HomeMy WebLinkAboutSite Certifications - 11/08/1994RMINC.
Engineering Consultants
209 S. Meldrum
Fort Collins, Colorado 80521
303/482-5922
FAX:303/482-6368
November 7, 1994
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Mr. Basil Hamdan
City of Fort Collins
Utility Services Stormwater(�
235 Mathews Street SDr"`� G�dC1i���o��•�C'`�"
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Fort Collins, Colorado 80522 (�e(L �� V ✓l� f
RE: Wild_Wood_Farms_2nd_Fil-in9
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Drainage Certification 9 D c
PROJECT NO.: 553-001
Dear Basil: wit VL I`I-2 i v6 L lE-
On November 3, 1994,.survey crews from RBD field verified the
drainage improvements that have been installed to date at the Wild
Wood Farms 2nd Filing project. I have attached sheet 4 of 20 from
the approved construction plans, and have indicated in red the
field verified elevations, and in blue the approved plan
elevations..
All of the storm sewer inlets and piping appeared to be installed
per the approved construction plans. Riprap has been installed at
the outlets per the approved plans.
Three minor discrepancies were found with the drainage system as
installed. First, the swale along the northerly property line was
found to 2:2 feet deep, instead of 2.5' as. specified on the plans.
The 2.2' depth will be adequate to convey the 100.year flows to the
detention pond, but will not provide 33% additional capacity as
freeboard. Given the relatively temporary nature of this Channel,
this should be adequate.
Second, the rear lot corners along the southerly property line are
lower than the plan calls out. If they are left at these lower
elevations, these lots will become B type lots with the Third
Filing, which would be acceptable as long as it is accounted for in
the final design of the Third Filing. RBD is doing the final design
of Wild Wood Farms Third Filing.
Third is the top of the outlet structure within the detention
system. Inadvertently, the approved Utility plans called out for
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Denver303/458-5526
the top of the structure to be at an elevation of 21.92, which it
was constructed at (actually 21.98). The volume needed for
detention has been met (actually exceeded), and the 100 year
developed storm can safely.be stored in this pond. Since this
structure is higher, the amount of effective pond freeboard has
been reduced to approximately 611.
Thank you for your time and consideration of this Certification
submittal.
Sincerely,
Inc. Engineering Consultants ��\04\-)p�REG/j
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