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t " GROUNDWATER <br /> TECHNOLOGY, INC. IultIfalyardIIdw.Suite]10.%Ve tSaer:,mento.CA45t�J1olfi):i7;1,1700 <br /> [:A\Cfl6i372.}i7H] <br /> Project No. 2021899-7004 <br /> October 16, 1990 San Joaquin County Sita Code: 1749 <br /> Mr. Greg Lyon <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P.O. Box 20095' ; <br /> Stockton,CA 95201 ��` <br /> RE; WORK PLATT FOR CONFIRMATION SOIL_SAMPLING �? <br /> Lammersvlile School District <br /> 16555 West Von Sosten Road 'S� y <br /> Tracy, California <br /> Dear Mr.Olds: <br /> which were <br /> This letter presents a work Plan to resample soil near monitoring wells (MWs) 6, 7, and 8,Soil <br /> installed by Groundwater feet during ogy,drilling the <br /> for therthree dsite on June-19,moilitoring wells were submitted t0. o a <br /> collected at depths of 6 7 feet 9 <br /> laboratory for analyses for total petroleum hydrocarbons as-gasoline (TPH G), and benzene, s�luene, <br /> ethylbenzene and xylenes (BTEX)concentrations. <br /> for MW-7 and MW_8 <br /> t a <br /> of hydrocarbons were detected BTEXland TPsamples <br /> H G were detected n hessoil sample collected from MW-6 <br /> of 6 feet. Low concentrations just <br /> ratty <br /> wells,MW-1 through <br /> ata depth°fdrocarbons had be n deter ed inithelsoil same es collect d atl deph s of app oximately 5 <br /> MW-5, is hY <br /> feet, indicating that the soils above the water table in vicinity of the site are probably not impacted by <br /> hydrocarbons. eguttlfrinterpretationtions of TEX nlTPH-G were a <br /> in the watersample collected installation,6, supporting the that only soil in contact with <br /> contaminated water contains detectable concentrations of hydrocarbons at this site. <br /> San Joaquin County Public Health Services,Environmental Health Division(EHD) has requested that the <br /> soils clear MW-6, MW-7 and MW-8 be resampled and analyzed to confirm the soil characterization. <br /> Groundwater Technology proposes to collect the three soil samples using hand-auger and impact-sampler <br /> techniques. Thau ger wl i I be usted to bore dawncaions will be within <br /> to a depth of approximately ly 5 feet below grade. A brass <br /> outside- <br /> diameter hand g <br /> tube,2 inches in diameter by 6 inches tong,will be inserted in an impact sampler and driven into the sol <br /> at the bottom of the hole to collect a soil sample. The brass tube will be capped with aluminum foil and <br /> e in a cooler to preserve the samples during <br /> plastic caps,sealed with duct tape,labeled,and placed on ic <br /> transport to GTEL Environmental Laboratories.Inc.(GTEL)for analysis. The samples will be accompanied <br /> --- by aChain-of-Custody form during transport to the laboratory,and will be analyzed for BTEX and TPH-G <br /> using modified EPA methods 503018020(8015. <br /> - -- -- - <br /> =Mimi at <br /> Offrrss.hnnryhnuf 1hr U.S.,Cmruda crr,i Ur,w.:,�� <br />