HomeMy WebLinkAboutSite Certifications - 12/16/2003North Star
design, inc.
December 16, 2003
Jay Barber
City of Fort Collins
700 Wood Street
Fort Collins, CO 80524
Mr. Barber,
DEC 16 2003
This letter and attached information is provided to certify that the drainage improvements
at The Lofts at Park Central described below have been constructed in substantial
conformance with the plans approved April 2003 and revised September 2003. All
elevation information is based on surveys completed by King Surveyors, Inc. (6-30-03,
and 12-5-03). North Star Design took measurements on the outlet structure in the field
on December 8, 2003 and December 16, 2003. This certification includes the following
improvements:
• The water. quality pond and outlet structure — see attached calculations and
sketches.
• The proposed storm sewer — record drawings have been sent to Lance Newlin at
Engineering, the profile is attached.
• Driveway and parking lot improvements, including concrete channels, cubs and
pans. Based on the survey information, the only paved area that is substandard is
the concrete channel northeast of Building 1, this channel has been constructed at
approximately 0.2%, but does have fall. This is a private improvement and the
Owner is aware that additional maintenance or reconstruction of this cannel may
be needed in the future. The owner has opted to not reconstruct this channel at this
time.
• All foundations have been installed at proper elevations. Elevation Certificates
will be submitted as these buildings become ready for Certificates of Occupancy.
At this time, the sidewalks serving Building 3 and Building 4 (south side of the site) have
not been constructed. The construction of these walks will not change required drainage
patterns and no further drainage certification for this site should be needed.
Please call me if you have any questions or if you need any additional information.
Sincerely,
Michael Oberlander, PE, LSI
cc:
Doug Dohn, Dohn Construction Inc
700 Automation Drive, Unit I Windsor, Colorado 80550
970-686-6939 Phone 970-686-1 188 FaxiQp�GAys
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PROJECT NO:
COMPUTATIONS BY:
SUBMITTED BY:
DATE:
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Record Water Quality Pond - Stage/Storage
WO WSEL
TOP OF POND
PARK CENTRAL
174-01
MPO
NORTH STAR DESIGN
6/30/03
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 2000 CF
Stage
(ft)
Surface
Area
(ft`)
Incremental
Storage
(ac-ft)
Total
Storage
(ac-ft)
4931.4
0
4932.0
1780
356
356
4932.6
4792
1899
2255
4933.0
6800
2307
4561
4933.1
7100
695
5256
4933.3
7700
1480
6736
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2. P DE LENGTHS INCLUDE MS.
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