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1 <br /> Site Assessment Report and Request for Closure 4 <br /> Sears Auto Center No 1288,5110 Pacific Avenue,Stockton,California February 10,2000 <br />' 70 SUMMARY AND CONCLUSIONS <br /> The results of the subsurface environmental assessment conducted at Sears Auto Center No 1288 <br />' are presented below <br /> ■ On November 8, 1999, six DPT soil borings (VA-1 through VA-6)were advanced within <br /> 10 feet of the former new/used oil and gasoline USTs <br /> ■ Soil beneath the site consists predominantly of clay with fine sand lenses encountered at <br /> vanous depths to 20 feet bgs (maximum vertical depth sampled) Groundwater was not <br /> encountered during site assessment activities <br /> ■ Soil samples were collected at 5-foot intervals from the DPT borings The samples from <br /> each boring were analyzed for BTEX, TPH-g, VOCs, and oxygenates <br />' ■ Laboratory analyses indicate an absence of hydrocarbons in native soil beneath the former <br /> USTs, except for the soil sample collected from boring VA-2,which contained TPH-d at a <br /> concentration of 4 8 mg/kg Low levels of metals were detected in all soil samples that were <br /> analyzed <br /> Required PHS/EHD closure documentation is provided in Appendix G Based on the data from this <br />' verification assessment, site closure and no-further-action status is requested for the site for the <br /> following reasons <br /> ■ Petroleum hydrocarbon source removal at the site was completed over four years ago The <br /> USTs and impacted soil were removed in 1985 and 1987 (Appendix A) Product lines, fuel <br /> dispenser islands, and impacted soil were removed in 1994 (Appendix B) <br /> ■ The highest concentrations of compounds originally reported in excavated soil were removed <br /> from the site in November 1994 <br /> ■ Impacted soil was within the upper 2 to 5 feet of the subsurface and attenuates with <br /> increased depth Of the six soil samples collected below the former UST excavations during <br /> this investigation, only one soil sample contained petroleum hydrocarbons (the soil sample <br /> collected at 20 feet bgs from boring VA-2, which containedTPH-d at a concentration of <br /> 4 8 mg/kg) <br /> s Predominantly low-permeability soil encountered at the site reduces the nsk of migration of <br /> any remaining petroleum hydrocarbons <br />' ■ Groundwater was not encountered during site assessment activities <br /> ■ No production wells for municipal, domestic, agriculture, industry, or other uses were found <br /> within 2,000 feet of the site (Appendix H) <br /> 1 <br /> ' 1288VAR doc R CORPORATION <br />