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15 to 19 feet of alluvial silty sand, overlying dense sandstone of the Dakota group. The upper silty sands were generally of fine grain size, although numerous lenses and zones of gravelly material were encountered. The alluvial materials were generally in a low density, wet condition, al- though slightly denser, drier materials existed at the ground surface in many locations. C. Design The sizing and design criteria utilized for the transmission lines incor- porated "Elementary Fluid Mechanics" by John K. Vennard of Stanford Univer- sity. The criteria used for estimating the hydraulic losses for the piping network is shown on Table 5-a. The primary pumping station discharge pipeline will be designed and con- structed by the Ridges Metropolitan District. It is anticipated that duc- tile iron pipe material will be used for the parallel l6-inch diameter pipe- line from the proposed primary pumping station to Highway 340. From High- way 340 to the first storage reservoir the pipeline material is Class 200 A/c parallel pipelines. From the first reservoir to the second storage reservoir a l6-inch A/c diameter pipeline will be used. When construction of the discharge pipeline is complete, it is recommended that the pipelines be pressure tested in accordance with AWWA Standards to the full 200 psi rating of the A/C pipeline. Pipeline flows are anticipated to be at a mini- mum of 2,700 gpm to a maximum of 10,800 gpm at ultimate development of the project. An analysis was made to determine if only one or both of inch pipelines should be in operation at the same time. that both parallel l6-inch pipelines be used. the parallel 16- It is recommended If only one pipeline is used, analysis indicates that will range from 330 feet to 430 feet for flows of 700 This range will not allow efficient pump operations. mended that both parallel pipelines be used. the total dynamic head gpm to 5,400 gpm. Therefore, it is recom- The pipelines should be filled at a minimum rate (one pump operating). The existing 4-inch combination air and vacuum release valves on the parallel l6-inch A/c pipelines are adequate for filling and draining at 2,700 gpm. This existing valve's primary function is to expel or inlet air from the pipelines during filling and draining of lines. Usually air is also taken out of solution from the water during normal operation of the pipeline. In order to expel this air, air release valves should be located at various points of the pipeline. The final design of the pipeline will be analyzed to determine the location of air release valves. Generally, air release valves should be located at points on the profile where there is a decrease in the upward slope and on long assents at 1,500 feet to 3,000 feet inter- vals. These valves require periodic maintenance, therefore, they should be isolated by block valves. Pump systems design was referenced from "Pump Handbook" by Karassik, Krutzsch, Fraser & Messina. v - 2