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�,Po <br /> - GROUNDWATER <br /> TECHNOLOGY, INC. Ii€,III:€! .tr.:lSnsr.�iil.'11u,11',atia rar?.nf C1il.in91.€'.1€;a; S €3€ <br /> April 19, 1991 Project No. 2.02/8x3.7004 <br /> Mr. Kenneth Olds <br /> L.ammersville School District <br /> 16555 West Von Sosten Road <br /> Tracy, CA 95376 <br /> RE: LAMMERSVILLE SCHOOL <br /> SIGN JOAOUIN COUNTY SITE CODE 1749 <br /> Dear Mr.Olds: <br /> Enclosed are the analytical results of confirmation soil samples collected near monitoring wells(MWs)6,7, <br /> and 8 at the Lammersville School site. San Joaquin County Pur,;ic Health Services, Enviroimental Health <br /> Divislon(EHD) had requested,In a letter dated October 1,19-0,that the soil near the three monitorina wells <br /> be resampled and analyzed to confirm the soil character!--ation. <br /> A Groundwater Technology, Inc. geologist collecte'r the three soil samples using ;rand-auger and impact- <br /> sampler techniques on March 6, 1991. The sampling locations MW-6R, MW-7R and MW-8R were within 5 <br /> feet from MVY-6, MW-7 and MW.8 (Figure 1). A 2.5-Inch outside-diameter hand auger was used to bore <br /> down to a depth of approximately 5 feet below grade at each sampling location. <br /> _ A brass tube,2 inches in diameter by 6 inches long,was Inserted In an impactsampler and driven into the <br /> soil at the bottom of each hole to collect a soil sample. Sample depths were 5-5.5 feet in MW-6R and MW- <br /> 7R,and 6-6.5 feet in MW-8R. The brass tubes were capped with aluminum foil and plastic caps,sealed with <br /> duct tape,labeled,and placed on Ice in an insulated container to preserve the samples during transport to <br /> G T EL Environmental laboratories, Inc. (GTEL), In Concord, California for analysis. The samples were <br /> accompanied by a chain-of-custody farm during transport to the laboratory. <br /> The hand auger, Impact sampler and brass tubes were washed with industrial detergent and rinsed with <br /> distilled water prior to collecting each sample. Each Huger hole was backfilled with neat cement to 0.5 foot <br /> below grade. <br /> The soil samples were analyzc-d for benzene,toluene,ethylbenzene,and xylene(BTEX),and total petroleum <br /> hydrocarbons-as-gasollne(TPH-G) using EPA methods 5030/8020 and modified 8015. As recorded in the <br /> attached laboratory report, no BTEX nor TPH-G components were detected In the three soil samples. <br /> This work step completes the requirements for the Problem Assessment Report(PAR)dazed July 16,1990. <br /> Offices rhmuyhnut the f;:s.:Canada and Or tyseas <br /> 1A®i <br />