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In October and November 1988, four soil borings were drilled at the site, with one located in <br /> the backfilled tank pit and three surrounding the former tank location (Figure 3) Upon <br /> analysis of soil samples collected from these borings, diesel fuel and/or its volatile <br /> constituents were encountered The greatest diesel concentrations were encountered in the <br /> samples collected from the former tank location The deepest sample collected from this <br /> borehole (40 feet bgs) revealed no detectable diesel concentrations upon analysis Analytical <br /> reports for this investigation can be found in Versar Inc's "Site Assessment of the Pacific <br /> Bell Ashley Road, Stockton Facility (UE132)," 1989 <br /> In January 1991, four soil vapor extraction wells were installed at the site in a distribution <br /> similar to the soil borings Soil samples collected during installation of the wells revealed <br /> diesel concentrations in samples from three of the wells The greatest concentration of diesel <br /> fuel (4,900 ppm) was encountered at 25 feet below grade in well MW-6, located in the <br /> former tank location The two underlying samples from this well, collected at 35 and 40 feet <br /> below grade, revealed no detectable diesel concentrations No detectable volatile petroleum <br /> constituents were encountered in any sample Analytical reports for these samples can be <br /> found in Versar's "Interim Remediation Pilot Study Report", 1992 <br /> The soil vapor extraction system was in operation for a total of 66 days and extracted 0 5 <br /> gallons of diesel fuel from the subsurface <br /> In October 1993, two soil borings were drilled by IT through the former tank location to a <br />' depth of 40 feet below grade Soil samples were collected at 10 foot intervals and upon <br /> analysis only one sample, collected at 15 feet below grade revealed detectable diesel <br /> concentrations (2,900 ppm) No detectable volatile petroleum constituents were encountered <br /> in any soil sample A groundwater sample was collected from the onsite water well which <br /> upon analysis revealed no detectable petroleum hydrocarbons Analytical reports for these <br /> samples can be found in IT Corporation's "Supplemental Investigation Report", 1993 <br /> 1 4.0 Current Site Activities <br /> The scope of work for the current soils excavation/remediation project included the removal <br /> of fill from the former tank excavation, removal of underlying diesel impacted native soils, <br /> verification sampling, backfilling, compaction, site restoration, and disposal All work was <br /> performed in accordance to State of California and San Joaquin County regulations. <br /> M7JO1-27-95/USTI95-0011 nbr 2 <br />