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II I I I' ~ ~.. ~ ! i ~ ~ f , I ~ l. C!> ~ , ~c~~ OPERATION AND MAINTENANCE 33 Street and 108th Street. District forces made the valve installations, consisting of two 14-inch hydraulically operated and two 14-inch manually operated cone plug valves and two 20-inch gate valves at each structure. During the shutdown an inspection of the interior of the Palos Verdes feeder between Nigger Slough and 184th Street revealed the mortar lining to be in good condition with no deposits on the surface. A second partial shutdown of the feeder was made from June 25 to 27, 1950 to permit the removal of the bulkhead in the Victoria Street lateral turnout tee. The distribution system head works structure between the Lake Mathews outlet tunnel and the upper feeder is required to control the flow and pressure of water released from Lake Mathews. The head works consist of an outlet manifold with regulating valves, a small forebay, and a forebay outlet structure. The installation of three additional regulating valve assemblies by District crews was practically completed at the end of the fiscal year. These new assem- blies, added to the initial two, provide a total of five ""Ive assemblies in the head works structure. . At the 108th Street and Washington Street regulating structures 'of the Palos Verdes feeder, District forces had nearly completed the construction of facilities to provide more convenient access to the frequently visited underground vaults. This work consisted of the erection of metal stairways and S-foot by 12-foot prefabricated metal buildings over the structures in lieu of the original metal hatch covers and ladders. The construction of a new and larger concrete structure at Moun- tain Street and Martelo Avenue on the upper feeder in Pasadena was completed on March 29, 1950 to house the new lO-inch vacuum valve installed during the above-mentioned-shutdown, The San Diego aqueduct was in almost continuous operation at near-capacity flows during the fiscal year, averaging 95.73 cubic feet per second. Tn order to destroy organic growth on the interior pipe surfaces and thus maintain a high carrying capacity in the San Diego aqueduct, a chlorination station was installed at the outlet of San Jacinto reservoir in Oelober 1945, During the past fiscal year it was necessary to chlorinate the San Jacinto reservoir outflow about two-thirds of the period at rates varying from 340 to 960 pounds of chlorine per day. At the request and expense of the San Diego County Water Authority the District installed a tempo- rary chlorinator near the south portal of Red Mountain tunnel for the purpose of eliminating bacterial growths in the Authority's