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<br />, o. . : <br /> <br />I' <br /> <br />.' .-, !', ,., <br /> <br />.Lui.l... <br /> <br />)1 ,\ ] N TEN A NeE <br /> <br />35 <br /> <br />November, after which Riverside County restored the Soboba road <br />where it crosses (lver the siphon. Final clean-up of the siphon area <br />was delayed until aggregate bins, batching, and other tunnel plant <br />and equipment could be sold and removed, but was accomplished <br />February 15, 1940. <br /> <br />Revised costs of completed canal, cut-and-cover conduit, and <br />siphons are given in tables 10, 11, 12, and 13. In practically all <br />cases the costs are reduced slightly from those given in the first <br />annual report due to credits on District items. <br /> <br />[ <br /> <br /> <br />I, <br /> <br />MAINTENANCE <br />During the construction period, protection and maintenance of <br />completed features were supervised by the several division engi- <br />neers along the line. Following completion of the main aqueduct <br />features and discontinuance of the division engineers' organiza- <br />tions, an aqueduct maintenance force was formed to take over <br />and continue such work. The headquarters of this force is at Iron <br />Mountain pumping plant, formerly Division 2 camp, with patrolmen <br />located also at Vidal Wash, Eagle Mountain and Banning to cover <br />the entire 242 miles of main aqueduct between the Intake and <br />Lake Mathews (Cajalco), together with branch roads to camps <br />and other roads not transfel'l'cd to the counties of Riverside and <br />San Bernardino. <br /> <br />During the period under review the maintenance forces have <br />cleared the Hayfield reservoir site, repaired storm damage to diag- <br />, _ _ _o!laLd!,ajl!s, gatrol foads, aI!<] highways" established the permanent _ <br />service yard at Iron Mountain, erected experimental sand fences <br />along certain portions of the canal, made such repairs as necessary <br />to prepare the aqueduct sections for operation, removed sand from <br />sand traps, built stilling basins for wasteway discharge. outlets, <br />moved cottages from discontinued substations and set them up for <br />use at the Iron Mountain camp and at Vidal Wash patrol station. <br /> <br />Between September 3 and 7, 1939 a widespread area along the <br />aqueduct was subjected to rainstorms of great intensity. Lake beds <br />like Danby, Cadiz, and Bristol, which had been dry for years. were <br />transformed into bodies of water. The intensity and general dis- <br />tribution of rainfall for the storm duration are shown by the fol- <br />lowing tabulation of official records: <br />