HomeMy WebLinkAboutSite Certifications - 10/04/1996J !..
RMINC.
Engineering Consultants
A division of The Sear•Brown Group
209 S. Meldrum
Fort Collins, Colorado 80521
970/482-5922
September 30, 1996
Mr. Basil Harridan
City of Fort Collins
Utility Services, Stormwater
235 Matthews Street
Fort Collins, CO 80522
RE: 60-D.'s-Sports-Crossing-
Drainage Certification
Dear Basil:
STORMWATER
RECEIVED
SEP 3 0 1996
l
We *are hereby completing partial drainage certifications for the building and site
improvements at O.D.'s Sports Crossing P.U.D. The intent of this letter is to verify the
existence and acceptable quality of drainage utilities serving this building at the P.U.D.
The Olbrys are trying to obtain Certificates of Occupancy for their indoor sports building,
prompting the need for this certification. The attached drawing will serve as the record
document of existing elevations and information surveyed on September 25, 1996.
The following items appear to be in compliance with the Utility Plans:
1. The building has been constructed to an FF elevation acceptable to facilitate
drainage away from the floor slab. The floor slab for the building was built at the
elevation shown in red on the attached drawing ( Proposed FF=88.00; Existing
FF=87.95). Regarding the landscaping around the building, the field shots indicate
positive slopes out to the parking lots and positive slopes into the surrounding
swales.
2. Judging from the field -verified spot elevations, parking lot drainage is greater than
or equal to 1.0% in all directions in the parking lot serving the site. Overall, flowline
elevations are within construction tolerances (0.05 ft), allowing stormwater to drain
from the parking area to the temporary detention pond. According to these field -
verified elevations, the intention of the drainage and erosion control plan for this
portion of the project has been complied with.
Denver303/458-5526
3. Per the Utility plans, there are swales proposed along the north and west sides of
the building, which have been constructed in the field to a condition comparable
with the intention of the drainage plan. The swale sections DA and CA were
intended to be served by a subdrain, which has been constructed as proposed.
This subdrain was added to prevent excessive ponding of stormwater on these
sides of the building.
4. There is a curb opening near the northeast property corner for the purpose of
draining the on -site basins. The curb opening conveys drainage from the parking
lot, into a rip rap rundown, to be detained in the temporary pond. O.D.'s Sports
Crossing has accepted responsibility for the rip rap rundown and temporary
detention pond. In the event that any portion of this drainage system becomes
clogged or inoperative, it is the responsibility of O.D.'s Sports Crossing to inspect
and restore the system to a fully -operating condition.
5. The temporary detention pond was not surveyed in the aforementioned field survey,
but information relative to it is being gathered today. Following this letter will be
another certification request for the pond, based on its existing volume complying
with the propsed volume in the approved Drainage Report. This certification
request will also include information on the pond's outlet pipe.
This certification is signed and stamped. By signing this letter I attest that, to the best of
my knowledge, the record document conditions of the drainage facilities are described
above and on the redlined plans attached. Failure to properly disclose all known
information could result in rejection of this certification and prevent the release of any
Stormwater Utility holds on Building Permits and /or Certificates of Occupancy.
Thank. you for reviewing this certification. Please feel free to call Perry Cabot with any
questions.
Sincerely,
RBD, INC.
Prepared By:
\
rry abot
Projec gineer
cc: 684-001 (A) - Correspondence
Randy King, King Contracting
Rachel Olbrys, O.D.'s Sports Crossing
H:\USER\civil\projects\od_sport\tran.035
Reviewed by:
evin W. Gingery
7,
Water Resources Project Manager