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""!",O'I') 40,) '... OPE R ..\ TI 0 NAN D ~I ^ I N TEN A N C E 3\ ~ tures along the Palog Verdes feeder to improve ventilating condi- tions. A fence was constructed around District property at the north portal of Hollywood tunnel. Repairs were made to the valve control shaft in the head works at Lake Matbews. All mate- rials and equipment remaining in salvage stocks at Banning were moved to the softening plant yard at La Verne. Considerable painting was done on structures at Palos Verdes reservoir and Lake Mathews. Aluminum paint was applied to metal surfaces that were camouflaged during the war period for purposes of safety, The reservoir area at Lake Mathews below elevation 1347' feet was cleared of weeds and other vegetation prior to increasing the amount of water in storage by main aqueduct pumping, The side slopes of Plllos Verdes reservoir were cleaned from the top down to withill 14 feet of the bottom, Three 4-inch relief valves were installed at the Beverly Hills relief valve structure to replace the existiug valves. A 36.inch meter was removed from the Orange County reservoir by-pass line and the propeller from this meter was used to replace the damaged propeller in the 36 x lO-inch compound reservoir outlet meter. A break in the Orange County feeder line opposite the Bristol Street pumping station in Santa Ana was repaired. This break was caused by failure of a bolt in a :lO-iuch victaulic coupling allowing a flow of 15 cubic feet per second to be released. There was no damage to property, The line was returned to service after a total outage of 29 hours. Two small leaks in the concrete pipe line south of the Corona del Mar reservoir were repaired by pouring concrete collars around the pipe, In addition to the work done by the maintenance crew in con- nection with reservoirs, pipe lines, and appurtenant structures, - considerable -work -was .done -at-the - softening and. filtration-plant at La Verne. Accumulated sludge was removed from clarifier and floeeulator bllsins, During the time these basins were out of serviee, the coal-tar enamel coating on the steel overflow weirs was cleaned and painted with a copper-base anti-fouling paint to inhibit the growth of algae, and a new overflow pipe was installed in the lower sludge basin, One filter bed was cleaned of algae, sandblasted. and painted with similar anti-fouling paint as an ex- periment in preventing the growth of algae on the concrete sur. faces. Propellers on both 36-inch meters, installed in the two chambers of the influent channel, were metalized for protection against corrosion, The temporary restricting orifices were re- moved from the influent channel. These orifices were originally I ~