HomeMy WebLinkAboutLot Certifications - 02/22/2001 (3)North Star
�A%�, design _
February 21, 2001
Basil Hamdan
City of Fort Collins Stormwater
700 Wood Street /
Fort Collins, CO 80522 y�fG(/v�TTO�✓ li/Z_
Mr. Hamdan,
This letter is in reference to the drainage certification required for the recent construction
at Oakridge Business Park, iling in Oakridge Business Park, Fort Collins. A survey
L� a
has been completed on the -recently constructed parking lot, storm pipes and water quality
ponds in this development. Attached are calculations showing the required water quality
volume for the south pond and the actual volume provided by the pond. As you can see,
the parking lot, in general, will function and runoff will flow in the intended direction.
The south pond provides slightly more volume than is required and the 100-year high
water elevation is lower than was designed. The north pond is not being certified at this
time because the parking lot, which has some ponding, has not been constructed with this
phase.
A sheet is also enclosed which shows the storm pipes that were designed for the site with
redlines showing the actual `as 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 Centerline Construction Layout
Service, LLC, there is adequate volume provided in the south pond and the drainage
pipes have been installed in substantial compliance with the approved plans.
Please call me if you
Patricia Kroetcli,'
North Star Design,
additional information.
1194 W. Ash Street, Suite B Windsor, Colorado 80550
970-686-6939 Phone 9 970-686-1188 Fax
E
OAKRIDGE PARCEL G
Proposed Water Quality Pond 2 - Stage/Storage
South' Pond
LOCATION:
PROJECT NO:
COMPUTATIONS BY
SUBMITTED BY:
DATE:
Oakridge Parcel G
128-01
PPK
NORTH STAR DESIGN
2/21/01
V=1/3d(A+B+sgrt(A*B))
where V = volume between contours, ft3
d = depth between contours, ft
A = surface area of contour
Water Quality Volume Required = 0.141 Acre -Feet
WQCV
Overflow ek v
WQCV
Overflow elev
Stage
(ft)
Surface
Area
W)
Incremental
Storage
(ac-ft)
Total
Storage
(ac-ft)
51
0
0.00
0.00
52
1762
0.01
0.01
53.0
4972
0.07
0.09
53.40
6584
0.05
0.141
53.90
8600
0.14
0.226
54.0
9290
0.16
0.25
54.9
22923
0.32
0.57
ASBUILT POND
Stage
(ft)
Surface
Area
W)
Incremental
Storage
(ac-ft)
Total
Storage
(ac-ft)
51.04
0 _
0.00
0.00
52
2805
0.02
0.02
53.0
6203
0.10
0.12
53.40
8869
0.07
0.190
53.90
12202
0.19
0.308
54.0
12544
0.21
6.33
54.9
22923
0.36
0.69
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dab No. 128_01