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r t , ^ ~. .- J. '" ~rr:N STR U CTIO N UTI LIT I ES CONSTRUCTION W A.TER SYSTEM , . Prior to beginning construction wOI'k, no sources of construction water supply had been developed between the Colorado River and the Coachella Valley. Further west two developed sources were available, the Green well near Long Canyon and springs in the Morongo Valley, both of which sources were subsequently leased by the District. West of Big Morongo Canyon it was practicable to require contractors to purchase water from existing systems or develop their own supplies; eastward a District system was con- structed to serve all schedules between that point and the river. The drilling of water wells was begun by District forces in 1932 and continued until 1935. In some cases 6V2-inch test holes were drilled which were reamed out to set and perforate 16-inch casing if potable water in sufficient quantity was developed. In general, however, wells were drilled initially to set 16-inch casing. One shallow dug well was put down in Big Morongo Canyon, later being t'eplaced by a second dug well. Well pumps are all of the deep-well turbine type, electric motor driven. They vary in capacity from 100 to 750 gallons per minute, with the exception of the small Parker substation pump, and oper- ate under heads up to 530 feet. Each well pump, except at Green well, discharges into a nearby steel tank of 65,000-gallon capacity which is equipped with a float valve for automatic operation of the pump. At Green well the tank capacity is 21,500 gallous. All equipment was installed by District forces. The main lines consist of continuously welded "gas line" steel pipe in diameters of 5, 6, and 8 inches. The pipe is laid in trench with a minimum cover of 18 inches, except in crossing rocky areas where it is anchored to the rock. without cover, and painted with aluminum paint. Expansion joints were not used. In general the pipe lines are located as near as practicable to the aqueduct, in many places on or immediately adjacent to the right of way, with valves installed every four to five miles for convenience in opera- tion and maintenance. Service outlets were set opposite each tun- nel working point and at intervals of about two miles opposite canal and conduit schedules. Drain outlets were placed in low spots and air relief valves on all major summits. The main lines were constructed under three contracts with sep- arate specifications: (1) Big Morongo Canyon to Berdoo Canyon and Fargo Canyon to Yellow Canyon, 33 miles; (2) Yellow Canyon 125 ,.