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5,0610 x r s 1L]F] (Eiji GROUNDWATER TECHNOLOGY, INC. 1.101 Halyard Drive,Suite 1110.tVestSacramcntn.CA95691.191G1172-1700 FAX!9[61372-8781 October 18, 1990 Project No.2021899.7004 San Joaquin County Site Code; 1749 Mr. Greg Lyon San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 RE: WORK PLAN FOR CONFIRMATION SOIL SAMPLING Lammersville School District 16555 West Von 5osten Road Tracy, California Dear Mr.Olds: This letter presents a work plan to resampte soil near monitoring yells (MWS) 6, 7, and 8, which were installed by Groundwater Technology,Inc. at the above-referenced site on June 19, 1990. Soil samples collected at depths of 6-7 feet during drilling borings for the three monitoring wells were submitted to a laboratory for analyses for total petroleum hydrocarbons-as-gasoline (TPH-G), and benzene, toluene, ethylbenzene and xylenes(BTEX) concentrations. No hydrocarbons were detected in soil samples collected from borings for MW-7 and MW-b at a depth of 6 feet. Low concentrations of BTEX and TPN-G were detected in the soil sample collected from MW-6 at a depth of 7 feet,just below the water table. in all previously installed monitoring wells,MW-1 through MW-5, no hydrocarbons had been detected in the soil samples collected at depths of approximately 5 feet, indicating that the soils above the water table in vicinity of the site are probably not impacted by hydrocarbons. Subsequent to well installation,elevated concentrations of BTEX and T PH-G were detected in the water sample collected from MW-6, supporting the interpretation that only soil in contact with contaminated water contains detectable concentrations of hydrocarbons at this site. San Joaquin County Public Health Services,Environmental Health Division(EHD)has requested that the soils near MW-6, MW-7 and MW-8 be resampled and analyzed to confirm the soil characterization, Groundwater Technology proposes to collect the three soil samples using hand-auger and impact-sampler techniques. The sampling locations will be within 5 feet from MW-6,MW-7 and MW-8. A 2.5-inch outside- diameter hand auger will be used to bore down to a depth of approximately 5 feet below grade. A brass tube,2 inches in diameter by 6 inches long,will be inserted in an impact sampler and driven into the soil at the bottom of the hole to collect a soil sample. The brass tube will be capped with aluminum foil and plastic caps,seated with duct tape,labeled,and placed on ice in a cooler to preserve the samples during transport to GTEL Environmental Laboratories,Inc.(GTEL)for analysis. The samples will be accompanied by a Chain-of-Custody form during transport to the laboratory,and will be analyzed for BTEX and TPH-G using modified EPA methods 50301802018015. - Offices throughout the U.S..Canada and Or peas