HomeMy WebLinkAboutMarana Gardens Specific Plan 1988RECEIVE
[AUG 1 1 1988
F a. O
ASSOCIATES
Ei'IG(I\LERS
MARANA GARDENS
'
SPECIFIC PLAN
The south
330 feet of the north 695
feet
of the NE
4, NE-4.,. Section 28, T 11
S;.
'
R.11 E I in
the Town of Marana, Pima
County,
Arizona.
March 1988
Prepared For,:
•
MARANA
INTERNATIONAL:DEVELOPMENT
CO.
P.O. Box 848
Marana, r ?. izona
85238
(602) 622-3328
Prepared .By:
John B. Oder P.E.
'
9345 Paseo Tierra Verde
Tucson, Arizona 85749
( 602 ) . 749=4.159
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MANRANA GARDENS SPECIFIC PLAN
PART ONE: DEVELOPMENT CAPABILITY REPORT
GENERAL DISCUSSION
1
MAP OF THE TOWN OF MARANA
3
SPHERE OF INFLUENCE MAP
4
LAND FORM / OPEN SPACE MAP
5
TOPOGRAPHY AND SLOPE ANALYSIS
6
HYDROLOGY AND WATER RESOURCES
6
TOPOGRAPHIC MAP
7
WATER RESOURCES MAP
8
VEGETATION AND WILDLIFE HABITAT
9
GEOLOGY AND SOILS
9
PALEONTOLOGY AND CULTURAL RESOURCES
10
EXISTING STRUCTURES
10
EXISTING INFRASTRUCTURE
10
PART TWO: SPECIFIC PLAN
OBJECTIVES
16
PROPOSED USE
16
ZONAL LAND USE MAP
18
ZONAL INTENSITY MAP
19
EXISTING LAND USE MAP
20
AREA MAP
21
SURROUNDING STRUCTURES
22
SPECIFIC PLAN IMPLEMENTATION AND AUTHORITY
23
REGULATIONS AND PROGRAMS FOR IMPLEMENTATION
24
PROCEDURE FOR AMENDMENTS
25
'
LAND USE AND RESTRICTIONS
26
HYDROLOGY
CIRCULATION PLAN
27
27
FUTURE CIRCULATION PLAN
28
'
CIRCULATION MAP
29
UTILITY PLAN
30
'
LANDSCAPE PLAN
31
OPEN SPACE
31
SURVEY MAP AND LEGAL DESCRIPTION
32
APPENDIX
DRAINAGE REPORT
ARCHAEOLOGICAL REPORT
' AERIAL PHOTO - SURROUNDING USES
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' MARANA GARDENS SPECIf'I
^_ C PLAN
PART ONE: DEVELOPMENT CAPABILITY REPORT
The development capability report consist of maps and
text summarizing the impact of the proposed development
' on the site conditions existing on the land to be reg-
ulated by the Specific Plan for Marana Gardens Subdivision.
This report outlines the physical and cultural aspects of
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the property and thus providin 0the Town of Marana, the
Town Council, the Planning Commission and all other con-
cerned citizens the needed information to evaluate those
properties of this proposed project.
' Current conditions in Marana and environs indicate a need
for moderately priced new homes. This plan is being pre-
pared to aid in meeting that need and to form a nucleus
for future Down Town Marana Core Development. The intent
' of this plan is to inhibit urban sprawl, traffic congestion
and associated pollution.
' GENERAL DISCUSSION
' Marana Gardens is located within the corporate limits of
the Town of Marana. It is near existing schools,commercial
' and residential developments. It fronts on Sandario Road
and lies approximately 365 feet south of Greer Road. Inter-
state 10 has an interchange about one half mile north of
the site. The Santa Cruz River is approximately one and
' one half miles to the south.
Page 3 shows the location of the property within the Town
' of Marana boundary.
IGENERAL DISCUSSION (Continued)
' Presently the Town is primarily agriculture in nature.
The adoption of the TOWN OF MARAN.A GENERAL PLAN shows
' the Town's intentions for an orderly transition into
an urban community which will provide a comfortable
quality of life style for its citizens.
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The Town
of Marana
General Plan shows
the subject property
within zone
G with
a zone intensity 1,
the residential
'
range is
4.0 RAC and
a target of 8.0 to
10.0 RAC. The
density
proposed by
this Specific Plan
for Marana
Gardens
is 5.3 RAC.
This is at the low
end of the rec-
ommended
intensity
and well below the
target density.
' The circulation map proposed that Sandario Road be
extended southerly to the existing Tangerine Road align-
ment and thence easterly to the existing Tangerine Road
Intersate 10 interchange.
' The Water Resources Map indicates that the Specific Plan
' Area is outside the Santa Cruz River flood plan. A flood
plain study is currently underway by CMG Engineering for
the area north of the Santa Cruz River. A hydrology and
' hydraulic report by CMG Engineering is included in this
Development Capability Report.
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INFLUENCE
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1. TOPOGRAPHY AND SLOPE ANALYS.LS
The Marana Gardens Specific P1an,Area is located on the
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west side of Sandario Pcad and.sou.th of Grier Road. The
area lies between an apartment complex and primarily
vacant land to the north and a.trailer park to the south.
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The topography of the site is uniform and sloping only
rslightly
from east to west.
The site has been farmed for many years although not
under cultivation at this time.
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The the
elevation along westerly edge of the property
rproperty
is 1980. The elevation along the easterly edge of the
is 1982. This
yields an average cross slope
of .0016 feet per foot.
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To provide site drainage for development pur osed and
to insure against flooding,the' center of the property
will have to be raised. This. will provide a more pleasing
rrolling
appearance to the Terrain.
2. HYDROLOGY AND WATER RESOURCES
See drainage report by'CMG Drainage Engineering included.
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WATER RESOURCES
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3.. VEGETATION AND WILDLIFE HABITAT
This site has been used for.agricultural purposes for
many years. As a result of the farming activities no
native vegetation or wildlife habitats remain on the site.
The area between the north boundary of this Specific
Plan and G ee Road is residential or cleared vacant
land. The adjacent area to the south is a partially
developed trailer park. To.the west.lies open farm land.
All adjacent lands and this site have long been devoid
of native vegetation and wild life habitat.
Contact with the Tucson office of.the Arizona Game and
Fish Department revealed that there is a remote possibility
that Desert Tortoise.and Gila Monster might be found.
If either of these species is encountered on the site
they are to be relocated to the safer more suitable
environment of the Santa Cruz..River area.
4. GEOLOGY AND SOILS
The geology of the area.is of a sedimentary nature formed
at the time when the Santa Cruz and Avra Valleys were
closed basins, probably during the Pleisticene age
or earlier.
The soil on the site is very uniform as a result of
many years of cultivation. It is of the Gila Loam
classification with minor amounts of silt and clay. The
soil has moderate permeability with low shrink -swell
characteristics.
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GEOLOGY AND SOILS (Continued)
Soils of this type are suitable for construction purposes
as they can be excavated and compacted with conventional
construction equipment. Because of the proximity to
occupied dwelling units dust will not be allowed to
escape the site during grading operations.
5. PALEONTOLOGY AND CULTURAL (ARCHAEOLOGICAL AND HISTORIC
Professional Archaeological Services and Technologies
have made an on site survey and presented:.their-'findings
and recommendations in the included report.
6. EXISTING STRUCTURES, ROADS AND OTHER DEVELOPMENT
The site has historically been used for agricultural
purposes: At the present time'it is not under cultivation.
As a farm field," it contains no structures, roads or
other.development.
7. EXISTING INFRASTRUCTURE AND PUBLIC SERVICES
SANITARY SEWERS
There is an existing eight inch sewer in Sandario Road
adjacent to the site frontage. There is capacity in the
sewer line to serve this development, however, the pumping
capacity in the Trico-Marana Road pressure line may
require augmentation. The Marana wastewater treatment
facility will require expansion as the development
progresses.
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SANITARY SEWERS (Continued)
Included is a letter from Pima County Wastewater
Management outlining their requirements.
WATER
The site is adjacent to a producing well. This well is
owned by the Cortaro Water Users Association andAinancial
arrangements can be made to serve this site from that well.
When the, Town of Marana is successful in establishing its
planned municipal water company it will become responsible
for providing water service within the corporate limits
of the Town of Marana. A standard aid in construction
agreement will assist the Town in providing water service.
TELEPHONE
Telephone service exists along Sandario Road and is adequate
to serve this development.
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PIMA COUNTY
WASTEWATER MANAGEMENT DEPARTMENT
137 WEST CCNGRESB
TUCSiDN, ARILONA 85701
GEORGE A. BRINSKO
Director
Mr. John B. Oder, P.E.
9345. Paseo Tierra Verde
Tucson, Arizona 85749
February 10, 1988
IRE: Marana Gardens Development
Public Sanitary Sewerage Service
PH: 792-8676
' Dear Mr. Oder:
In response to your letter of January 27, 1988, wherein you requested this
' Department's conditions/requirements for the noted Subdivision achieving
public sanitary sewerage service, I offer the following comments:
1. Under existing conditions (actual developments and commitments for
' service through approved Sewer Service Agreements), adequate capacity
does not exist for this proposed development within the public sani-
tary sewerage facilities currently serving the Marana area.
'2_ A preliminary analysis of the drainage basin indicates that one or
more of the existing public wastewater pumping systems (WWPS) down-
stream of the proposed development, may have to be augmented. The
cost of augmenting/upgrading those WWPS', including any additional
rights-of-way that may be necessary, will be the responsibility of
the owner or developer; without reimbursement from Pima County.
' 3. In addition, the existing public wastewater treatment facility does
not have capacity available, in its present configuration, to accom-
modate all of the Marana Gardens ultimate projected sanitary sewage
flows. It is this Department's policy that any required expansion of
an existing public wastewater treatment facility should be accom-
plished by the County through its Capital Improvement Program (CIP) -
utilizing funds from the Wastewater Management Construction Fund.
When the need for additional capacity precedes the CIP schedule for
those improvements (which is the situation in this instance); then
' the developer is given the option of either funding and accomplishing
the required work themselves, or waiting for the County to accomplish
the work via the CIP.
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Mr. John B. Oder, P.E.
February 10, 1988
Page -2
' The current CIP cal's for :tire Marana ,,FYJTF to be expanded/relocated in
FY 1988-89. Because the present site::for the Marana WWTF is neither
appropriate for a large r) faci.l.ity;._,nor is it positioned within the
' overall basin so as to provide maximum benefit to the Town of Marana,
we are quite reluctant to util:i-ze:bdnd funds to enlarge - even on an
interim basis - the Marana facility at its current location. Hence,
' it is quite doubtful that additio-nal capacity could be made available
for projects such as Marana Gardens in the near future.
' B. A Certificate of Deposit at a local bank, or
C. A Construction Bond for the Marana WWTF interim improvements,
with appropriate instructions, or
' D. A Letter of Credit for the Marana WWTF interim improvements, with
appropriate instructions.
Word of Caution: The more sewage.that is placed into the existing
WWTF, prior to commencing the required interim improvements;.the more
' difficult (and, costly) it may become to actually.accompl.ish the
involved improvements!
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With the above noted information taken into consideration (and if
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Marana Gardens desires to connect to'the system prior to the comple-
tion of the above referenced CIP project), we would requirethat the
owner/developer of Marana Gardens plan, design, front-end finance,
'
acquire any required permits and construct.improvements to the exist-
-
ing WWTF - all as required to provide the additional "interim" treat-
ment (and disposal) capacity needed to accommodate sewage from the
'
forty-eight (48) units of the Marana Gardens project. The costs
associated with the.construction (only) of the involved physical/
interim improvements to the WWTF would be eligible for sewer connec-
tion fee credits.
4. Wastewater Management, through its Capital Improvement Program, will
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strive (with the support/assistance of the Town of Marana) to have
the first phase'of a new regional WWTF (and the initial segments of
the associated influent interceptor/trunk sewers) ready for service
in mid -1989.
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5. In the event that the owner/developer of Marana Gardens would desire
to connect up to. twenty-five (25) of the project's first housing
units into the existing Marana VWTF - prior to the completion of the
'
required interim improvements to the existing WWTF; financial assur-
ances for the costs associated with the required interim WWTF
improvements - in one of the foilowing'forms - would need to be
provided to Wastewater Management:
A. A Third Party Trust Assurance Agreement, in the same format as
the Pima County Assurance Agreement, modified to reflect.Town of
Marana, as appropriate, or
' B. A Certificate of Deposit at a local bank, or
C. A Construction Bond for the Marana WWTF interim improvements,
with appropriate instructions, or
' D. A Letter of Credit for the Marana WWTF interim improvements, with
appropriate instructions.
Word of Caution: The more sewage.that is placed into the existing
WWTF, prior to commencing the required interim improvements;.the more
' difficult (and, costly) it may become to actually.accompl.ish the
involved improvements!
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It should be noted here that the owner/developer (or their authorized agent)
will have to apply for, and be issued, a construction permit for the installa-
tion of the involved public sewage conveyance facilities, and for the required
"interim" improvements to the Marana 19WTF - all prior to commencing the actual
work on the development (progress) in the field. Any.required easements will
need to be secured and provided to Pima County prior to the release of the
involved public sewerage facilities.
'
It should be noted that the owner/developer of properties lying.easterly of
I-10 (from Tangerine Road to the Pima/Pinal border) are contemplating the
Mr. John B.
Oder, P.E.
along and immediately adjacent to the I-10/SPRR corridor, to serve the
February 10,
Page -J
1988
involved area and convey the sewage to the proposed/relocated Marana WWTF -
near the Pima/Pinal border (west of I-10). The degree of service/relief that
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6. To
summarize:
The
following issues/items must be rely>olved before any building permits
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are
issued by the Town of i*V4arana.for units within Marana Gardens:
be abandoned when .that new sewer is placed into service. The improvement
A.
The owner/developer shall prepare approvable (by PCWWMD) Con-
tion is as yet unknown.
struction Documents for the required public sanitary sewage `
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conveyance facilities - including any necessary augmentation of,
questions, please contact me at 792-8676.
tRichard
-the downstream public wastewater pump:i.ng system(s).
B.
The owner/developer shall prepare approvable (by PCWWMD, ADEQ and
'
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PCDOT & FCD) Construction Documents for the required "interim"
xc: George A. Brinsko
improvements to the existing Marana WWTF; and the associated
Ray Teran
'
financial assurances, as described above in Section 5.
C_
A formal Sewer Service Agreement (SSA) must be consummated
Jerry B. Stratton
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between the owner/developer and Pima County (or their authorized
agent) for the project, as a whole or in phases.
It should be noted here that the owner/developer (or their authorized agent)
will have to apply for, and be issued, a construction permit for the installa-
tion of the involved public sewage conveyance facilities, and for the required
"interim" improvements to the Marana 19WTF - all prior to commencing the actual
work on the development (progress) in the field. Any.required easements will
need to be secured and provided to Pima County prior to the release of the
involved public sewerage facilities.
'
It should be noted that the owner/developer of properties lying.easterly of
I-10 (from Tangerine Road to the Pima/Pinal border) are contemplating the
formation of an improvement district to design and install a trunk sewer,
along and immediately adjacent to the I-10/SPRR corridor, to serve the
t
involved area and convey the sewage to the proposed/relocated Marana WWTF -
near the Pima/Pinal border (west of I-10). The degree of service/relief that
that proposed sewer will provide to areas ;tying southerly of I-10 (such as the
'
system(s) to which Marana Gardens will be tributary) is still unknown. It is
conceivable that the sewer may cause one or- more of the downgradient WWPSs to
be abandoned when .that new sewer is placed into service. The improvement
'
district is still in the planning stage; hence, the estimated date of comple-
tion is as yet unknown.
I hope this letter addresses your concerns in this matter, and if you have any
'
questions, please contact me at 792-8676.
tRichard
G. Harrington, .E., R.L.S.
Chief Engineer
'
RGH:hlb
xc: George A. Brinsko
Ray Teran
'
Jon C. Schladweiler
Mark R. Stratton
'
Jerry B. Stratton
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February 16, 1988
Richard G. Harrington P.E.,R.L.S.
Grief Engineer
Pima County Wastewater Management Department.
130 West Congress
Tucson, Arizona -85701
RE: Marana Gardens Subdivision M12-87-1
Public Sanitary Sewage Service
Dear Nr. Harrington:
This letter is to confirms my understanding of the results of our meeting
on February 12, '1988.
'Ihe subdivision will consist of forty-six (46) single family detached
dwelling units.
Standard sanitary sewer collection plan with the associated approvals.
and permits are required for the subdivision.
Wastewater Management has scheduled upgrading of the.downstream pumping
facilities so it is therefore unlikely that any additional pumping augmenta-
tion will be required.
Interim improvements to the existing Marana WWTF will be required. The
Arthur Beard Engineers Design Report dated January, 1987, will be used to
evaluate the needed interim improvements. A supplimental design report based
on the A.B.E. Report if required.
Twenty-five housing units will be allowed.connections prior to the comple-
tion of any interim WWrF providing the plans .pave been approved and the as-
surances have been posted to cover the construction cost.
' A Flood Plain use permit.and a sewer service agreement is required.
.If all of the above statements are correctt,'no response to this letter
' is requested. If not, please let me know as SC)On as possible.
Very Truly Yours,
John B Oder P. E.
' JO/mj 1 15
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MARANA GARDENS SPECIFICPLAP3
PART TWO: SPECIFIC PLAN. TEXT ELEMENT ,
'
OBJECTIVES
'.
The the Marana Garden Specific Plan is to:
objectives of
'a.
-Provide a point of beginning for residential and
ultimately other types of growth radiating out from
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the Town Core.
b. Provide housing with a neighborhood setting which
will enhance the value of the area and still be
within the economic reach of future Marana residents.
c. Establish land use patterns which will encourage car
'
pooling and reduce automobile trip generation.
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d. Provide flood protection for this area.
'
PROPOSED USE
The land use proposed by the Marana Gardens Specific Plan
is.single family detached residential. The Marana General
t
Plan designates Zone G with a zone intensity of 1, a res-
idential
range of 4.0 to 22.•0 RAC and a Target of 8.0 to
10.0 RAC.
The density proposed by this Specific Plan if 5.3 RAC.
'
This is below the target near the low end of the residential
range. The Marana General Plan does not specify lot size,
however to achieve the recommended density small lots or
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PROPOSED USE (Continued)
Multiple family units will be required.
The surrounding neighborhood is a composite of residential
types.
On' the east side of Sand.ario.Road are small single family
detached and mobile homes._To the north is a low income
apartment complex, mobile homes and vacant land. To the
west is open farm land. To the south is a partially
developed trailer park with a few scattered trailers.
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A R I Z O N A
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' 1 = EXISTING LAND USE.
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TOWN OF MARARN13A
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A R I Z 0 N A
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AREA MAP WITH SEWER LOCATION
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PROCEDURES FOR AMENDMENTS TO;THI:S;SPECIFIC PLAN
The Specific Plan may be,amended,b'y submitting a written
application for amendment to°ahe Tlanning and Zoning
t
Administrator. The application shall state the regulation
or. regulations that 'are to be amended and theVaa feet such.
ammendments will have on the remainder of the plan. All-
Specific Plan amendments shall be in substantial
conformance with the intent of th'e original Specific Plan.
The Planning and'Zoning Administrator shall refer the.
amendment request with his recommendations to the Planning
'h
Commission for Public Hearing. The Planning Commission
Town,Council. The
shall make its recommendation to the To
Town.Council will act on the proposed amendments after
holding Public Hearing the
a on subject...
'
The planning and Zoning Administrator may allow minor
changes to the Specific Plan, providing the modifications
do.not conflict.with the-intent of the original plan.
Minor changes do not include increasing building heights,
..densities or a change in.the.residential use.
25
I ..
I
' LAND USES AND RESTRICTIONS
i
I. RESIDENTIAL - HOMES:INTENDED F'O:R THE OCCUPANCY'
OF A- SINGLE RAML,LY:
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5. Front a}nd rear and seth cks. from the
y
r e.r n
p op ty li e:-.
-'
1
The minimum setbacks :shall be- equal to
the building 20 -feet
the height . of
or whichever is
greater.
6. Side Yards: The .side -yards shall be.a
minimum of 10 feet
unless zero lot line construction is
used. If the zero
1
lot line.opti.on is chosen the minimum
distance between
buildings shall .be 20 feet.
1
7. Parking: A minimum of two off street
parking spaces,
not less than 8%2 feet wide.and 20 feet
long shall be
1
provided on each lot.
1
i
1
1
26 A
Y
LAND USE AND RESTRICTIONS (Continued)
i'
8. Access:" Accesslot,;.wit .hi.n this development
shall be from 'a pu'Llzcly c'cdica:ted. street.
9. Street improvements: The. streets within this development
shall be constructed with a minimum roadway width o£
30 feet. of pavement`; concr;e,te •'curbs`, and gutters and
'
4"foot wide .con`cr"ete.sidewalks .on each side :of the
roadways.. The sidewalks are to'be..constructed adjacent
to the back of the curbs. Suffici.en.t.right of way
is to be dedicated toP rovide for all of the. proposed
roadway facilitates.The proposed ROW is 50 feet.
HYDROLOGY
A hydrology and drainage analysis is presented in the
included drainage report by CIG Drainage Engineering.
CIR"CULATION PLAN.:
The small size of thisproject dictates that all const-
ruction be accomplished in a single phasd.
this
Sandario-Road which ,serves project has adequate
capacity. to Yandle the additional traffic generated by'
'
t"his.project. For'eas'e of ingress,and egress to the site
Sandario'Ro.ad is to"be' widened to provide an acceleration
.and deceleration lune. :An "additional 1Q feet .of .right. of
"
way is to be dedcated.for,Sandario Road..
Because of the setting street lighting is not proposed,
1
for this. project:
t27
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CIRCULATION PLAN
The eas end of the new street will be barricaded to
.prevent intrusion on to the neighboring property.
The eas erly cul-de sac will serve as a temporary
turn around.
28
CIRCULATION
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Proposed Interchange -
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Existing Interchange % '^ �-� ; :•�� . •.'_
state Hghway�_ 5" ..
Koy Feature
' �� 1 Principal Arterial
TOWN OF MARANA
29
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UTILITY PLAN
Eight inch sanitary sewers will be
each lot within the subdivision. Th
will be prepared to Pima County Was
standards and processed for approva
When accepted they will be maintain
It is proposed that the existing tri
expanded simultaneously with the hoi
Electrical service will be provided
Power Company.
Gas Service will be provided by Soul
Company.
Domestic water will be provided by
Association.
Solid waste pick up will be by SCS
The above services require service
payment of the appropriate fees.
All utilities are to be underground.
NEI
)nstructed to serve
construction plan
water Management
by that agency.
I by Pima County.
fitment ponds be
;ing construction.
,y Tucson Electric
ern Arizona Gas
rtaro slater Users
rporation.
agreements and the
'
LANDSCAPE
PLAN
b
The front yards of
each of the.lots.are to be
landscaped
in a desert motif
using low water consumption
vegetation.
OPEN SPACE,
The Specific Plan
area is less than 10 acres.
A cash
'
contribution will
be made to the Town of Maran'a per
section 0.6.03.02 E'of
the Development Code.
'
31
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LEGALDESCRIPTION:
The south 330 feet of the North 695 fee't of the
NE 4j NE k, Section 28, T 11 S, R 11 E,GSR B&M.
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LEGALDESCRIPTION:
The south 330 feet of the North 695 fee't of the
NE 4j NE k, Section 28, T 11 S, R 11 E,GSR B&M.
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'
Prepared by:
CMG DRAINAGE ENGINEERING, INC.
110 S. CHURCH AVE„ STE. 458
'
TUCSON, AZ 85701
For:
'
JOHN ODER, P. E:
9343 PASEO TIERRA VERDE
TUCSON, AZ 85749
t
'
MARCH 9, 1988
`
'
�` � ���E ^rf � •moo.
5275
Y U N A '
SS
URA, %325-
Page
1
3
3
3
6
2
5
7
.g
TABLE OF CONTENTS
r
I. "INTRODUCTION
H. HYDROLOGY.
'
2.1. Offsite Hydrology
2.2 Onsite Hydrology
'
III. ONSITE DRAINAGE PLAN
LIST OF FIGURES
'
FIGURE 1 - LOCAT'10N. MAP
FIGURE 2 - DRAINAGE BASIN BOUNDARY MAP
A
FIGURE 3 SITE PLN
'
FIGURE 4 - FEMA STUDY MAP.
1
t
Page
1
3
3
3
6
2
5
7
.g
I. INTRODUCTION
' This report presents the results of a, `drainage 'study for a parcel of land
located within Section 28, 'Township 11 South', Range 13 East, GSSRBEM,
' Pima County, Arizona.. A 'location map -for the- subject property is shown
' on Figure 1 of this report. The parcel is', approximately 9.5 acres in size
and is bounded on the east by Sandar.io Road between Grier Road and
' Barnett Road. The property is planned as a housing development.
'
addressed .the offsite and onsite -drainage which impacts_ upon
This ,report 9
'
the subject property and the 'with -project drainage design plan.
'
The methodology used to compute peak discharge rates was taken from the
Pima County Hydrology Manual. This . methodology was selected for use
'
County.
because it has been calibrated to small watersheds within Pima
'Additionally,.
the Town of . Marana is, currently drafting a floodplain
ordinance which. issomewhat similar to the Pima County Floodplain
'
Ordinance. Therefore, use of the Pima County method will assure
compatibility with existing and future drainage design standards:
Finished floor elevations for structures within this development were
established based upon water surface elevations- for a 100 -year flood on the
'
Santa Cruz River of 70,.000. cfs. The revised regulatory floodplain maps
have 'been reviewed and approved by ' the Town. of Marana and will be
'
adopted by the community in the near. future. Setting the finished. floor
'
elevations based upon this information will insure compatibility with future
- conditions regulatory floodplain mapping` and floodplain ordinances.
1
L-_ u n u\ n c`
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II
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it II
11. HYDROLOGY
' 2.1 Offsite H drolo
Y gY
' One offsite drainage basin impacts upon the subject property. This basin
collects runoff from a 20.8 -acre .area to. the south and east of the subject
' property: Runoff generated by basin' #1 flows north. along Sandario Road
within a ditch along the west -side of "the road. The 100 -year peak dis-
charge rate at CP#1, located at the southeast corner of the subject .prop-
' ei-ty, is 80 cfs. Runoff from basin #1 continues north past the subject
property and then flows west -in a ditch along the south side of Grier
Road...
' 2.2 Onsite Hydrology
Y gY
' The subject. property is divided into two onsite drainage basins. Basin #2
collects runoff from. the eastern, 3.6 acres of the site. Runoff. generated
by basin #2will flow east 'into the ditch along the west .side of Sandario
Road-. The runoff will then be carried north within the ditch as described
above for basin #1. The 100 -year peak runoff rate with the proposed
' development is 25 cfs.
Basin #3 collects runoff from a 5.9 -acre area of the subject property.
Runoff generated by basin #3 :will flow west across the subject property
and= onto. the property along . the west _boundary. The runoff will then flow
northwest to the ditch along the south side of Grier ' Road. The 100 -year
peak discharge rate .for basin #3 with the proposed developmentis '37 cfs.
p 9 P p
•
Hydrologic data sheets for basins #1, #2, and #3 are located in Appendix
B. The Pima County Hydrology Method was used to determine the peak
3
111.. ONSITE DRAINAGE PLAN
Runoff generated on the subject property: will be collected within a 32 -foot
jo wide street through the' center- of the. site (see Figure 3) . The runoff.
generated by 'basin #2 v)ill 'flow east: along the .onsite street and into the
ditch along Sandario Road,. as described above in Section 11. The depth
of flow for the onsite street at cross-section A -A' is 0.53 for the 100 -year
' event.
Runoff generated by basin. #3 will be collected within the onsite street and
carried west to the property line where' it is discharged onto the adjacent
property, as described in Section II.: The depth in the street at
' cross-section B -B' for the 100 -year event is_.0.63 feet. The owner of the
subject property has a written agreement with the adjoining property
' owner to the west to accept runoff from this development.
p
Runoff within the 'ditch will not spill over onto the subject property. The
100 -year peak discharge rate for flow within the ditch along Sandario Road
is 105 cfs (runoff from basins #1 and #2) Hydraulic 'computations de-
termined that the ditch has the capacity to this runoff without
p Y carry
' spillover •onto the site. However; spillover onto Sandario Road will occur
for the 100 -:year event (see hydraulic computations for cross-section C -C'
' located in Appendix B) . The depth of flow at cross-section C -C' is 2.0
feet.
' The proposed minimum finished floor elevations shown on Figure 3 are one
foot above the 100 -year- water surface elevation for the Santa Cruz River.
The water surface elevations used are from the updated FEMA Flood
6
D�.ID
---------------
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Insurance Study for the Santa` Cruz , River. Figure 4 shows a portion of
the FEMA study maps for the -area surrounding the subject property. The
water surface elevations..- shown are ,for ,the 100 -year event. The ' proposed
'
12
finished floor elevations are at least feet above the flowline of the Santa
'
Cruz as required by the current Town of Marana Floodplain Ordinance.
Flowline elevations for the Santa Cruz River at each cross-section are also
shown on Figure 4 of this report. ,Additionally, it should be noted that
'
the, proposed minimum. finished floor elevations are one, foot above the
depth of flown within the onsite . street and adjacent ditch.
•,
8
' F.. A S T
March, 6,:: 1988"'..
:.' Mr John Oder ;
9345 Paseo Tie:rra.Verde
.Tucson, ,AZ. 85749,,.
RE Report for Marana Gardens
Archaeolo .
gical _E�:pl"oration '(PAST: Job No. 881691,
Dear -Mr-..Oder
Archaeologists .from P. A. S.T. conducted 'a .5 personday, 10 acre
exploration'..of:,the Marana"Gardens r"property on Mar -ch 6;:198,this
exploration consisted of an intensive "on -foot coverage. of :the
proper.._ty` by our 'staff in order .to . identify and lo.ca't.e any' •
cultural resources, historic or prehistoric,'within`the property
'.boundaries.: ('see attached .'documents'). Field:,:personnel (D.
Stephen) were spaced 15 to 20 meters apart and crossed the
subject property an 'a `series. of ;contiguous 'corridors. General:
conditions were excellent ':for.. conducting the ,fieldwork,:. ,.-Gr.ound.
visibility, was. severely effected by disturbances to the ground.
surface,. the.* presence of trees, "shrubs., semi -shrubs:,. succulents
and ,grasaes There ",were no surface - indications'. of signi'fcant
archaeological, materials on the property.,,. Records at the Arizona.
=`State 'Museum were''also-checked..-for-the subject property
' I recommend , that .the ,proposed dev.el"opni1. ent related activities .may''
...�be.gin on thesubject propert.v : Based .on the f field, methods
employed and the -observablesurface indicati,ons.,.there is: note
' sufficient -evidence o warrant•.furt.her..archaeologica-1 s.tudies•,on "
the Marana Gardens property. However,. this.: 'does 'not preclude
the poss;ibility. 'that.- ground disturbing .: activities could. reveal
'. the presence of cultural:resources. In the unlikely event such
`materials are';: discovered, :construction activities should cease
and .a • professional archaeologist bre consulted to assess the
'potential" significance of `any 'artifacts -or features unearthed.
If J -may be of any further' assistance please d ' not hesitate to
contact me.
i
Cheers,
David V. M Stephen
Archaeologist'
encl.
^PAST !fle.-hGr:e
r\rctiaeviog s's 5035 Gnder Rarnch Rr: 160 2) i ^'_r?^.
Tucson, Arizona
tow
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