HomeMy WebLinkAboutMarana Gardens Specific PlanMARANA GARDENS �'
SPECIFIC PLAN
The south 330 feet of the north 695 feet
of the NE 4 NE4, Section 28, T 11 S,
R 11 E in the Town of Marana, Pima County,
Arizona.
March 1988
Prepared For:
MARANA INTERNATIONAL DEVELOPMENT C0.
P.O. Box 848
�Zarana, Arizona
85238
Prepared By:
John B. Oder P.E.
9345 Paseo Tierra Verde
Tucson, Arizona 85749
880301
ORDINANCE NO. 88.10
AN ORDINANCE OF THE TOWN COUNCIL
OF THE TOWN OF MARANA, ARIZONA ADOPTING
A SPECIFIC PLAN FORT HE MARANA GARDENS PROPERT~
WHEREAS, the Planning Commission of the Town of Marana,
after a public hearing, has recommended approval of a Specific
Plan as submitted by the Marana International Development Company
for lands owned by it within the corporate limits of the Town of
Marana; and
WHEREAS, the Marana Town Council has held a public
hearing with respect to the Specific Plan submitted by the Marana
International Development Company ; and
WHEREAS, the Marana Town Council desires to maintain
its proper role in shaping future development within its existing
boundaries; and
WHEREAS, the Marana Town Council has determined that
the Specific Plan submitted by the Mararia International
Development Company is desirable for the continued development
of the Town of Marana; and
WHEREAS, the requirements of A.R.S. Section 9-461.09
have been complied with.
NOW, THEREFORE, BE IT ORDAINED that the Town Council of
the Town of Marana, Arizona does hereby adopt the Specific Plan
proposed by the Marana International Development Company as more
fully set forth in that document entitled "Marana Gardens
Specific Plan", dated March 1988, which Plan shall be forthwith
a public document of the Town; and
IT IS FURTHER ORDAINED that any violation of this
Ordinance and the failure to comply with the Specific Plan it
incorporates, shall be deemed a class I misdemeanor, and that
each day that a violation continues shall be deemed a separate
offense.
PASSED ADOPTED AND APPROVED by the Town Council
the Town of Mararia, Arizona this 3rd day of May, 1988.
ATTEST:
of
APPROVED AS TO FORM:
REVIEWED BY:
T WN AT~
MANRANA GARDENS SPECIFIC PLAN
PART ONE: DEVELOPMENT CAPABILITY REPORT
GENERAL DISCUSSION
MAP OF THE TOWN OF MARANA
SPHERE OF INFLUENCE MAP
LAND FORM / OPEN SPACE MAP
TOPOGRAPHY AND SLOPE ANALYSIS
HYDROLOGY AND WATER RESOURCES
TOPOGRAPHIC MAP
WATER RESOURCES MAP
VEGETATION AND WILDLIFE HABITAT
GEOLOGY AND SOILS
PALEONTOLOGY AND CULTURAL RESOURCES
EXISTIIvTG STRUCTURES
EXISTING INFRASTRUCTURE
PART TWO: SPECIFIC PLAN
OBJECTIVES
PROPOSED USE
ZONAL LAND USE MAP
ZONAL INTENSITY MAP
EXISTING LAND USE MAP
AREA MAP
SURROUNDING STRUCTURES
SPECIFIC PLAN IMPLEMENTATION AND AUTHORITY
REGULATIONS AND PRQGRAMS FOR IMPLEMENTATION
PROCEDURE FOR AMEPIDMENTS
1
3
4
5
6
6
7
8
9
9
1U
10
10
16
16
18
19
ZO
21
22
23
24
25
LAND USE AND RESTRICTIONS
HYDROLOGY
CIRCULATION PLAN
FUTURE CIRCULATION PLAN
CIRCULATION MAP
UTILITY PLAN
LANDSCAPE PLAN
OPEN SPACE
SURVEY MAP AND LEGAL DESCRIPTION
APPENDIX
DRAINAGE REPORT
ARCHAEOLOGICAL REPORT
26
27
27
28
29
30
31
31
32
rIARANA GARDENS SPECIFIC 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
the property and thus providing the Town of Marana, the
Town Council, the Planning Commission and all other con-
cerned citizens the needed infor�ation 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 1Q has an interchan�e 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.
1
GENERAL DISCUSSION (Continued)
Presently the Town is primarily agriculture in nature.
The adoption of the TOWN OF MARANA 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.
The Town of Marana General Plan shows the subject property
within zone G with a zone intensity l, 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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l. �6POG$9P�Y AND SLOPE ANALYSIS
The Marana Gardens Specific Plan Area is located on the
west side of Sandario Road and south of Grier Road. The
area lies between an apartment complex and primarily
vacant land to the north and a trailer park to the south.
The topography of the site is uniform and sloping only
slightly from east to west.
The site has been farmed for many years although not
under cultivation at this time.
The elevation along the westerly edge of the property
is 1980. The elevation along the easterly edge of the
property is 1982. This yields an average cross slope
of .0016 feet per foot.
To provide site drainage for development purposed and
to insure against flooding,the center of the property
will have to be raised. This will provide a more pleasing
rolling appearance to the Terrain.
2. HYDROLOGY AND WATER RESOURCES
See drainage report by CMG Drainage Engineering included.
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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 Greer 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.
Al1 adjacent lands and this site have long been devoid
of native vegetation and wild life habi'tat.
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-swel�
characteristics.
9
GEOLOGY AND SOILS (Continued)
Soils af 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)
RESOURCES
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.
10
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 andfinancial
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.
11
' t �,
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W���;�x�x I
x' �' y
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�RIZO�
PIMA COUNTY
WASTEWATER MANAGEMENT DEPARTMENT
130 tiNEST CONGRESS
TUCSON. ARIZ�?NA A5'O1
GEORGE A. BRINSKO
Director
February 10, 1988
PH:i92-8076
Mr. John B. Oder, P.E.
9345 Paseo Tierra Verde
Tucson, Arizona 85749
RE: Marana Gardens Bevelopment
Public Sanitary Sewerage Service
Dear Mr. O�ler:
In response to your letter of January 27, 1988, where'in you requested this
Department's conditions/requirements for the noted Subdivision achieving
public sanitary sewerage service, I offer the Eollowing comments:
l. 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 TMlarana area.
2. A preliminary analysis of the drainage basin indicates that one or
more of the existing public wastewater pumping systems (tn1�iPS) 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 oE
the owner or developer; without reimbursPment from Pima County_
3. In addition, the existing public wastewater treatment facility docs
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 oE
an existing puhlic wastewater treatment faci].ity should be accom-
plished by the County through its Capital Improvement Program (CIP) -
utilizing funds Erom the wastewater Management Construction Fund.
When the need Eor 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.
12
Mr. John B. Oder, P.E_
February 10, 1988
Page -2-
The current GIP calls for the Marana �,aWTF to be expanded/relocated in
FY 1988-89. Because the present site for the Marana wWTF is neither
appropriate for a large(r) facility, nor is it positioned within the
overall basin so as to provide maximum benefit to the Town of Marana,
��e are quite reluctant to utilize bond funds to enlarge - even on an
interim basis - the Marana facility at its current location. Hence,
it is quite doubtful that additional capacity could be made available
for projects such as Marana Gardens in the near future.
With the above noted information taken into consideration (and if
Marana Gardens desires to connect to the system prior to the comple-
tion of the above referenced CIP project), we would require that the
owner/developer of Marana Gardens plan, design, front-end finance,
acquire any required permits and construct improvements to the exist-
ing �TwTF - 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 w�n�TF would be eligible for sewer connec-
tion fee credits.
4. Wastewater Management, through its Capital Improvement Program, will
strive (with the support/assistance of the Town of Marana) to have
the Pirst �hase of a new regional �T6JTF (and the initial segments of
the associated influent interceptor/trunk sewers) ready for service
in mid-1989.
5. In the event that the owner/developer of Marana Gardens would desire
to connect up to twenty-five (?_5) of the project's first housing
units into the existing Marana WwTF -�rior 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 following forms - would need to be
provided to wastewater Management:
A. A Third Party Trust Assurance Agreement, in the same format �s
the Pima County Assurance Agreement, modified to reflect Town of
Marana, as appropriate, or
B. A CertiEicats oE Deposit at a local bank, or
C. A Construction Bon� for the Marana WWTF interim improvements,
with appr.opriate instructions, or
D. A Letter of Credit for the Marana WWTF i.nterim improvements, with
a�propriate instructions.
�ord of Cautian The more sewage that is placed into the existing
��WTF, prior to commencing the required interim improvements; the more
difficult (and costly) it may become to actually accomplish the
involved improve��ents!
13
' �
I ' �
I' �
i
I,�
I ' �
Mr. John B. Oder, P.E.
February 10, 1988
Page -3-
6. To summarize:
The following issues/items must be resolved before any building permits
are issued by the Town of Marana for units within Marana Gardens:
A. The owner/developer shall prepare approvable (by PCWWMD) Con-
struction Documents for the required public sanitary sewage '
conveyance Eacilities - including any necessary augmentation of
the downstream publ.i.r ���astecaater pumpi_ng system(s). _
B. The owner/developer shall prepare approvable (by PCWWMD, ADEQ and
PCDOT & FCD) Construction Documents for the required "interim"
improvements to the existing Marana WWTF; and the associated
financial assurances, as described above in Section 5.
C. A formal Sewer Service Agreement (SSA) must be consummated
between the owner/developer and Pima County (or their authorized
agent) for the project, as a��hole or in phases.
It should be noted here that the owner/developer (or kheir authorized agent)
will have to agply 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 Tr1wTF - all priar 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 lyi.ng 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
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 lying southerly of I-10 (such as the
system(s) to which Marana Gardens will be tributary) is still unknown. It is
cottceivable 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.
� � �-
1 ��
Richard G. Harrington, .E., R.L.S.
Chief Engineer
xcx:hlb
xc: G�orge A. Brinsko
Ray Teran
,7on C. Schladweiler
Mark R. Stratton
Jerry B. stratton
14
Febru�y 16, 1988
Richard G. Harrington P.E,,R.L.S.
Chief Engineer
Pima County Wastewater Management Depart�nt
130 West Congress
Tucson, Arizona 85701
RE: Marana Gardens Subdivision NL12-87-1
Public Sanitaiy Sewage Service
L�� "^s. u.a.�� �r.:
'Ihis letter is to confix�t my vnderstanding of the results of our meeting
on Februaiy 12, 19 8 8.
'Ihe s�abdivis�,on wi11 consist of forty-six (46) single family detached
dwelling units .
Standard sanitaty sewer collection plan with the associated approvals
and pernrits are required for the subdivision.
Wastewater Manag�ment has schec"i�led upgrading of the dawnstream p�ing
facilities so it is therefore un7,ikely that any additional p�nping augmenta-
tion wi11 be reqla.ired.
Interim i�rovetrents to the existing Marana WG+TI.�' will be required. The
Art Beard Engineers Design Report clated Januaiy, 1987, will be used to
evaluate the needed interim in�raven�nts. A s�plim�ntal design report based
on the A.B.E. Report if required.
'Itaenty-five housing units will be allaaed connections prior to the comple-
tion of any interim WW1� providing the plans hav�e been approved and the as-
s�an.ces have �en posted to cover the construction cost.
A Flood Plain use permit and a sewer service agreerr�nt is required.
.If all of the above stat�ments are correct, no response to this letter
is requested. If not, please 1et � knaw as soon as possible.
Very Truly Yours,
• O��L.
John B. Oder P.E.
,TO/mj 1 15
MARANA GARDENS SPECIFIC PLAN
PART TWO: SPECIFIC PLAN
OBJECTIVES
The objectives of the Marana Garden Specific Plan is to:
a. Provide a point of beginning for residential and
ultimately other types of growth radiating out from
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.
d. Provide flood protection for this area.
PROPOSED USE
The land use proposed by the Marar.a Gardens Specific Plan
is single family detached residential. The Marana General
Plan designates Zone G with a zone intensity of l, a xes-
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
ranoe. The Marana General Plan does not specify lot size,
however to achieve the recommended density small lots or
16
PROPOSED USE (Continued)
Multiple family units will be required.
The surrounding neighborhood is a composite of residential
tYPes.
On the east side of Sandario Road.are small single family
detached and mobile homes. To the north 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.
17
#
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, t AREA MAP ti]ITH SEWER LOCATI01�
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' • • . SUTtRDUNDI�IG STRUCTURES
• � . 1
• . . . . ' ' / ' . . . .
' , � ; 100 YEAR WATER SURFA ' (`���
'� . � , . • CONTOURS '�
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SPECIFIC PLAN IMPLEMENTATION AND AUTHORITY
The Marana Gardens Specific Plan has been prepared in
accordance with the Town of Marana Development Code
Ordinance 84.04 as amended by Ordinance 87.22 Section
05.06. SPECIFIC PLAN.
The permitted uses, density requirements, set backs
and other applicable regulations within a Specific
Plan Zone shall be those contained within the Specific
Plan adopted by the Marana Town Gouncil pertaining
to the land within that zone. �
The Planning and Zoning Administrator shall be responsible
for enforcement of this plan.
Before any permits may be issued within this specific
Plan Area, the Planning and Zoning Administrator shall
determine that the project is consistent with the
provisions of this Specific Plan.
23
REGULATIONS AND PRO�RA�S::F4R_THE_IM'PLEMENTATIQN:OF THE
SPECIFIC PLAN FOR MARANA GARDENS
The Marana General Plan shows the Specific Plan area in
Zone G near the Town Core. The General Plan does not
recommend lot sizes, however the residential densities
designated dictates the use of small lots.
The limited acreage involved in the Marana Gardens
Specific Plan allows for only a single development type
for this project.
In order to minimize any conflict between existing and
'� proposed land uses an opaque fence will be constructed
along the north and south boundaries of the property
', between this development and existing uses.
'� Drainage and flood control measures will be provided to
protect the proposed development and the surrounding area.
A circulation pattern will be established to provide
access to the lots within this development, the adjoining
property to the west and for future traffic circulation.
24
PROCEDURES FOR AMENDMENTS TO THIS SPECIFIC PLAN
,�
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The Specific Plan may be amended by submitting a written
application for amendment to the Planning and Zoning
Administrator. The application shall state the regulatian
or regulations that are to be amended and the affect such
ammendments will have on the remainder of the plan. All
Specific Plan amendments shall be in substantial
conformance with the intent of the original Specific Plan.
The Planning and Zoning Administrator shall refer the
amendment request with his recommendati'ons to the Planning
Commission for Public Hearing. The Planning Commission
shall make its recommendation to the Town Council. The
Town Council will act on the proposed amendments after
holding a Public Hearing on the 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
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LAND USES AND RESTRICTIONS
l. RESIDENTIAL - HOMES INTENDED FOR THE OCCUPANCY OF A SINGLE
FAMILY:
a. Home occupations: Customary home occupations where
,� no persons other than residents of the home are
employed and no mechanical equipment other than
, ordinary household devises are used.
�
b. Roomers and Boarders: The taking in of boarders
,� and rentin of rooms by the resident family.
g
2. Minimum lot area shall be 6,000 square feet.
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3. Minimum lot width shall be 60 feet.
4. Maximum building height shall be 24 feet and shall not
exceed two stories. A basement'shall not be considered
a story.
5. Front and rear yard setbacks: The minimum setbacks shall
be equal to the height of the building or 20 feet which-
ever is greater.
6. Side yard: The side yard shall be a minimum of l0 feet
unless zero lot line construction is used. If the zero
lot line option is chosen the minimum distance between
buildings shall be 20 feet.
7. Parking: A minimum of two off street parking spaces,
not less than 8 feet wide and 20 feet long shall be
provided on each lot.
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LAND USE AND RESTRICTIONS (Continued)
8. Access: Access to each lot within this development
shall be from a publicly dedicated street.
�
Street improvements: The streets within this development
sha11 be constructed with a minimum roadway width of
30 feet of pavement, concrete curbs and gutters and
4 foot wide concrete sidewalks on each side of the
roadways. The sidewalks are to be constructed adjacent
to the back of the curbs. Sufficient right of way
is to be dedicated to provide for a11 of the proposed
roadway facilitites.
HYDROLOGY
A hydrology and drainage analysis is presented in the
included drainage report by CMG Drainage Engineering.
CIRCULATION PLAN
The small size of this project dictates that all const-
ruction be accomplished in a single phase.
Sandario Road which serves this project has adequate
capacity to handle the additional traffic generated by
this project. For ease of ingress and egress to the site
Sandario Road is to be widened to provide an acceleration
and deceleration lane. An additional 10 feet of right of
way is to be dedicated for Sandario Road.
Because of the setting street lighting is not proposed,
however should lighting be needed they may be added
without being construed as a change to this Specific Plan.
27
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1� T4WN OF MARANd4 � -� � :
A R I Z O N A
'� 29
UTILITY PLAN
Sanitary sewers will be constructed to Pima County
Wastewater Management standards. The sewers will be
maintained by Pima county.
Electrical service will be provided by Tucson Electric
Power Company.
Gas service will be provided by Southern Arizona Gas
Company.
Domestic water will be provided by Cortaro Water Users
Association.
Solid waste pick up will be by SCS Corporation.
The above services require service agreements and the
payment of the appropriate fees.
All utilities are to be underground.
30
1�
1�
I� LANDSCAPE PLAN
,� The front yards of each of the lots are to be landscaped
in a desert motif using low water consumption vegetation.
,�
OPEN SPACE
' _� h
The Speciflc Plan area is less than 10 acres. A cas
contribution will be made to the Town of Marana per
'� section 06.03.02 E of the Development Code.
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/,•'ESULTS CF � Jf? V'EY
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.' ° d t ��h'T/ON OF TflE /� :97ti'� 7 Ge�AFi'i �l�I c;/ : :, �-
2N ,�o/�T,Uf_�AST OUANTER '�CG7:";N 28 7�?�t: �"�l:�ir= ri
� �y Sovnl �aNGE // E,IST ��LA :�?�r qNF� �.�s� .'i ��; �
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LEGAL DFSCRIPTION:
I' �
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The south 330 feet of the North 695 feet of the
NE 4 NE 4, Section 28, T 11 S, R 11 E,GSR B&M.
I' � 3 2
DRAINAGE REPORT FOR
SANDARIO/GRIER PROPERTY
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
MARCH 9, 1988
TABLE OF CONTENTS
I. 1NTRODUCTION
II. HYDROLOGY
2.1 Offsite Hydrology
2.2 Onsite Hydrology
III. ONSITE DRAINAGE PLAN
LIST OF FIGURES
FIGURE 1 - LOCATION MAP
FIGURE 2- DRAINAGE BASIN BOUNDARY MAP
FIGURE 3 - SITE PLAN
FtGURE 4- FEMA STUDY MAP
Page
1
3
3
3
6
2
5
7
9
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, G�SRB�M,
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 Sandario Road between Grier Road and
Barnett Road. The property is planned as a housing development.
This report addressed tF�e offsite and onsite drainage which impacts upon
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
because it has been calibrated to small watersheds within Pima County.
Additionally, the Town of Marana is currently drafting a floodplain
ordinance which is somewhat 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 dzvelopment were
established based upon water surface elevations for a 100-year flood on the
Santa Cruz River of 70,000 cfs. The revised regulatory floodp(ain maps
have been reviewed and approved by the Town of Marana and wili 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.
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LOCATION MAP
SUBJECT PROPERTY
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II. HYDROLOGY
2.1 Offsite Hydrology
One offsite drainage basin impacts upon the subject property. This basin
.collects runoff from a Z0.8-acre area to the south and east of the subject
property. Runoff generated by basin #1 fiows north along Sandario Road
within a ditch along the west side of the road. The 100-year peak dis-
charge rate at C P#1, located at the southeast corner of the subject prop-
erty, 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.
Z.2 Onsite Hydrology
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 #2 will 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 atong the south side of Grier Road. The 100-year
peak discharge rate for basin #3 with the proposed development is 37 cfs.
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
discharge rates. Figure 2 of this report shows the basin boundaries for
basins #1, #2, and #3.
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Iil. ONSITE DRAINAGE PLAN
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Runoff generated on the subject property_ wiil be collected within a 32-foot
wide street through the center of the site (see Figure 3) . The runoff
generated by basin #2 will flow east along the onsite street and into the
ditch along Sandario Road, as described above in Section II. 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.
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 carry this runoff without
spillover onto the site. However, spillover onto Sandario Road will oceur
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
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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
finished floor elevations are at least 12 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 etevations are one foot above the
depth of flow within the onsite street and adjacent ditch.
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7ele(�hone
(602j 882-0297
March 6, 1988
Mr. John Oder
9345 Paseo Tierra Verde
Tucson, AZ. 85749
REs Report for Marana Gardens
Archaeological E�:ploration (PAST Job No.
Dear Mr. Oder:
:: .•
P A S T
Archaeologists from P.A.S.T. conducted a.5 personday, 10 acre
exploration of the Marana Gardens property on March 6, 198. This
exploration consisted of an intensive on-foot coverage of the
property bv our staff in order to identify and locate any
cultural resources, historic or prehistoric, within the property
boundaries (see attached documents}. Fi,eld personnel {D.
Stephenj were spaced 15 to 20 meters apart and crossed the
subject property in a series af contiguous corridors. General
conditions were excellent for conducting the fieldwork. Ground
visibility was severely effected by disturbances to the ground
surface, the presence of trees, shrubs, semi-shrubs, succulents
and grasses. There were no surface indications of significant
arch�eological materials on the property. Records at the Arizana
State Museum were also checked for the subject property.,
I recommend that the proposed development related activities may
begin on the subject property. Based on the field methods
employed and the observable surface indications, there is not
sufficient evidence to warrant further archaeological studies on
the Marana Gardens property. However, this does not preclude
the possibility 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 be consulted to assess the
potential significance of any artifacts or features unearthed.
If I may be of any further assistance please do not hesitate to
contact me.
Cheexs,
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David V. M. Stephen
Archaeologist
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Consultirg
Arthaeolog�sis
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PAS7
5C36 �older Ranch Rd
Tucson, Arizona
RS7 f f t A