HomeMy WebLinkAboutPacket, Notice of Intent Water Impact Fees
TOWN COUNCIL
MEETING
INFORMATION
MEETING DATE: July 5, 2005
TOWN OF MARAN A
AGENDA ITEM: IX. B. 3
TO: MAYOR AND COUNCIL
FROM: C. Brad DeSpain, Utilities Director
SUBJECT: Resolution No. 2005-81: Relating to Water Service; adoption of
water impact fee report and Notice of Intention to hold a public
hearing prior to implementing the proposed water impact fees.
DISCUSSION
The proposed water impact fees were presented to the Council on June 21, 2005. To implement
the water impact fees, publication is required by July 8, 2005, for a public hearing on the
proposed impact fees to be held September 6, 2005 at the Marana Council Chambers, 11555 W.
Civic Center Drive, Marana, AZ. After the public hearing, adoption of the impact fees can be
scheduled for September 20, 2005. If the impact fees are adopted, the first day for collection of
the rates will be January 2,2006.
If Council approves the water impact fee report tonight, Council may also adopt a Notice of
Intention to implement the water impact fees as of January 2, 2006. Council may, however,
approve the water impact fee report tonight adopt a notice of intention for a public hearing at a
later date. The public hearing may be held as late as October and stilI comply with the statutory
requirements for implementation ofthe water impact fees on January 2, 2006.
RECOMMENDATION
The Water Utility Advisory Committee and Staffrecommend approval of Resolution No. 2005-
81, approving the water impact fee report and adopting a notice of intention for a public hearing
on September 6, 2005.
ATTACHMENTS
(1) Proposal for Town of Marana Gravity Storage and Renewable Water Resource Fee; and (2)
Water System Infrastructure Impact Fee.
SUGGESTED MOTION
I move to adopt Resolution No. 2005-81, approving the water impact fee report and adopting the
Notice ofIntention for a public hearing on September 6, 2005, to implement the water impact
fees as of January 2, 2006.
BLU water impact lees
06/29/20054: 17 PM APM
MARANA RESOLUTION NO. 2005-81
RELATING TO WATER SERVICE; ADOPTION OF WATER IMPACT FEE REPORT AND
NOTICE OF INTENTION TO HOLD A PUBLIC HEARING PRIOR TO IMPLEMENTING THE
PROPOSED WATER IMPACT FEES.
WHEREAS, the Town of Marana desires to adopt a water impact fee report and a notice of
intention to implement water impact fees; and
WHEREAS, the Mayor and Council find that adopting water impact fees are in the
best interest ofthe Town; and
WHEREAS, publication of the Notice ofIntention is required by July 8, 2005 to set a public
hearing on the proposed fees for September 6, 2005; and
WHEREAS, after the public hearing, the adoption ofthe proposed fees can be scheduled for
September 20,2005; and
WHEREAS, if the water impact fees are adopted on September 20, 2005, the first day for
collection of the new rates will be January 2,2006.
NOW, THEREFORE, BE IT RESOLVED BY THE MAYOR AND COUNCIL OF THE
TOWN OF MARANA, ARIZONA that a water impact fee report be adopted and that a Notice of
Intention to implement the water impact fees be published by July 8, 2005 in order to hold a public
hearing on the same on September 6, 2005.
PASSED AND ADOPTED BY THE MAYOR AND COUNCIL OF THE TOWN OF
MARANA, ARIZONA, this 5th day of July, 2005.
Mayor ED HONEA
ATTEST:
Jocelyn C. Bronson, Town Clerk
APPROVED AS TO FORM:
Frank Cassidy, Town Attorney
DRAFT
Proposal for Town of Marana Gravity Storage and Renewable Water Resource Fee
1.0 Introduction
The Town of Marana (TOM) and its Municipal Water System have experienced substantial
growth in the last few years. At the end ofthe 2004 calendar year, the Town of Maran a
Municipal Water System (TMWS) had a total of 3,069 potable water connections. This is an
increase in customer base of approximately 45% over the previous calendar year. Based upon
current and projected growth rates, the TMWS will increase in overall size by approximately
thirty times that of its existing customer base. The projected growth of the TOM will challenge
the TMWS to responsibly accommodate the growth of its water system.
The purpose of the Town of Maran a Gravity Storage and Renewable Water Resource Fee
(MGSR WRF) is to place the cost burden offuture growth on the future development it is required
to serve. Two cost components are identified in the proposed fee. The first component is the
projected capital cost for the acquisition of the water rights required for the Town of Marana to be
self sufficient in complying with the replenishment obligations currently required by the Arizona
Department of Water Resources (ADWR). Costs estimates and acquisition assumptions are
made to project the present value acquisition cost for the water rights required to accommodate
the buildout demand projections.
The second cost component is the cumulative cost for water system infrastructure to integrate
new water supplies into the proposed water system. The additional infrastructure is required to
accommodate the necessary changes in water system operation resulting from the large projected
increase in the size of the system. This component of the fee is in addition to the cost of initial
infrastructure improvements including wells, reservoirs, booster stations and pipelines initially
required to produce and deliver water to new development which are not included in this fee.
2.0 Population and Demand Projedions
The planning area for the ultimate service area for the TMWS consists of the current TOM
boundary but removes areas including Dove Mountain and Continental Ranch which are currently
served by Tucson Water (Figure I). Details of the methods used to project General Plan detail
and the planning area are identified in Appendix A. Using the dwelling unit densities and land
use types indicated in the General Plan the data suggests that approximately 65,000 dwelling
units and 10,900 acres of commercial development are likely to be served by the TMWS at
buildout.
Table 4-2 of the 2004 Town of Marana Potable Water Master Plan develops a schedule for
Equivalent Dwelling Unit Factors (EDU's) to convert water consumption rates to a standard 5/8-
inch x %-inch water meter. Using these criteria for the future demand projections for the TMWS,
it is estimated that commercial demands within the planning area will be equivalent to
approximately 27,000 EDU's for a total of approximately 92,000 EDU's for the projected service
area.
Based upon 92,000 projected EDU's and consumption rates in compliance with the ADWR's
conservation requirements, the total potable water demand projected for the planning area is
estimated to be approximately 30,000 acre-feet per year. The non-potable demand for the areas
currently deemed for non-potable service is approximately 3,700 acre-feet per year.
3.0 Alternative Source Water Requirements
The 1980 Groundwater Management Act created the Arizona Department of Water Resources
(ADWR) to ensure that water supplies are adequate to meet the long-term needs of new
development. The Assured Water Supply (A WS) Program developed by ADWR requires the
demonstration that sufficient water supplies of adequate quality are physically, continuously, and
legally available for 100 years. In an Active Management Area (AMA), anyone who offers
subdivided land for sale must demonstrate an assured supply of water to ADWR before the land
may be marketed to the public. The TMWS has received a Designation of Assured Water Supply
from ADWR that provides prospective development within the Town's service area a 100 year
A WS. The developer for the subdivision is only required to obtain a written commitment of
service from the TMWS.
For the TMWS to meet its A WS requirements as a "designated" provider, it is required to limit
dependency on groundwater and increase its use of renewable water supplies such as treated
effluent and Central Arizona Project (CAP) water. The required amount of groundwater
replenishment is based on the amount of groundwater that has been withdrawn in excess of their
allowable groundwater account under the A WS program. How the TMWS manages its
groundwater account will rely greatly upon its effluent ownership. Currently the TOM is
working with the City of Tucson on an Inter-Governmental Agreement (IGA), which will allow
the TOM to own approximately 13,900 acre-feet per year of effluent based upon 30,000 acre-feet
per year of potable deliveries. Assuming that the TMWS will be extremely efficient with its
13,900 acre-feet per year of effluent, the minimum amount of alternative water required is 33,700
acre-feet per year (potable and non-potable deliveries) minus 13,900 acre-feet per year (effluent
ownership) for a total of approximately 20,000 acre-feet per year of renewable water required to
meet the ADWR replenishment obligation in a self sufficient manner.
In the desert southwest there are very few commodities that have a higher value than water
resources. The TOM is currently in the process of acquiring approximately 1500 acre-feet per
year of excess CAP water rights from the Flowing Wells Irrigation District (FWID). The
purchase price for this acquisition is estimated to be $560 per acre-foot. Other water rights the
TOM is pursuing are substantially more expensive, several of which could be up to $3,000 per
acre-foot. The total present value cost for the acquisition of 20,000 acre-feet per year of
renewable water is estimated to be approximately $49.5 Million. This projected cost includes a
20% contingency factor to cover cost changes and professional fees required for the preparation
of the documents required for the acquisitions.
4.0 Existing System Evaluation
To evaluate the impacts of the components proposed as part or the GSA WIF on the existing
potable water system, Chapter 4 of the Town of Marana Water Master Plan has been updated to
reflect the number of connections as of the end of calendar year 2004. The revised chapter is
included as Appendix B. The update to the Potable Water Master Plan indicates that there were
3,662 EDU's in the existing potable water system at the end of calendar year 2004. The master
plan update indicates surplus capacity in most areas. There are four isolated areas where there are
minimal deficiencies. All deficiencies are expected to be corrected by interconnects, pipeline
extensions or storage additions within the next few fiscal years. The water system components
and associated facility capacities are summarized as follows:
The existing water system has a storage capacity of 4,4 70,000 gallons with a storage requirement
based upon Average Daily Demand (ADD) times 1.25 plus fire flow of 2,709,2 10 gallons for a
storage surplus of 1,760,790 gallons.
The existing water system has a source (well) capacity of 12,971 gpm ( "Existing Well Capacity,"
Table 4-9, Chapter 4, Updated Potable Water Master Plan, Appendix B) with a source capacity
requirement of Peak Daily Demand (POD) times a 1.3 well redundancy factor of 2,317 gpm
(Well Requirement, Table 4-8, Updated Potable Water Master Plan, Appendix B) for a source
surplus of 10,658 gpm.
The existing water system has pumpinglbooster station capacity to serve POD plus fire flow or
instantaneous demand in its smaller systems. Currently, there are no areas where Peak Hourly
Demand (PHD) is greater than POD plus fire flow.
The existing system does not have any known excedences of Maximum Contaminant Levels
(MCL' s) as regulated by the United States Environmental Protection Agency and currently does
not and is not required to treat any of its potable water sources.
5.0 Infrastructure Requirements and Cost Opinions
The growth of the TOM will cbange the mode of operation of the existing water system. The
smaller systems currently operated by the TMWS are generally designed to accommodate
demands that are primarily dictated by fire protection requirements. As the system becomes
larger, the mode of operation will change and the summertime domestic peaks will dictate the
size of the required infrastructure. In addition, the TMWS will likely be required to treat and
distribute some form of Central Arizona Project (CAP) water into its distribution system. The
treatment and conveyance of new source will require additional infrastructure including larger
transmission mains and additional operational storage capacity to efficiently distribute water
throughout the system. The goal of the infrastructure portion of the MGSR WRF is to define a
treatment and pipeline distribution system to convey approximately 10,000 acre-feet of treated
CAP water throughout the planning area. From this infrastructure system, cost estimates are
developed to determine the associated impact fee.
There are four components that make up the infrastructure requirements for the MGSRWRF.
These components include Potable Water Treatment Facilities, Storage Facilities, Transmission
Mains and Pumping Facilities.
The treatment component of the GSA WIF is projected to be the TOM's share of a 30,000 acre-
foot CAP treatment facility to be constructed by the TOM, the Metropolitan Domestic Water
Improvement District, FWID and the Town ofOro Valley. For the purposes of this MGSRWRF
analysis it is assumed that the initial capital cost for the preferred treatment alternative will be
$83.56 million. Assuming a one third capital cost allocation to the TOM, the capital component
for the treatment alternative is $33.42 million, which includes 20% contingencies.
It was assumed that the method of treatment would be Slow Sand Filtration (SSF) with Reverse
Osmosis (RO) with either local brine disposal or brine disposal by pipeline to Yuma. The
treatment plant capital cost opinion is from the US Bureau of Reclamation (USBR) report,
"Alternatives for Using Central Arizona Project Water in the Northwest Tucson Area," published
August 2004.
To accommodate larger summer peak demands it is recommended that the storage capacity of the
existing system be increased by 25% of ADD to provide additional gravity operational storage for
the proposed water system. This additional storage will allow the more efficient pumping
operations while minimizing the required pumping capacities at high domestic demand periods
throughout the summer months. An additional benefit of gravity storage is the redundancy the
system will have in the event of power failures. The current TMWS policy is to require 125 % of
ADD for storage capacity. The MGSRWRF proposes an additional 25% or 6.7 million gallons of
storage be added to accommodate the operational fluctuations of the proposed system. An initial
layout of the proposed facilities is depicted on Figure 2. The cost for the construction of the
proposed storage facilities is estimated to be $16.8 million, which includes 20% contingencies.
The proposed gravity system will require that hydraulic grades be maintained througbout the
proposed system. Maintaining these hydraulic grades will require the installation of larger
diameter pipelines. The initial layouts for the proposed pipelines are included on Figure 2. Based
upon the hydraulic evaluation it is estimated that approximately 90,000 lineal feet of 30-inch
pipeline be installed in throughout the existing system. The construction cost for the proposed
pipelines is estimated to be $27.9 million, which includes 20% for contingencies.
The final infrastructure components of the MGSR WRF are the three pumping facilities proposed
to convey treated CAP water throughout the existing system. The proposed locations for said
facilities are depicted in Figure 2. Three booster stations are proposed and the estimated
construction cost for the proposed pumping facilities is $2.7 million, which includes 20% for
contingencies.
6.0 Impact Fee Calculation
Based upon the evaluation of the future demands and the capacities of the existing potable water
system, the cost of acquiring water rights and system improvements is $130AMillion. Table 1
shows the breakdown of costs.
Table 1. Costs for water right acquisition and system improvements.
Fee Component Total Costs Cost to meet existing Net cost to fnture
(million $) deficiencies system
(million $) (million $)
Water Rights 49.5 0.8 48.7
Storage 16.8 16.8
Treatment 33.5 33.5
Pipeline 27.9 27.9
Booster Station 2.7 2.7
Total 130.4 0.8 129.6
The MGSRWRF is based on the net cost to the future users ($129.6 million dollars) divided by
the number of projected EDU's (92,000) minus the existing EDU's (3,662). To meet these
requirements the GW A WIF has been determined to be $1,467 per EDU. Table 2 applies the
proposed fee by meter size for use in the collection of the proposed fee.
Table 2. Proposed MGSRWRF Fee Schedule
Meter Size EDU
(inches) Ratio
5/8 x 3/4 1.0 $1467
3/4 1.2 $1760
1 2.5 $3,667
1.5 5.0 $7,335
2 8.0 $11,736
3 15.0 $22,005
4 25.0 $36,675
6 50.0 $73,350
,
" DRAFT.
Water System Infrastructure Impact Fee
1.0 Overview
In the summer of 2004 the Town of Marana (TOM) adopted a new Potable Water Master Plan
(Master Plan). The new Master Plan developed policies and procedures for the Town of Marana
Municipal Water System (TMWS) to follow in the implementation of new projects and the
management of new development. The Master Plan completed a comprehensive review of the
capacity of the existing potable water system. The results of this evaluation indicated that the
existing system had surplus capacity in the majority of its existing service areas" This excess
capacity was related to capital improvements the TOM had made to the existing potable water
system. Chapter 7 - Implementation of the Master Plan, provided a general guideline for the
TMWS to use to sell portions of its excess capacity. The purpose of the Water System
Infrastructure Impact Fee (Infrastructure Fee) is to provide the TMWS a method to be reimbursed
for its excess system capacity.
The Water System Infrastructure Impact Fee (Infrastructure Fee) is a voluntary fee for the
purchase of existing source (well), storage and booster station capacity in the existing TMWS.
The TMWS proposes to distribute capacity on a fIrst come fIrst serve basis where available. In
the event there in not enough system capacity to serve a development, the developer will be
required to construct its own source (well), storage and booster station capacity. If the developer
participates in the construction of said facilities he will not be charged the Infrastructure Fee for
his project. The Infrastructure Fee as proposed is for source (well), storage and booster station
capacity only and does not include treatment or water mains associated with the connection to the
existing system. The Infrastructure Fee is also separate from the Town of Marana Gravity
Storage and Renewable Water Resource Fee (MGWSRWF). Figure I identifies the components
ofthe both the Infrastructure Fee as well as the MGWSRWF.
2.0 Existing System Evaluation
To identifY the surpluses in the existing potable water system, Chapter 4 - Existing System
Analysis of the Potable Water Master Plan has been updated to reflect current connections as of
the end of the 2004 calendar year" The revised chapter is included as Appendix k The update to
the Potable Water Master Plan indicates that there were 3,662 EDU's in the existing potable
water system at the end of calendar year 2004. The master plan update indicates surplus capacity
in most areas" There are four isolated areas where there are minimal defIciencies" All
defIciencies are expected to be corrected by interconnects, pipeline extensions or storage
additions within the next few fIscal years. The water system components and associated facility
capacities are summarized as follows:
2.1 Storage Capacity
The existing water system has a storage capacity of 4,470,000 gallons with a storage requirement
based upon Average Daily Demand (ADD) times 1.25 plus fire flow of2,709,210 gallons for a
storage surplus of 1,760,790 gallons.
2.2 Source (Well) Capacity
The existing water system has a source (well) capacity of 12,971 gpm with a source capacity
requirement of Peak Daily Demand (PDD) times a 1.3 well redundancy factor of2,317 gpm for a
source surplus of 10,658 gpm.
2.3 Pumping Capacity
The existing water system has pumping/booster station capacity to serve PDD plus fire flow or
instantaneous demand in its smaller systems. Currently, there are no areas where Peak Hourly
Demand (PHO) is greater than PDD plus fire flow. Each individual water pressure zone has
excess capacity and will have to be independently evaluated for surplus capacity based upon the
fire protection requirements of future developments.
3.0 Infrastructure Fee Development
3.1 Demand Criteria
Per the Marana Potable Water Master Plan, the domestic water demand for a typical 5/8-
inch x 3/4-inch water meter is calculated as follows:
Average Daily Demand (ADD) = (125 gpcd)(2.7 people/unit) = 350 gaVday = 0.24
gpm
Peak Daily Demand (PDD) = (ADD)(2.0) = 700 gal/day = 0.48
gpm
Peak Hourly Demand (ADD)(3.5) = 1225 gaVday = 0.85
gpm
Based upon the latest engineering design standards adopted by the TOM, the required
source, storage, and booster station capacities are calculated as follows:
3.2 Capacity Calculation Criteria:
Storage Capacity = (ADDX1.25)(1.l2) (Includes 1000 gpm FF capacity) = 490 gallEDU
Source (Well) Capacity PDD(1.3)(With largest well out of service)
=910galIEDU*day
Booster Capacity = (PDD)(1.4)(Assumes 1000 gpm FF Capacity) =980
gallEDU*day
= 0.68 gpmlEDU
The values indicated above include proportional fire flow capacity and redundant
groundwater source adjustments. These adjustments include increases of 12% for
storage, 30% for source and 40% for booster station capacities, respectively.
The projected cost for the TOM to design, bid, and construct the required facilities to
serve an equivalent residential dwelling unit including a 20% allocation for engineering
and contingencies is listed as follows:
3.3 Cost Criteria:
Storage Capacity (Welded Steel) = ($0.70/gal)
Storage Capacity (Concrete) = ($1.20/gal)
Source(Well) Capacity = ($450,000)/(1000 gpm)
(Assumes 1000 gpm capacity)
Booster Capacity = ($350,000)/(1000 gpm)
(Assumes 1000 allocation to FF)
Large Capacity or Double Zone Booster = ($500,000)/(1000 gpm)
(Assumes 1000 allocation to FF)
= $.70/gallon
= $1.20/gallon
= $450/gpm
= $350/gpm
=$500/gpm
Based upon the calculations and projected costs as listed above, the required capital contribution
for the EDU as listed above is determined as follows:
EDU Fee
= Storage Capacity +Source Capacity + Booster Capacity =
Storage (Welded Steel) = 490 gal/EDU x $0.70 gal
Well = 0.63 gpm/EDU x $450/gpm
Booster = 0.68 gpm/EDU x $350/gpm
=
$343.00/EDU
$283.50/EDU
$238.00/EDU
$864.50/EDU
=
4.0 Projected Infrastructure Fee
Based upon the criteria developed herein, it is recommended the TMWS implement a minimum
non-participating connection fee of $864.50 per EDU to all new developments not constructing
facility infrastructure improvements.
Meter SiLl' ED1 Inrnl'oitrul'ture
(inchcs) H.atio Fcc
518 x 3/4 1.0 $864
3/4 1.2 $1,036
1 2.5 $2,160
1.5 5.0 $4,320
2 8.0 $6,912
3 15.0 $12,960
4 25.0 $21,600
6 50.0 $43,200
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PROPOSAL FOR TOWN OF MARANA
GRAVAITY STORAGE AND RENEWABLE
WATER RESOURCE FEE
PROPOSAL FOR TOWN OF MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
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TABLE OF CONTENTS
1.0 INTRODUCTION..................................................................................................................................1
2.0 POPULATION AND DEMAND PROJECTIONS................................................................................2
3.0 ALTERNATNE SOURCE WATER REQUIREMENTS ....................................................................3
4.0 EXISTING SYSTEM EVALUATION ..................................................................................................4
5.0 INFRASTRUCTURE REQUIREMENTS AND COST OPINIONS ....................................................5
6.0 IMPACT FEE CALCULATION ........................................................................................................... 7
LIST OF TABLES
Table I. Costs for Water Right Acquisition and System Improvements...................................................... 7
Table 2. Proposed MGSRWRF Fee Schedule.............................................................................................. 7
LIST OF FIGURES
Figure 1. Planning Area
Figure 2. MGSRWRF Proposed Treatment, Distribution and Gravity Storage Infrastructure
LIST OF APPENDICES
Appendix A. Town of Maran a Demand and Effluent Projections
Appendix B. Town of Maran a Potable Water Master Plan Chapter - Revised 2005
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TOC
PROPOSAL FOR TOWN OF MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
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1.0 INTRODUCTION
The Town of Marana (TOM) and its Municipal Water System have experienced substantial growth in the
last few years. At the end of the 2004 calendar year, the Town of Marana Municipal Water System
(TMWS) had a total of 3,069 potable water connections. This is an increase in customer base of
approximately 45% over the previous calendar year. Based upon current and projected growth rates, the
TMWS will increase in overall size by approximately 30 times that of its existing customer base. The
projected growth of the TOM will challenge the TMWS to responsibly accommodate the growth of its
water system.
The purpose of the Town of Marana Gravity Storage and Renewable Water Resource Fee (MGSRWRF)
is to place the cost burden of future growth on the future development it is required to serve. Two cost
components are identified in the proposed fee. The first component is the projected capital cost for the
acquisition of the water rights required for the TOM to be self sufficient in complying with the
replenishment obligations currently required by the Arizona Department of Water Resources (ADWR).
Costs estimates and acquisition assumptions are made to project the present value acquisition cost for the
water rights required to accommodate the buildout demand projections.
The second cost component is the cumulative cost for water system infrastructure to integrate new water
supplies into the proposed water system. The additional infrastructure is required to accommodate the
necessary changes in water system operation resulting from the large projected increase in the size of the
system. This component of the fee is in addition to the cost of initial infrastructure improvements,
including wells, reservoirs, booster stations, and pipelines initially required to produce and deliver water
to new development.
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PROPOSAL FOR TOWN OF MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
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2.0 POPULATION AND DEMAND PROJECTIONS
The planning area for the ultimate service area for the TMWS consists of the current TOM boundary but
removes areas, including Dove Mountain and Continental Ranch, which are currently served by Tucson
Water (Figure I). Details of the methods used to project General Plan detail and the planning area are
identified in Appendix A. Using the dwelling unit densities and land use types indicated in the General
Plan, the data suggests that approximately 65,000 dwelling units and 10,900 acres of commercial
development are likely to be served by the TMWS at buildout.
Table 4-2 of the 2004 Town of Marana Potable Water Master Plan develops a schedule for Equivalent
Dwelling Unit Factors (EDUs) to convert water consumption rates to a standard 5/8-inch by 3/4-inch
water meter. Using these criteria for the future demand projections for the TMWS, it is estimated that
commercial demands within the planning area will be equivalent to approximately 27,000 EDUs, for a
total of approximately 92,000 EDUs for the projected service area.
Based upon 92,000 projected EDUs and consumption rates in compliance with the ADWR's conservation
requirements, the total potable water demand projected for the planning area is estimated to be
approximately 30,000 acre-feet per year. The non-potable demand for the areas currently deemed for
non-potable service is approximately 3,700 acre-feet per year.
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PROPOSAL FOR TOWN OF MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
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3.0 ALTERNATIVE SOURCE WATER REQUIREMENTS
The 1980 Groundwater Management Act created the ADWR to ensure that water supplies are adequate to
meet the long-term needs of new development. The Assured Water Supply (A WS) Program developed by
ADWR requires the demonstration that sufficient water supplies of adequate quality are physically,
continuously, and legally available for 100 years. In an Active Management Area (AMA), anyone who
offers subdivided land for sale must demonstrate an assured supply of water to ADWR before the land
may be marketed to the public. The TMWS has received a Designation of A WS from ADWR that
provides prospective development within the TOM's service area a 100-year A WS. The developer for the
subdivision is only required to obtain a written commitment of service from the TMWS.
For the TMWS to meet its A WS requirements as a "designated" provider, it is required to limit
dependency on groundwater and increase its use of renewable water supplies such as treated effluent and
Central Arizona Project (CAP) water. The required amount of groundwater replenishment is based on the
amount of groundwater that has been withdrawn in excess of their allowable groundwater account under
the A WS program. How the TMWS manages its groundwater account will rely greatly upon its effluent
ownership. Currently the TOM is working with the City of Tucson on an Inter-Governmental Agreement
... (IGA), which will allow the TOM to own approximately 13,900 acre-feet per year of effluent based upon
30,000 acre-feet per year of potable deliveries. Assuming that the TMWS will be extremely efficient with
its 13,900 acre-feet per year of effluent, the minimum amount of alternative water required is 33,700 acre-
feet per year (potable and non-potable deliveries) minus 13,900 acre-feet per year (effluent ownership) for
a total of approximately 20,000 acre-feet per year of renewable water required to meet the ADWR
replenishment obligation in a self sufficient manner.
In the desert southwest there are very few commodities that have a higher value than water resources.
The TOM is currently in the process of acquiring approximately 1500 acre-feet per year of excess CAP
water rights from the Flowing Wells Irrigation District (FWID). The purchase price for this acquisition is
estimated to be $560 per acre-foot. Other water rights the TOM is pursuing are substantially more
expensive, several of which could be up to $3,000 per acre-foot. The total present value cost for the
acquisition of 20,000 acre-feet per year of renewable water is estimated to be approximately $49.5
Million. This projected cost includes a 20% contingency factor to cover cost changes and professional
fees required for the preparation of the documents required for the acquisitions.
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PROPOSAL FOR TOWN OF MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
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4.0 EXISTING SYSTEM EVALUATION
To evaluate the impacts of the components proposed as part or the MGSRWRF on the existing potable
water system, Chapter 4 of the Town of Marana Water Master Plan has been updated to reflect the
number of connections as of the end of calendar year 2004. The revised chapter is included as Appendix
B. The update to the Potable Water Master Plan indicates that there were 3,662 EDUs in the existing
potable water system at the end of calendar year 2004. The master plan update indicates surplus capacity
in most areas. There are four isolated areas where there are minimal deficiencies. All deficiencies are
expected to be corrected by interconnects, pipeline extensions or storage additions within the next few
fiscal years. The water system components and associated facility capacities are summarized as follows:
The existing water system has a storage capacity of 4,470,000 gallons with a storage requirement based
upon Average Daily Demand (ADD) times 1.25 plus fire flow of2,709,210 gallons for a storage surplus
of 1,760,790 gallons.
The existing water system has a source (well) capacity of 13,211 gpm ("Existing Well Capacity," Table
4-4, Updated Potable Water Master Plan, Appendix B) with a source capacity requirement of Peak Daily
Demand (PDD) times a 1.3 well redundancy factor of2,233 gpm (Well Requirement, Table 4-8, Updated
Potable Water Master Plan, Appendix B) for a source surplus of 10,978 gpm.
The existing water system has pumping/booster station capacity to serve PDD plus fire flow or
instantaneous demand in its smaller systems. Currently, there are no areas where Peak Hourly Demand
(PHD) is greater than PDD plus fire flow.
The existing system does not have any known exceedences of Maximum Contaminant Levels (MCLs) as
regulated by the United States Environmental Protection Agency and currently does not, and is not,
required to treat any of its potable water sources.
Page-4
Q:\JObs\SOO's\527.01\Impact Fees\Gravity Impact Fee.doc
PROPOSAL FOR TOWN OF MARANA GRAVTIY STORAGE AND RENEWABLE WATER RESOURCE FEE
~
~
5.0 INFRASTRUCTURE REQUIREMENTS AND COST OPINIONS
The growth of the TOM will change the mode of operation of the existing water system. The smaller
systems currently operated by the TMWS are generally designed to accommodate demands that are
primarily dictated by fire protection requirements. As the system becomes larger, the mode of operation
will change and the summertime domestic peaks will dictate the size of the required infrastructure. In
addition, the TMWS will likely be required to treat and distribute some form of CAP water into its
distribution system. The treatment and conveyance of new source will require additional infrastructure,
including larger transmission mains and additional operational storage capacity to efficiently distribute
water throughout the system. The goal of the infrastructure portion of the MGSRWRF is to define a
treatment and pipeline distribution system to convey approximately 10,000 acre-feet of treated CAP water
throughout the planning area. From this infrastructure system, cost estimates are developed to determine
the associated impact fee.
There are four components that make up the infrastructure requirements for the MGSRWRF. These
components include Potable Water Treatment Facilities, Storage Facilities, Transmission Mains and
Pumping Facilities.
The treatment component of the MGSRWRF is projected to be the TOM's share of a 30,000 acre-foot
CAP treatment facility to be constructed by the TOM, the Metropolitan Domestic Water Improvement
District, FWID, and the Town of Oro Valley. For the purposes of this MGSRWRF analysis, it is
assumed that the initial capital cost for the preferred treatment altemative will be $83.56 million.
Assuming a one-third capital cost allocation to the TOM, the capital component for the treatment
alternative is $33.45 million, which includes 20% contingencies.
It was assumed that the method of treatment would be Slow Sand Filtration (SSF) with Reverse Osmosis
(RO) with either local brine disposal or brine disposal by pipeline to Yuma. The treatment plant capital
cost opinion is from the US Bureau of Reclamation (USBR) report, "Alternatives for Using Central
Arizona Project Water in the Northwest Tucson Area," published August 2000.
,~'--
To accommodate larger summer peak demands, it is recommended that the storage capacity of the
existing system be increased by 25% of ADD to provide additional gravity operational storage for the
proposed water system. This additional storage will allow the more efficient pumping operations while
minimizing the required pumping capacities at high domestic demand periods throughout the summer
months. An additional benefit of gravity storage is the redundancy the system will have in the event of
power failures. The current TMWS policy is to require 125% of ADD for storage capacity. The
MGSRWRF proposes an additional 25% or 6.7 million gallons of storage be added to accommodate the
operational fluctuations of the proposed system. An initial layout of the proposed facilities is depicted on
Q:\Jobs\500's\527.01\Impact Fees\Gravity Impact Fee.doc
Page-5
PROPOSAL FOR TOWN OF MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
~
~
Figure 2. The cost for the construction of the proposed storage facilities is estimated to be $16.8 million,
which includes 20% contingencies.
The proposed gravity system will require that hydraulic grades be maintained throughout the proposed
system. Maintaining these hydraulic grades will require the installation of larger diameter pipelines. The
initial layouts for the proposed pipelines are included on Figure 2. Based upon the hydraulic evaluation,
it is estimated that approximately 90,000 lineal feet of 3~-inch pipeline be installed throughout the
existing system. An additional mile of 16-inch diameter pipelines will also be required to be installed out
of zone to distribute flows in the southwestern portion of the system. The construction cost for the
proposed pipelines is estimated to be $28 million, which includes 20% for contingencies.
The final infrastructure components of the MGSRWRF are the three pumping facilities proposed to
convey treated CAP water throughout the existing system. The proposed locations for said facilities are
depicted in Figure 2. Three booster stations are proposed and the estimated construction cost for the
proposed pumping facilities is $2.7 million, which includes 20% for contingencies.
Q:\Jobs\500's\527.01\Impact Fees\Gravity Impact Fee.doc
Page-6
PROPOSAL FOR TOWN OF MARANA GRAVTIY STORAGE AND RENEWABLE WATER RESOURCE FEE
~
~
6.0 IMPACT FEE CALCULATION
Based upon the evaluation of the future demands and the capacities of the existing potable water system,
the cost of acquiring water rights and system improvements is $132.5 million. Table I shows the
breakdown of costs.
----- -- - --- -- ---
( O"it 10 Illl'l'll''\i''illllg '\l'llO...llo llllllll'
loLl! (0'1-. ddilH'Il(:ll..'''' "i\...ltlll
l'l'l..' ( olIlIHIIll'lIl (1111111011 "il (lIullilllJ S) - - (1Il1l1ioll S)
- -----------
Water Rights 49.5 0.8 48.7
Storage 16.8 16.8
Treatment 33.5 33.5
Pipeline 28.0 28.0
Booster Station 2.7 2.7
Total 130.5 0.8 129.7
T hi 1 C t ~ W t Ri ht A . 'f
d S t I
t
The MGSRWRF is based on the net cost to the future users ($129.7 million) divided by the number of
projected EDUs (92,000) minus the existing EDUs (3,662). To meet these requirements the MGSRWRF
has been determined to be $1,468 per EDU. Table 2 applies the proposed fee by meter size for use in the
collection of the proposed fee.
T bl 2 P
dMGSRWRFF S h d I
,
-- - - - ---- --- -- - ------------ ---
'lcll'J Sill' (IHl'lIl'''i) I,l>l R.llin \I(,SR\\ III hol'
5/8 x 314 1.0 $ 1,468
3/4 1.2 $ 1,762
1 2.5 $ 3,670
1.5 5.0 $ 7,340
2 8.0 $11,744
3 15.0 $22,020
4 25.0 $36,700
6 50.0 $73,400
Q:\JObS\SOO'S\527.01\Impact fees\Gravity Impact Fee.doc
Page-?
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FIGURE 1
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MARANA GRAVITY STORAGE AND RENEWABLE WATER RESOURCE FEE
PLANNING AREA
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APPENDIX A
TOWN OF MARANA
DEMAND AND EFFLUENT PROJECTIONS
MEMORANDUM
TO:
Town of Marana
FROM:
WestLand Resources, Inc.
DATE:
June 29, 2005
CC:
Robert Archer
RE:
TOWN OF MARANA WATER DEMAND AND EFFLUENT PROJECTIONS
WESTLAND PROJECT NO. 527.01 A 8000
INTRODUCTION
This memorandum contains a discussion of projected water demand and the resulting available effluent for the
Town of Marana. Projections are based on the Town of Marana General Plan. Water demand includes
Average Day Demand (ADD), Peak Day Demand (POD), Peak Hour Demand (PHD) for potable water, and
annual water requirements for potable and non-potable water. Effluent projections are based on projected
annual potable water requirements and an Intergovernmental Agreement with the City of Tucson.
WATER DEMAND PROJECTIONS
The projected water demands were based on land use projections from the Town of Marana General Plan. The
planning area for this study is a portion of the area covered by the General Plan and is shown in Figure I. The
planning area is subdivided into areas that will receive non-potable water (in addition to potable water), and
areas that will not receive non-potable water. These areas are further subdivided into water pressure zones.
Projected water demand was based on a GIS analysis that combined information from the Town of Marana
General Plan, topography, and other planning data. The General Plan and Town of Maran a Town Limits were
provided by the Town of Marana in shapefile format (gp02 _landuse _ 05.shp, maranalim.shp). Topography,
and Water Service Area boundaries are from the Pima County Land Information System, Verision 25.0
(PCLlS). Water Pressure Zones are based on topography; however, the zone boundaries do not follow the
contours exactly.
The planning area was constructed by clipping the general plan to the existing Town boundary and removing
areas served by other water companies, Saguaro Ranch, Dove Mountain, and the northeast section of the Town
as shown in Figure 1. For this study, it was assumed that the portion of the planning area north of Tangerine
Road would be provided with non-potable water in addition to potable water. The area to be supplied with non-
potable water is shown in Figure l.
GIS software was used to intersect the General Plan, pressure zones, and non-potable area (Figure 2).
Attributes attached to the resulting polygons included area, land use, water pressure zone, and whether or not
- the polygon was within the area to be provided with non-potable water. Table I contains a summary of the
calculated areas in acres.
QVobs\500's\52701\lmpact Fees\walu demands rev6-29.05.doc
WestLand Resources, Inc.
Engineering and Environmental Consullenls
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Town of Marana Water Demand and Effluent Projections
June 27, 2005
Page 3
The data area data shown in Table I were used to generate numbers of dwelling units (DU) and quantity of
commercial acres within each zone. The commercial acres are the same as shown in Table 1, with two
exceptions: only 5% of the Alrport Activity Center outside of the non-potable area was counted as commercial
use, and only 50% of the Recreation outside the non-potable area was counted as commercial use. DU was
calculated using the densities shown in Table 2.
Table 2. Dwelling unit density by land use type
General Plan Land Use Catee:orv Dwelling Unitsper Acre
Rural Density Residential 0.1
Mixed Rural 0.5
Low Density Residential 1.5
Medium Density Residential 4.0
High Density Residential 8.1
Master Planning Area 4.0
Table 3 shows the number of dwelling units and quantity of commercial acres by water pressure zone and
availability of non-potable water.
Table 3. Dwelling Units and Commercial Area
Areas with Non-potable Supply Areas without Non- Total
potable Supply
Pressure Dwelling Commercial Dwelling Connnercial Dwelling Commercial
Zone Units Acres Units Acres Units Acres
A 1,042 1,042
B2 1,207 24 1,207 24
C2 549 70 549 70
D2 44 44
W+ 25,673 2,786 267 25,673 3,053
X 7,811 1,494 13,142 4,217 20,953 5,711
Y 11,289 1,534 11,289 1,534
ZI 4,285 4,285
Z2 17 17
Z3 290 290
Z4 462 462
Total 33,484 4,281 31,867 6,573 65,351 10,854
The Average Day Demand (ADD) was calculated for each zone using the DU and commercial acres from
Table 3 and the water use and residence assumptions in Table 4.
Q,Vobs\500's\527.01\lmpaCI Fees\waler demands rev6-29.05doc
WestLand Resources, Inc.
Engineering and Environmental Consultants
Town of Marana Water Demand and Effluent Projections
June 27, 2005
Page 4
Area Supplied with Area Not Supplied with
Nou-potable Water Non-potable Water
Residents Per Unit 2.7
Residential Potable Demand Per Capita (gpcd) 90 125
Commercial Potable Demand Per Acre (gpdJacre) 700 750
Residential Non-Potable Demand Per Capita 35
(gpcd)
Commercial Non-Potable Demand Per Acre 50
(gpcd)
Table 4. Average Day Demand Assumptions
Table 5 shows tbe potable ADD by water pressure zone. It was assumed that the Peak Day Demand (PDD) will
be 2.0 times the ADD, and that the Peak Hour Demand will be 3.5 times the ADD. The projected potable
ADD is about 26.8 MGD, which is equivalent to about 79,450 EDU.
Table 5. Summarv of Potable Water Demaud bv Zone
Avera!'e Dav Demand (MGD) Total POD PHD
Area wi Non-potable Area wlo Non-potable ADD
Residential Commercial Total Residential Commercial Total MGD (gpm) (gpm)
A 0.35 0.35 0.35 488 855
B2 0.41 0.02 0.41 0.41 566 990
C2 0.19 0.05 0.19 0.19 257 450
D2 0.02 0.02 0.02 21 36
w+ 11,65 20,39
6.24 1.95 8.19 0.20 0.20 8.39 1 0
X 14,64 25,62
1.90 1.05 2.94 4.44 3.16 7.60 10.54 2 3
Y 12,05
3.81 1.15 4.96 4.96 6,890 7
Zl 1.45 1.45 1.45 2,009 3,515
Z2 0.01 0.01 0.01 8 14
Z3 0.10 0.10 0.10 136 238
Z4 0.35 0.35 0.35 481 842
Tota 37,24 65,17
I 8.14 3.00 11.13 10.75 4.93 15.68 26.82 3 5
Data from Tables 4, 5, and 6 can be used to calculate EDUs based on the projected water demand. The
equivalent EDU's for the commercial areas must be calculated separately for the area supplied with non-
potable and water and the area not supplied with non-potable water. In the area supplied with non-potable
water each EDU equates to 243 gpd (90 gpcd times 2.7 personsldwelling unit); in the remaining area each
EDU equates to 337.5 gpd (125 gpcd times 2.7 persons Idwelling unit). In the area supplied with non-potable
water there are 12,332 commercial EDU's based on an ADD of 3.0 MOD. In the remaining area there are
Q\Jobs\500's\52701\lmpactFees\walerdemandsrev6_29_05doc
WestLand Resources, Inc.
Engineering and Environmental Consultants
Town of Marana Water Demand and Effluent Projections
June 27, 2005
Page 5
14,607 commercial EDUs based on an ADD of 4.9 MGD. The total number of commercial EDUs is 26,939.
The total number of commercial and residential EDU's is 92,290, which includes the 65,351 residential EDUs
shown in Table 3.
Table 6 shows the non-potable water demand by zone. The projected non-potable ADD is 3.4 MGD.
Table 6. Summarv of Non-notable Water Demand bv Zone
Water ADDIMGDl
Pressure
Zone Residential Commercial Total
W+ 2.43 0.14 2.57
X 0.74 0.08 0.81
Total 3.16 0.21 3.38
Table 7 is a summary of annual water demand for potable and non-potable. The total projected annual water
demand is about 33,850 acre-feet.
Source
Potable
Non-Potable
Total
Table 7. Summarv of Proiected Annual Demand
Annnal Demand
(acre-feet)
30,065
3,787
33,853
EFFLUENT PROJECTIONS
The Town of Marana is working with the City of Tucson on an Intergovernmental Agreement (lGA) for the
right to effluent water derived from the Town's potable water delivery. The quantity of effluent assigned to the
Town is a portion of the quantity of potable water delivered to customers in the previous year based on
formulas in the IGA. Table 8 shows the projected effluent available to the Town given the potable water
demand from Table 7 and the assumptions in Table 8. The projected quantity of effluent available is 13,906
acre-feet.
QcIJobs\500's\52701\lmpact Feeslwatel' demands rev6-29_05.d oc
WestLand Resources, Inc.
Engineering and Environmental Consultants
Town of Marana Water Demand and Effluent Projections
June 27, 2005
Page 6
Table 8. Effluent Projection a culations
Variable Description
Name (AF = acre-feeO Value Notes
Q Marana Potable Water Deliveries (AF) 30,065 Table 7
F Effluent Generation Factor 0.7 Assumed agreement between
City of Tucson and Town of
Marana
W Marana Wastewater Generated (AF) 21,046 QxF
E Total Effluent Discharged from WWTP's 150,000
(AF)
1 Total inflow received bv WWTP's (AF) 157,895
L Ratio ofWWTP effluent to WWTP influent. 0.985 Ell
OGAE Effluent derived from Marana '$ wastewater 20,730 Wx I
(AF)
S SA WRSA Effluent Entitlement (AF) 28,200 SA WRSA, 1983
OS Marana's contribution to SA WRSA (AF) 3,897 W/ExS
CEP Conservation Effluent Pool (AF) 10,000
OCEP Marana's contribution to CEP (AF) 1,382 W/E x CEP
OPE Marana's contribution to Pima County's 1,545 0.1 x (E - S - CEP) x OGAE/E
share of effluent
OE Effluent available to Marana 13,906 OGAE - OS - OCEP - OPE
CI
QcIJobs\500's\521 01\lmpact Feeslwater demands rev6.29-05doc
WestLand Resources, Inc.
Engineering and Environmental Consultants
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FIGURE 1
TOWN OF MARANA
MARANA MUNICIPAL WATER SYSTEM
WATER DEMAND AND EFFLUENT PROJECTIONS
PLANNING AREA
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Legend
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AREA WITHOUT NON-POTABLE SUPPLY
TOTAL
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65,351
COMMERCIAL
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~
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FIGURE 2
TOWN OF MARANA
MARANA MUNICIPAL WATER SYSTEM
WATER DEMAND AND EFFLUENT PROJECTIONS
PROJECTED LAND USE
Westland Rcsolll"CeS, Inc.
Eog\'1Nrlng<n:lE"'lr_Contullon~
~
~
APPENDIX B
TOWN OF MARAN A
POTABLE WATER MASTER PLAN
CHAPTER 4 - REVISED 2005
TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
~
~
TABLE OF CONTENTS
CHAPTER 4 - EXISTING SYSTEM ANAL YSIS.......................................................................................1
4.1 Existing Water System.......................................................................................................................1
4.1.1. Existing Groundwater Well Capacity Summary .......................................................................4
4.1.2. Existing Reservoir and Booster Station Capacity Summary .....................................................4
4.2. Existing System design criteria......................................................................................................... 7
4.2.1. Demand...................................................................................................................................... 7
4.2.2. Supply ........................................................................................................................................ 8
4.2.3. Storage....................................................................................................................................... 8
4.2.4. Distribution System................................................................................................................... 8
4.3. Existing System Demands ................................................................................................................ 8
4.4. Existing System Requirements .........................................................................................................9
4.4.1. Wells .......................................................................................................................................... 9
4.4.2. Storage..................................................................................................................................... 1 0
4.5. Existing System Capital Improvement Recommendations............................................................. 11
4.5.1. Cortaro RanchlOsbrin Area .....................................................................................................12
4.5 .2. Airline/Lambert System........................................................................................................... 12
4.5.3. La Puerta.................................................................................................................................. 12
4.5.4. Palo Verde.............................................................................................................................. .12
LIST OF TABLES
Table 4.1. Connections Summary ................................................................................................................1
Table 4.2. Equivalent Dwelling Unit Meter Factors ....................................................................................2
Table 4.3. TMWS Pressure Zone Boundaries .............................................................................................. 3
Table 4.4. Existing Well Summary ..............................................................................................................4
Table 4.5. Existing Reservoir Summary ......................................................................................................5
Table 4.6. Existing Booster Station Summary .............................................................................................6
Table 4.7. Existing Service Area Capacity Summary ..................................................................................7
Table 4.8. Existing Water Usage Summary .................................................................................................9
Table 4.9. Existing Well Capacity Requirements ......................................................................................10
Table 4.10. Existing Reservoir Capacity Requirements.............................................................................11
Q:\,Jobs\500's\527.01\Impact Fees\Chaptef' 4 - ExIsting system Analysis Update 200S.doc
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
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CHAPTER 4 - EXISTING SYSTEM ANALYSIS
4.1 EXISTING WATER SYSTEM
The existing TMWS serves a population of approximately 9,886 people, within its nine water service
areas (Exhibit I). Existing water service areas are North Marana, Picture Rocks/Continental
Reserve/Springs, Oshrin/Cortaro, AirlinelLambert, La Puerta, Palo Verde, Hartman Vistas, Airport, and
Falstaff Flats. A summary of connections within the service areas of the TMWS for ending calendar year
2004 is shown in Table 4-1, Connections Summary.
TABLE 4-1. Connections Summary
-- -~ - --- - - - - -- -- - -- - - -- - -- -- - - -
( akul.ltcd
""iel' il'(, \1 e.1 'Ii.,ter ( nllllt.'l'liOIl~ I tllll\.lli..'llll)"dling Inih I "'1;lII,lfl'd Puplll.Jtiol1 SCt, l'lI
North Marana 914 1,211 3,270
Picture Rocks/ Continental
Reserve/ SnrinQS 1,123 1,321 3,567
Cortaro / Oshrin 401 441 1,189
Airline / Lambert 141 141 381
La Puerta 76 76 205
Palo Verde 55 67 180
Hartman Vistas 341 350 945
Airport 16 50 134
Falstaff Flats 2 6 16
TOTALS 3,069 3,662 9,886
Equivalent dwelling units (EDUs) are an industry method used to estimate and convert water
consumption rates to a standard 5/8-inch x 3/4-inch water meter. The ratios shown are taken from the
American Water Works Association (AWWA) M-26 Manual for meter sizes up to 3-inch. The 4 and 6-
inch ratios are representative of similar meter factors used by other local municipalities and have been
accepted by the Arizona Corporation Commission (ACe) for private water providers. Table 4-2 shows
the equivalent dwelling unit ratios and their associated meter factors.
Q:\JObs\500'S\527.01\Impact Fees\Chapter 4 - Existing System AnalysiS Update ZooS.doc
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
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TABLE 4-2. Equivalent Dwelling Unit Meter Factors
'Idel" Sill' (indH.'s) I' III R.llin
5/8 x 314 1.0
314 1.2
1 2.5
1-1/2 5.0
2 8.0
3 15.0
4 25.0
6 50.0
Each individual service area is separated into pressure zones that are established based on elevations.
Some TMWS pressure zone delineations are consistent with those in use by adjacent municipal providers,
others were inherited from other water service providers. The zone boundaries are established at 100- or
105-foot elevation differences; elevations are shown in Table 4-3, and the zone boundaries are shown on
Exhibit I. Each water service area is served by or is planned to be served by one or more of the following
methods:
. direct connection of wells in the zone,
. booster stations pumping from storage, or
. booster stations and wells pumping to a storage reservoir.
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
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TABLE 4-3. TMWS Pressure Zone Boundaries
- - - -- - - - - -- -- -- -- - - -
\\ l'r.lgl' S('nitT l<qui\.IIl'1I1
St'l \Il'l' I .Hllit~ Sill' Sl'nill' Iln.lliHII I \\ IOIH'
\ll'.1 DdIH'I' 1.IUIlI' I h.'\.ltlllll 11~1I\\.I~I_ Bound.lrk.... Hilum!." ~
-- -- - -- - - -
Picture Picture Rocks 2334 2493 2393-2293 N/A
Rocks Booster
Springs Springs Booster 2177 2298 2101-2206 y
Picture Continental
Rocks Reserve to Picture 2180 2358 2258-2158 N/A
Rocks
Continental Continental 2136 2316 2216-2116 N/A
Reserve Reserve Booster
La Puerta La Puerta Booster 2096 2240 2140-2040 N/A
Palo Verde Palo Verde 2009 2141 2041-1941 N/A
Booster
North Marana Park 1995 2125 2025-1925 N/A
Marana Booster
North Honea East 1991 2125 2025-1925 N/A
Marana Booster
North Honea West 1980 2125 2025-1925 N/A
Marana Booster
North Amole Booster 1995 2125 2025-1925 N/A
Marana
Cortaml Cortaro Ranch 2180 2318 2218-2118 N/A
asbrin Booster
Cortaml Osbrin Park 2180 2318 2218-2118 N/A
Osbrin Booster
Hartman Hartman Vistas 2274 2403 2303-2203 Z
Vistas Booster
Airport Airport Booster 2010 2150 2050-1950 N/A
North
Airport Airport Booster 2020 2180 2080-1980 N/A
South
Airlinel Airline Booster 2072 2220 2120-2020 N/A
Lambert
Airlinel Lambert Booster 2077 2220 2120-2020 N/A
Lambert
Falstaff Falstaff Booster 2070 2206 2106-2006 N/A
Currently, all service areas within the TMWS are pressure controlled, with all reservoirs being fed
directly by wells or booster stations. Gravity storage is currently not provided directly in any of the
TOM's service areas.
Figures 1-9 show the existing service areas and summarizes the existing system infrastructure, demands,
and requirements.
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4.1.1. Existing Groundwater Well Capacity Summary
The TMWS currently delivers groundwater from 21 production wells. Table 4-4, Existing Well
Summary, provides a summary of the well capacity, the service area served by the well, and the
approximate elevation of the well site. Source water is delivered to the system through a system of
booster stations and reservoirs.
,
--- --- -- --- - --- -- -- -----
\ppl fl\IIlI,IIi..' (,round
( .lp.llil' \\ ,lIlT Sll' Ill' \1l'.1 SUll.lll'
\\ dl \.IIlIl' (~plll) St'l \l'tl I h.'\:llIOII (kt'l) \II\\RII ,,-
- --- - - - - - -- - -
Well 33.1 (Honea West) 253 North Marana 1990 632634
Well 33.2 (Honea East) 255 North Marana 1990 632633
Well 28.2 (Sandario) 575 North Marana 1990 604844
Gladden Farms 1,800 North Marana
Well 34.1 (Picture Rocks) 200 Picture Rocksl Continental 2120 613599
Reservel Springs
Well 28.1 (Continental 1,750 Picture Rocksl Continental 2136 578734
Reserve) Reservel SpringS
Well 26.1 (Osbrin) 225 Cortara I Oshrin 2170 604846
Well 26.2 (Cortaro East) 500 Cortara I asbrin 2180 603548
Well 26.3 (Cortara West) 500 Cortaro I ashrin 603549
Well 7.1 (Lambert) 129 Airline Lambert 2070 605214
Well 7.2 (Airline) 125 Airline Lambert 2070 605215
Well 17.14 800 La Pnerta 2077 604832
Well 17.1 200 Palo Verde 2010 606675
Well 17.12 (High Nitrates) 60' Palo Verde 2010 587820
Well 15.1 1,150 Hartman Vistas 2119 587027
Well 4.1 2,500 Airport 582677
Well 10.1 1,800 Airport 2110 582676
(55-604339) Jnrop Center 55 Airport 2115 604339
(55-531335) Airport 35 Airport 2030 531335
Well 8.1 59 Falstaff Flats 604845
Well 36.1 50 Operations center 601245
Well 27.1 250 a.M.H. Park well 1998 604340
Total 13,211 - - -
TABLE 4 4 E . f W II S
· Not included in the Total
4.1.2. Existing Reservoir and Booster Station Capacity Summary
The capacities and elevations of reservoirs and booster stations within the TMWS are summarized in
Table 4-5, Existing Reservoir Summary, and Table 4-6, Existing Booster Station Summary. The well,
reservoir, and booster station capacities specifically serving each service area are summarized in Table 4-
7, Existing Service Area Capacity Summary.
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TABLE 4-5. Existing Reservoir Snmmary
North Marana
North Marana
North Marana
Picture Picture Rocks/ Continental
Rocks 2334 24 100,000 (2358) Reserve/ Springs
Continental Picture Rocks/ Continental
Reserve 2136 24 1,000,000 (2160) Reserve/ S rin s
Picture Rocks/ Continental
Srins 2177 16 1,000,000 2193) Reserve/ S rin s
Osbrin 2180 16 10,000 (2196) Cortaro / Osbrin
Oshrin 2180 16 25,000 (2196) Cortaro / Oshrin
Cortaro 2180 16 150,000 (2196) Cortaro / Osbrin
Ranch West
Lambert 2077 16 30,000 2093 Airline / Lambert
Airline 2072 8 20,000 2080) Airline / Lambert
La Puerta 2096 28 20,000 (2124) La Puerta
Palo Verde 2009 24 25,000 (2033) Palo Verde
Hartman 2274 24 500,000 (2298)" Hartman Vistas
Vistas
Airport 2010 24 500,000 (2034) Airport (FF Only)
North
Airport 2020 10 5,000 (2030) Airport
South
Falstaff 2070 8 10,000 (2078) Falstaff Flats
Flats
Total 4,470,000
* Will float the Y -zone in the future.
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Honea West 550 North Marana 1980
Honea East 720 North Marana 1991
Sandario 1,000 North Marana 1990
Marana Park 2,000 North Marana 1995
Picture Rocks 400 Picture Rocks/ Continental 2334
Reserve/ S rin s
Continental Reserve 1,800 Picture Rocks/ Continental 2136
Reserve/ S rin s
Continental Reserve 600 Picture Rocks/ Continental 2180
to Picture Rocks Reserve/ S rin s
Springs 3,100 Picture Rocks/ Continental 2177
Reserve/ S rin s
Oshrin 350 Cortara / Oshrin 2180
Cortara Ranch 1,750 Cortara / Oshrin 2180
Lambert 1,750 Airline Lambert 2077
Airline 230 Airline Lambert 2072
La Puerta 1,200 La Puerta 2096
Palo Verde 400 Palo Verde 2009
Hartman Vistas 1,300 Hartman Vistas 2274
Ai art 4,500 A' art 2010
The main service areas serving the majority of the population within the water system are North Marana,
Picture Rocks/Continental Reserve/Springs, and Cortaro/Oshrin. These service areas will require
expansion to serve the remainder of the water system within the future planning area. The remaining
service areas will typically grow to capacity by population inlill within their existing boundaries or be
combined with a main service area.
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TABLE 4-7. Existing Service Area Capacity Summary
-- - ~ - -- --- - -- -- - - - -
rot.11 "<'II BOU....tl'l
( ,q).Il'll\ ( .lp.llll\ StOl ,I~l'
\\ :lll'l Sl'n il.'l' \11..'.1 (';!.~m} (v,pm} (l.?.lllul~"')
-- -- - - - --
North Marana 2,883 4,270 1,075,000
Picture Rocks/Continental
Reserve/Springs 1,950 Varies bv zone 2,100,000
Cortaro/Osbrin 1,225 2,100 185,000
Airline/Lambert 254 1,980 50,000
La Puerta 800 1,200 20,000
Palo Verde 260 400 25,000
Hartman Vistas 1,150 1,300 500,000
Airoort 4,390 4,500 505,000
Falstaff Flats 59 0 10,000
Totals 12,971 15,750 4,470,000
4.2. EXISTING SYSTEM DESIGN CRITERIA
The existing system is served entirely by groundwater wells. As a design goal, the groundwater wells
shall provide sufficient capacity to meet the PDD with the largest well out of service. Reservoirs shall be
able to accommodate hourly fluctuations and demand for fire flow in the zone they serve. Supply for the
service areas is conveyed to the reservoirs as it is produced from wells, then boosted to the zone high-
water elevation at the peak-day rate.
The design criteria for reservoirs is to provide a usable storage volume for the service area served
equaling 125 percent of the ADD, plus the demand required for fire flow. The existing transmission and
distribution systems should be sized and arranged to minimize friction-generated line losses and provide
the required fire flows.
Current system design criteria for the TMWS water system are described below, in terms of demand,
supply, storage, and distribution system assumptions.
4.2.1. Demand
Demand flow and population estimates are based on TMWS water system estimated water use data and
existing parcel connection information.
. Average daily per capita water usage for equivalent dwelling units .........................125 apeD
. Average number of persons per single-family dwelling unil..................................................2.7
. Ratio of peak day to average day ............................................................................................ 2.0
. Ratio of peak hour to average day ..........................................................................................3.5
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4.2.2. Supply
The criteria for the evaluation of supply projections to each individual service area is listed as follows:
. Well capacity to meet PDD with the largest well out of service.
· Minimum supply from well and boosters pumping to elevated storage shall meet PDD.
. Minimum booster capacity to service areas without elevated storage shall meet peak hour demand or
PDD plus fire flow, whichever is greater.
4.2.3. Storage
The criteria for storage capacity requirements for the water system is based upon the following:
. Provide storage volume equal to a minimum of 1.25 times the ADD.
· Provide additional storage volume required to provide fire flow for appropriate durations.
4.2.4. Distribution System
Pipeline design within the distribution system is based upon the following criteria:
. System design and construction to meet A WW A and ADEQ requirements.
· Transmission lines serving PDD only shall be designed for a maximum velocity of 5 feet per second
(ftlsec) with a minimum pressure of35 psi. Transmission lines serving PDD plus fire flow shall have
a maximum velocity of 10 ft/sec and a minimum pressure of20 psi.
· Maximum friction head loss for lines up to and including 8 inches in size is to be 8 feet per 1,000 feet
or less. Head loss for lines between 8 and 10 inches in size is to be 5 feet per 1,000 feet or less,
according to pipe size. Head loss for lines 12 inches and larger in size is to be 4 feet per 1,000 feet or
less.
· Distribution lines to be sized and arranged to provide required fire flows.
4.3. EXISTING SYSTEM DEMANDS
The existing water system, as shown in Exhibit I is divided into nine separate service areas. The
boundaries of the existing service areas are also provided on Exhibit I.
~.
Table 4-8, Existing Water Usage Summary, estimates the ADD, PDD, and PHD for each service area
within the TMWS.
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-- --- - --- --- - --- ---- - -- -
.' \i...lill~
I qui\.lknt \\l'1 .1J.!,l' 1),11" Pl"II... D.li" Pl'.II,llollr
\\ atl'r Sl'I' in' \ll'.1 Ih\('lIi~IJ!._( nit... Ih'IlI.II~d JgpllI) - Ih'1I1.IIHUgIJIII) E~1.1I1d (g~~~
-- --- - -- -
North Marana 1,211 284 568 993
Picture Rocks/Continental
Reserve/Springs 1,321 310 619 1,084
Cortara/Osbrin 441 103 207 362
Airline Lambert 141 33 66 116
La Puerta 76 18 36 62
Palo Verde 67 16 31 55
Hartman Vistas 350 82 164 287
Airport 50 12 23 41
Falstaff Flats 6 2 4 7
TOTAL 3,662 859 1,718 3,007
TABLE 4-8. Existing Water Usage Summary
Water system usage demand calculation examples are based on the previous design criteria and are as
follows:
Equivalent Dwelling Unit (EDU) Usage
ADD = 2.7 persons/unit x 125 GPCD/l,440 = 0.234 gpm/EDU
PDD = ADD x 2.0 = 0.243 x 2.0 = 0.469 gpm/EDU
PHD = ADD x 3.5 = 0.851 x 3.5 = 0.82 gpm/EDU
4.4. EXISTING SYSTEM REQUIREMENTS
The water system design criteria as previously provided was used to develop the existing capacity
upgrade requirements for the TMWS. Existing system requirements include the capacity upgrades
needed for wells and storage to serve all existing connected parcels.
4.4.1. Wells
Well production requirements are based on meeting PDD with the largest well out of service. A summary
of the existing well capacities and the additional well capacity required is presented in Table 4-9, Existing
Well Capacity Requirements. As shown in Table 4-9, overall the TMWS exceeds the PDD well
requirement of 1,782 gpm, as existing well capacity is 12,971 gpm.
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TABLE 4-9. Existing Well Capacity Reqnirements
- ~ ~ ~ -- -- - -- - -- - - - - - - ---
" ell
Ri.'qUlll'IIH.'1l1 ~ \l'.tlJl~ "('II ~IHJlI.Il!.l' \\ dl I H'l'''i\ \\ dl
"dll'r St.'I' h.'(' \1 ('.1 i!~DI>-Fl!1J1) (_~p.ll'I~\ (~pJJJ) _~ ap.~l~l\ (l.!I~l) - ( :~ldl.\JgJlIll)_
-- - - - -
North Marana 589 2,883 494
Picture Rocks/ Continental
Reserve/ Springs 642 1,950 1,308
Cortaro/Oshrin 214 1,225 511
Airline Lambert 69 254 55
(0) no redundant
La Puerta 37 800 well capacitv
Palo Verde 33 260 27
Hartman Vistas 170 1,150 980
Airport 24 4,390 1,866
(0) no redundant
Falstaff Flats 4 59 well canacitv
Totals 1,782 12,971 5,241
* Assumes largest wen out of service or emergency interconnect.
4.4.2. Storage
Storage sizing requirements are based on meeting 1.25 times the ADD plus fire flow. The fire flow
requirement for the North Marana and Cortaro/Oshrin service areas is 1,500 gpm for two hours. The fire
flow requirements for the Picture Rocks/Continental Reserve/Springs and Airport service areas are 2,500
gpm and 2,750 gpm for two hours, respectively. Fire flow requirements to the Hartman Vistas and La
Puerta service areas is 1,000 gpm for two hours. The fire flow requirement for the Palo Verde and
Airline/Lambert service areas is 300 gpm for two hours. The storage requirements by service area are
presented in Table 4-10, Existing Reservoir Capacity Requirements.
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0...'0'
TABLE 4-10. Existing Reservoir Capacity Reqnirements
- -- -- -- -- - --- -- -- - - -- -- - --
Pnt.thlc
S!ill ,I~l Illl'llo\\ 101.11 "iIHl/I.I!..(l'
I{U!UilCl\llllt ~l(ll.\\.!,( StOl,I'.!.1.. I \.I...til\~ StOI.l~l' I: \ll....'
\\ .Illl S('I \ III (I 2'::; \1)1) Rl'llllltllllll1t Rl'qllltl'IlH III "illll.l!.!.l ( .1!l.ldl\ Slm,l!..:l'
\1(',\ U,111 ('..!..11l (~'Il -- ( .\p.~\:It\ \~.\Il _jJ.!,.I\) - (.lp.l~' (12..11)_
-- - - -
North Marana 529,200 180,000 709,200 1,075,000 365,800
Picture Rocks/
Continental 577,800 300,000 877,800 2, I 00,000 1,222,200
Reserve/
Sprin~s
Cortaro / Oshrin 192,600 180,000 372,600 185,000 187,600
Airline Lambert 61,200 N/A 61,200 50,000 11 ,200
La Puerta 32,400 N/A 32,400 20,000 12,400
Palo Verde 28,800 N/A 28,800 25,000 3,800
Hartman Vistas 153,000 120,000 273,000 500,000 227,000
Airoort 21,600 330,000 351,600 505,000 153,400
Falstaff Flats 2,610 N/A 2,610 10,000 7,390
Totals 1,599,211 1,110,000 2,709,210 4,470,000
According to Table 4-10, the TMWS requires an additional 385,826 gallons of storage within the
Airline/Lambert, Cortaro/Oshrin, La Puerta, and Palo Verde service areas to meet the 1.25 ADD storage
criteria. The North Marana, Picture Rocks/Continental Reserve/Springs, Falstaff Flats, Airport, and
Hartman Vistas service areas have sufficient storage to meet demands in those zones.
4.5. EXISTING SYSTEM CAPITAL IMPROVEMENT RECOMMENDATIONS
The evaluation of the existing potable water system indicates that the majority of the individual service
areas within the TMWS' area have sufficient well capacity, redundancy or interconnections with adjacent
facilities where the source water capacity is appropriate to serve the existing customers. However, the
evaluation of storage capacity indicates that there are approximately four areas where existing facilities
either need to be modified or development needs to be connected to provide redundancy to said systems.
The capital improvements recommended are discussed in the following sections.
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4.5.1. Cortaro Ranch/Oshrin Area
The evaluation of the storage capacity for the Cortaro/Oshrin area indicates that this service area is
deficient by approximately 187,600 gallons of storage capacity. Due to the fact that this service area is
ultimately planned to connect to the Hartman service area, which currently has an excess of 227,000
gallons of storage, an interconnection with the Hartman Vistas system, including an 8-inch main
extension and PRV station will provide the redundancy and additional storage capacity needed for fire
protection and other domestic demands, if required. The estimated construction cost for this main
extension is $175,000.
4.5.2. Airline/Lambert System
The evaluation of the Airline/Lambert system indicates that this system is approximately 11 ,200 gallons
short in reservoir capacity. It is our understanding that the design of the AirlineILambert system did not
include fire protection. To upgrade the storage for this service area, it is recommended that an
interconnect with the Saguaro Springs project be provided to supply redundancy and additional source of
water to the AirlineILambert system as future development occurs in the area.
4.5.3. La Puerta
The TMWS has recently modified the La Puerta booster station and well system to provide appropriate
fire protection and source water for the area. However, based upon the condition of the existing reservoir
onsite and the fact that the La Puerta water system with the existing reservoir is approximately 12,400
gallons short of its required capacity. This system also does not have the storage capacity to meet its fire
flow needs; it is recommended that a new 250,000 potable water storage tank be constructed at the La
Puerta site. The estimated cost for said improvements is $175,000.
4.5.4. Palo Verde
The Palo Verde service area is also another small service area that was never initially designed for fire
protection. Although the storage capacity is deficient by approximately 3,800 gallons, a redundant well
has been installed by the TMWS, which reduces the storage requirement with aquifer storage to meet the
minimum ADEQ standards. This, in addition to the fact that the TMWS has installed connections so that
the fire department can pump and haul directly from the existing reservoir in the event of an emergency,
no improvements are recommended for the Palo Verde site. At the end of the effective service life of the
existing reservoir, it is recommended that it be replaced with a 1 OO,OOO-gallon reservoir.
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PROPOSAL FOR WATER SYSTEM
INFRASTRUCTURE IMPACT FEE
PROPOSAL FOR WATER SYSTEM INFRASTRUCTURE IMPACT FEE
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TABLE OF CONTENTS
1.0 OVERVIEW ...........................................................................................................................................1
2.0 EXISTING SYSTEM EV ALUATION ..................................................................................................2
2.1 Storage Capacity................................................................................................................................2
2.2 Source (Well) Capacity......................................................................................................................2
2.3 Pumping Capacity ..............................................................................................................................2
3.0 INFRASTRUCTURE FEE DEVELOPMENT ......................................................................................3
3.1 Demand Criteria................................................................................................................................. 3
3.2 Capacity Calculation Criteria............................................................................................................. 3
3.3 Cost Criteria.......................................................................................................................................3
4.0 PROJECTED INFRASTRUCTURE FEE .............................................................................................5
LIST OF TABLES
Table 1. Infrastructure Fee
LIST OF FIGURES
Figure 1. Infrastructure Fee and MGSRWRF Schematic
LIST OF APPENDICES
Appendix A. Town of Maran a Potable Water Master Plan Chapter 4 - Revised 2005
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PROPOSAL FOR WATER SYSTEM INFRASTRUCTURE IMPACT FEE
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1.0 OVERVIEW
In the summer of 2004, the Town of Marana (TOM) adopted a new Potable Water Master Plan (Master
Plan). The new Master Plan developed policies and procedures for the Town of Marana Municipal Water
System (TMWS) to follow in the implementation of new projects and the management of new
development. The Master Plan completed a comprehensive review of the capacity of the existing potable
water system. The results of this evaluation indicated that the existing system had surplus capacity in the
majority of its existing service areas. This excess capacity was to the existing potable water system.
Chapter 7 - Implementation of the Master Plan, provided a general guideline for the TMWS to use to sell
portions of its excess capacity. The purpose of the Water System Infrastructure Impact Fee (Infrastructure
Fee) is to provide the TMWS with a method to be reimbursed for its excess system capacity.
The Infrastructure Fee is a voluntary fee for the purchase of existing source (well), storage, and booster
station capacity in the existing TMWS. The TMWS proposes to distribute capacity on a first-come, first-
serve basis where available. In the event there is not enough system capacity to serve a development, the
developer will be required to construct its own source (well), storage, and booster station capacity. Ifthe
developer participates in the construction of said facilities, he will not be charged the Infrastructure Fee
for his project. The Infrastructure Fee, as proposed, is for source (well), storage, and booster station
capacity only, and does not include treatment or water mains associated with the connection to the
existing system. The Infrastructure Fee is also separate from the Town of Marana Gravity Storage and
Renewable Water Resource Fee (MGSRWRF). Figure I identifies the components of the both the
Infrastructure Fee as well as the MGSRWRF.
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PROPOSAL FOR WATER SYSTEM INFRASTRUCTURE IMPACT FEE
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2.0 EXISTING SYSTEM EVALUATION
To identifY the surpluses in the existing potable water system, Chapter 4 - Existing System Analysis of
the Potable Water Master Plan has been updated to reflect current connections as of the end of the 2004
calendar year. The revised chapter is included as Appendix A. The update to the Potable Water Master
Plan indicates that there were 3,662 Equivalent Dwelling Unit Factors (EDUs) in the existing potable
water system at the end of calendar year 2004. The master plan update indicates surplus capacity in most
areas. There are four isolated areas where there are minimal deficiencies. All deficiencies are expected
to be corrected by interconnects, pipeline extensions or storage additions within the next few fiscal years.
The water system components and associated facility capacities are summarized in the following sections.
2.1 STORAGE CAPACITY
The existing water system has a storage capacity of 4,470,000 gallons with a storage requirement based
upon Average Daily Demand (ADD) times 1.25 plus fire flow of 2,709,210 gallons for a storage surplus
of 1,760,790 gallons.
2.2 SOURCE (WELL) CAPACITY
The existing water system has a source (well) capacity of 13,211 gpm with a source capacity requirement
of Peak Daily Demand (PDD) times a 1.3 well redundancy factor of 2,233 gpm for a source surplus of
10,978 gpm.
2.3 PUMPING CAPACITY
The existing water system has pumping/booster station capacity to serve PDD plus fire flow or
instantaneous demand in its smaller systems. Currently, there are no areas where Peak Hourly Demand
(PHD) is greater than PDD plus fire flow. Each individual water pressure zone has excess capacity and
will have to be independently evaluated for surplus capacity based upon the fire protection requirements
of future developments.
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3.0 INFRASTRUCTURE FEE DEVELOPMENT
3.1 DEMAND CRITERIA
Per the Marana Potable Water Master Plan, the domestic water demand for a typical 5/8-inch by 3/4-inch
water meter is calculated as follows:
Average Daily Demand (ADD) = (125 gpcd)(2.7 people/unit)
Peak Daily Demand (PDD) = (ADD)(2.0)
Peak Hourly Demand (ADD)(3.5)
= 350 gal/day = 0.24 gpm
= 700 gal/day = 0.48 gpm
= 1225 gal/day = 0.85 gpm
Based upon the latest engineering design standards adopted by the TOM, the required source, storage, and
booster station capacities are calculated in the following section.
3.2 CAPACITY CALCULATION CRITERIA
Storage Capacity = (ADD)(1.25)(1.l2) (Includes 1000 gpm FF capacity) = 490 gal/EDU
Source (Well) Capacity = PDD(1.3)(With largest well out of service) =910gal/EDU*day
Booster Capacity = (PDD)(1.4)(Assumes 1000 gpm FF Capacity) =980 gal/EDU*day
= 0.68 gpm/EDU
The values indicated above include proportional fire flow capacity and redundant groundwater source
adjustments. These adjustments include increases of 12% for storage, 30% for source, and 40% for
booster station capacities.
3.3 COST CRITERIA
The projected cost for the TOM to design, bid, and construct the required facilities to serve an equivalent
residential dwelling unit including a 20% allocation for engineering and contingencies is listed as follows:
Storage Capacity (Welded Steel) = ($0.70/gal)
Storage Capacity (Concrete) = ($1.20/gal)
Source(Well) Capacity = ($450,000)/(1000 gpm)
(Assumes 1000 gpm capacity)
Booster Capacity = ($350,000)/(1000 gpm)
(Assumes 1000 allocation to FF)
Large Capacity or Double Zone Booster = ($500,000)/(1000 gpm)
(Assumes 1000 allocation to FF)
= $.70/gallon
= $1.20/gallon
= $450/gpm
= $350/gpm
=$500/gpm
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PROPOSAL FOR WATER SYSTEM INFRASTRUCTURE IMPACT FEE
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Based upon the calculations and projected costs as listed above, the required capital contribution for the
EOU as listed above is determined as follows:
EOU Fee
= Storage Capacity +Source Capacity + Booster Capacity =
Storage (Welded Steel) = 490 gal/EOU x $0.70 gal
Well 0.63 gpm/EOU x $450/gpm
Booster = 0.68 gpm/EOU x $350/gpm
$343.00/EOU
$283.50/EOU
$238.00/EOU
$864.50/EOU
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PROPOSAL FOR WATER SYSTEM INFRASTRUCTURE IMPACT FEE
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4.0 PROJECTED INFRASTRUCTURE FEE
Based upon the criteria developed herein, it is reconnnended the TMWS implement in Infrastructure Fee
of $864 per EDU to all new developments not constructing facility infrastructure improvements.
Table 1. Infrastructure Fee
---- ---
'It'Il'1 Sill' I III Inlr.I'itrlllll1n'
(11Il'lIl'''') R.llio It,t,
-- --
5/8 x 314 1.0 $864
3/4 1.2 $1,036
1 2.5 $2,160
1.5 5.0 $4,320
2 8.0 $6,912
3 15.0 $12,960
4 25.0 $21,600
6 50.0 $43,200
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APPENDIX A
TOWN OF MARAN A
POTABLE WATER MASTER PLAN
CHAPTER 4 - REVISED 2005
TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
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TABLE OF CONTENTS
CHAPTER 4 - EXISTING SYSTEM ANAL YSIS.......................................................................................1
4.1 Existing Water System....................................................................................................................... 1
4.1.1. Existing Groundwater Well Capacity Summary .......................................................................4
4.1.2. Existing Reservoir and Booster Station Capacity Summary .....................................................4
4.2. Existing System design criteria......................................................................................................... 7
4.2.1. Demand...................................................................................................................................... 7
4.2.2. Supply ........................................................................................................................................8
4.2.3. Storage..................................................................... .,. ............................................................... 8
4.2.4. Distribution System................................................................................................................... 8
4.3. Existing System Demands ................................................................................................................8
4.4. Existing System Requirements .........................................................................................................9
4.4.1. W ells..........................................................................................................................................9
4.4.2. Storage.......................................................................................................................... ........... 1 0
4.5. Existing System Capital Improvement Recommendations.............................................................11
4.5 .1. Cortaro RanchlOsbrin Area .....................................................................................................12
4.5 .2. Airline/Lambert System.......................................................................................................... .12
4.5.3. La Puerta............................................................................................................................... ... 12
4.5.4. Palo Verde........................................................................... ................................................... .12
LIST OF TABLES
Table 4.1. Connections Summary ................................................................................................................ 1
Table 4.2. Equivalent Dwelling Unit Meter Factors ....................................................................................2
Table 4.3. TMWS Pressure Zone Boundaries .............................................................................................. 3
Table 4.4. Existing Well Summary .............................................................................................................. 4
Table 4.5. Existing Reservoir Summary ......................................................................................................5
Table 4.6. Existing Booster Station Summary .............................................................................................6
Table 4.7. Existing Service Area Capacity Summary .................................................................................. 7
Table 4.8. Existing Water Usage Summary .................................................................................................9
Table 4.9. Existing Well Capacity Requirements ......................................................................................10
Table 4.10. Existing Reservoir Capacity Requirements.............................................................................11
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
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CHAPTER 4 - EXISTING SYSTEM ANALYSIS
4.1 EXISTING WATER SYSTEM
The existing TMWS serves a population of approximately 9,886 people, within its nine water service
areas (Exhibit ]). Existing water service areas are North Marana, Picture Rocks/Continenta]
Reserve/Springs, Oshrin/Cortaro, Airline/Lambert, La Puerta, Palo Verde, Hartman Vistas, Airport, and
Fa]staffF]ats. A summary of connections within the service areas of the TMWS for ending calendar year
2004 is shown in Tab]e 4-], Connections Summary.
-- - - --- --- - - ---- -
( .lkul.lll'd
St'l \ il't, \rl'.l \1l'tl'l ( OllIH'l'IWII'i ll(lll\.lIcllt I)\\dlilll!.llllh 1'..,11111.1((>11 PopulatlOlI Sl'I\l'd
North Marana 9]4 ],21 ] 3,270
Picture Rocks/ Continental
Reserve/ SnrinQS ],123 ],321 3,567
Cortaro / Osbrin 40] 44] 1,189
Airline / Lambert ]4] ]4] 381
La Puerta 76 76 205
Palo Verde 55 67 180
Hartman Vistas 34] 350 945
Airport ]6 50 134
Fa]staffF]ats 2 6 16
TOTALS 3,069 3,662 9,886
TABLE 4-1. Connections Summary
Equivalent dwelling units (EDU s) are an industry method used to estimate and convert water
consumption rates to a standard 5/8-inch x 3/4-inch water meter. The ratios shown are taken from the
American Water Works Association (AWWA) M-26 Manua] for meter sizes up to 3-inch. The 4 and 6-
inch ratios are representative of similar meter factors used by other loca] municipalities and have been
accepted by the Arizona Corporation Commission (ACe) for private water providers. Tab]e 4-2 shows
the equivalent dwelling unit ratios and their associated meter factors.
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TABLE 4-2. Equivalent Dwelling Unit Meter Factors
\h'ln Sill' (indll's) 1'111 R.lli..
5/8 x 314 1.0
314 1.2
1 2.5
1-112 5.0
2 8.0
3 15.0
4 25.0
6 50.0
Each individual service area is separated into pressure zones that are established based on elevations.
Some TMWS pressure zone delineations are consistent with those in use by adjacent municipal providers,
others were inherited from other water service providers. The zone boundaries are established at 100- or
lOS-foot elevation differences; elevations are shown in Table 4-3, and the zone boundaries are shown on
Exhibit 1. Each water service area is served by or is planned to be served by one or more of the following
methods:
. direct connection of wells in the zone,
. booster stations pumping from storage, or
. booster stations and wells pumping to a storage reservoir.
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
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- --- --- ---- - ------ --
\\l'I.lgt' St'l,ill' ~(I'Ii\.lklll
Sl'nkl' 1'.IUlil\ Sill' SCI,ire I' It,\ .,llon I" ;I 0 Ill'
\n'.l Iklnl'"I.Il'llil\ Ul'\.ltlOll Illgl~"~l'l Bound.artl'''' Bound.ln
---- ---- - -- --- -
Picture Picture Rocks 2334 2493 2393-2293 N/A
Rocks Booster
Springs Springs Booster 2177 2298 2101-2206 Y
Picture Continental
Reserve to Picture 2180 2358 2258-2158 N/A
Rocks Rocks
Continental Continental 2136 2316 2216-2116 N/A
Reserve Reserve Booster
La Puerta La Puerta Booster 2096 2240 2140-2040 N/A
Palo Verde Palo Verde 2009 2141 2041-1941 N/A
Booster
North Marana Park 1995 2125 2025-1925 N/A
Marana Booster
North Honea East 1991 2125 2025-1925 N/A
Marana Booster
North Honea West 1980 2125 2025-1925 N/A
Marana Booster
North Amole Booster 1995 2125 2025-1925 N/A
Marana
Cortaro/ Cortam Ranch 2180 2318 2218-2118 N/A
Dshrin Booster
Cortam/ Dshrin Park 2180 2318 2218-2118 N/A
Oshrin Booster
Hartman Hartman Vistas 2274 2403 2303-2203 Z
Vistas Booster
Airport Airport Booster 2010 2150 2050-1950 N/A
North
Airport Airport Booster 2020 2180 2080-1980 N/A
South
Airline/ Airline Booster 2072 2220 2120-2020 N/A
Lambert
Airline/ Lambert Booster 2077 2220 2120-2020 N/A
Lambert
Falstaff Falstaff Booster 2070 2206 2106-2006 N/A
TABLE 4-3. TMWS Pressure Zone Boundaries
Currently, all semce areas within the TMWS are pressure controlled, with all reservoirs being fed
directly by wells or booster stations. Gravity storage is currently not provided directly in any of the
TOM's service areas.
Figures 1-9 show the existing service areas and summarizes the existing system infrastructure, demands,
and requirements.
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4.1.1. Existing Groundwater Well Capacity Summary
The TMWS currently delivers groundwater from 21 production wells. Table 4-4, Existing Well
Summary, provides a summary of the well capacity, the service area served by the well, and the
approximate elevation of the well site. Source water is delivered to the system through a system of
booster stations and reservoirs.
-- -- --- - -- -- - -- -- - -- -
\pprO\llll.Jh' (" OlllHI
( 'lIJ.llil\ \\ ,Iti.'r Si.'I' Il't' \n'.l SIIII.IH'
\\i.'1I \.lIlll' (l.:PIlI) St'l \l't! 1< !n.llioll (IL'l'l) \11\\ I{ II 55-
- -- - - - - -- - - -- -- -- -
Well 33.1 (Honea West) 253 North Marana 1990 632634
Well 33.2 (Honea East) 255 North Marana 1990 632633
Well 28.2 (Sandario) 575 North Marana 1990 604844
Gladden Farms 1,800 North Marana
Well 34.1 (Picture Rocks) 200 Picture Rocksl Continental 2120 613599
Reservel Springs
Well 28.1 (Continental 1,750 Picture Rocksl Continental 2136 578734
Reserve) Reservel SPringS
Well 26.1 (Osbrin) 225 Cortaro I asbrin 2170 604846
Well 26.2 (Cortaro East) 500 Cortaro I asbrin 2180 603548
Well 26.3 (Cortaro West) 500 Cortaro I Osbrin 603549
Well 7.1 (Lambert) 129 Airline Lambert 2070 605214
Well 7.2 (Airline) 125 Airline Lambert 2070 605215
Well 17.14 800 La Puerta 2077 604832
Well 17.1 200 Palo Verde 2010 606675
Well 17.12 (High Nitrates) 60' Palo Verde 2010 587820
Well 15.1 1,150 Hartman Vistas 2119 587027
Well 4.1 2,500 Airport 582677
Well 10.1 1,800 Airport 2110 582676
(55-604339) Jump Center 55 Airport 2115 604339
(55-531335) Airport 35 Airport 2030 531335
Well 8.1 59 Falstaff Flats 604845
Well 36.1 50 Operations center 601245
Well 27.1 250 a.M.H. Park well 1998 604340
Total 13,211 - - -
TABLE 4 4 E . f W II S
· Not mcluded m the Total
4.1.2. Existing ReselVoir and Booster Station Capacity Summary
The capacities and elevations of reservoirs and booster stations within the TMWS are summarized in
Table 4-5, Existing Reservoir Summary, and Table 4-6, Existing Booster Station Summary. The well,
reservoir, and booster station capacities specifically serving each service area are summarized in Table 4-
7, Existing Service Area Capacity Summary.
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TABLE 4-5. Existing Reservoir Snmmary
North Marana
North Marana
North Marana
Picture Picture Rocks/ Continental
Rocks 2334 24 100,000 (2358) Reserve/ Springs
Continental Picture Rocks/ Continental
Reserve 2136 24 1,000,000 2160 Reserve/ S rin s
Picture Rocks/ Continental
Srins 2177 16 1,000,000 (2193) Reserve/ S rin s
Oshrin 2180 16 10,000 (2196) Cortaro / Oshrin
Oshrin 2180 16 25,000 (2196) Cortaro / Oshrin
Cortaro 2180 16 150,000 (2196) Cortaro / Oshrin
Ranch West
Lambert 2077 16 30,000 2093 Airline / Lambert
Airline 2072 8 20,000 (2080) Airline / Lambert
La Puerta 2096 28 20,000 (2124) La Puerta
Palo Veyde 2009 24 25,000 (2033) Palo Verde
Hartman 2274 24 500,000 (2298)- Hartman Vistas
Vistas
Airport 2010 24 500,000 (2034) Airport (FF Only)
North
Airport 2020 10 5,000 (2030) Airport
South
Falstaff 2070 8 10,000 (2078) Falstaff Flats
Flats
Total 4,470,000
* wm float the Y -zone in the future.
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Honea West 550 North Marana 1980
Honea East 720 North Marana 1991
Sandario 1,000 North Marana 1990
Marana Park 2,000 North Marana 1995
Picture Rocks 400 Picture Rocks/ Continental 2334
Reserve/ S rin s
Continental Reserve 1,800 Picture Rocks/ Continental 2136
Reserve/ S rin s
Continental Reserve 600 Picture Rocks/ Continental 2180
to Picture Rocks Reserve/ S rin s
Springs 3,100 Piclnre Rocks! Continental 2177
Reserve/ S rin s
Osbrin 350 Cortaro / Osbrin 2180
Cortaro Ranch 1,750 Cortaro / Osbrin 2180
Lambert 1,750 Airline Lambert 2077
Airline 230 Airline Lambert 2072
La Pnerta 1,200 La Puerta 2096
Palo Verde 400 Palo Verde 2009
Hartman Vistas 1,300 Hartman Vistas 2274
A" ort 4,500 A" ort 2010
The main service areas serving the majority of the population within the water system are North Marana,
Picture Rocks/Continental Reserve/Springs, and Cortaro/Oshrin. These service areas will require
expansion to serve the remainder of the water system within the future planning area. The remaining
service areas will typically grow to capacity by population infill within their existing boundaries or be
combined with a main service area.
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TABLE 4-7. Existing Service Area Capacity Snmmary
--
101.11 \\ ell BOO...tl'l
( .lp.ldt\ ( .11l.ll'il\ SIUr.I~l'
\\ atcr St'l \ lei..' \11..'.1 (gplll) (gpll1) (g.ll!oll"')
----- - - ------
North Marana 2,883 4,270 1,075,000
Picture Rocks/Continental
Reserve/Springs 1,950 Varies by zone 2,100,000
Cortaro/Oshrin 1,225 2,100 185,000
Airline/Lambert 254 1,980 50,000
La Puerta 800 1,200 20,000
Palo Verde 260 400 25,000
Hartman Vistas 1,150 1,300 500,000
Airport 4,390 4,500 505,000
Falstaff Flats 59 0 10,000
Totals 12,971 15,750 4,470,000
4.2. EXISTING SYSTEM DESIGN CRITERIA
The existing system is served entirely by groundwater wells. As a design goal, the groundwater wells
shall provide sufficient capacity to meet the POD with the largest well out of service. Reservoirs shall be
able to accommodate hourly fluctuations and demand for fire flow in the zone they serve. Supply for the
service areas is conveyed to the reservoirs as it is produced from wells, then boosted to the zone high-
water elevation at the peak-day rate.
The design criteria for reservoirs is to provide a usable storage volume for the service area served
equaling 125 percent of the ADD, plus the demand required for fire flow. The existing transmission and
distribution systems should be sized and arranged to minimize friction-generated line losses and provide
the required fire flows.
Current system design criteria for the TMWS water system are described below, in terms of demand,
supply, storage, and distribution system assumptions.
4.2.1. Demand
Demand flow and population estimates are based on TMWS water system estimated water use data and
existing parcel connection information.
. Average daily per capita water usage for equivalent dwelling units ......................... 125 GPCD
. Average number of persons per single-family dwelling unit..................................................2.7
. Ratio of peak day to average day............................................................................................2.0
. Ratio of peak hour to average day ..........................................................................................3.5
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4.2.2. Supply
The criteria for the evaluation of supply projections to each individual service area is listed as follows:
. Well capacity to meet PDD with the largest well out of service.
. Minimum supply from well and boosters pumping to elevated storage shall meet PDD.
. Minimum booster capacity to service areas without elevated storage shall meet peak hour demand or
PDD plus fire flow, whichever is greater.
4.2.3. Storage
The criteria for storage capacity requirements for the water system is based upon the following:
. Provide storage volume equal to a minimum of 1.25 times the ADD.
. Provide additional storage volume required to provide fire flow for appropriate durations.
4.2.4. Distribution System
Pipeline design within the distribution system is based upon the following criteria:
. System design and construction to meet A WW A and ADEQ requirements.
. Transmission lines serving PDD only shall be designed for a maximum velocity of 5 feet per second
(ft/sec) with a minimum pressure of35 psi. Transmission lines serving PDD plus fire flow shall have
a maximum velocity of 10 ft/sec and a minimum pressure of20 psi.
. Maximum friction head loss for lines up to and including 8 inches in size is to be 8 feet per 1,000 feet
or less. Head loss for lines between 8 and 10 inches in size is to be 5 feet per 1,000 feet or less,
according to pipe size. Head loss for lines 12 inches and larger in size is to be 4 feet per 1,000 feet or
less.
. Distribution lines to be sized and arranged to provide required fire flows.
4.3. EXISTING SYSTEM DEMANDS
The existing water system, as shown in Exhibit I is divided into nine separate service areas. The
boundaries of the existing service areas are also provided on Exhibit 1.
Table 4-8, Existing Water Usage Summary, estimates the ADD, PDD, and PHD for each service area
within the TMWS.
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- - ----------- - -- - - - - - - ----- - - - - -----
1< :\j,ting
1.t1uh.lll'ot \\l'l".lgl' 1>.111\ Pl'.d\ n.II" Pl'.11-.. lIour
\\ .lfl'l" Sl'I' ire \1 i.',j IhH'l\lB~ l Ilih f)l'IIl.I~d i.J.~(IYI) _ _ _1>~JI}.lIl(1 (grill) - Iklll.~dJg~lll)
- - - - - - - - - - - - - - -
North Marana 1,211 284 568 993
Picture Rocks/Continental
Reserve/Springs 1,321 310 619 1,084
Cortaro/Oshrin 441 103 207 362
Airline Lambert 141 33 66 116
La Puerta 76 18 36 62
Palo Verde 67 16 31 55
Hartman Vistas 350 82 164 287
Aimort 50 12 23 41
Falstaff Flats 6 2 4 7
TOTAL 3,662 859 1,718 3,007
TABLE 4-8. Existing Water Usage Summary
Water system usage demand calculation examples are based on the previous design criteria and are as
follows:
Equivalent Dwelling Unit (EDU) Usage
ADD = 2.7 persons/unit x 125 GPCO/l,440 = 0.234 gpm/EOU
POD = ADD x 2.0 = 0.243 x 2.0 = 0.469 gpm/EOU
PHO = ADD x 3.5 = 0.851 x 3.5 = 0.82 gpm/EDU
4.4. EXISTING SYSTEM REQUIREMENTS
The water system design criteria as previously provided was used to develop the existing capacity
upgrade requirements for the TMWS. Existing system requirements include the capacity upgrades
needed for wells and storage to serve all existing connected parcels.
4.4.1. Wells
Well production requirements are based on meeting POD with the largest well out of service. A summary
of the existing well capacities and the additional well capacity required is presented in Table 4-9, Existing
Well Capacity Requirements. As shown in Table 4-9, overall the TMWS exceeds the POD well
requirement of 1,782 gpm, as existing well capacity is 12,971 gprn.
Q:\Jobs\500's\527,Ol\lmpact Fees\Chapter 4 - EXistlng System Analysis update 200S.doc
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
~
~
- - - ----------- - - - - - - -- ------ - -----
\\ ell
H.cquln'llll'nl I \i...till~ \\ l'lI Short.l~l' \\ dl I \n''''' "dl
\\ .ltl'r Sl'1 \ in' \n';1 (1~1>1~-~~fI))_ ~ .IE,Il'il~ 1 gp~ll)_ (_.lp~ll:it~ (~IJI~) - _< '~Jl.~lt~Jt:.l!IlJL _
- - - - - - - - - - - -
North Marana 589 2,883 494
Picture Rocks/ Continental
Reserve/ Sorin~s 642 1,950 1,308
Cortaro/Osbrin 214 1,225 51\
Airline Lambert 69 254 55
(0) no redundant
La Puerto 37 800 well capacity
Palo Verde 33 260 27
Hartman Vistas 170 1,150 980
Airoort 24 4,390 1,866
(0) no redundant
Falstaff Flats 4 59 well canacitv
Totals 1,782 12,971 5,241
TABLE 4-9. Existing Well Capacity Requirements
* Assumes largest well out of service or emergency interconnect.
4.4.2. Storage
Storage sizing requirements are based on meeting 1.25 times the ADD plus fire flow. The fire flow
requirement for the North Marana and Cortaro/Oshrin service areas is 1,500 gpm for two hours. The fire
flow requirements for the Picture Rocks/Continental Reserve/Springs and Airport service areas are 2,500
gpm and 2,750 gpm for two hours, respectively. Fire flow requirements to the Hartman Vistas and La
Puerta service areas is 1,000 gpm for two hours. The fire flow requirement for the Palo Verde and
AirlinelLambert service areas is 300 gpm for two hours. The storage requirements by service area are
presented in Table 4-10, Existing Reservoir Capacity Requirements.
Q:\Jobs\500's\SZ7.01\lmpact Fees\Chapter 4 - ExIsting System Analysis Update ZooS.doc
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
~
~
TABLE 4-10. Existing Reservoir Capacity Requirements
-- - - - --- - - - -- --- - - -- -- - - --
1'1l1"hk
Sl1n ,lgl' Illl'llo\\ I oLd Shol t.ll.!,l
'~({jUI' lllltlll '-;/111,1121' Slot .I)..:l I \I,lill~ Slot ,lgl I \0 '"
\\ ,lIn ....l'I' Ill' \ 1.1~ \1>1l HUJllllt'llItlll Rlt]lllll'llIllll Stllt,lt:l' ( .Ip,llll\ ....'01 ,lgl'
\1(',1 (.;.11) jg"ll _IB.II) - ~ .IJl,ll~\ (g.lIJ_ _ig,ll) - (~lp,lli~Jt:.II)
--- - -- -- - -
North Marana 529,200 180,000 709,200 1,075,000 365,800
Picture Rocks/
Continental 577 ,800 300,000 877,800 2, I 00,000 1,222,200
Reserve/
Sorines
Cortara / asbrio 192,600 180,000 372,600 185,000 187,600
Airline Lambert 61,200 N/A 61,200 50,000 11,200
La Puerta 32,400 N/A 32,400 20,000 12,400
Palo Verde 28,800 N/A 28,800 25,000 3,800
Hartman Vistas 153,000 120,000 273,000 500,000 227,000
Airoort 21,600 330,000 351,600 505,000 153,400
Falstaff Flats 2,610 N/A 2,610 10,000 7,390
Totals 1,599,211 1,110,000 2,709,210 4,470,000
According to Table 4-10, the TMWS requires an additional 385,826 gallons of storage within the
Airline/Lambert, Cortaro/Oshrin, La Puerta, and Palo Verde service areas to meet the 1.25 ADD storage
criteria. The North Marana, Picture Rocks/Continental Reserve/Springs, Falstaff Flats, Airport, and
Hartman Vistas service areas have sufficient storage to meet demands in those zones.
4.5. EXISTING SYSTEM CAPITAL IMPROVEMENT RECOMMENDATIONS
The evaluation of the existing potable water system indicates that the majority of the individual service
areas within the TMWS' area have sufficient wen capacity, redundancy or interconnections with adjacent
facilities where the source water capacity is appropriate to serve the existing customers. However, the
evaluation of storage capacity indicates that there are approximately four areas where existing facilities
either need to be modified or development needs to be connected to provide redundancy to said systems.
The capital improvements recommended are discussed in the following sections.
Q:\Jobs\500's\527.01\Impact Fees\Chapter 4 - ExIsting System Analysis Update 200S.doc
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TOWN OF MARANA POTABLE WATER MASTER PLAN - 2005
~
~
4.5.1. Cortaro Ranch/Oshrin Area
The evaluation of the storage capacity for the Cortaro/Oshrin area indicates that this service area is
deficient by approximately 187,600 gallons of storage capacity. Due to the fact that this service area is
ultimately planned to connect to the Hartman service area, which currently has an excess of 227,000
gallons of storage, an interconnection with the Hartman Vistas system, including an 8-inch main
extension and PRV station will provide the redundancy and additional storage capacity needed for fire
protection and other domestic demands, if required. The estimated construction cost for this main
extension is $175,000.
4.5.2. Airline/Lambert System
The evaluation of the AirlinelLambert system indicates that this system is approximately 11,200 gallons
short in reservoir capacity. It is our understanding that the design of the AirlinelLambert system did not
include fire protection. To upgrade the storage for this service area, it is recommended that an
interconnect with the Saguaro Springs project be provided to supply redundancy and additional source of
water to the AirlineILambert system as future development occurs in the area.
4.5.3. La Puerta
The TMWS has recently modified the La Puerta booster station and well system to provide appropriate
fire protection and source water for the area. However, based upon the condition of the existing reservoir
onsite and the fuct that the La Puerta water system with the existing reservoir is approximately 12,400
gallons short of its required capacity. This system also does not have the storage capacity to meet its fire
flow needs; it is recommended that a new 250,000 potable water storage tank be constructed at the La
Puerta site. The estimated cost for said improvements is $175,000.
4.5.4. Palo Verde
The Palo Verde service area is also another small service area that was never initially designed for fire
protection. Although the storage capacity is deficient by approximately 3,800 gallons, a redundant well
has been installed by the TMWS, which reduces the storage requirement with aquifer storage to meet the
minimum ADEQ standards. This, in addition to the fact that the TMWS has installed connections so that
the fire department can pump and haul directly from the existing reservoir in the event of an emergency,
no improvements are recommended for the Palo Verde site. At the end of the effective service life of the
existing reservoir, it is recommended that it be replaced with a 100,000-gallon reservoir.
Q:\lobs\500's\527.01Umpact Fees\Chapter 4 - Existing System Analysis Update 200S.doc
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AFFIDAVIT OF PUBLICATION
STATE OF ARIZONA
COUNTY OF PIMA
ss.
Audrey Smith, being first duly sworn, deposes and says that (s)he is the Legal
Advertising Manager of THE DAILY TERRITORIAL, a daily newspaper printed and
published in the County of Pima, State of Arizona, and of general circulation in the City of
Tucson, County of Pima, State of Arizona and elsewhere, and the hereto attached:
NOTICE OF PUBLIC HEARING
PROPOSED WATER DEVELOPMENT IMP,l\CT FEES
was printed and publiShed correctly in the regular and entire issue of said THE DAILY
TERRITORIAL for 1 issues; that was first made on the 8th day of July 2005
and the last publication thereof was made on the 8th day of July 2005;
that said publication was made on each of the following dates, to-wit:
07/08/05
at the Request of:
Town of Marana
JAMIE C. MACIAS
l____ ,Legal Advertising Manager
e this 8~!1 day of JUIYA 2005 n
Y\,~\-/ /.: ' G------zJ
Notary Public - Arizon 0 ary Public in and for the County of Pima, State of Arizona
Pima County
Expires 02/04/08 ~ l A / (1\..;>
My commission expires: '. ../ '--"'\ ~ (5-
NOTICE DF PUBLIC HEARING
ON
PROPOSED WATER DEVELOPMENT
IMPACT FEES
The Town of Marana hereby gives no-
tice pursuant to A.R.S. 9 9-463.05 of its
intention to adopt water development
impact fees totaling $2,333 per equiva-
lent dwelling unit. The Marana Town
Councii will conduct a public hearing to
consider the proposed water develop-
ment impact fees on September 6,
2005, at or after 7 PM at the Marana
Town Council Chambers, 11555 W.
Civic Center Drive, Marana AZ. For in-
formation, call the Town of Marana Wa-
ter Department at 520-382-2570.
PUBLISH: The Daily Territorial
July 8, 2005
hrSep6waterlmpactfees s.s