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1 <br /> Request for Closure 2 <br /> Sears, Roebuck&Company,Facility#1288,5110 Pacific Ave,Stockton,California March 11,1999 <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 T4-4' <br /> (0 34 mg/kg toluene) from a depth of 4 feet on August 12, 1994 <br /> ■ Predominantly low-permeability soil types at the site (reducing the risk 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 /> 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 />' GEOLOGY AND HYDROGEOLOGY <br />' According to the visual observations during excavation, soil types at the site 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 soil 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 intrinsic 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 /> s <br />' lzaasrw,rtc <br />