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I1\TERNATIONAL TECHNOLOGY CORPORATION <br /> 1.0 Introduction <br /> IT Corporation was retained by BP Oil Company in December 1991 to conduct quarterly <br /> sampling activities of the existing on-site monitoring wells on their property located at 1403 <br /> Country Club Blvd. in Stockton, California. The wells are sampled in order to detect whether <br /> there had been a lateral dissemination of petroleum contaminants, encountered upon removal <br /> of seven underground storage tanks from the site. <br /> 2.0 Scope of Work <br /> The scope of work for this sampling event included measurement of water levels within each <br /> rwell, well evacuation with subsequent groundwater sampling, and groundwater gradient <br /> calculations. <br /> 3.0 Methodology <br /> On March 9, 1992 water levels and samples were obtained from three of the six monitoring <br /> wells (MW-5, MW-6 and MW-7) at the above referenced site (Figures 1 and 2). The <br /> remaining three wells (MW-1, MW-3 and MW-4) contained no water, therefore no samples <br /> were collected. Well sampling was conducted in order to facilitate hydrocarbon plume <br /> delineation. <br /> Sampling procedures conformed to the California Regional Water Quality Control Board - <br /> San Francisco Bay Region Guidelines for Addressing Fuel Leaks, September 1985; Tri- <br /> Regional Recommendations for Prelimin , Evaluation and Investigation of Underground <br /> Tanks. May 18, 1989, revised January 22, 1991; and the LUFT Manual, March 1989. <br /> Three well volumes were evacuated from each well using one decontaminated 4 inch diameter <br /> PVC bailer per well. The wells were allowed to recharge and groundwater samples were <br /> collected from the wells using a new Voss Technologies, disposable teflon bailer for each <br /> M7J03-17-42/UST/0047MER 1 <br />