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= V-5 the winter time or during low stream flow periods as a minimal standby-type water supply. The cost estimates therefore, assume completion of two shallow wells. Surface Water. The recommended primary initial source is a direct diversion from Willow Creek at the approximate location shown on the Drawing. A fil- ter plant, having a nominal capaci.ty of 80,000 gpd (gallons per day) would treat the raw water before distribution. The initial elevation would be ap- proximately 8,80D feet elevation, which would provide head through the fil- ter plant and gravity service to the entire Allenspark area. Preliminary facilities design includes the following: a. A diversion structure incorporating settling of coarse material. b. Four inch raw water pipeline to the treatment plant. c. A rapid sand type water filter plant with one 6-foot diameter unit, chemical feeders, and a coagulation tank. The plant shall be housed for al I-year use, and include a 10,000 gallon clear well with backwash pump. The generally excellent raw water quality should permit the omission of a separate clarification basin. Because of probable lack of adequate water for growth in Willow Creek, and to attain supply reliability, it is projected that future expansion would be through the use of Rock Creek as a ~ource. The supply facilities at Rock Creek would be similar, although the alternate of a slow sand filter should be later evaluated. The Rock Creek diversion point would be approximately 500 feet westerly of the southeast corner of Section 35. It is anticipated that several years of actual flow measurement on both Willow and Rock Creeks will precede the final decision as to an additional water source--if needed because of growth. WATER DISTRIBUTION SYSTEM The preliminary design locations of water lines and the water ,treatment plant are shown on Drawing V-I. The plan' 3YOUt conforms to the design criteria but differs from conventional municipal systems in that 1 ine looping has been min- imized to provide better circulatior1 control and reduce costs. In order to