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1710 Main Street <br />Escalon, CA 95320 <br />Phone: (209) 838-3507 <br />FAX: (209) 838-3509 <br />SITE BACKGROUND <br />EXECUTIVE SUMMARY <br />Proposed Remedial Action <br />620 San Juan Drive, Stockton, CA <br />Site Code: 2001 <br />May 10, 1993 <br />NESMA <br />Working To Restore Nature <br />On May 27, 1986, two 1,000 -gallon steel underground fuel storage tanks were removed from <br />the project site. Samples collected during the removal indicated that soil and perhaps <br />groundwater in the vicinity of the tanks had been impacted by petroleum hydrocarbons. <br />Subsequent investigations included drilling 7 soil borings and installing 3 groundwater <br />monitoring wells for collection of soil and groundwater samples. Approximately 250 to 300 <br />cubic yards of soil in the vicinity of the former tanks may have been impacted by hydrocarbons <br />to a depth of approximately 10 feet. Sampling of the groundwater monitoring wells over a two <br />year period indicates that groundwater beneath the site has not been contaminated. <br />PROPOSED REMEDIAL ACTION <br />To cleanup the remaining soil contamination, soils in the vicinity of the former tanks will be <br />excavated with a backhoe tractor. Excavated soils will be stockpiled on site, placed on and <br />covered with thick plastic. Samples will be collected from the sides of the excavation to ensure <br />all contaminated soil has been removed and from the excavated soil to determine proper <br />handling. Depending on contaminant levels, the soil will be treated on site under permit from <br />the Regional Air Board, or disposed of in a state licensed land; ll or disposal facility. <br />Due to shallow groundwater, it may be necessary to dewater the excavation pit by pumping <br />water into a large tank stored on site. The water will be sampled and depending upon laboratory <br />results, either disposed of in the City's sanitary sewer or a state licensed disposal facility. <br />The excavation pit will be backfilled with clean illi or .remediated soil in accordance with City <br />and County regulations. Perimeter fencing will be temporarily installed, if necessary, to prevent <br />physical dangers associated with an open excavation. <br />PSR-593.FNL <br />