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04/24/01 Fraser to Amerman/Water Main ExtensionThomas, Dean & Hoskins, Inc. rl" D Engineering Consultants April 24, 2001 0 Dick Amerman City of Kalispell P.E./Assistant City Engineer PO Box 1997 Kalispell, MT 59903-1997 RE: Mountain View Plaza Dear Dick: Pursuant our discussion of April 18' we are proceeding with the design of the water main extension and supply for the subject project at build out with the following design criteria: o Fire flow 2250.gallons per minute for two hours s Maximum Day 1400 gallons per minute for the. upper zone o Maximum Day 124 gallons per minute for Mountain View Plaza s ` Total Flow 3774 gallons per minute Available supply is from the combination of storage and: pumpage for the fire duration. This is summarized as: ♦ Storage 100000 gallons ♦ Supply _Grandview #1 1100 gallons per minute ♦. Booster Pump #1' '-' 1500 gallons per minute ♦ Booster Pump - #2 .1250 gallons per minute ® Booster Pump #3 900 gallons per minute Booster PLmp #4 700 gallons per minute Water Quality Circular #2 for public water systems requires the booster pump system to meet the maximum day with the largest pump out of service. The total supply available including the Grandview Well #1 is 3950 gallons per minute. Since the supply is greater then the demand fire flows can be meet during the event regardless of the volume in storage and no improvements are necessary for the existing supply to meet the demands. We. are re -running .the analysis and will provide the. print out when completed.. 690 North Meridian, Suite 101 • Kalispell, MT 59901 • (406) 752-5246 • FAX (406) 752-5230 Page 2 of 2 4/24/01 If you have any questions please feel free to contact use. Sincerely, THOMAS, DEAN & HOSKINS, INC. UV' Michael W. Fraser, P.E. MWF: tb KOO-084-005 Cc: Stan Beard Blair Warehime Scott Busch (w/file copy of analysis and data) d:\active jobs thru 2000\crosswell devp. 00-084\k00-084-005 water main extension\apr24.Ol .amerman.fireflow.ltr.doc D:\Forms\Correspondence\Letter Format With Access.doc