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4 <br /> s.. <br /> INTERNATIONAL TECHNOLCGy CORPORATION <br /> 1.0 INTRODUCTION <br /> IT Corporation was retained by BP Oil Company in December 1991 to conduct a sampling of <br /> the existing on-site monitoring wells on their property located at 1403 Country Club Blvd. in <br /> i . <br /> Stockton, Califomia. The wells were sampled In order to detect whether there had been a <br /> lateral dissemination of petroleum contaminants,encountered upon removal of seven <br /> a <br /> underground storage tanks from the site. <br /> , i <br /> 2.0 SCOPE OF WORK <br /> The scope of work for this sampling event included measurement of water levels within each <br /> well, well evacuation with subsequent groundwater sampling,and groundwater gradient <br /> 77 calculation. <br /> �- 3.0 METHODOLOGY <br /> On December 9, 1991 water levels and samples were obtained from three of the six <br /> monitoring wells (MW-5, MW-6 and MW-7) at the above referenced site(f=igures 1 and 2). <br /> f The rernaln"three wells(MW-1,MW-3 and MVV-4)contained no water,therefore no <br /> �= samples were coliected. Well sampling was conducted in order to facilitate hyd;acarbon <br /> plume delineation. <br /> Sampling procedures conformed to the California Regional Water Quality Control Bon-San <br /> Francisco Bay Region Guidelines for Addres6ng Fuel Leaks,September 1985;Td-Regional <br /> Recommendations for Preliminary Evaluation and Investigation of Under round Tanks May <br /> Y 18, 1959, revised January 22, 1991;and the LUFT Manual, March 1989. <br /> q Three well volumes wera evacuated from each well using one decontaminated G Inch <br /> x diameter PVC bailer per well. The wells were allowed to recharge and prnundwater samples <br /> were collected from the wells with a new Voss Technologies,disposable teflon bailer for each <br /> .� well. Water samples were placed directly from the baller Into laboratory supplied sample <br /> containers. No headspace was left In the samples to be analyzed for volatile organic <br /> A <br /> ti.4 <br />