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I I I I I I I I I I I I I I I I I I I Air relief. Air relief valves will be located at all high points and at dead ends where air can be trapped. Waterhan@er. Surge tanks will be located at each well, and such other places where water hammer or transient pressures may occur in order to pro- tect the pipe from excessive pressures. Materials. Two-inch through eight-inch pipe will be plastic (PVC), pressure class 160. Larger pipe (10, 12 and 15 inch) will be asbestos cement, class 100 or 150. Class 150 will be used wherever the maximum pressure may be expected to exceed 75 psi. All materials will be spec- ified to meet applicable ASTM and AWWA standards. Pipe depths. The pipe will be placed at sufficient depths to eliminate dangers of freezing. The smaller pipe in particular will be placed below the maximum frost penetration. Pumping capacities. Pumping capacity should exceed the expected peak demands. The proposed total pumping capacity from the four wells is 4000 gallons pcr minute (5.76 mgd). The average daily use after 20 years is expected to be about 1.3 mgd, with the peak daily use 2.7 to 3.0 mgd. Thus, only rarely will more than two wells need to be pumping at one time. Storage capacities. Storage capacity exceeding one day's normal supply is desireable. Preliminary plans call for three storage tanks having a total capacity of 1.6 mgd, compared to the expected average daily use of 1.3 mgd after 20 years. Fire hydrants. Criteria for placement of fire hydrants includes (1) placement only on looped lines of 4-inch diameter or larger and (2) placement not over 3 miles apart. Construction considerations. The major portion of the construction will be routine trenching and pipelaying, but certain obstacles need special consideration. Crossing of the South Platte River and of Bijou and Kiowa Creeks will require protection from being washed out by floods. The preliminary design calls for utilization of highway bridges for support of pipelines crossing the South Platte River, but further study may result in one or more underground crossings instead. Crossings of railroads and major highways -13- M, W. BITTINGER AND ASSOCIATES, INC.