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<br />." ,..." r <br />l_JJ <br />26 <br /> <br />~IETROPOLITAN WATER DISTRICT <br /> <br />change was moved to Hayfield. The garage at headquarters was <br />closed at the end of February 1940. <br /> <br />Costs <br />Revised costs of the completed tunnels are given in table 9. Due <br />to sundry credits and adjustments in charges for District items on <br />the contract tnnnels and credits for sale of salvaged equipment on <br />the Coachella tunnels there is a slight reduction in the costs as <br />given in the first annual report. <br /> <br />CANAL, CONDUIT AND SIPHONS <br />All construction of canal, cut-and-cover conduit, and inverted <br />siphons, with the exception of a short section of siphon at the west <br />portal of San Jacinto tunnel, was finished before June 30, 1938. <br />During the summer of 19m) preparation of these structures for <br />operation was completed from the Colorado River to San Jacinto <br />tunnel. This work consisted of removing invert dams which had <br />been installed to hold water for curing purposes, from the cut-and- <br />o cover conduit, bulkheads from siphon entrances, and cleaning up <br />canal sections where blow sand had accumulated. <br />With the completion of San .Jacinto tunnel approaching, prepara- <br />tory work was started in April 1939 on siphon schedules 20A and <br />20B, comprising the 752-foot portion of Casa Loma siphon at the <br />west portal. Partial excavation for this section had been made <br />at the time of opening the west portal early in 1935, when pipes <br />were laid in the cut to carry tunnel water into San Jacinto <br />River. To permit excavating the remainder of the trench the pipe <br />lines were relaid around the unfinished siphon schedules and exca- <br />vation was begun May 11th, followed by start of concreting June <br />19, 1939. Owing to the existing high groundwater level it was <br />necessary to excavate below grade and lay and roll in the trench <br />a gravel blanket, upon which a 6-inch concrete slah was placed. <br />The reinforcement steel cage was assembled on the slab, inside and <br />outside forms were set, and the barrel concrete was placed in short <br />sections. <br />The last concrete was shovelled into the transition structure of <br />this siphon by District directors, on October 14, 1939 during a <br />ceremony to celebrate the completion of main aqueduct construc- <br />tion, by placing this remaining concrete and by unveiling a com- <br />memorative plaque set in the west portal headwall of San Jacinto <br />tunnel. The backfilling and levelling of the area were finished in <br /> <br />/ <br /> <br />J <br />,J <br />I <br />I <br />