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<br />3a13,
<br />~PEnATION AND MAINTENANCE
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<br />The initial construction program on the Main Aqueduct completed
<br />the tunnel:-;, cut and cover conduit~. canals and some of the siphons
<br />to their full designated firm capacity of 1,605 cubic feet pe,' second,
<br />as these were not susceptible of being enlarged or duplicated at a
<br />later date and the costs of building half capacities were from 70 to
<br />80 per cent of the costs of full capacity construction, Other features
<br />of the aqueduct could be readil;' increased to full capacity by ad-
<br />,litions and duplications, The ultimate substructure of each pump-
<br />ing plant was completed for nine pumping units but the initial pro-
<br />gram provided housing or superstructure for only five pumping
<br />units, Initially there were only three pumping units installed and
<br />only one of three pump delivery lines at each plant. Along the line
<br />there were 47 siphons designed with t\\'o barrels but initially only
<br />one barrel was built, One 230-kv transmission line from Hoover
<br />Dam was built as part of the first construction program,
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<br />In 1951-52 when the expansion program was initiated it included
<br />the completion of all the Main Aqueduct features to provide for full
<br />design capacity, The superstructures of the pumping plants were
<br />enlarged to accommodate nine pumping units at each plant. The
<br />additional six pumping units at each plant were purchased and in-
<br />stalled and the two additional pump deliver)' lines at each plant
<br />were completed by September 1959, The second barrels of the two
<br />barrel siphons were all completed by December 1959, The second
<br />230-kv transmission line was completed in December 1960, At the
<br />end of the calendar year 196(), the Main Aqueduct was completed to
<br />full design capacity,
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<br />The cost of the Main Aqueduct to June 30, 1961 is shown on
<br />Table 6 and includes the costs of preliminary investigations and or-
<br />ganization, rights of way. con:-;truction utilities, Parker Dam. and
<br />all items and improvements charged to capital account.
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<br />Aquedllct M(o"lIi-ClIn.f/CC
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<br />During the year routine maintenance was carried on including
<br />eccurity, patrolling of the Aqueduct and power and telephone lines,
<br />repairing drainage ditches, fences. patrol roads, canal linings and
<br />buildings, cleaning sandtraps and trash racks, controlling the
<br />growth of algae and water vegetation, reading and servicing weir
<br />gages, operating and servicing control equipment, taking and re-
<br />cording water and air temperatures, and collecting water samples
<br />for analysis, During the year equipment and crews were engaged
<br />in cleaning all carbonate deposits. scale and algae from the concrete
<br />lining of the canals and box siphons, The salt evaporation basins in
<br />Danbv Dr\' Lake were flooded and the salt harvested for use bv the
<br />wate; treatment plant at La Verne, Between September 5, 1955,
<br />when the first salt was harvested. and June 30, 1961, there have
<br />been 120,745 tons of salt harvested and shipped in 2,307 carloads
<br />for use at the F, E. Weymouth Softening and Filtration plant, on
<br />the Upper Feeder near La Verne, California, During 1960-61 there
<br />were 17,160 tons of salt shipped in 330 carloads,
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