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I: ~ I , ,. I , \. f .~ r '--1 ~\,;~ OPERATION AND MAINTENANCE 35 District-built grass-cutting boat, together with the removal and burning of the grass, required continuous attention during the warm months. The San Jacinto reservoir seepage system was im- proved by the installation of a new pump of greater capacity and the construction of a larger seepage sump and additional trenches and the enlargement of existing trenches. During October 1949, the Riverside County Road Department, constructed a new highway across the San Diego aqueduct be- tween Winchester and Temccula necessitating the construction of a reinforced concrete incasement around the District pipe line. The work was contracted by the county and was inspected by a District representative. The construction by the City of Los Ange- les of the extension of Western Avenue south of Torrance Boule- vanl made necessary the incasement in concrete of 140 feet of the Palos Verdes feeder and the lowering of one manhole by the city's contractor. A District representative inspected these operations as required from July to September 1949. A high count of diatoms and protozoa in Lake Mathews water samples early in February 1950 led to the treatment on February 21 and 22, of the entire reservoir area with copper sulfate at the rate of 15 pounds to the acre, the first such complete treatment since January 1948. A total of 30,000 pounds of the powdered ma- terial was sprayed on the water surface from two District boats. Water samples taken subsequently indicated that the treatment was successful in destroying the organisms, Additimwl sCI'vice outlets Eleven additional ~ervice outlets for member agencies were com- pleted-during tlie'fear, 'nilie lil" construction COli tract 'and two by District forces. The San Marino lateral, a mile-long 16-inch di- ameter pipe line built at District expense uuder contract with Wu- cetich Construction, was completed on October 12, 1949 making Colorado River water available to the City of San Marino at Sierra Madre Boulevard south of Walnut Street in Pasadena. Connection has not yet been made by the California Water and Telephone Company which serves the major portion of the city. The West Basin feeder, constructed for service to West Basin Municipal Water District and completed on April 10. 1950, extends from the Palos Verdes feeder in Avalon Boulevard westerly along Redondo Beach Boulevard and Manhattan Beach Boulevard to terminal delivery structures at Redondo Avenue, where service connections