HomeMy WebLinkAboutSite Certifications - 08/24/1994U. .. 1.
STEWART&ssocIATES
Consulting Engineers and Surveyors
August 19, 1994
Mr. Glen Schlueter
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Glen:
I have surveyed the as-buj-lt_dr_a-i.nage_facilities at the Schrader Country
Store on Lot 1 of rHorsetooth Commons_P.U_._D0located at the northwest corner
of Horsetooth Road —and Shields Street.
The as -built grades of the drain swale on the north side of the building,
the floor elevations, the area inlet and detention pond area, and the berms
are accurately shown in redline on the attached drainage and erosion control
plan. This plan was prepared by Advanced Professional Engineers, Inc.
The required 4-inch orfice plate is installed over the outlet pipe in
the area inlet. The area inlet grate was lowered 0.4 feet to provide positive
drainage along the east curb and drain pan to the grate.
I have calculated the volume of the detention pond to be 4767 cubic feet,
which is slightly more than the required volume of 4752 cubic feet per the
APEI report.
I inspected the site on August 18, 1994, and at that time the grading
was completed and the site was ready for landscaping and sodding.
I am attaching a copy of the APEI amended report along with a copy of
my calculations of the pond volume. Please call if you have any questions. q
Sincerely, �. , �esu5�,,,_
Phillip I. Robinson, P.E. & L.S. $ ��02
Vice. President
•,, ; A 3
j r r �. �P• ':• �. & m•'
enclosures
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
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F �K' WAJ-'t
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ADVANCED PROFESSIONAL ENGINEERING INC.
IE
E
III-GISIE'Rls1) PROFESSIONAL, CONSULTANT ENGINEERS ANI) LAND SURVE"YOR.S
P.O. 13OX 1391, FORT COLLINS, COLORADO 80522-1301 USA
PIIONG & FAX (303) 484-0533
torm water utility
ity of Fort Collins
/o Basel Hamadan
35 Mathews
ort Collins, CO 80525
May 18, 1994
ZZ''_ 33o6
Amended Drainage Report for the Gas Station at Horsetooth
Common Fort Collins, Colorado.
Dear Basel:
This is an amended letter to the drainage report for the proposed
gas station on Lot 1 of The Market At Horsetooth Commons P.U.D. a
Replat of Tract D of Horsetooth Commons PUD, in the City of Fort
Collins, State of colorado. Based on our meeting and phone
conversations concerning the grading plan for the gas station,
where the elevation of northern driveway at the east end is at
5,081.00 which is 6 inches below the high water elevation at
5,081.50. A change to the grade of the detention pond will
provide the needed volume which was discussed previously. The
following is the grade plan with the new contour lines to provide
the required volume for the detention pond with high water line
set at 5,981.00.
The size of the orifice to be installed at the inlet of the 15
inch storm drainage pipe is 4 inch orifice. The detention pond
volume required is still the same volume for the 2 inch orifice.
The allowable historical release flow of 0.50 cfs by using a 2"
orifice will result into a required volume of 4,752 cubic feet.
The volume needed to be retained is 4,752 cubic feet. The volume
in detention pond area is the storage volume between contour line
5079.70 feet and contour line of 5081.00. The volume needed is
determined using the following formula;
Volume = d (A + B + (AB) 1/2 )
3
Where; d = Depth between contour line ft.
A = Surface area of top contour line.
B - Surface area of bottom contour line.
Storage volume between contours 5,079.70 and 5,080.00 is:
A = 850.00 sq. ft., Surface area at contour line 5,079.70.
B = 3,081.00 sq. ft., Surface
with a depth of d = 0:30 feet,
Storage volume between contours
A = 3,081.00 sq. ft., Surface
B = 5,729.00 sq. ft., Surface
with a depth of d = 1.00 feet,
area at contour line 5,080.00.
Then V1 = 560.00 cubic feet
5,081.00 and 5,080.00 is:
area at contour line 5,080.00.
area at contour line 5,081.00.
Then V1 = 4,340.00 cubic feet
srrunrlsln,\ rl.:LvxrNG:Lvu or:slr,v - s01L .LYO Gr1"0-11ir:11NICAI. I.\ ITS7lf,.11IONs • r•0I "YO111101\•..STlr( (:II Irr: 01-NIGN .L\1r
m•.Src0101Y-VIIAINAGE.r1.001)coxrsnl.Ill- INNI G:LYI)USAIG.\'-i:.vrnrnx,+n::vr.u.,Lsslt.S.S.ril:,vr-cnN.Srlircrin.v.11:1N.1GNIENr
The drainage inlet box has the size of•2.2x3.67x3.2 which can
hold 25:84 ft3. Then total volume of detention pond is equal to =
25.84 + 560.00 + 4,340.00 = 4,925.84 ft3, which exceeds the
needed storage volume of 4,752 M .
If you have any further questions or need any more information
please feel free'to call me at (303)-484-0533.
sincerely, `
repared b
ohamed Worayeth
A Colorado Registered Professional Engineor
I
ISTEWART&LSSOCIATES 103 S482-933. MELDRUM, FORT COLLINS, CO 80521
PH. 1 FAX 482-9382
Consulting Engineers and Surveyors
By: Date: Client: Pi-(�2))oj-c? Sheet No. of
'� Project: '5i1 r q de r- Cwwll S-1-ore (2 Aht/ of or- Pors-ejacA 2"-
Subject: -De 0 11 ]::--,o V, ci L/O /(//,A
SVt01PR3 OS SiEDi_r yA1
Stermsell ":too
1. if deuaterinp is used to install utilities, Or State
Construction DevaterinV wastewater Discharge Permit is required if
discharged into a storm sever, channel, irrigation ditch, Or any
estate of the United States.
2. All Construction activities on this site must comply with the
state of Colorado Permitting Process for "Starmwater Discharges
Associated with Construction Activity." POT information, please
contact Colorado Department of Health, Water Quality Control
Division, WQCO PP-B2, 4300 cherry Creek Drive South, Deovar.
Colorado 00222 1530, Attention' Regalia and Enforcement section.
Pines (303) 692-3590.
S. Prior to final distraction and acceptance by the cdtp,
certification of the drainage facilities by a registered engineer,
must be submitted to end approved by the Rtorm»atar Utility.
4. Maintenance of all ardits end cffaiks drainage facilities will
be the responsibility Of the owners of the property. The owners
of the property at the present are Schrader Oil Co.
0 35 falls
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Site Aron Oscan
- 39,475 S.P.
yao H, O.•tl. Nat
- 33,421 F.P.
Titidir.9 Arnn
vs 3,125 S.F.
Parking 4 Driver
19,138 S.P.
Landscape .Area
- 11,150 S.P.
Street NA.M
It 6,054 S.F.
stlywgur OF DPA3HA�HUxoPr,
-
Historic
Total A (A- )
0.91
1 Hunrilt E-osiffi'ient
0.30
II'10pe A
1.33
LAIGS,tP f 0 F
240
Trial of t ti n)
21.0
HAITI intensity ("/hr)
1.00
paroff 111 2 SIT (.tar)
0.50
Rurnift for 10 yr (cis)
0.87
ti[. I F.r IGO IF (cis)
1.13
•. rIpN L.a_L }'I9HLOy-VOLWR;
Existing
0.91
0.34
1.30
ISO
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2.05
0.63
1.11
2.25
1 0.93 Acres)
1 0.90 Acres)
1 ].91)
(48.51)
partial ! )G year discharge
- 5.11
Cie.
Allowable release rate
- 0.50
cis.
The di[feaem'e
w 4.61
cis.
VDIIL a required
w 4,752
cubic feet.
Volume provided
as 4,617.04
cubic feet.
100 year high water
- 5,001,50
i-i k.P.IAINA_2E.PLTSL(AIIIII
0100
- 0.73
cis
Q2
- 0.18
eft
aside ITT (100)
- 1.05
ft/sec
Velocity(7)
i
- 0.72
ft/c se
Depth (100)
as 0.42
feet
Depth (2)
- 0.25
feet
Slope
- 0.671
1931
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F� 1Y LEGEND
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0 PROPERLY PIN FOUND
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HI:ARK 193 CITY OF FORT COLONS 2 5- ALUM CAP
'A T WEST EDGE OF SIDEWALK IN THE NW 1
'9!J.R Or HORSETOCTH AND SHIELD', AL S080.1
'f ELEVATION CONTOUR
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HI. I "ATEF CONTOUR LINE
Iwo FOIGET ELEVATIONS
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JPei OF PROPOSED DETENTION AREA
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INVERT
4"OF FILE PtATe
1C' ttALE -
A 4 inches orifice will he installed at the inlet of the 15
inches storm Fort pipe to regulate the flow.
ArcoInlet
_ llllillll
Str
ew Sears $talyd _�
,en 2 Stables f{r Bale A
MAN VIFW
AREA INLET FILTER - 1 dmgemOIC Instaboall no stakes
STRAW BALES E bales
e HmW rue one, Than
storm event. Remove moment
ale parf mane Film depth has been
blare. Remained lemhern VIIIII b
T enowaked la an . 'b v
Ran fE Stera, THmom barn a[ ,... 'r .
+-rp C p tan 3. Sea Mar anal AT eJhvir
'R r teed way of oeae.
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AINAGE 8 ERU 'JV CONTROL P;_AN
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100 Year Flora . cd: 00 a I
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Depth QG2- 1