HomeMy WebLinkAboutSite Certifications - 06/06/2007North Star
IAftwdesign, inc.
May 9, 2007
Jay Barber
City of Fort Collins
700 Wood Street
Fort Collins, CO 80522
Dear Jay,
/G3 G,�.l�i7�a Jiz
HATER
IVE®
AN 0 6 2007 /
This letter is to certify the detention and water quality pond at Oakridge Business Park,
39`h Filing (Burr Oak Office Building). The approved stage -storage for the pond is
attached. The water quality volume in the pond is achieved at 4965.52 which is 0.07'
above the design elevation and the detention volume is achieved at 4965.95 which is
0.11' above the design elevation. The volumes achieved in these ponds appear to meet
the requirements set forth in the approved drainage report and plans within acceptable
construction tolerances.
A record drawing of the grading on site is also attached. The information presented is
based on topographic survey of the detention pond and site provided by King Surveying.
Please call me if you,hUI Oy/Westions or if you need any additional information.
r.
nicer \�\\�OAKRDT��m_0.
Patrici
700 Automation Drive, Unit I Windsor, Colorado 80550
970-686-6939 Phone 0 970-686-1 1 88 Fax
LOCATION:
PROJECT NO:
COMPUTATIONS BY:
SUBMITTED BY:
DATE:
WQ VOLUME
100 WSEL
OVERFLOW ELEVATION
PROPOSED POND
STAGE - STORAGE TABLE
(100-YEAR)
Burr Oak Office
205-03
PPK
North Star Design, Inc.
5/9/2007
100 yr Detention Volume Required = 479
Water Quality Volume Required = 592
Total 100 yr Volume Required = 1071
Stage
(ft)
Surface
Area
(ft2)
Incremental
Storage
(co
Total
Storage
(cf)
4964.0
0
4965.0
693
231
231
4965.45
1008
381
612
4965.85
1290
461
1072
4966.0
1394
1023
1254
4967.0
2165
1765
3020
4967.4
3380
1100
4120
ASBUILT POND VOLUME
WQ VOLUME
100 WSEL
OVERFLOW ELEVATION
Stage
(R)
Surface
Area
(Be)
Incremental
Storage
(cf)
Total
Storage
(cf)
4963.9
0
4965.0
578
208
208
4965.52
919
386
594
4965.96
1208
466
1060
4966.0
1234
886
1094
4967.0
1905
1557
2651
4967.1
2010
254
2905
cubic feet
cubic feet
cubic feet
R NNISHED ROOK PROPERTY BG11y/ Y
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- _ _ _ _ _ _
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— 1=800=922=1987
G x BU5N65 DAYS IN ADVANCE
BEFORE Ya DO CRACK. OR EXCAVATE
FOR PHE MARKING O UNDERGROUND
MEMBER UTOTES
City of Fort Collins, Colorado
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