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HomeMy WebLinkAboutPLATT FARM PUD PRELIMINARY - 3 90A - CORRESPONDENCE - STORMWATER-RELATED DOCUMENTS, Services Planning Department January 22, 1990 Linda Hopkins c/o The Group, Inc. 401 W. Mulberry Fort Collins, CO 80521 Dear Linda: The following comments have been received from the Stormwater Utility, with respect to the Platt Farm PUD Preliminary plan 1. Drainaee Report: - Report must be signed and sealed. - Include vicinity map. - Are there currently any historical flows into the Pleasant Valley and Lake Canal? Will there be any after development? - Please verify your assumptions with the report done by RBD, Inc. for the Weber Junior High site. - The various detention options proposed will need to be negotiated prior to final submittal. The on -site detention option shown on the plans is acceptable. - Off -site drainage easements will be required for the swale north of Troutman Parkway. Size outlet pipe of pond for the on-s.ite rate only. Off -site flows should be released over a spillway. - A hydraulic gradeline analysis will be required for the storm sewer at final. - See additional comments in the redlined report. 2. Utility Plan/Plat/Grading .Plan: Not all existing facilities are shown. Indicate sizes, inverts, materials, etc. - Show all existing and proposed drainage easements. - Identify the Pleasant Valley and Lake Canal and its easement on the grading plan. - The ditch company will have to review and approve the final plans. - Address erosion control at final. - Replace crosspan on "A" Street with inlets and storm sewer. - Show approximate area of detention pond. - Show more flow direction arrows. - City will maintain channel along Regency Drive, but not the open space areas nor the detention pond. 300 LaPorte Avenue • P.O. Box 580 • Fort Collins, CO 80522-0580 • (303) 221-6750 3. Landscaoina Plan: - Trees are shown in the channels. Show a channel crossection with the water surface level and the tree location with respect to the high water line. If you have any questions regarding these comments, please do not hesitate to contact me or Susan Hayes of the Stormwater Utility. Sincerely, Sherry Alb rtson-Clark, AICP Senior CitP Planner cc Phil Hendricks, EDAW Engineering Professionals Mike Herzig, Assistant City Engineer f ile