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<br />, <br /> <br /> <br />I <br /> <br />I <br />I <br /> <br />. ...... ,.... <br />J~...' 00..1 0 <br /> <br />DISTHIOUTION TUNNELS <br /> <br />69 <br /> <br />I <br />/, <br /> <br />having a capacity of 46 acre feet: a forebay outlet structure, with <br />provision for slide gates; a 338-foot cast-in-place concrete pipe <br />connection lothe existing precast pipe of the upper feeder, including <br />a venturi meter section: and a short section of pipe leading from <br />the fore bay outlet structure to provide read~' connection to a future <br />lower feeder to Orange County. <br />Exc'lVation was nearly finished at the end of June 19:38 and' <br />placing of concrete was started on the following July 23rd. The <br />installation of valves and equipment was begun on December 5th, <br />fencing on December 12th, and the entire contract was completed <br />on February 7, H)39. District forces made necessary electrical <br />connections to supply power for operating, adjusted and lubricated <br />valves, removed the bulkhead from the outlet tunnel, drained and <br />cleaned the forebay prior to the first release of Colorado River <br />water from Lake Mathews in February 1940. The cost of the <br />head works structure, including valves and all District items, is <br />$274,168.16, <br /> <br />Upper Fecde1' Tunnels <br />Two tunnels only of the upper feeder had not been completed on <br />June 30, 1938, namely, Monrovia No.3 and Monrovia No.4. Of <br />these the latter was finished on July 12, 1938 but the No.3 tunnel <br />work did not reach completion until October 10, 1938, because of <br />delay occasioned by the storm of March 1938, when the contractor's <br />batching plant at the Fish Canyon adit was destroyed, with only <br />2,969 feet of lining remaining. A portable batching plant was <br />l':' brought in to the west portal and the lining finished from that point. <br />The tunnel was grouted behind the lining under pressures up to <br />- _ __60. pounds. per-square -inch. -Following -this -the- portion -west. of . - - - --- <br />, Fish Canyon adit was regrouted using pressures from 100 to 450 <br />pounds pel' square inch to seal off water encountered in this area. <br />I All clean-up was completed on the date noted above. Tunnel data <br />are given in table 17. <br /> <br />Precast COIlc1'ete Pipe <br />The construction of all of the ,precast concrete pipe schedules <br />on the upper feeder has been completed. The last of these to be <br />built, schedule 9P, between Monrovia No.4 and Sierra Madre tun- <br />nels, crossing Big and Little Santa Anita washes, was constructed <br />easterly from the completed Sierra Madre tunnel to within 280 <br />feet of Monrovia No, 4 and there stopped October 9, 1937 until <br />the tuunel contractor completed his work at the west portal on <br /> <br />\ <br />