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Request for Closure 2 <br /> Sears,Roetwck&Company,Faclldy#1288,5110 Pacific Ave,Stockton,California March 11,M9 <br /> ■ Soil on site remains below maximum contaminant levels for drinking water standards for <br />' benzene,toluene, ethylbenzene, and xylenes (BTEX), with the exception of sample T44' <br /> (0.34 mg/kg toluene) from a depth of 4 feet on August 12, 1994 <br /> • Predominantly low-permeability sod types at the site (reducing the nsk of vertical and <br /> lateral plume migration) <br /> ■ Groundwater was not encountered during excavation activities <br /> Based on available site information, IT Corporation proposes that this site meets State Water <br /> Resources Control Board criteria for closure as low-nsk Site closure concurrence is therefore <br /> I requested of the San Joaquin County Environmental Health Division(SJCEHD) Attached please <br /> find a UST closure request form (based on Environmental Protection Agency format). <br /> i <br /> GEOLOGY AND HYDROGEOLOGY <br /> the visual observations during excavation soil types at the site <br /> According to g ype consist primarily of <br /> 6 inches of gravel fill over silty, sandy clay to a depth of 5 feet,the maximum depth excavated <br /> Site-specific lithology cannot be determined as the maximum depth explored was 5 feet <br /> Groundwater was not encountered during excavation activities <br /> CLOSURE GOALS <br /> In alignment with current SJCEHD and State UST Reimbursement Fund policies, the goals of <br /> hydrocarbon -remediation at this site include. 1) removal of the primary source of the hydrocarbon <br /> impaction (USTs), removal of product lines, used-oil lines, and all fuel dispensers, 2) removal of <br /> impacted sod off-site, and 3) delineation of plume migration. <br /> Hydrocarbon Source Removal <br /> The original hydrocarbon source at this site (the gasoline underground storage tanks)was removed <br /> in February 1985 (13 years ago) Once the hydrocarbon source has been removed, hydrocarbon <br /> concentrations in sod usually decline over time in response to natural intnns,c biodegradation The <br /> former UST outline can be seen in figure 2 The gasoline UST removal was performed by a different <br /> consultant and data from this work is not available In August 1994, the fuel dispenser islands, <br /> product lines, oil supply lines, and the used-oil lines were removed and soil conditions were assessed <br /> 128851kaAc <br />