HomeMy WebLinkAboutDrainage Reports - 12/16/1994I
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December 2, 1994
Mr. Glen Schlueter
City of Fort Collins
Stormwater Utility
235 Mathews Street
Fort Collins, CO 80522
Re: Preliminary/Final Drainage and Erosion Control Study
for Taco John's International, Inc.
Project No. 10-796-000
Dear Glen:
We are pleased to submit to you, for your review and approval, this Preliminary/Final Drainage
and Erosion Control Study for Taco John's restaurant. All computations within this report have
been completed in compliance with the City of Fort Collins Storm Drainage Design Criteria.
With this study we are also requesting a variance requesting the use of sand bags versus a silt
fence. We feel that the use of sand bags will be better suited in this situation. Due to the fact
that the general public will still be utilizing the remaining parking lot and we feel that we can
control sedimentation runoff better with the sand bags.
We appreciate your time and consideration in reviewing this submittal. Please call if you have
any questions.
Respectfully,
TST, INC., CONSULTING ENGINEERS
Richard A. Dvorak
' RAD/lg
' Enclosure
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TST INC.748
Whalers Way-BuildingD
' 7
Consulting Engineers
Fort Collins, CO 80525
(303) 226-0557
Metro Denver (303) 595-9103
Fax (303) 226-0204
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Donald N. Taranto, P.E.
102 Inverness Terrace East
Suite 105
Englewood, CO 80112
(303)792-0557
Fax (303) 792-9489
lt�to
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GENERAL LOCATION AND DESCRIPTION
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B.
Location
The proposed restaurant Taco John's is to be located midway between South
College Avenue and J.F.K. Parkway on the North side of West Horsetooth Road
in the commercial shopping mall, "The Square". The site is shown on the
Vicinity Map in the Appendix. More particularly, the proposed development is
located in the Southwest Quarter of Section 25, Township 7 North, Range 69
West of the Sixth P.M., Larimer County, Colorado.
Description of Property
The site for Taco John's contains approximately 0.34 acres of area that is
currently a part of the paved parking lot for the shopping mall "The Square". The
property is bounded on the North by existing shopping center buildings, the East
by additional parking lot, the South by West Horsetooth Road, and the West by
an entrance drive to the mall. The existing parking lot will remain in place except
for the area of the building. The site generally slopes downward from the
Southwest to the Northeast at approximately 3 percent grade.
DRAINAGE BASINS
A.
B.
Major Basin Description
The site is located in the Foothills Basin. This drainage area is shown on a map
in the Appendix taken from a Stormwater Management Model (SWMM) study by
Resource Consultants, Inc.
Sub -Basin Description
Existing developed drainage patterns for the site are Northeasterly. Runoff flows
offsite along the South side of "The Square". Flows from "The Square" enter an
offsite storm sewer on J.F.K. Parkway that carries it to Warren Lake. Sub -basin
1 incorporates the entire site. This report addresses no other off -site runoff. The
proposed development was considered in the planning of "The Square" and
detention requirements were satisfied for the entire site via an agreement with
Warren Lake Reservoir (see Appendix).
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' III. DRAINAGE DESIGN CRITERIA
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A. Regulations
All regulations as established by the City of Fort Collins Stormwater Utility will
be used for this drainage study.
B. Development Criteria Reference and Constraints
Drainage criteria are in accordance with the City of Fort Collins Storm Drainage
Design Criteria and Construction Manual. On -site detention is not required for
the site. The impervious area of the site would not change from the existing
conditions of 0.34 acres. Therefore, existing off -site drainage patterns will not
be adversely effected at all. Flow patterns proposed for the site will remain
nearly the same as for the existing conditions. The only exception is that runoff
from the South or West side of the proposed building will be interrupted by the
drive through lane which conveys it around the building.
C. Hydrological Criteria
The rational method was used to determine the peak runoff peak from the site.
The 10 and 100 year rainfall criteria, which was obtained from the City of Fort
Collins, is the criteria which was utilized for this study. The calculations are
included in the Appendix.
D. Hydraulic Criteria
All calculations within this study have been prepared in accordance with the City
of Fort Collins Storm Drainage Criteria.
DRAINAGE FACILITY DESIGN
A. General Concept
As construction on the site progresses, the drainage and erosion control concept
shown on the Grading, Drainage, and Erosion Control Plan, in the back pocket
of this report, should be followed.
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' B. Specific Details
' If ground water is encountered during construction, a Colorado Department of
Health Construction Dewatering Permit will be required.
The site has adequate elevation relief to provide for surface drainage. Runoff will
flow generally from the Southwest corner of the site. It would flow around the
proposed building and across the parking lot to converge at the Northeast corner
' of the site.
' V. STORMWATER QUALITY
A. General Concept
' Beginning in October of 1992, the water quality of stormwater runoff was
required to be addressed on all Final Design Utility Plans. The Taco John's
development is anticipating construction beginning in 1995. Therefore, for this
study, we have sought to find various Best Management Practices for the
treatment of stormwater runoff.
' B. Specific Details
' It is our understanding that, for this site, stormwater quality should address the
prevention of contamination of runoff. This can be accomplished during the daily
' operation of the restaurant itself. Since most of the site is paved parking sediment
control is not going to be a problem, but the Owner should address operational
procedures for pollution control and keeping the area trash free.
' VI. EROSION CONTROL
' A. General Concept
Taco John's lies within the Moderate Rainfall Erodibility Zone and the Moderate
Wind Erodibility Zone according to the City of Fort Collins zone maps. The City
of Fort Collins Erosion Control Reference Manual for Construction Sites specifies
that the erosion control performance standard will need to be calculated and
appropriate measures taken to control erosion from the site. Erosion control
features are shown on the Drainage, Grading, and Erosion Control Plan. A
sandbag barrier will be the.main erosion control measure used during construction
to temporarily detain runoff to allow settling of sediment.
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tWe are anticipating a total construction period of approximately four (4) months.
However, we are recommending the construction will follow the following
' sequence; the existing asphalt will be saw or wheel cut per our Grading Plan, but
only the asphalt will be removed, and the existing base course will remain in place
except for the area of the actual building location. Therefore, if you will, the
entire site will have a "Gravel Mulch" protection. We have designed the proposed
parking island to match the existing parking lot. Therefore, we foresee minimal
disturbances of the site. Actual excavation for the concrete curb and gutter will
' only occur as new concrete will be placed. We are recommending the additional
placement of sand bags around the North and East part of the construction area
to prevent sediment from entering the existing catch basin (18" square).
' Therefore, we feel a variance is still needed for the placement of the sandbags.
The erosion control performance standard and efficiency for the site during
construction with the gravel mulch is shown in the calculations in the Appendix.
All construction activities must also comply with the State of Colorado permitting
process for Stormwater Discharges Associated with Construction Activity. A
' Colorado Department of Health NPDES Permit will be required before any
construction grading can begin.
' VII. CONCLUSIONS
'
A. Compliance with Standards
All computations within this report have been completed in compliance with the
'
City of Fort Collins Storm Drainage Design Criteria.
'
B. Drainage Concept
The drainage of stormwater runoff from the site will not change the construction
'
of Taco John's restaurant. The previous drainage plan for "The Square"
adequately handles the runoff for the existing site, therefore, no site detention nor
additional drainage structures are required.
'
If groundwater is encountered during the construction of any portion of the site
and dewatering is used to install utilities, then a State of Colorado Construction
Dewatering Wastewater Discharge Permit will be required in order for this water
'
to be discharged into any waters of the United States.
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' C. Stormwater Quality
' Because stormwater quality has become a requirement, the site will need to
address this stormwater aspect. After construction, the Owner of the restaurant
will have to be responsible for keeping the site clean so that runoff is not polluted.
' D. Erosion Control Concept
t Appropriate erosion control measures and calculations of the overall performance
standard for the site have been completed according to the City of Fort Collins
Erosion Control Reference Manual for Construction Sites.
REFERENCES:
' 1. Storm Drainage Design Criteria and Construction Standards, by the City of Fort
Collins, Colorado, May 1984, revised March 1991.
' 2. Erosion Control Reference Manual for Construction Sites, by the City of Fort
Collins, Colorado, January, 1991.
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APPENDIX:'
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®Consulting INC.
Clting Engineers OPINION OF COST
°QT C�lLINS C.DL,O.
. MoAJi�oe AV.
VICINITY: MAP
U-1161
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12�' STORM SEWER FcoT-4.I L,L,
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TARANTO, STANTON & TAGGE
Consulting Engineers
CLIENT \ Ot- C. it `
JOB NO. t V - -I q_c, - Od (z>
PROJECT TO V J�'1
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MADE BY Q „�
DATE Z- -C1
CHECKED BYDATE
SHEET OF
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'c CONSTEUCTION SEQUENCE
PROJECT: Ta e o 2 ��. c c oL " "jS9C^-G-r-+-
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sLQUENCE. FOR 19 95 ONLY COMPLETED BY: VVv —qC>
STANDARD FORM C
DATE: e-Zl1C�w
Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
YEAR qq5
______________________MONTH_�pc� �'c\,,J. 1Y�
----------------- -----------------------------------------
OVERLOT GRADING I
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional.Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettin s/Mats/Blankets
9
Other
---------------------------- I------- ----------- t----------------------------------------
' STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
MAINTAINED BY
APPROVED BY CITY OF FORT COLLINS ON
1
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RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------`-�-------------------------------------------I
PROJECT : To- , oh n'r o} —[1.� Sod e a c STANDARD FORM A I
COMPLETED BY: DATE: 9/21 f9y l
---------------------------------------------------------------------
OEVELOPEDIERODIBILITYI Asb I Lsb I Ssb I Lb I Sb I PS
SUBBASIN I ZONE I (ac) I (ft) I (0) .I(feet) I (o) 1 (a) I
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IYYIocose.A4-1 o.3w I 18?v I 3. o I i »v I 3. o I t3• 4
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DI/SF-A:1989
TARANTO, STANTON & TAGGE
Consulting Engineers \ /
CLIENT _I Q G c7 \� J V� vim.. 1 JOB�NNO.
' PROJEC77 Cti C .J `•' O N r--' S �a_ 4% It -It` CALCULATIONS FOR
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tJ.AACH 1991
2-4
DESIGN CRITERIA
a
Table SB C-Factors and ?-Factors for Evaluating EFF Values.
' Treatment C-Factor P-Factor
' BARE SOIL o............................................................... 1.00 1.00
Packed and smooth
Freshly disked . ... 1.00 0.90
Rough irregular surface........................................................... 1.00 0.90
SEDIMENT BASINITRAP................................................................. 1.00 O.SO"i
'
STRAW BALE FARRIER GRAVEL FILTER SAND SAG ................... 1.00 0.80
' SILT FENCE BARRIER ............................... :..................................... 1.00 0.50
PHALT CONCRETE PAVEI�ENT................................................... 0.01 1.00
' ESTABLISHED DRY LAND (NATIVE) GRASS .......................... See Fig. 8-A 1.00
n
0
SODGRASS................................................................................. 0.01
1.00
TEMPORARY VEGETATION/COVER CROPS .................................... 0.451.1
1.00
HYDRAULIC MULCH @ 2 TONS/ACRE........................................... 0.10" 1
1.00
1.00
SOIL SEALANT....................................................................0.01-0.60"'
EROSION CONTROL MATS/BLANKETS......................................:..... 0.10
1.00
GRAVEL MULCH
Mulch shall consist of gravel having a diameter of approximately
1 4" to 1 1/2" and z lied at a rate of at least 135 tons/acre.............. 0.05
1.00
HAY OR STRAW DRY IJ,ULCH
After planting oress seed, apply mulch at a rate of 2 tons/acre (minimum) and adequately
anchor,
tack or crimp material into the soil.
Slooe (961
1 to 05
1.00
.............................................................................0.06
0.06
1.00
6 to 10...........................................................................
0.07
1.00
11 to 15............................................................................
0.11
1.00
16 to 20........................................... ......... .........................
0.14
1.00
21 to 25..................................................... ....... ..................
0.17
1.00
25 to 33.............................................................................
0.20
1.00
> 33..........................................................................
NOTE: Use of cr;her C-Factor or P-Factor v<I,es rponed in this zb'e must be submriat ed by &, urwnta-ion.
(1) Must be constructed as the first step in overlot grading.
(2) Assumes planting by dates identified in Table 11-4, thus dry or hydraulic mulches are not required.
(3) Hydraulic mulches shall be used only between March 15 and May 15 unless irrigated.
(4) Value used must be substantiated by documentation.
MARCH ISSI
8.6
DESIGN CRITERIA
' RCPTN J 85034305 67 16 85 11:21.45 9 OF PAGES
- 4 FEE -
J. ULVANG, RECORDER /LARIMER COUNTY, CO. DOC. FEE- $:00
' A G R E E M E N T'
' THIS AGREEMENT made and entered into this o`S day of January,
by and between
' HCI, I::C.,
a Colorado corporation,
hereinafter designated as the "applicant", and
' THE WARREN LAKE RESERVOIR COMPANY,
a Colorado mutual irrigation corporation,
' hereinafter designated as "reservoir company...
PROJECT:
Construction of a shopping center development located east
of College Avenue and south of East Monroe Drive and north of
' -o rsetooth Road, in the City of Fort Collins, County of Larimer,
IState of Colorado.
' WITNESSETH:
IWHEREAS, reservoir company is the owner of a reservoir
k-ewn as Warren Lake, and such•comparty is presently being required
by the office of the State Engineer of the State of Colorado to
a%e'certain changes and improvements, including but not limited
'tc the erectic. of a s?illway, to comply with State law and the
regziations of the office of the State Engineer; and
' WHEREAS, the shopping center being developed by applicant
will increase the volume of•flow of water within a given period
of tire into this reservoir, thereby requiring additional expenses
to the reservoir in meeting the requirements of the State Engineer's
Office; and
tir!ER_'n5, the parties hereto deem it mutually advantageous
to have applicant assist reservoir company in the expense of the
above referred to improvements rather than the erection of detention
retention ponds for the orderly discharge of waters from such
de':eloprent.
::Ot•:, TyER MORE, in consideration of the premises and the
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IF
_ benefit to the parties herein, it is agreed as follaws:
1. Reservoir company shall accept the quantity and
c.` •water to be discharged from the shopping center area and the
:an'_s to the east thereof, presently owned by ELMER L. BRUNE and
J. BRUNE, (the lands of applicant and the Brunes involve::
`e:ei- consisting of twenty-five (25) acres, more or less), dsvelc;:ee
cr tc be developed by applicant and others, through natural channels
now existing without intervention of detention or retention ponds or
other retardent procedures.
2: Applicant agrees to pay to reservoir company not less
than Six Thousand and No/100 ($6,000.00) Dollars nor more than
:1:elve Thousand One Hundred Fifty and No/100 ($12,150.00) Dollars
u=en the following terms and conditions:
•(a) Applicant shall pay. the sum of Four Thousand and No/100
(S4,000.00) Dollars to reservoir company at the time of the execution
of this agreement and a minimum of Two Thousand and No/100 ($2,000.00)
Dcl'_ars more after the' cost of the spillway contemplated above is
determined by reservoir company. The basis of payment. to reservoir
company by applicant shall be 8.11 of the total cost of said spillway
:c reservoir company up to a total spillway cost of One Hundred Fifty
'`c_sand and S.o/100 ($150,000.00) Dollars, with a minimum payment c`_
Si>: -.cusand and No/100 ($6,000.00) Dollars. Applicant's total cash
obligation shall not exceed Twelve Thousand One Hundred Fifty and
::c/1:^ ($12,150.00) Dollars.
J. It is understood and agreed that there is a possibility
the future of governmental bodies, either City, County, State or
Federal, imposing quality controls on water discharge; and it is
s=ecifically understood and agreed that this agreement does not
relieve either party hereto nor determine the responsibility for
_ater cuality now or in the future. Reservoir company does not
ass,•_e'ary obligations for the quality of water being accepted
_nder.the terms of this agreement and reserves the right to pass
en to applicant, its successors or assigns, any water quality
standards which r..z;• later be _:aposed upon the water beir_
�i
�..�^!.Y f.r1 :i�4 w. L 4 •� .•.
THIS AGREEMENT shall extend to and be binding upon the
successors and assigns of the respective parties hereto.
It: WITNESS WHEREOF, the parties hereto have caused this
a=ree-.ent to be, signed the day and year first hereinabove written.
(SEAL)
ATTEST.:. -/ �A'
K AIL--
- L7- $eCte Cary
(SEAL)
ATTEST:
William t6-vit ecretary
STATE OF COLORADO )
) ss.
County of Larimer )
HCI, INC.,
a Col s ao Corp oratio , /
ugen rii c e , resi ent
THE WARREfl LAKE RESERVOIR COMPANY,
a Color o mutual irrigation corporat
By:'
Glen A. JohKsoh# Presl ent
The above and foregoing instrument was, acknowledged before
-e this a5 r day of January, 1978, by EUGENE E. MITCHELL, as Presider
and attestec to by JACK A. SHIREY , as ' Secretary "' , of HCI, I:
a Colorado corporation.
Witness my hand and official seal.
My Commission Expires: 'August's; 1979.
Notary Public
STATE OF COLORADO )
) ss.
County of Larimer )
The above and foregoing instrument was acknowledged before
me this .?•:%^day of January, 1978, by GLEN A.'JOHNSON,.as President,
and attests to by WILLIAM C. STOVER, as Secretary, of THE WARREN
LARS RESERVOIR COMPANY, a Colorado mutual irrigation corporation.
Witness ny hand and official seal.
My Co -Mission Expires: (.y Commission Expires September 28, 1960
Notary P ubl is
...,
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CAI
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Parcel•for January 25.SecondAFilre ing,_.Fort Collins, Larimer
Strachan.Subdivis�on,__.__ point on .the tlorth line '
1`ounty, Colorado which begins at a p
of East Road which bears 11 89° 45' 30" E 111.80
45*
lily.:"`feet. and again N 000 27' 15" W 31.62 feet and again c io
34! 15" W 26.14 feet from the South-west corner of Section
25,*Township 7 North, Range 69 West of the 6th P.1'. and
run thence H 450.34' 15" W 44.78 feet;'thence N 00° 24'
51B.67.feet'. thence S 89° 02' E 749.75 feet to a
45" W
:.point 1,the East line of said Lot 1; thence along the
'said East line along the arc of a 554.77 foot radius curve
to the left a distance of 123.04,feet, the long chord of.,
which bears S 16 44' -28" E 122.78*feet and again.S 23 .
05' 40" E 1.14.42'feet and again along the arc of a 400.00
~^ foot radius curve to the right a distance of 159.54 feet,
s� the long chord of which bears S 11° 40' 05" E 158.49 feet
,..
�' and agan 5.00° 14' 30" E 140.83 feet; thence along the
i 0i,
i
416 arc of 15.00 foot radius curve to the right a distance o
��A, 23.56 feet; the long chord of which bears S 440 45' 30" W
{..: '.21.21'feet; thence S 89°.45' 30" W 811.90 feet to the point
wYi of beginning A110.ALSO a part of Lot 3,'Strachan Subdivision.
Third Filing, Fort CoTlTns, Lorimer oun y, o ora o �: c
3 egtns.a �e outhwest corner of Lot 2, Strachan Subdivision,
Third Filing and run thence N 85° 18' E 58.78 feet; thence
H 89° 45' 30" E 192.00 feet; thence N 44° 45' 30': E 312.00
feet; thence S 890 21' 50" E 203.60 feet; thence•N_ E 215,heefee
t;
45'•30" E •153.64 feet; thence S 45° 14' 30"
thence 11 89° 45 E feet; thence S 00° 14''•30" E '
233.05 feet; thencece alongng the- arc of a 298.80 foot radius
curvg'to the right a distance of 198.17 feet,
the long chord
of which bears'S 18° 45' 30" W 194.56 feet;.thence along
the arc of.a 376.90 foot radius curve to the left•a distance
of 249.90 feet, the long chord of which bears S 18° 45' 30" W
245.35 feet; thence along the arc of a 15.00 foot radius
curve to the right a distance of 23.56 feet, the tong chord•_
of which bears S 440 45' 30" W 21.21 feet; thence s 891oot radius
45
30" W 762.30 feet; thence along
the arc ofcurve to the right a distance of 23.56 feet, the long chord
of which bears H 450 14' 30".Wy21.21rc of feet;
thence
110061 foot radius* 30" W
140.63 feet; thence along the
curve to the left a distance of 139.05 feet, the long chord
40' 05"W3f thence O
of *which bear H 111°along thear 1 of 488.77foot radiuscurve1' W
q stan 4 fleet to the point of beginning , containing
the right a distance'of 156.92 feet. the long chord of which bears
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