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EMCOA Associates <br /> 1433 North Market Boulevard •Sacramento,California 95834-1943• (916)928-3300• Fox(916)928-3341 <br /> October 24, 1994 <br /> Project 0952-092.02 <br /> Mr. Harlan Noll <br /> San Joaquin County Public Health Services OCT 2 61994 <br /> Environmental Health Division <br /> P. O. Box 288 ENVIRONMENTAL HEALTH <br /> 455 North San Joaquin Street PERMIT/SERVICES <br /> Stockton, California 95201 <br /> v <br /> U <br /> Re: Proposed Assessment Activities, British Petroleum (BP) Station Number 11194, <br /> M 2375 Tracy Boulevard, Tracy, California <br /> Dear Mr. Noll: <br /> J <br /> EMCON Associates (EMCON) is proposing to sample three soil borings using cone <br /> penetrometer methods at the BP service station mentioned above. This work is being done <br /> as part of a property transfer baseline assessment. <br /> r Soil borings will be located approximately at the locations shown on the attached site map. <br /> r-► One soil boring will be in the vicinity of the underground storage tanks, one_soil boring <br /> rV <br /> will be in the vicinity of the pump islands, and one boring will be adjacent to the station <br /> building. <br /> i <br /> Soil samples will be collected at approximately 2.5-foot intervals from each boring using a <br /> stainless steel geoprobe sampler. Up to two soil samples from each boring will be <br /> submitted for total petroleum hydrocarbons as gasoline (TPHG); benzene, toluene, <br /> ethylbenzene, and xylenes (TPHG); and total petroleum hydrocarbons as diesel-extended <br /> (TPHD-extended) analyses. In addition, at least one soil sample from the boring adjacent <br /> to the station. building will be submitted for chlorinated solvents (Environmental <br /> Protection Agency [EPA] Method 8010) and PCBs (EPA Method 8080) analyses. <br /> Each soil boring will be advanced to first-encountered groundwater (anticipated to be <br /> approximately 7 feet below ground surface), and a grab groundwater sample will be <br /> collected from the boring with a HydroPuncho sampler. The water samples will be <br /> analyzed for TPHG, BTEX, TPHD-extended, and chlorinated solvents. <br /> Drilling and sampling equipment will be decontaminated between borings. Following soil <br /> and groundwater sample collection, the borings will be backfilled with cement-bentonite <br /> grout. <br /> SAC/PJM52/09520920.2AM-9411fcA <br />