HomeMy WebLinkAboutSite Certifications - 02/15/2005North Star
�`, design, inc.
a
February 15, 2005
Jay Barber
City of Fort Collins
700 Wood Street
Fort Collins, CO 80524
RE: Drainage Certification — Phase 1 Boardwalk Plaza
Northwest corner of Boardwalk and JFK Parkway
Mr. Barber,
This letter and attached information is provided to certify that the grading and drainage
improvements on Boardwalk Plaza Phase 1 have been constructed in substantial
conformance with the plans approved February 2004. All elevation information (shown
on the attached plans) is based on survey completed by Centerline Construction Services
and Heath Construction on October 17, 2004 and February 1, 2005. North Star Design
staff made a site visits on October 23, 2004 and January 22, 2005.
The building elevations, private drives, parking areas, and grading adjacent to the
building, are in substantial conformance with the approved plans. There were minor
modifications made to the elevations of the sidewalks, but these modifications did not
change the drainage scheme for the lot.
This letter also certifies that the required detention volume and the water quality volume
are adequately provided in the pond as it was constructed. Refer to the attached stage -
storage curve for the actual volumes provided.
,tions or if you need any additional information.
700 Automation Drive, Unit I Windsor, Colorado 80550
970-686-6939 Phone 970-686-1 1 88 Fax
Parcel "B" at ShopKo P.U.D.
Proposed Detention / Water Quality Pond - Stage/Storage
LOCATION: Shops at ShopKo
PROJECT NO: 170-03
COMPUTATIONS BY: TDS
SUBMITTED BY: NORTH STAR DESIGN, INC.
DATE: 2/17/05
V = 1/3 d (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 = 0.070 Acre -Feet
Detention Volume Required = 0.037 Acre -Feet
Total Volume Required = 0.107 Acre -Feet
WQCV
100 YR WSEL
Stage
(ft)
Surface
Area
W)
Incremental
Storage
(ac-ft)
Total
Storage
(ac-ft)
42.30
0
43.0
608
0.00
0.003
44.0
844
0.02
0.020
45.0
1118
0.02
0.642
46.0
1452
0.03
0.072
46.04
1477
0.001
0.073
46.91
2021
0.036
0.109
47.0
2077
0.00
0.113
48.0
4281
0.07 1
0.185
ASBUILT SURVEY 10117104
WQCV
100 YR WSEL
Spillway elev
Stage
(ft)
Surface
Area
(k`)
Incremental
Storage
(ac-ft)
Total
Storage
(ac-ft)
42.42
0
43.0
849
0.00
0.004
44.0
1114
0.02
0.026
45.0
1360
0.03
0.055
46.0
1638
0.03
0.089
46.04
1653
0.002
0.090
46.91
1987
0.038
0.128
47.0
2022
0.00
1 0.132
48.0
4281
0.07
0.203
asbuilt detention.xls
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WATER QUALITY OUTLET STRUCTURE
CALL UTILITY NOTIEICA'+�
CENTER OF COLORAF
1.800-922-1987
BL&L1:
FDA "
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
APPROVED
CAI Ens•. -
CHECKED BY
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11 OF 11
170-03