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HomeMy WebLinkAboutGrading Plans - 01/06/2020 (2)Accepted 1/6/2020 WL lanuary 02, 2p24 Mr. Wes Lamarque Fort Collins Utilities - Stormwater 700 Wood Street Fort Collins, CO 80522 RE: LDS Temple Distribution Center Wes: � J�R ENGINEERING This letter is intended to help clarify the impact of the proposed LDS Distribution Center building and adjacent sidewalk connectians on the existing development and storm water infrastcucture. Existing site conditions and drainage calculations were taken from the "Final Drainage Repart prepared by Landmark Engineering for The Church of Latter Day Saints Temple, Fort Collins, Coiorado" dated September, 2013. The Distributian Building and adjacent sidewalks account for Z,727 SF of new impervious area (0.04 acres @ 100% impervious). Accordingto the drainage reportthese improvements are within the t�ibutary area for the ex'rsting water quality pond �WQ Pond D59) located on the northeast corner of LDS Temple site. This existing pond is used for the sole purpose of water quality because detention is provided by the existing regianal detention pond located in Tract N�f the Westchase Community. The existing detention pond located in Tract N was sized to receive 216 cfs during the 100-yr event fram the LDS Temple site. According to the drainage report the 104-yr flow into the detention pond is only 112.54 cfs. The total tributary area for WQ Pond D59 is 21.02 acres of whi�h 28.76% (6.05 acres} is impervious. Of the 6.Q5 acres of impervious area 5,152 SF af impervious improvements (0.12 acres @ 100% impervious) are related to the on-site Future President's Residence. The Future President's Residence was accounted for in the drainage calculations and was intended to be canstructed adjacent to the Distribution Building i�ut the President's Residence was ultimately built off site. Thus it can be determinecf that the existing WQ Pond D59 is already adequately sized to handle the 1,727 SF of p�oposed impervious improvements as we11 as 3,425 SF of future impervious impravements (0.04 ac +0.08 ac = 4.1z acres @ 100% imperviousj. This also mea�s the existing detention pond volume is adequate. The existing maintenance building to which the Distribution Center building will be connected has a perimeter drain which functions to drain nuisance runoff. A portion ofthis perimeter drain will be removed and relocated to surround the Distribution CenterBuilding to ensure the same nuisance runoff is piped directly to the inlet in the nearby parking area. 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