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Emcon Associates <br /> 1433 North Market Boulevard •Sacramento,California 95834-1943 • (91.6)928-3300•.Fax(916)928-3341 <br /> October 24, 1994 <br /> Project 0952-089.02 <br /> Mr. Harlan Noll } <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 288 OCT 2 6 1994 <br /> 455 North San Joaquin Street <br /> Stockton, California 95201-388 ENVIRONMENTALHEA'_ , <br /> PERMIT/SERVICES. <br /> Re: Proposed Assessment Activities, British Petroleum (BP) Service Station No. 11191, <br /> 1469 East Hammer Lane, Stockton, California <br /> Dear Mr. Noll: <br /> EMCON Associates (EMCON) is proposing to sample up :to four soil borings using cone <br /> penetrometer methods at the BP service station mentioned above. This work is being done as part. <br /> of a property transfer baseline assessment. <br /> Soil borings will be located approximately at the locations shown on the attached site map. One to <br /> two soil borings will be in the vicinity of the underground storage tanks (USTs), and two soil <br /> borings will be in the vicinity of the pump islands. <br /> Soil samples will be collected at approximately 5-foot intervals from each boring using a stainless <br /> steel geoprobe sampler. Up to two soil sarnples from each boring will be submitted for analysis. <br /> The soil samples will be analyzed for total petroleum hydrocarbons as gasoline°(TPHG); benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX); and total petroleum hydrocarbons as diesel-extended <br /> (TPHD-extended). <br /> Each soil boring will be advanced to first=encountered "groundwater' (anticipated to be <br /> approximately 50 feet below ground surface), and.a grab groundwater sample will be collected <br /> from the borings with a HydroPunch° sampler. The water samples will be submitted for TPHG, <br /> BTEX, and TPHD-extended analysis. if.no visual, odor, or photoionization_detector evidence of <br /> impact is encountered in borings HP-.1 through HP-3, a fourth.boring (HB-4) will be located east <br /> of the UST complex; however;a groundwater-sample will'"not be collected from this boring. <br /> - F <br /> Drilling and sampling equipment will be decontaminated between borings. Following soil and <br /> groundwater sample collection, the borings will be backfilled with cement-bentonite grout. <br /> SAC\PJM5M520890.2AS-94 PASA <br />