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iates <br /> Emcon Assoc <br /> 1433 North Market Boulevard •Sacramento,California 95834-1943• (916)928-3300• Fax(916)928-3341 <br /> October 24, 1994 <br /> Project 0952-090.02 <br /> Mr. Michael InfurnaIJ <br /> San Joaquin County Public Health Services - 1 <br /> "I <br /> Environ'�mental Health Division <br /> P. O. Box 288 OCT 2 6 1994 <br /> 455 North San Joaquin Street <br /> NVIRON,yIE��Tq�HE��LTN <br /> Stockton, California 95201-388 <br /> PERMIT/SERVICES <br /> Re: Proposed Assessment Activities, British ;Petroleum (BP) Service Station No. 11192, <br /> 1403 Country Club Boulevard,Stockton, California <br /> Dear Mr. Infurna: <br /> EMCON Associates (EMCON) is proposing to sample four soil borings using cone penetrometer <br /> methods at the BP service station mentioned above. This work is being done as part of a property <br /> transfer baseline assessment. <br /> Soil borings will be located approximately at the locations shown on the attached site map. One <br /> soil boring will be in the vicinity of the underground storage tanks, one soil,boring will be in the <br /> vicinity of the pump islands, and one boring will be adjacent to each of the auto service buildings. <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 samples from each boring will be analyzed for analysis of <br /> total petroleum hydrocarbons as gasoline (TPHG); benzene, toluene, ethylbenzene and xylenes <br /> (BTEX); and total petroleum hydrocarbons as diesel-extended (TPHD-extended). In addition, at <br /> least one soil sample collected from the borings adjacent to the auto service buildings will be <br /> submitted for analyses of 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 25 feet below ground surface), and a grab groundwater sample will be collected <br /> from the borings with a HydroPuncho sampler. The water samples will be analyzed for analysis of <br /> TPHG,, BTEX, TPHD-extended, and chlorinated solvents. <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 /> Two to four weeks after receiving analytical results, EMCON will submit a letter report to San <br /> Joaquin County Environmental Health Division presenting findings and certified analytical reports. <br /> SAC/PJM52/09520900.2AS-94/pas:4 � <br />