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Wiggins & Assoczates, Stockton, Cala.fornza /project 309101 July 31 , 1991 <br /> were recovered from the borings and were chemically analyzed. This <br /> work was performed to investigate for the presence of Gasoline and <br /> Diesel compounds in subsurface materials at the site. Chemical <br /> analysis of soil samples reveal relatively high Gasoline compounds <br /> in the samples recovered from soil borings located east of the <br /> existing fuel tanks (Borings B--3 and B-7) , and from one boring <br /> -- located near the north eastern limits of the site (Boring B-1) . <br /> The highest levels of Gasoline compounds are found in samples <br /> recovered from Boring B-1 . The highest levels of Gasoline <br /> compounds were found in samples recovered near the soil - ground <br /> water interface. The highest levels of Diesel compounds were found <br /> in a sample recovered from beneath (approximately 2-1/2 feet deep) <br /> the existing diesel dispenser. <br /> t Sources for gasoline compounds found in the subsurface materials at <br /> the site are not known. Failed precision tests indicate that the <br /> integrity of the fuel storage tanks and/or piping is questionable. <br /> The existing fuel storage tanks at the site are possible sources <br /> for the Gasoline compounds. Continuing use of these tanks, as they <br /> — exist, is not recommended. The SJCPHS will likely require these <br /> tanks and related piping be either retro-fitted to meet current <br /> underground storage tank regulations, or appropriately removed. <br /> The extent of the Gasoline and Diesel compounds found in the soils <br /> — beneath the site is not known. The California Regional Water <br /> Quality Control Board (RWQCB) , and the SJCPHS will require <br /> characterization of the Gasoline and Diesel compounds found at the <br /> site. The impact of these compounds to ground water will also <br /> require investigation. This can be accomplished with the <br /> installation of ground water monitoring wells at the site. Water <br /> samples from these wells will be periodically recovered and <br /> chemically analyzed for the above--mentioned compounds. When the <br /> extent and nature of these compounds is characterized, remediation <br /> TMC Environmental, Inc. / San Pablo, Calsfornia 9 of 12 <br />