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1 1 <br /> y. <br /> February 14, 1992 <br /> ARCO Service Station No. 2130, Stockton, California <br /> Ground-Water Monitorin <br /> We returned to the site on January 7, 1992, to measure depths to water in the wells,collect <br /> ground-water samples for subjective analyses, and collect water samples for laboratory <br /> analyses of dissolved hydrocarbons. We observed no subjective evidence of hyd,.:carnons <br /> in the water samples (Table 3). Our field methods are described in Appendix A. <br /> F <br /> Disposal of Soil and Water <br /> Soil cuttings generated during drilling were stored onsite an and covered with plastic <br /> sheeting. We collected four soil samples from the drill cuttings after each drilling events. <br /> These samples were composited into one sample at the laboratory and analyzed to evaluate <br /> l <br /> disposal options for the soil. At ARCO's request, soil was transported and disposed of by <br /> Dillard Trucking Inc. <br /> The drums containing the water from developing and sampling were labeled and temporarily <br /> stored onsite pending laboratory results. At the request of ARCO, the water was <br /> transported and disposed of by Baulch Petroleum of Melpitas, California. <br /> Laboratory Analvses and Results <br /> Soil and water samples were analyzed for total petroleum hydrocarbons as gasoline('IT Hg) <br /> using Environmental Protection Agency(EPA)preparation,Method 5030 and modified EPA <br /> Method 8015 and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using <br /> EPA Method 8020° Soil samples having the highest reading on the PID were submitted for <br /> analysis of total lead using EPA Method 6010. Laboratory analyses were performed at <br /> -, Sequoia Analytical Laboratory in Concord,California(Hazardous Waste Testing Labaratary <br /> Certificate No. 1624). Water samples were also analyzed for fecal coliform bacteria. Copies <br /> of laboratory reports are in Appendix C.--- _-- --- ----- --- — -------- -- <br /> 30003-aw 5 <br /> fh ' <br />