HomeMy WebLinkAboutSite Certifications - 04/12/2001North Star
�Awmw design, inc.
April 10, 2001
Basil Hamdan
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, CO 80522
Mr. Hamdan
,
-7"3o/ze6%
This letter is in reference to the drainage and site certification rewired for the recent
construction at the Bank of Colorado, Oakridge Business Park, 28 Filing in Oakridge
Business Park, Fort Collins. A survey has been completed on the recently constructed
parking lot, storm pipes and detention/water quality pond in this development. Attached
are calculations showing the required detention/water quality volume for the pond and the
actual volume provided by the pond. The pond provides slightly less volume than is
required and the 100-year high water elevation is slightly higher than was designed.
Since this survey, the contractor has removed additional dirt from the pond in an effort to
achieve more volume. The pond was not resurveyed after this effort.
A sheet is attached showing the design elevations and redlines showing the `as
constructed' elevations. As you can see, the parking lot, in general, will function and
runoff will flow in the intended direction.
A sheet is also enclosed which shows the storm pipes that were designed for the site with
redlines showing the actual Gas constructed' inverts for the pipe. As you can see the pipes
have been installed within construction tolerances.
I certify that, based on the information provided to me by Fredrick Land Surveying, there
is adequate volume provided in the pond and the drainage pipes have been installed in
substantial compliance with the approved plans.
Please call me if 3fo-u ha _ Qr re ire additional information.
Sinc
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Patricia Kroetch, 9�'0F••.•,,,,.••'�,��'
North Star Design, Inc. �S10N R1• ��
700 Automation Drive, Unit I Windsor, Colorado 80550
970-686-6939 Phone 0 970-686-1188 Fax
f
Proposed Detention[Water Quality Pond - Stage/Storage
LOCATION:
Bank of Colorado
PROJECT NO:
114-03
COMPUTATIONS BY:
PPK
SUBMITTED BY:
NORTH STAR DESIGN
DATE:
3/13/01
V= 1/3d (A+B+sgrt(A'B))
where
V = volume between contours, ft3
d = depth between contours, ft
A = surface area of contour
Stage
(ft)
Surface
Area
W)
Incremental
Storage
(ac-ft)
Total
: Storage
(ac-ft)
68.4
0 ,
69
596
0.003
0.003
70
1096
0.019
0.022
70.83
1811
0.027
0.049
71
1957
0.035
0.056
71.76
3780
0.058
0.108
Required WQCV = 0.022 acre-feet
Required Detention volume = 0.027 acre-feet
Total Volume Required = 0.049 acre feet
ASBUILT POND VOLUME
Stage
(ft)
Surface
Area
(fe)
Incremental
Storage`
(ac-ft)
Total
Storage
(ac-ft)
68.4
0
69
572
0.003
0.003
69.5
780
0.008
0.010
70
1011
0.010
0.021
70.04
1031
0.001
0.022
70.5
1264
0.013
0.034
70.96
1549
0.015
0.049
71
1571
0.029
0.050
71.76
2018
0.032
0.081
Nater Quality Capture volume
100 Year WSL
Dverflow elevation
Nater Quality Capture volume
100 Year WSL
Dverflow elevation
wq.xls
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NOTES NECKED BY:�
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�L—l9n 1. STORES OF 4:1 OR GREATER SHALL BE SOODED TO MINIMIZE OSION. PIEIXEO BY:
E 2. ALL SPOT ELEVATIONS GIVEN ARE FLOWLNE OF CURB. M1b a
III I - 0 • • 3. WATER ONES TO MAINTAIN A MINIMUM OF 45' AND AMA%IM I OF 5,5' OWM
. • OF COVER MEASURED FROM FINISHED GRADE. CHECKED BY: �2 Z[�o0 3 OF 8
A ALL DUCTILE IRON PIPE (DIP) SHALL BE ENCASED IN PCIYMRI I.
CHECKED BY: __� NoD No. 114-03
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