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HomeMy WebLinkAboutPASTOR - Filed GC-GENERAL CORRESPONDENCE - 2004-08-30M&I consulting engineers 4710 South College Ave. Fort Collins. Colorado 80525 Telephone 1303) 226-2323 August 14, 1979 Pastor Motor Company 2849 South College Fort Collins, CO 80525 ATTN: Mr. Ken Pastor I Drainage of Pastor Motor Company Expansion Dear Ken: This letter is to inform you of the analysis and design we have com- pleted on the drainage for the expansion of Pastor Motor Company. The following paragraphs outline the steps we have taken in analyzing the site. For further clarification a Drainage Plan is attached. This re- port conforms to the subdivision regulations of the City of Fort Collins. All calculations pertaining to this report are available upon request at our office. The general topography of the area of expansion for Pastor Motor Company is comprised of a flat plain sloping west to east. The only storm drain system that exists in the area consists of the surface gutter flow in the service road which fronts the existing Pastor Motor Company property. The approach taken to develop a drainage plan for the expansion site re- volved around the City of Pert Collins drainage requirement that the 100 year storm be held in storage allowing an outfall rate at the 2 year his- toric level. Since virtually the entire area will be paved or roofed high runoff coeffients where assumed. The total area was divided into north and south flowing basins. The combined 2 year historic flow for the area totals to 0.6 cfs. To limit the outfall to this quantity two small concrete channels with notched entrances will be installed. These channels will start at a depth of 8 inches and taper to; meet the existing pavement elevation at the east side of the site. Storage for the 100 year storm will be accomplished by mini- mal slopes on parking and 'nigh back curbing. (See attached Drainage Plan.) This drainage design will satisfy all hydraulic considerations as well as gcvernmental regulations in providing this site with both a safe and equitable solution to the problem of handling storm water runoff. The following is recommended: 1. Storm water runoff should be routed as shown on the Drainage Plan. 2. All drainage facilities and detention ponds should be constructed as shown on the Drainage Plan. Very truly yours, .f & I, INC. Stan A. Myers James K. `.icho'_s, P.E.-L.S. SAM, /JMT/rb Enclosure