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IEmcon Associates <br /> ' 1433 North Market Boulevard •Sacramento,California 95834-1943 . (916)928-3300• Fax(916)928-3341 <br /> . .:... ..J '� f <br /> C ,4 November 9, 1994 <br /> Project 0952-091.02 <br /> At Y <br /> Mr. Steve Sasson <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 288 <br /> 455 North San Joaquin Street <br /> Stockton, California 95201 <br /> Re: Proposed Assessment Activities, British Petroleum (BP) Station Number 11193, <br /> 3202 West Hammer Lane, Stockton, California <br /> Dear Mr. Sasson: <br /> EMCON Associates (EMCON) is proposing to sample two 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 /> Soil borings will be located approximately at the locations shown on the attached site map. <br /> One soil boring will be in the vicinity of the underground storage tanks (USTs), and one <br /> soil boring will be in the vicinity of the waste oil UST. <br /> Soil samples will be collected at approximately 5-foot intervals from each boring using a <br /> stainless steel geoprobe sampler. Up to two soil samples from each boring will be analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHG); benzene, toluene, ethylbenzene and <br /> xylenes (BTEX); and total petroleum hydrocarbons as diesel-extended (TPHD-extended). <br /> In addition, at least one soil sample collected from the boring adjacent to the waste oil <br /> UST will be analyzed for chlorinated solvents (Environmental Protection Agency [EPA] <br /> Method 8010), and polychlorinated biphenyls (EPA Method 8080). <br /> Each soil boring will be advanced to first-encountered groundwater (anticipated to be <br /> approximately 17 to 18 feet below ground surface), and a grab groundwater sample will <br /> be collected from the borings with a HydroPunch° sampler. The water samples will be <br /> analyzed for TPHG, BTEX, and TPHD-extended. The groundwater sample collected from <br /> the boring adjacent to the waste oil tank will also be analyzed for chlorinated solvents. <br /> All drilling and sampling equipment will be decontaminated between borings. Following <br /> soil and groundwater sample collection, the borings will be backfilled with cement- <br /> bentonite grout. <br /> SAC/piU095Z\095209102am-94 pas:1 is <br />