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KLEIMFELEIER <br /> 2 BACKGROUND <br /> The Guild Winery facility is located at One Winemasters'Way in the City of Lodi (Plate 1). <br /> An onsite,500-gallon underground fuel storage tank adjacent to the maintenance shop was <br /> used to fuel trucks and other vehicles during business operations. Use of the tank was <br /> discontinued, and the tank was excavated in 1985. Initial soil sample results indicated the <br /> presence of gasoline related constituents in the soil around the tank excavation. <br /> Kleinfelder was contracted by Guild Wineries and Distilleries (Guild) to conduct <br /> investigations to assess the presence of petroleum hydrocarbons in the soil and ground <br /> water beneath the tank excavation area. <br /> In total, 16 soil borings were drilled along lines radiating from the tank excavation to <br /> estimate the extent of contamination in the unsaturated soil. Each soil sample was <br /> screened in the field with a portable organic vapor detector, and select samples were <br /> submitted for petroleum hydrocarbon analysis. Field vapor readings ranged from 0 to <br /> 1,200 parts per million by volume (ppmv). Total petroleum hydrocarbons were detected at <br /> concentrations ranging from 35 to 4,400 mg/kg. Based on the field screening and analytical <br /> results, a volume of soil approximately 40 feet in diameter beginning 15 feet below the <br /> ground surface and extending to approximately 30 feet below ground surface was estimated <br /> to contain detectable hydrocarbon concentrations. The approximate affected area is shown <br /> on Fiate 2. <br /> Eight wells (MW-1 through MW-8)were installed to assess the presence of hydrocarbons <br /> .� in ground water. Benzene, toluene, ethylbenzene, and xylene (BTFX) were detected in <br /> some of the water samples. Benzene concentrations up to 230 ug/1 were detected in MW- <br /> The feasibility of available remediation alternatives was reviewed for the facility. The <br /> volume of affected soil, the proximity of buildings. and above-ground storage tanks, the <br /> relatively permeable vadose zone soil, and the volatile nature of the contaminants <br /> indicated that remediation of the vadose zone contamination using a vapor extraction <br /> system{ ) Kleinfeldet <br /> proposed <br /> VES was a feasible and coeffective _-_--_- - _---- _-. <br /> - -- <br /> --- -- ---- - ---cost - - ve o Ftion. <br /> installation of a VES system in a report dated July 29, 1986. <br /> '� <br /> .., 113-88-908 3 <br />