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24?l4 i i MET H 0 r 0 LIT A N W AT F: n f) 1ST H 1 cr Hayfield On the Hayfield plant the excavation for the various features was subcontracted, likewise the production of concrete aggregates and the steel work in the pump house structure, the two inlet mani- folds, and the delivery pipes. All other construction under the con- tract was performed by the contractor's own forces, During the week ending September 26, 1936 the contractor be- gan erection of a camp for housing his forces, at the same time starting excavation in the switch yard area. By the end of the year excavation had been extended into the areas covered by the sand trap at the west end of canal Schedule No. 13, the rectangular canal and box siphon leading thence into the plant, the pump house and inlet manifolds, and the delivery pipes. The first concrete was placed on this contract in the switching station footings in February 1937. In March and April concrete placing followed completion of excavation in canal, siphon, and spillway channel and by June the pump house foundation excava- tion being sufficiently advanced concrete work was started in the east walls and sump. During the summer concreting operations were continuous in an effort to make up time. In October, Consolidated Steel Corporation, Ltd., subcontractor, began construction of the lower inlet manifold, followed by the de- livery pipes in December and the structural steel of the pump house and upper manifold in January 1938, The delivery pipes were ready for testing in May 1938. ' Following the completion in February 1938 of the steel frame t of the pump house, the placing of concrete in the structure was resumed in April and was nearing completion at the end of June, at which time also most of the other features, viz., the inlet struc- tures from both aqueduct and reservoir, the delivery pipes and gate house, the incline railway, and the switch rack were completed or I nearly so, except for clean-up. j TRANSMISSION LINES The District has contracted with the United States for a supply of power to operate its pumping plants, as discussed in Chapter 2. This power will be generated at Boulder dam and will be de- livered to the points of use by transmission lines which have been built and will be operated by the District. These lines consist of a 230-kv single circuit from Boulder through Searchlight, Nevada, to a midpoint switching station at Camino, whence two branches extend, one to the Gene plant, with a 69-kv extension to Intake; ~