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• Performing Quarterly monitoring of the site by collecting groundwater <br /> samples from the existing and proposed wells on a quarterly basis. <br /> B. Site Location <br /> The Stockton Service Center is"at the intersection of West Main Street and Los <br /> f Angeles Avenue at 1804 West Main Street in Stockton, California. <br /> C. Background <br /> The District uses the Stockton Service Center as an operations and maintenance <br /> yard. The Stockton Service Center contains several buildings used for offices, <br /> maintenance garages, and storage. Formerly, three USTs and a pump dispenser were <br /> located adjacent.to the shop and garage and were used for refueling vehicles. The <br /> USTs were replaced by two above ground tanks. <br /> D. Site History <br /> In Jul 1987,y th e District removed one .1,000 gallon leaded gasoline UST from _ <br /> the Stockton Service Center. Petroleum hydrocarbons in excess of detection limits <br /> were detected in the soil beneath the east end of the tank. A soil and groundwater <br /> J <br /> assessment performed by Kleinfelder, Inc. (Kleinfelder) in May 1989 revealed <br /> petroleum hydrocarbons in excess of detection limits in soil and groundwater in the <br /> vicinity of the former tank location. This assessment included the installation of three . <br /> groundwater -monitoring wells, MW-1; MW72, and MW-3.and four soil borings, B-1, <br /> .B-2, B-3, and B-4. <br /> In September 1989 the District removed the two remaining USTs. No <br /> P . g <br /> indications of leakage from these tanks were observed and no petroleum hydrocarbons <br /> in excess of detection limits were found in the soil beneath the tanks. These two <br /> USTs were replaced with two above ground tanks. <br /> In February 1991, Roy R Weston, Inc. (Weston) performed an additional <br /> assessment of the site that included drilling four soil borings and completing each as <br /> monitoring wells (MW-4, MW-5, MW-6, and MW-7). Toluene and lead were <br /> detected in soil samples from all four borings while xylenes were detected in soil <br /> samples from three of the four borings. Benzene, xylenes, and total petroleum <br /> 93822 East Bay Municipal Utility District <br /> 40429200.wp 2 Work Plan-Stockton Service Center <br /> - i <br /> - i <br />