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<br /> <br />l~LS <br /> <br />1:\0 <br /> <br />METROPOLITAN WATf:R DISTRICT <br /> <br />the system except that portion supplied from the Buried Mountain <br />wells. Investigation disclosed the cause to be one or more of the <br />following: <br />(a) Excess free carbon dioxide; <br />(b) Crenothrix, an iron bacterium; <br />(c) Sulphate-reducing bacteria; t, <br />(d) Excess iron in the natural well waters. <br />In order to overcome this difficulty aerators were constructed at <br />the Big and Little Morongo wells to remove free carbon dioxide, <br />and at Big Morongo a chlorinator was installed as a precautionary <br />measure to treat the surface flow from Morongo Valley. No treat- <br />ment has been necessary at the Buried Mountain wells. At the <br />Pinto well an aerator, a chlorinator, and a dry-lime feeder were <br />required to eliminate the excess iron and the sulphate-reducing <br />bacteria. At the Vidal Wash, Earp, and Eureka Wash wells the <br />treatment consists of chlorination and the addition of dry lime to <br />correct acidity. The water-treating equipment has operated very <br />satisfactorily. <br />O]Je1'Cttion and. maintenance <br />The entire system is periodically inspected by a supervisor with a <br />crew of from three to five patrolmen, who check the operation of <br />equipment, oil the motors, pumps, and bearings, attend to the flow <br />meters, read water meters, clean and chlorinate reservoirs, tanks. <br />and pipe lines when necessary, and make adjustments or repairs <br />as required. In addition, an inspector from the office of the hydro- <br />graphic engineer in Los Angeles takes bacteriological samples twice <br />monthly and samples for chemical analysis occasionally. Samples <br />are taken from every source of supply and from the faucets of all <br />camp kitchens in operation on the system. <br />The construction water system has proven of sufficient capacity <br />and has presented no major operation and maintenance difficulties. <br />The cost of construction, cost of operation and maintenance, and <br />net cost after credits from water sales are given in Table 10. The <br />figure given for cost to June 30, 1938, is the actual net cost without <br />depreciation and interest. <br />CONSTRUCTION POWER SYSTEM <br />Early in 1932, in order to have a basis for negotiations on power <br />rates and for design of the transmission system, estimates were <br />made of the power requirements for the construction program then <br />under consideration. A maximum connected load of 31,000 horse- <br /> <br />~ <br />