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I I i I I I I 1 I l \) I " ~ , I ~ 04"-' I i "i ~ ~l PUMPING PLANTS 235 as he proceeded into the building area. Excavation for the switch house was first in order, followed by that for pump house, incline railway, and delivery lines, that for the switch house being com- pleted in September and for the pump house in November 1936. After gronting the foundations and drilling for and setting an- chor bolts, the placing of concrete in the substructure of the pump house was begun at the end of November. The excavation for the incline railway was sufficiently advanced by January 1937 to start construction of the track, and in February work of placing con- crete piers and installing pipe in the delivery line was begun. In March placing of concrete in the switch house foundations and walls and in the power cable tunnel was commenced, and in April erection of the steel frame of the pump-house superstructure was begun by the Consolidated Steel Corporation, Ltd., subcontractor for this work and for the steel delivery lines at the two plants. Following a strike of the employees of the contractor in April 1937 all work at Intake plant was stopped, with the exception of steel erection by the subcontractor, who resumed work on May lOth and completed steel construction on both pump house and de- livery pipe by the end of the month. Work was resu_med by the general contractor September 7, 1937. By October placing of con- crete was again under way, followed by erection of structural steel for switch rack and transformer hoist and construction of concrete water tanks, gate house, and surge chamber. On February 19, 1938 a fire of unknown origin destroyed the forms for the top lift of the surge chamber and damaged the concrete wall surfaces, delay- ing completion. All other contract features were completed in March but the guniting of the damaged surge chamber walls was not finished until April. District forces began the installation of equipment as soon as this work could be done without delay to the contractor. In Jan- uary 1938 all contract work was completed inside the pump hOllse and the District proceeded with the assembly of valves and pumps in the pits, the necessary concrete work for valve, pump, and mo- tor foundations and pump enclosure, the assembly of the motors above the pumps, and shaft connection to the pumps. Concnr- rently with assembly of equipment in the pump house, work has gone forward on the power system from the high-voltage switch- ing station through the transformers and switch house to the mo- tors. The independent water system consisting of pumps, delivery lines, and high-level concrete tanks to supply water for cooling,