-
-
--
-
-
-
-
Title of report.
Engineer's name, address, and phone number.
Client's name and address.
Date of report completion.
Seal and signature of the responsible registerec::l professional
civil engineer.
-
~
2. Table of Contents
-
,-
list of tables and Illustrations.
Seal and signature of the responsible registered professional civil
engineer.
-
3.
Introduction
-
lDcation map showing the project in relation to adjacent pfOJ>
erties, streets, and nearby watercourses.
A legal description of the project parcel.
A description of the existing and . proposed land uses within
the development.
-
-
-
99
-
~ /' tfJ .;$..
--.,.,....---......~---_._-----...._.-..---...... ...-----------.-
A brief sum"*y of any aVailable existing hydraloglc an~r
hydraUlic studies or informatiOn which pertains to the project.
Nate: Sections 1-3 will not be required when the det8ntion1rwten-
tiCn report is i~,6d within a trjdIoIogit ancI hydraulic report
. which provides the necessary informIdiOn.
4. ObjectNes and Procedures Section
A brief summary ofb IKIt1)OI8 of the report in relation to the pR;
ject, and a description of the methodoJOgy and.br any pertinent
assumptions used in preparing the.report.
A..ment of the applicable detentlonhetention naquir8mems to
which 1M proposed dev8lopment must adhere.
5. Hydrology Section
. A draInage-b8SIn map Which ctearty delineates and Iabets aI1~
ce.lbAn points and drainage 8181SwhIch may affect the project.
Hydralogic data sheets for conce'lhation polnIs being considered.
These sheets must be ctearty labeled such that a correlation may
easily be made between the data sheets and theconesponding
concentration points on the dr8inage-buin map.
A summary table with a listing of all con~ ,ll.rion points, cor-
responding drainage areas. the calculated peak-discharge rates
for both pre.clevetopment and post.development conditions. and
the. differences in discharges.
6. DetentionIRetention SectiOno
A site plan which cI8arty shows the location of all praposed deten-
tion an~ retention systems, including the location. size, and type
of inflow anc:I outflow structures. Flow anUws and drainage divides
shall also be Iabefed on the site plan.
A description of how the detentionh8lention scheme will comply
with tandsCaping requil'8mems and grading criteria. Basin shape,
depths. and sideslope variations shall be shown both on the site
plan and on typical cross sections.
A statement of the minimum disCharge necessarytor' outftowfrom
the basin to occur, and an estimate of the recurrence interval of
this flow.
~eseNOir-routing calculation sheets for each detention/retention
basin for the 2., 1()', and 1000year1lows. At a minimum, the routing
calculation sheets shall consist of a working table for each bastn
and a routing table for each flow event. These tabtes shaJl pr0-
vide all necessary data, as shown in Tables 3.9 and 3.10 of this
100
,}
,h'.?r
-
-
manual. Detailed reservoir-routing calculation sheets &haJJ be re-
quired for review at the time that onsite grading plans. develo~
ment plans, paving and dnlinage impftMament plans, or oIher final -
plans are provided to the appropriate agency for review.
- Other calculation sheets used in determining the stage.outftow -
relstionships, sragHIDrage relationships, and other pertinent data
used in the basin analysis and design.
Plotted Inflow and outflow hydrographs. and water-surface -
elevations.
- A hydraulics section showing details of all intet and outlet &true> ~
tures, water-surface elevations, limits of ponding, etc. When
necessary, free body diagrams of retaining walls shari be provjd-
'!'l!"""'- ed which show all forces, moments and calculations required for -
determining factors of safety against sliding and overtuming.
7. Summary and Conclusion
-,
A brief summary of the anatyses and COI1Ckl8ions presented within
the report.
A brief description of how the proposed develo~nt will adhere
to applicable stormwater detention/retE' regulations.
-
.-w
-
-
-
-
-
101
-
.1
,...
~/~~
1
Bibliography
.('-~
,..,,~..
-.--,.
.. ..-
",....:.
-..... -. .
-.
.-
. .. . .-
_..~ ..~-...
4..' .
. ---.-
-. ....--
~.
a:
a:
l'
C
~
:t
)>
""C.
:I
-<
/J/P(,
-
103
~/~?
. ,
14. Wycoff, R.L., U.P. Singh, "Preliminary Hydrologic Design at Small Flood
Detention Reservoirs."' water Raources Bulletin, Vol. 12. No. 2. Amer-
ican Watsr Resources Association, April 1976.
So.1s
15. Guidelines tor installation of BeptIo-TIInk Systems, Pima County
Health Department Technical Services OiYiaion. October 1982.
16. s.nta Cruz San Pedro River Baln, ArIzDna, Resouraelnwtntory,
Us. Departm8nt of ~ Soil eon-vatiOn SerVice. August 1977.
17. Oppenheimer, J.M., Depth-to-Bedrock Map, BaIn and ~nge Pr0-
vince, ArIzOna, LabOratOIY of Geophy8tC8. UniverSIty of Arizona, Tuc-
son, Arizona, 1980.
18. Richardson, M.L. M.L Miller, Ganem' SoIlsllap, Pi.... COunty,
ArlzDna, US. Department of Agriculture, Soil Conservation Service,
March 1974.
Outlet StructuIH
19. Design of SrullDams, Us. Depamaent of the Interior, Bureau of
Reclamation, 1977.
20. Dmlnage and Channel Dealgn Standards for Local Dmlnage, Pima
County Department of1i'ansportation and Flood Control District, May
1984. .
21. Modem Sewer Design, American Iron and Steel Institute. 1980.
22. French, R.H., Open-Channel Hydraulics, McGraw-H1II Book Com-
pany, 1985.
23. Herr, LA., "Capacity Charts for the Design of Highway Culverts,"
Hydraulic Engineering CIrcular No. 10, U.s. Department ofTranspor-
tation, Federal Highway Administration. March 1965.
24. Herr, L.A.. "Hydraulic Charts for the Selection of Highway Culverts,"
Hydraulic Engineering Circular No.5, U.s. Department of Transpor-
tation, Federal Highway Administration. December 1965.
25. Sandvik,- A.. "proportional Weirs for Stormwater Pond Outlets:' Civil
Engineering, Amercian Society of Civil Engineers. March'1985.
26. Urbanas, B.R., Stormwatar Detention Outlet Control Structures.
American Society of Civil Engineers. 1985.
104
, ..P'L~..1
~-
I I
/.....
Hydrology
Zl. SCS National engineering Handbook, Section 4, "Hydrology:' U.s.
Department of Agriculture, Soil Conservation Service, August 1972.
28. Urblln Stormwater Management, Special Report No. 49; American
Public Works Association.
29. Boughton, WJ:;.. J.J. Stone. · 'Variations of Runoff With Watershed Area
in a Semi-Arid Location," Journal of Arid Environments, 1985.
,-:..
30. Chow. ~. Handbook of Applied Hydrology, McGraw-HUI Book eom.
pany,,1964.
31. HicicDk, A.B., A~ Keppel. B.A. Rafferty, "Hydrograph Synthesis br Small
Juid.Land Watersheds:'Agricultural Englneertng, Vol. 10, No. 10. pp.
6O&611.Octaber 1959.
32. Unsley, A.K.. Jr., M.A. Kohler, Hydrology for Enginee... McGraw-Hili
Book Company, 1982.
33. Masch. F.D.. "Hydrology:' Hydraulic Englneertng Cin:ular No. 19, U.s.
Oepertment of Transportation, Federaf Highway Administration. October
1984.
34. Miller, J.F., R.H. Frederick, A.J.Tracey, Precipltation-Fntquqency
Atlas of the Western United States, Volume VIIJ.Arizona. Us. Depart-
ment of Commerce, National Oceanic and Atmospheric Administration,
1973.
35. Osbom, H.e., LJ. Lane, Potnt-Area-Frequency Conversions for
Summer Rainfall In Southeastern ArIzona, Supplement to pro-
ceedings of the Joint Arizona Academy of Sciences Hydrology Seaion,
AWAA. Hydrology and Water Resources in Arizona and the Southwest,
1981.
-.
.
36. Zehr, A.M., V.A. Myers, Depth-Area Ratios In the Semi-Arld
Southwell United Sta: ',. Technical Memorandum NWS Hydr0-40.
us. Deparment of Commerce, National Oceanic and Atmospheric Ad-
ministration, 1984.
:n. Zeller. M.E., Hydrology Manual for Engineering Design and
Floodplain Management Within Pima County, Arizona, Pima County
Department of Transportation 'and Flood Control DistriCt, Septembe~
1979.
Water Harvesting
38. Cluff, c.e., .'The Compartmented Reservoir: Efficient Water Storage in
. Flat Tenain Areas of Arizona:' Hydrology and Water Resources In
AriZDn8 and the Southwest, Vol. a. American Water Resources Associ.
tion and Arizona Academy of Science, 1978.
:.'
~/~~
-
....-,
-
-
-
-
-
-
-
-
-
-
-
...
-
-
...
105
-
39. Ouff, C.B., Urban Water Harvedng System, tuc:.on, ArIIDna,Water
Resources Research Center, June 1984.
40. Cluff, C.B.. R.K. Frobel, WllterHarvestlng C8tchmentandRe8enlOlr
Construction Methods, Water Resources Research Center, Univer-
sity of Arizona, 1978.
QroundWllter/Water QUIlIIty
41. Babcock, J.A., st. al., Annulll Static Water........1c Data Report,
Tucson 8aaln, City of Tucson. Tucson Water, Planning Division, Juty
1985.
42. Bancleen, R.F., CUe Study Stmulatlonsof Dry Well D.....ge In the
Tucson e.aln, Water Resources Research Center, University of
Arizona. Publication '219, September 1984.
43. Davidson, e.s., "GeohydlOlogy and WIItBf Resources of the "1Ucson Basin,
Arizona:' Geological Survey Water Supply Paper 1131-E, U.S.
Geological SUrvey, 1973.
44. DeCook, K.J., LG. Wilson. GroundoWater Recha1ge from Urban Runoff
and Irrigation Retum&.Water Resoufces Research Center, UniYersity
of Arizona, Publication 1170, May 1980.
45. Hannon, J.B.. Underground DiIpoIIal of Stormwa.r Runoff Design
GuideUnes Manual, us. Department ofTranspoI1ation, Federal HigtMay
Administration. February 1980.
46. Murphy, B.A., J.D. Hedley, "Maps Showing Ground-Water Conditions in
the Upper Santa Cruz Basin Areas, Pima, Santa Cruz, Pinal and Cochise
Counties. Arizona:' Hydlaloglc Map Series.Report No'. 11. Arizona
Department of Water Resources, January 1984.
47. Randall, C.W., Stormwater Detention Ponds for water QualIty Control.
Proceedings of the Conference on Stormwater Detention Facilities.
American Society of Civil Engineers, 1982. ed. wmiam DeGroot.
48. Reeler, R.W.. c.v. Cady, "Map Showing Ground Water Conditions in
AvraJAJtar Valley Area, Pima and Santa Cruz Counties, Arizona 1981:'
Hydrologic Map Series Report No.7. Arizona Department of Water
Resources, March 1982.
49. Schmidt. K.O.. Results of Dry Well Monitoring Project for a Commer-
eilll Site in the Phoenix Area, Maricopa Association of Govemments.
Phoenix, Arizona. July 1985.
50. Smith,W.G., Wllter Quality Enhancement Through Stormwater
Detention, Proceeings of the Conference 01"1 Stormwater Detention
Faciliites, American Society of Civil Engineers, 1982, ed. William
DeGroot.
106
~I/Z>
-I
.-.,
51. Wilson. G.L. A ea.. Study of Dry Well Recharge. Water Resources
Researth Center. Publication 1202. Univ8rsityof ArIzDna. September 1983.
ErvalonJSedimentlltlon
52. Dmlnageand Channel Design StBndards for Local Dminage, Pima
County Department of Transportation and Flood Control District. May
1984.
-"
53. Santa Cruz San Pedro Alver Buln, Arizona, "..ouree Inventory,
U.s. Department of Agricu1tuf8. Soil Conservation Service; August 1977.
54. "Design Manual for Engineering Analysis ofFluviat Systems," Simons.
U & Associates. Inc.. March 1985.
55. Wischmeier. W.H.. D.O. Smith, Predicting Rainfllll Erosion Loaea,
Agriculture Handbook No. 437. U.s. Department of Agriculture. Science
and EduCation Administration. 1978.
56. Zeller. M~E.. YI.T. Fullerton. A TheoretlC8IIy-Dertvecl Sediment
TNnaport equation for Sendbed Channels In Arid Reglona, Pro-
ceedings of the o.B. Simons Symopsium on Erosion and Sediments.
tion, September 19B3.
.-
Construction and o.slgn Methods
57. . Hannon.J.B., Underground DIspo..1 ofStonnWllterAunoffo.algn
Guidelines Manual, U.s. Department of Transportation. Federal
Highway Administration. February 1980.
58. Kropp. R.H., Water Quality Enhancement Dealgn Techniques, Pr0-
ceedings of the Conference on Stormwater Detention Facilities.
American Society of Civil Engineers. 19~. ed. Wimam DeGroot.
--
Landscaping
59. Ankeny. D.. Civil Engineer. City of Tempe. Arizona. Personal
Communication.
'60. Brooks. Margaret, PhysICllI& PoHtlcal Pammeters Related to DesIgn
for ReclUtlon Use at Stormwater Detention BeSins In Phoenix.
Thesis, School of Renewable Natural Resources, Uniwtrsltyof Arizona.
1984.
61. Chow. Ven Te. Open Channel HydmuUcB. McGraw.HiII Book Com-
pany, New York. 1954.
62. Jones. Warren G. and Duffield, Mary Rose, Plants for Dry Climate.,
HP Books. Tucson. 1981.
107
IJ 1/ /-.
-
-
-
_.
-
-
~
-
-
-
-
-
-
-
-
..'
63. Kivela, Larry, Associate Planner. City of SCOUScIaIe. Arizona. Personal
Communication.
64. Natural Vegetation Committee. AriZona Chapter, Soil Conservation
SocietY of America. Landac8plng With NatIve ArtzDna Plants, Univer-
sity of Arizona Press, Tucson, 19TJ.
65. Retention Baaln Landscape Standards tor Arterial Throughfares,
Department of Planning and Development. CIty of Chandler. Arizona
66. Retention Buin Landscaping Criteria, City of Tempe Partes and
Recreation Department.
~. Traylor, Patrice. Planner. City of Chandler, Personal-Communication.
auln Configuration
68. Dlllinage Criteria Manual, Denver, Colorado undated.
69. Drainage Criteria, City of Tempe, Public Wortes Department. March 15.
1980.
70. Floodplain Management Ordinance no. 1185 Fel tor PIme Coun-
ty, Arizona, May 1985.
71. Me.. Engineering Procedura-Manual, Mesa. Arizona, June 1983.
72. Planning Guidelines Landform Grading Manual, Department of Ci-
ty Planning, Los Angeles, California, 1983.
73. Residential Storm Water Manllgement: Objectives, Principles. and
Design Considerations. Urban Land tnstitute, Washington D.C., 1975.
74. Scottsdale, City Code Requirements, City of Scottsdale. Arizona.
Multiple Use Concepts
75. Everett, Charles. ArldlEnvinHImental Wllter use Alternatives to Con-
ventional Urban Parkland, Thesis, School of Renewable Natural
Resources. University of Arizona. 1982.
76. Hebel, SUsan & McGann. DonaJd. Guidelines tor the Development
of Regional MultipJe-Use RetentionlDetention aasins In .Plma
County, Arizona, Pima County Transportation and Flood Control
District. 1986.
108
P//~
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PIMA COUNTY
DEPARTMENT OF TRANSPORTATION AND FLOOD CONTROL DISTRJCT
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JOHN Y. BERNAL
DIMCI'O"
(102) '....'0
FAX(102) 120.1.33
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May 17,. 1991
To: Stormwater Detention/Retention Manual Users
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Subject.: Depth t.o Gro\Uldwater
..,
The 1989 Annual Water Level Basic Data Ret>ort by Tucson Water
indicates the depth to groundwater bas increased by approximately
25, and in some cases 50 feet, from that shown on Figure 2.3 of the
Stormwater Detention/Retention Manual.
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,,.,.,,.-
When assessing the feasibility of designing a retention facility,
there must be sufficient vertical separation between the point of
discharge of the retention facility and the groundwater surface
elevation to prevent direct contact between retained water and the
groundwater, thereby minimizing the likelihood of adversely
affecting the groundwater quality. Because the depth to
groundwater has increased in some locations, the revised data will
not significantly impact this aspect of assessing retention
feasibility.
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_.
At this time, the District is not planning on revising the figure
in the manual. However, a revised depth to groundwater map can be
obtained by calling Tony Tineo of the Mapping and Records Section
at Tucson Water, 791-2631.
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g:~4r-
Da~e Smutzer, Manager
Flood Control Planning and Development Division
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DJ..S : JSH : jh
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xc: Brooks Keenan
:t-U ke Ortega
'lim Morrison
Torn. Helfri:::h
Yash Desai, City of Tucson
Pubh~ Wo.-kS Buildf'lg. 201 North Stone Avenue. Tucson. Artzona 8570'.1207
Ad~lnlstr2!1\It StoMces OMSlon . DeSI;Jr. Englneerrng OMStOtl . Flood Control Pl8Tlmng and Development OlVi$io.-,
Pr~:ty Maregeme:'U O~ . Transponatlon PIa."Ining and Dewelopment OMsIon
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-'1
MISSIon qoael Offu. 1313 SoutI'\ M!S$IOtI Road. Tucson, kllDl'lB 857'3.1398
Field Englneenng Orvi$ll)n. OperallOn$ 0I\Iis1On . TraffIc ErlQ1neenng DMsloo
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Board of Supervisors Memorandum
DEPAJrrKEH'l' OF DANSPOiUTIOB Am) FLOOD CORTROL DISTRICt
pagel 016
SubjeCt: llevise4 "Balanced and Critical Basin Map
for Study Session of .1&DWLry 2.7, 1987
RecolIIDendation: It: is recOllllended dlat the Board of Supervisors discuss
adoption of. a revised .Balanced and Critieal Basm Map.. Adoption of the Map
is proposed for the Public Bear1n& of February 1', 1987.
ReDort:
nis item complements the .Stormvater Detention/Retention Manual", specify1D&
ill map format, those designated areas to which certaill provisiOD.S of the
Manual apply.
On .January 19, 1982, che Board of Superv180rs approved lesolution Ro. 1982-FC3
adoptinc the languace aDd cODcept of requir1D& detention/retention of
stormwater runoff in those basi_ deaipated .. "balanced" or .critical". The
resolution directed staff to prepare both a map 8hoviD& suCh baatDs, as vell
as design standards for detention/retention. %he purpose of the resolution
was to maintain existina conclitioD8 for balanced bas1D8 by 11al1t1D& peak
disCharges from developed sites to values DO greater than pre-4eveloped
conditions and, for critical bastDa, to reduce ex1st1n& flood hazards through
detention/retention requirements.
%he Balanced and Crt tical Basin Map was adopted by the Board of Supervisors 'on
AprilS, 1982.. Since that tille, che Department of Transportation and Flood
Control District has determined that developaent occurrln& in additional
bas iDs warrants detentionlretention ..asure8. %he revised map presented
herewith includes both chose basins preViouslY adopted by the Board, and those
additional basins for which staff supports designation. Table A compares the
existing and proposed Balanced and Critical Basin Maps.
%he follovin& cri terla have been used in determinina which basins should be
included on tne present map:
1. Pursuant to. Floodplain Kana&ement Ordinance Jo. 1985-FC1, balanced
basins are those where che c:haDnels presently convey existin& runoff, but in
vhich additional runoff c~ot be safely contained. ~ritieal basins are those
in which the channels and draiuce structures CaJUlot safely convey existi1l&
runoff produced by regulator,y flows, or where habitable structures constructed
prior to the adoption of the Floodplain Mana&ement Ordinance are located in
flood hazard areas.
2. Basins tbat have been considered for inclusion are cenerally those in tne
metropo11 tan Tucson area where substantial development is likely to occur
wi thin the next decade, or where substantial ex1st1n& developments may be
. subjected to flooding.
%he followln& paragraphs discuss each basin and indicate the recommended
reculatory designation. %he basins are numbered on the lIlap, and categorized
within Table A.
:i
. _~(!l___"__..~_
I I
..
Subject: Revised wBal.aDced aDd Critical Basill llap
for Sc:udy Session of .JaDuary 27, 1987
page 20t6
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1. Tortolita Fan Area: This area has been designated as a critical basin
in the Tortolita Fan Area Interim FloodplatD MaDaaement Guidelines, adopted by
the Board of Supervisors on April 8, 1986. A portion of the area had already
been designated as cd tical on the 1982 Balanced and Critical Basin. Map.
Numerous flood-related hazards have been identified by the Torc:olita Fan Area
Basin Hanai-ent Study. includlD1: widespread overbuk flooding from natural
chaDJlels orisinatill& on the fan; unpredictable flov paths for major floods
orilinatin& at the fau apex; potential for floodtn.c to cross vatershed
boundaries; rapid and spatially unpredictable erosion and deposition alon& .a
liven stream; flooclilll due to inadequate culvert draiuace capaCities under the
Southern Pacific Railroad; and impassable ro&d~ clip sectioDS.
2. Loma de Oro 'Wash: this waterShed, located between the %ortolita Fan Area
and Bish1ancls Wash, vas adopted as a balanced buin by the Board on March It ,..
1982. Because an ez1stiDl cham:Lel COJUIU'Uctecl through the Loma de Oro
subdivision is inadequate, staff rec-~lI. thia basin be desilnated as
critical.
,.....
3. Hhhlands 'Wash: This vatershed vas adopted as a critical basin by the
Board on April 5, 1982. An undersized chamel throush a subdivision has
resul ted in severe floodina. Flood-related complaints are numerous. and
because of the inadequate chllftftel, there ia a potential for extensive damaae
durine lllajor flood ~vent. Flood hazarcl8 are dOCUlllented in the Bish1ands Wash
Basin Management Study.
4. Catalina Area
a. Rasin to the east of Twenty-seven Mile Wash that drains into the
CanaclaDel Oro Wash. Should be added to the map as a ba1aIlcecl basin
because of the potential for development to increase drainage prOblems.
b. Drainage flovine easterly into the Canada del Oro Wash. Peak
discharges should be 11m1 ted to ex1st1UC values because of the severe
potential for erosion on extremely steep slopes underlain by erodible
materials. This vatershed should be added to the map as a balanced
basin.
5. Riverside Terrace Area: InclUdes Pegler, Hanini, Casas Adobes. Citrus.
Roller Coaster. and lower Carmaek Washes, as vell as the West Oranee Grove and
West Ina basins. Portions of this area vere designated as balanced basins by
ue Board of Supervisors "on April 5, 1982. The West Ina basin vas designated
as critical by the Board because it vas included vith the Horth Ranch basin
..,/
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Subject: Reorise4 -BalaDCe4 alii! Critical ks1D Map
for Study SeaaiOll of ,JaaUAr)" 27. 1987
page 3 016
at that time. All of the baSiDS studied in the Riverside Terrace Basin
Management Plan were foUDd to pose floodiD& problems under coDC1itioDS of
existing developaent. The li'f'eraide Terrace Basin Manalement Plan recODllDencls
the entire area," with the exception of West Iu basin, be desiluted
critical. Staff proposes that the exist1n& balanced desll1Ultion be continued
and evaluate for each specific 4e'f'elopment at the time Df rezoniD& for
enactaent of critical basiDs requireaenu UDCler interill floodplain mlu-cement
luldeltDe8. Staff also proposes to withdraw the West IDa Basin from the Korth
Ranch basin "into the liverside Terrace Area.
6. Ruthrauff Road Area: Within this area the overall clraiDale is extremely
poor, and c1rainaae faciUties are almost uouez1stent. noocl1n& problema have
been documented in the Ruthrauff load Area Critical Watershed. Hanaleaent Plan,
and affect homes, businesses, and access. the basin has already been
des1gnated critical by the Board.
7. Friendlv VillaR. and Rorthmanor Washes: Severe c1raiDaCe problems
currently occur in the Rortbw',ftor and FrieD4ly Vi1l..e subeli via i ODS , where
constructed clrainacewaya caDIlOt convey the flows with low return intervals.
'rheae basins ahou1cl be a4c1ed to the map aDd 4eaicnated as critical.
B. Finl!er Roek Wash and ValleY View Wash:' 'theae washes in the Catalina
Foothills area have . floodiD& aDd. erosion problems caused by 1na4equate
cllmllela, diverted. floodwatera, ad homes loeated within the flo04plam, as
documented in the Flecha Caicla Impro'f'emmt Stud,. . 'rheae baa1DS should be
chan&ed from balanced to critical.
9. Ventana Canyon: Because of the ateepe.. of the terrain, 40wstream
flo041n& couldlreatl,. increase with cleveloplllent unless this basin continues
to be designated as a baluacecl basin.
10. Tr.s Hombres and Woodland Wash Basins: Several drainaae problems have
been reported in the 'f'icinity of Rio 4e Oro Drive and Sierra 4e Luna Way
(Section 2B, Township 13 South, llmae 15 East) due to natural and man-macle
channels which lack' the capacity to convey present discharges. The '.tres
Hombres watershed is characterized b,. poorlY defined channels on the fan
surface. In ad4ition, there wsta the potential for breakout of runoff into
Wood.laDC1 Wash. Both basins should be added. to the map and desicnate4 as
critical. .
11. Basin draininl! int'o Al!ua eaUent. Wash at MelDomene Wav: Natural
channels in the vicin.1~ of L1mberlost Road and Prospect Lane do not have the
capacity to convey discharaes Ireater than ex1stina. 'rhe basin should be
added to the map &Del desicnated. as balaaced.
~,~
{)/I~.
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Subject: Reyised -Bal.aDCed aDd Critical Basm Hap
for Study .SesaiOD of .January %7. 1987
page 4 0'6
12. Watershed enterin2 'fanoue Verde Wash at Soldier 'frail: This wash should
be added to the map aDd desisnated critical because of inadequate
drainageways and current drainage problems in the Fortyniller' s Country Club
Estat~~ subdivision.
,."'-
13. Fortvniner.s Wash: Drainasevays within FortyniDer.s Country Club Estates
subdivision cannot convey existiD& clischarges. '.the watershed should be added
to the map and designated as critirAl.
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14. Hidden Hills Wash and small ..ash at HOURhton Road:
have already been desianated as critical basins upon the
of Tucson. Flood hazards which alreadY ex1at within the
be worsened by upstream clevelopment.
%his two w&1.:.ersbeds
request of the City
City of Tucson could
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15. Earn Wash: PortiODS of this watershed upstream of Valencia Road should
be reclasBified from critical to ltalaD.ce4 due to cliversion of runoff from
part of the Earp Wash watershed mto the Roeleo Va"tl Detention Basm.
16. Airoort Wash: Under existiDg developed concUtioDS there bave Dot been
floodiq problems in the 1mincorporatecl portion of Airport Wasb basin, but
flood hazards will exist vi thin the City of 'racson if the upstream land is
developed. Also, the wash flovs across the Tucson International .Airport as
sheet flow. %0 prevent dOVD.8tream fioodin& azu1 to protect the airport, this
basin should continue to be designated as balaacecl.
17. .:Julian Wash and Rodeo Wash: nese basins have historically had flooding
pro'b~ems, especially near Littletown, Palo VerclelValencia anc1 alOD& Interstate
Dishway 10. Flood hazards have been documented for the .'Julian Wash by the
Arizona Department of Water Resources &Del within the City of TuCSOD limits by
the Federal Emergency Management Acency. As part of the J:olb Corridor
Proj eet, Pima CountY has scheduled improvemmta and detention basins which
will reduce flood peaks to the capacities of ex1st1n& d.rainage facilities.
However, future upstream clevelopment should' be required. to maintain this
improved flood-free condition through the use of b&1aD.cecl basin design
criteria.
18. Black Wash Area: nuB area includes the portion of Black Wash upstream
of Ajo Way and associated tributaries. Historically, floodiq within a
portion of this basin is severe and occurs 011 an annual basis. Flooding
affects major transportation routes and homes and businesses. Especially
flood-prone lands near Cardinal and Los Reales, have already been acquired
wi thfunlUng from the 1984 baud program. Dra1nage improvements are planned in
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pale of
5 6
Subject:
Revised "BalaDce4 aDd Cricical ..sill Map
for Study SeasiOll of .,J'1IIlUUY 27, 1987
conjunction vith roa4 construccion near Bopp Roa4 aad Tucson Estates Parkway.
Part of the area vas 4esipate4 as cricical in 1982. Ad4itional areas
upstream of Ajo Way have been a44e4 4ue co ext.stinc flooding problems in the
. vicinity of. Postvale Roael, aDd the potadal for upstream 4evelopment to
1ncrease flooding.
19. Valencia Wash Area: This area includea Valencia Wash an4 other
tributaries to the West BrlLllCh of the Santa Cruz River. 'l'hese basiDs lack
adequate ("bAft'ftels ancl outleta, but the ez1st1D& flood problems are not yet
sever~. 7he area ahould centmue co be clea1paced as b&1allee4.
20. Tucson Mountains: %his area is affected by noodiD& which severely
11mi ts access, clue to the 1lUIIlUoua roadway dip sections an4 ina4equate
culverts. Inadequate culverts, however, MY be serri.D& cleceDtion needs. 7he
flood1D& CODcli tiODS are described in detail within the 'Iucson Momtain Basin
Manaleaent Plan. At this tiae, staff propoaes to evaluate each specifiC
4evelopment at the tille of rezoD1D& for aactmmt of critical or balance4
basin requirements rather thm clesipate the area as either balanced or
critical. 7he formerly balanced Painted 11111 buiD should be iDc1ucled vith1D.
the Tucson Mouncain unaaemmt area.
2.1. Green Vallev. drainu.ev8VS ~. 4. 5. 9. 1!. and 17: 'l'hese basiu bave
been studied by Pilla ComtY and the Arizona Department of %ransporcation. The
ex1sti11l culverts UDder Interstate Ki&hV&Y 19 are inadequace an4 cause
floodwaters to poncl. As a result, llei&hborhoocls are flooded and damace to the
Interatate has occurred. Basins 3, Il, 5, and 17 should continue to be
designated as critical. Watershed 9 is also characterized by aevere
erosion, vhile watershed 13 is object to floodiD& vlaich breaks out of the
channel. '.the desipation of drai1la&evay. 9. and 13 should be chanled fr_
balanced to critical.
22. Green Vallev: DrainaRewa". 1. 2. 6-8. 10-12. 14-16 and 18-25 in Green
Valley currencly bave adequate capacities'to CGDvey raDoff, but culverts under
Interstate Highway 19 lillit the capacity of the syacem. 'these vatersheds
should continue to be desipaced as 'balacecl to lIlaiDtainthe capacity of the
existing system.
23. Aio. Gibson Ar~ovo: Should be desipated as critical. because of
existing drainale problems in the H_er Brown aubcl.i vision.
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Respectfully submitted,
Craig V.
Direct
:.">
IJI/t :.
i:
_ :_. JI
Subject Revised -Balua.t:ed aDd Crlcical Baaill Map
for Scudy Seasion' of .:January 27. 1987
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TABLE A
BALA.RCED AIfD CRITICAL BASIBS
. As Proposed t.o the Pima County Board of Supervisors
......
BALANCED BASIBS
As ProDosed
LOllla de Oro Wash
Cat.allua Area
Vent.ana Wash
Melpomene Way Area
Earp Wash, upstream of Valencia
Airport. Wash
Julian Wash-Rodeo Wash
Valencia Wash
Green Valley 11-2, 6-8, 10-12,
14-16, 18-25.
Previous (1982)
c""
Loma de Or" Wash
Riverside Terrace
FiDler RocklValley View Wash
Ventana Canyon
Airport Wash
Julian Wash-Rodeo Wash
Valencia Wash
Painted Hill Wash
Green Valley 1-2, 6-:16, 18-25
,,,"
INTERIM GUIDELINES
.:Januar.y 27, 1986
C2InCAL BASINS
As ProDoselS
Tortolita Fan Area
BichlaDcls Wash
Ruthrauff Road Area
FrieDdly Villace-
Hortol-lIIaDor Wash
Fiqer Rock-
Valley View Wash
Tres Bombres-
Wood.lands Wuh
Soltier Trail Area
FortYDiner's Wuh
Hid.den Bills Area
Earp Wash, downstream of
Valencia Road
Black Wash Area
Green Valley '3, 4, 5, 9,
13, 17
Ajo, Gibson Wash
Previous (1982)
Tortolita Fan Area
Hi&hlands Wash
Ruthrauff Road Area
Hidden Hills Area
Earp Wash
Black Wash Area
Green Valley 13, 4, 5, 17
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Riverside Terrace Area (inclucles West 111& Basin, fomerly part of the critical.
fiorth Ranch Basin)
Tucson Mountain Area (illclucles Painted 11111 Wash, formerly a balanced basin)
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Appendix G
2000 Revised Development Requirements for Drainage in
Northern Marana
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G
., . OCT-, T-OI 10:51 Fr..:retra Te~h lie
5208U52T8 7-311 P. 01/13 Jab-5'O
~^~t, /'
~.'( :t.
MARAHA
TOWN OF MARANA DEVELOPMENT SERVICES CENTER
December 4. 2000
All Engineers
Re: Revised Development Requirements tor Drainage in Northern Marana
.......----...---........--...----.-........------.........----....-......-..--......-...---......-.........--.................-................--..........--
This letter and ils accompanying documentalion are intended to rltvlse lhe contents and requirements
which are oonlained in .. Februery 2-4, 2000 leller addreased '0 all engineera concerning "Development
Requirements for Drainage in Northern Marana." Acconfingly, lhe Town of Marana Is now adopllng the
following flood-conlrol requirem.nle for Northern Merene:
,. MY sheet flow intercepted by e projoc:t shell be pessed through the project, oneite, or shllli be
accommodated via an approved alt.mallve fac~ity. Simply elevating a project out of a sheet-flow
ar.. without regard to the displaced floodwaters will not suffice.
2. Projects lacking suffic:ienl irnprove(j gr nalural receiving wale.. inlo which .Iormwlller runoff mllY be
discharged shall be required ta retain 100"10 01 ell an.sile runoff volume generated during tile design
atorm. The design atorm shall bo a l00-y"..... 1.hr storm, followed l:Iy a 10.year, 1-/" alorm. The
vOlume of runoff to be relalned shall be computed u$lng the applicable "Retention Volume Cha,,,-
attached to and made a part of this documonl. An ..mergeney overflow weir, which may d~charge to
an exlsllng public &tre8l, shall be provided as an element of any oncite retention facllily.
3. Ponded waler in local basins (i.8.. serving a single subdivision) shall rial exceed a depth of 2.5 feet.
Regional or sub-regional facqltles, serving parCelS grealer Ihan 100 acres in size, may be designed
to pond wal.r 10 a greater deplh if appropriate safely and securily meesures are incorporlled, with
lhe approval Of lI1e Town Engineer. easln "de-slopes snail be designed to be shallOW and ShOuld
nol exceed an average of 4H 10 1 V, The duralion at ponding permitted may be Increased 10 up to 36
hours lor local osslns. For sub-regional and larger basins. poneling will be permilted for up to 48
hours.
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If y<lU have any questions regarding the Implementation or epplication of thiS revised policy, please feel
free 10 conlact me or Mr. Farhad Moghlmi, also wilh the Town of Mlrllle, or Mr. John Slalh, will1 Tetra
Tech. regarding th. interpretation of till. policy. Please note that Copies of a Master DraInage Study of
the Town 01 Marana are ava~able tor revieW at the Town Development Services Cenler.
Sincerely,
James R. DeGrcod, P.E.
DewlOpmenl $ervlc:el Aclmlnillrillor
...... AItadlments: Retention Volume Charts (5) and Sunace Alea Charts (5)
cc: Mike Hllin
Farhad Moghiml
John Sialh
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. -OCT-IT-OI 10:59 Froa:Tolr. Toen IS'
mluml
T-lIl , OZ/13 Jo&-510
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MARANA
TOWN OF MARANA DEVELOPMENT SERVICES CENTER
...
Revised Development Requirements for Drainage in Northern Marana
-December. 2000-
<...
The attached charts are provided 10 give the development community a simplified approach 10 the
calculation of stormwaler runoff volumes for the design of new development projects in the Town of
Marana. The volume of stormwaler 10 De retained is equatto the accumulated runoff from a 1 DO-yr, l-hr
event and a 10-yr, l-nr evei'll. Charts 1 through 5 may be usad to delermine the runoff volume for
projects of up to 640 acres in size. Altematively, the storage volume required may be computed using tha
procadure outlined In Iha "Pima County/City of Tucson Relention & Delention Manual" for retention
volume calculation, provided both the 100-yr, l-hr and 10-yr, 1-nr lotal runoff volumeS are summed.
If multlpla basins are proposed for e prOj8ct, it is imperalive that all relention basin volumes be sized 10
lIccommode'e the Nnoff for the contributing watarched 10 each ratention area. In tne evei'll tnal
Intercllflnll(;ted basins are proposed, more detailed hydrologic and hydraulic modeling may De required,
Contact the Development Services Center for further guidance on modeling requirements.
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Ch",rt.. 6 through 10 era intended to be uoad for planning purl's,." and ths con~tructsd volume~ for
rellll\llon basins must be analytically demonstrated with the proJecl improvemenl plans. PhYSlcel
verification of the conelructed volume.. win el.o be required upon complolion of con6lruclion.
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USE OF CHART 1 THROUGH CHART 5
To use Chan 1 through Chart 5. simply find the applicable chart that envelopes the watershed size under
investigation, determine which curve on the chart best describes the proposed land-usa designation for
the site, and then direcUy determine Ih.. volume of .lormweter volume, in ecre-feel, the' must be retain..d
onsile, for the given watershed area involved. Nete Ihatlhs firsl-approximation esllmals of tne required
IlI<1d surface prol/td"d on Chert 6 ".,rough Chart 10 includu no provi.ion3 for freeboerd, nor provision. for
viSuel or recreatiOnal amenities placed within and/or around lhe relenlion facility. Inclusion of such
elements In tha design of a slormweler retention facility would, of couroc. increes" th.. required surfe"e
Br8a accordingly.
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use OF CHART 6 THROUGH CHART 10 (OPTIONAL)
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If desired by the Engineer, Chart 6 tnrougl1 Cl1art 10 may De used a5 aidS 10 a nrsl epproXlmatlon or the
lurface erea that would be required in order 10 provide an onsile slormweler retention facility with 4H to
tV sicle-Ilopes and a depth of ponded waler equal to 2.5 re91. To find me required surface area or a
retention facility with 4H 10 IV side-slopes and a lesser ponded depth, simply multiply the surface area
required et a ponded deplh of 2.5 feet, 8S found on Chart 6 through Chart 10, by Ihe following applicable
factor:
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Pondld Death lin feeO Factor
0.5 4.96
1.0 2.48
15 1.66
20 1.25
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'OCr-H-DI 10:59 FrGOl:Tttra Tech Ise
S201i452TI
T-311 P03/11 Job-SID
EXPLANATOFlV NOTES FOR LAND-USES DESIGNATIONS ON CHART 1 THROUGH CHART 5:
1. NATURAURURAL watersheds generally conlain no houses. to less Ihan one house per acre. and
.nticlpoted future drainage improvements are negligible. Impervious surfaces generally cover less
than 5% of lhe watershed araa.
2. SUBURIlAN watersheds generally conlain two houses, or less, per acre. and typically have IitUe or no
drainage improvements. Impervious surfaces generally cover approximately 15% of the wa\ershed
erea.
3. MODERATELY URBAN watersheds generally conlain from three to nve houses per acre (detached).
wKh moderote: 10 extensive: dralnego improvement.. ImpeNious surfaces generallY cover
approximately 35% of the watershed area.
4. HIGHLY URBANIZED watersheds generelly coolsin six or more nouu' p.r acr.. including Multiple
Dwelling Units. wilh extensive drainaga improvements present Impervious surfaces generally cover
approxlm8tely 60%. or greater. of the watershed area.
5. COMMERCIAL. INDUSTRIAL walersheds generally contain exlensive drainage improvements.
Impervtous surfaces generally cover llpproxlmlltely 60%, or greeter. of the wlIlarched area.
DEVELOPE'
.....1IbM~.........,V.Iurn. ",Dtfltrtng land......
(f'arClllI'bIbu*lg W...M4..... -._tto 2.D Acne)
0"
--
-- -- '- -
-- -- --- " _In ~t---
- -- ""' --- '. -- ,-l::: -- -. :-
,. - - -- -- . ,- ~
-- 1- - --
:. -- -
-- -. .... -- .. .- -- -. -- .- '"""
- -- -- -- f .- -- :~ FF"-
,.. .
- -
- . -- .
--' -
-. .- - -
~
C - -
: 'Tn: -j-I=f- '::~:::~=f::'I'=I:: :~F ---:~~I
0.7
I ..
o
~ CUi
..
I.'
o
~ 0.3
,
l0-2
.,1
.
0,00
0.25
.,,",
r1.15
'.(lO
, 2>
,..
1.10
2.00
ColltribuUnlll WlI~A,.. (fn&cnls)
t-. - N~ll.Iqlo.nc'-~~" ~
- =-=- Hj~.!I' urn. lAnd Us_
_. -. SutwruoLandUft'5 ... -. .lotidtIra~1lJrt)an --~,1U-.s 1
__Ccmmerl::aLtll\dw,1uI Uind Us..
CHART 1
JUlAEMENT5 FOR ttRAlPit"GE IN NORTHERN MAR.ANA.
TOWN OF.....RANA t OEVElOPMEHT SERViCES t:ENTER.
OECEIItIEII. """"
-;;,;,
~
~
=
g -
i
.
~ ~.
~
-
-
-
-
-
, -
~
-
-
-
-
-
-
-.
-
-
-
bqul_~' Rr.ntJgnVDIuJnu far Difhdng L..nd u.n
(FOIConlributine ~'-d Ana -1.0 ~ 'IG.G "='-1
.0
-H. - --
-- .-
-
::!.- J= -' n >-- --
0;:= I .-
-~O+ 0..: -- - I_ .-
n'
n
f-+-+-+ --
n ~
-
.-
~~~.- -~.~:t :-[8:!tr~Elt - -
. ~~f IT~ -- -..
:=.L' . '. ..- n:l-=-l=t:.i~ :1, l~ttJ~ ----
...... --. ,.. . - " C_:. --.. ::<=- -'CO ::.- -- :'.L:.
u __ _ _ _ _. _ --
u
j ..0
i 25
~ 2.0
~
)0 1.5
EO
! 1.0
O.S
0.0
2.0
'.0
'.0
so
..
1.C
1.0
9_'
1Q.0
Cm...uwlln; ..__tied An_ 4'n ~I
~UlnIlUaa
- - - HllI"tv Urbln Land UMI
_ _ _ _ S~n UncI ~ . . - -tvlodCfalely Urt.al'l ur.cI UMs
_ConlmItUallllKl~t-llJ1dU_'
CHART 2
oeftl.OPIIIENT AEQUIREMENlll FOR DRAINAGE IN NDRTtlEIlN MARANA
TOWN OF "_A I plVELDPlWIT SERVICES cenl!.
DECEIII8O, ZOlll
~
~
::
i
;
5
15
..
13
12
j 11
! 10
~ .
.
~ 7
~ .
! :
..
3
2
R.-qlit,..cl ~f R.-m.IOft V..,katat; fD( DiIIwIftg t...nd UMS
(for Conlrib..lina Widtrsbld ANu = 'D to CI AtftN.)
r:-
- ..
.- - ..- _. -
-
~ -
. - .- - , -f-
:= = .. . '- - . - - - -b
:... - '-1' ~ -
I- G< - .- ~ - f..:- - ... -
.. - ;. ..
.. j-
.. I- . , <- I-
l 1= -
.. .h. .- '~I':": '--
-- - u . n_ ..
.
"
15
'"
"
>0
J>
""
Cbr!tribuUng w....htd ""'1.1.n~.
bN.J.......L.aIdUSM
- - - ~~l.lIly~~~
- '-~Sublr.ln~dllWS --..~ &....~1IIt)i l.J'rI.-nLandUau
-CarmerciiIII~n:fUs,lnIl LwI Usm
CHART 3
DEVELOPMENT REQUIREMENTS FOR DR,llIiMlE IN NOIlTltE'" ............
TOWN OF.,,,,,,,,,,, I DEVELOPMENT SWRVlCES aN1ER
DECEtnlEA., BOO
-
-
-
~
~
= -
g
~
.
-
.
i':
-
-
-
-
~
, -
!
=:
-
-
-
-"
-
....
-
.-...
...
Raqulllld St.clrmWOler .a!Anti"" V.lllm.."'r DilIellng Llml U_
tFor Ccntributlng WatJIntMd...... &.u ta.1&e kIN)
60
50
~,...
~ ..
i
c
I 30
~
>-
"
i20
c
':'1
\0
o
A'
-j-
""
..
~ ~ 00 100 ,,0 1~
c....buUng W.t.lSbeld AIM (In KNla)
130
,..
'''''
t6C
Nalul3l Utnd lJ&e!;
- - -=-~vh1Y ~.2~~SE~ _.
- . Subultlln!...aM Uses
_ Commert;.ia"lfldU$\riaIl>>no Uaoes
. - ~t~y \ktIBn u.nd ~_:__J
CHART 4
OEVE.LOPNlENT REQUIREMEN'1'1i FOR DRAINAGE IN NORTHeRN MARANA
TOWN OF............ . D_LOPIlENT SERVICES CEIlftR
DECEUIlEIl. 20lllI
*":~'"
~
:::
:;:
Ii
;;.
.........-_n.__III!IorfngUrd_
(F-ecn...lIIing: w..w,.......... .. "'14C~J
t4ll
12O
...
j '10
~ ,1<1
~ 140
i 120
;;
>
'"
! In
..,
.0
zoo
2<0
..0
320
3<50
.00
...
.."
...
""
000
..0
CoJItribUtrng w.t....lwd ArM (in KIU)
1-' - - ~WntILilNlUW!5
---~l1~_~~U~
- . - . SUburtun utll Un.t . . . . . -~~ U7t8n LillIS U5G. J
-CcnmIrr.8l11l1l1latriill land lJMs
- --_. "--. -._________._. 0" ._._._.__._...._._.. _....._ _.._~__...
CHARTS
OEYELDPM!1fT REQUIREMENTS FDIl DR.lllMAGE IN NDRTKERlI MARANA
TOWN OF IIAIlAHA IDEllClOPMENT 5eR\III:ES CEN11!1I
OECEM8El1. 2.0.
-
-
-
~
r
=
..
-
-
.~~i<
-
-
-
-
~
, _..
'"
~
-
..~
..
-
-
-
"""
-
-
-
....;or
~d_lIaq_lor__"': 4ItIYS__.p__oIz.s-
(DJl TO D_I Ac..)
...
::::j
::t- -.. -- -- - -- m J:'
.-. -- ,.,. --
-- --
-- - - -:-i':1:-". -.
~
--
-
- - -
- -
...
- tJljct-:I- -
frl- -- ... .. -. - -- - --
-- --' .. - -' ". :: -
-- -- . .., -- --
-- --
- --
-- --
-
0.'
0.1
i 0.6-
Ii
!. 0.5
j QA
1
., 0.'
0.'
0.'
o
o
0.'
..,
RPentlon VoI.,..lln .w:r..tHt)
CHART 6
DEYaOPlIIENT RECjJIREWiNTS FOR DRAINAGE IN NDRrltRN ..A""....
T(MN (i'F MAJlANA ~ DFV'I.':LOPMENT SEA\,qCfS c:anefl
DECflolllER.2DlIlI
lI'''",*,
~
~
=
~
.
~
I
!. 2.~
i 2.J
~
~
I.'
Lolld___rvr__" 'ltlV----......... _o/u_
CU Ira 4":' A~)
u
u_ - I- ~
.- -- -. ... - .. :=1: ... -
.- - .. -
.. -.
- .. .. -- .. -- - .. --
- .
- u - ..
- .. - .
... .. .. .- '-- . I
..
-. .- -- .- .. - .. 1
- - ~!.-:. .- .- - .- .- ..- - ... .- - - .. =;:-
- -- ..
t .. ..- Ii. H-
)8
"
'.J
...
z.,
.~
00
'0
..0
7.0
'.0
9.'
10.0
R.wntlon \Iolvm.ttn~l)
CHART 7
~Ol'MENT REQUIllEMEHTS FDR DIWIlAGE IHNDRTHERN MARAHA
roW" OF MARAHA I oellELOl'",an- SElMCS CENlER
DEceMlIE1l, HOO
-
-
~
~
= ",.
~
~
~
~ -
~
-
-
,...,
-
-
..'"
-
~
-
-
-
.'.F
-
-
I
Land SurtMe~ f.~~: ~,y as.-st....PGndllld ~ af2.$Ft.t
(-4.0 to '1.5 A~)
~.5
16.0
15.5
15.0
14.5
1..0
13.5
13.0
.. 12.5
~ t2..
~ 11~
~ 11..
. 10.5
II 10.0
5 9.:lo
. 9_0
I II.S
.:; 8.0
,.,
10
6.
6.0
53
'.0
4.S
4.0
"
- . ,---
- .
..
'. -
ctc -..
n -.
.=L---l=1
: - .-.- :'~i=::lC-r-:-. .. ''''' = .. - .. ;~I
..-
. ~ ---- . .- -- =: == =
~V .- .- .-
- -. li,.; - -- n n
.::..-: -
-. -- -- - --
.. 1::;<< .. : u ::"F-': -I-=- ~ -- ~I
- -- c=::: -1'=
20 25 30
ftdBnlWn VahnN lln ~HlJ
,.
40
'S
CHART 8
DEVELOPIENT REOWREMENTS FOR DRAINAGE IN WOR1HEIW MARAMA
TOWN OF MARANA ! DEVELDPMENT SERVICES CENTER
OECEIl8!ER,201Kl
"",'"'-
lc_
~
~
i
~
~
i'i
~
~