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i <br /> transferred to laboratory-cleaned sample containers, sealed with teflon lined caps, and transferred <br /> to cooled storage The samples were then transported under suitable chain-of-custody to a State of <br /> I California certified laboratory for the requested testing A groundwater sample from each monitor <br /> well was analyzed for TPHg and BTEX, by EPA Methods 8015, 8020 respectively <br /> 3 8 Soil Vapor Extraction Pilot Testing <br /> A vapor extraction pilot test was performed on vapor wells Wl, W2, and W4 (Canome, 1993) <br /> IResults indicated that soil vapors can be readily extracted from the vapor wells and that soil <br /> remediation by vapor extraction is feasible for the site The results of the soil vapor extraction pilot <br /> testing performed by Canonie is presented in Appendix C <br /> 4.0 SITE CONDITIONS <br /> 41 Hydrogeology <br /> The site is located on the northern end of the San Joaquin Basin within the Great Valley of <br /> California Geologically, the Great Valley is a large, elongated, northwest trending, asymmetrical <br /> I structural trough that has been filled with a thick sequence of sediment ranging in age from Late <br /> Jurassic to Recent Recent alluvium and lake deposits cover most of the central lower parts of the <br /> Ivalley Generally, the valley is subdivided into two sub-basins, the Sacramento and San Joaquin <br /> Basins, by the cross-valley Stockton fault Drainage from the San Joaquin Basin is through the San <br /> IJoaquin River, which is approximately 3 5 miles southwest of the site <br /> IThe site is underlain by a yellowish-brown to light olive gray, fine to medium grained sand, to a <br /> depth of approximately 15 feet bgs which overlies a very stiff, dark yellowish-brown clay which <br /> Iaverages 5 feet in thickness A medium brown, fine to medium grained sand was encountered from <br /> approximately 20 feet bgs to approximately 30 feet bgs where a silty clay was observed by Canome <br /> IGroundwater is encountered in this sand under unconfined conditions A generalized geologic cross- <br /> section of the site is provided as Figure 7 <br /> I <br /> I TOC 1474 VAI( 6 5):AACOA' <br /> NW05A02-01 M y 31 1994 <br />