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a _ <br /> MW RA <br /> 2.0 ASSESS <br /> In order to assess the lateral extent of the ground water <br /> contamination associated with this site, WEGE drilled and <br /> constructed seven more monitoring wells (see FIGURE 3A) during the <br /> weeks February 17 thru March 3, 19sg. Concurrent with the Phase <br /> II study, T&C began construction and remodeling of the station. <br /> Subsequent to this second part of Phase II work and construction, <br /> EXXON, Inc. is operating the station, dispensing regular, <br /> unleaded, and premium unleaded gasolines. <br /> 2.2 INVESTIGATIVE MMODS <br /> WEGE"s investigative methods consist of: <br /> A. Exploratory borings, physical analysis of soil (during <br /> the drilling process and in the laboratory) and monitor <br /> well construction (placement, continuous monitoring, <br /> etc. ) . <br /> B., Chemical analysis of soi' and water samples analyzed by <br /> / a State of California Department of Health Services (DFIS) <br /> approved laboratory (McLaren Laboratories of Rancho <br /> Cordova, CA. ) . <br /> C. Verbal communication with WCC, TSMC, and San Joaquin <br /> Environmental Health personnel. <br /> 2.2 FIELD INvESTIGATION <br /> Upon permission from the Environmental Health Division of San <br /> Joaquin County and WdC, WEGE commenced drilling, sampling and <br /> construction of seven monitor wells on February 16, 1989, _9 <br /> and MW-10 were drilled on site while MW-5 through MW-9 were <br /> drilled off site to the north, south, west, and east (see FIGURE <br /> 3A). <br /> Each boring was advanced with 10" diameter, hollow stem au-srs <br /> powered by a truck mounted Mobile drill rig. Soil from tach <br /> boring was logged in accordance with the Unified Soils <br /> Classification System (see Bore Hole Logs; Appendix A) . Soil <br /> sazlplr, . were collected by driving an 18 inch long, 2.5 inch <br /> diame._r, California standard sampler fitted with three 2 inch <br /> diameter, 6 inch long brass liners. The number of blows required <br /> to advance the sampler one foot is .recorded on the Bore Hole Log <br /> as "blows/ft.". The soil samples (contained) in the brass liners) <br /> were sealed with aluminum foil, plastic caps, duct tape, and <br /> placed in an insulated container with dry ice. Each sample <br /> interval (soil sample collected) is represented in the DEPTH <br /> column of the Bore Hole Log. Drilling spoils (cuttings) were <br /> LP <br />