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i <br /> The groundwater investigation included the installation of eight monitoring wells (Figure 1) and revealed <br /> that gasoline constituents had migrated from the underground tanks into the shallow groundwater. The <br /> shallow groundwater surface was found to exist at approximately 75 feet below ground surface within fine <br /> sandy silts, clayey silts and sand. Groundwater was observed to flow northwesterly at a gradient between <br /> 0.0005 and 0.0013. <br /> As reported in the RI/FS, benzene was found to exceed the hazardous waste Toxicity Characteristic <br /> Leaching Procedure (TCLP) level for benzene of 500 µg/1 in Monitoring Wells MW-DIS-1 and -2. <br /> Benzene concentrations in Monitoring Wells MW-DIS-1, -2, -3, and -7D have exceeded the California <br /> Maximum Contaminant Level (MCL) for benzene of 1 µg/1 <br /> Del Monte submitted a conceptual remediation plan to Michael Collins of San Joaquin County Public <br /> Health Services (PHS) on August 19, 1993. The remediation plan specifies air sparging combined with <br /> soil vapor extraction (AS/SVE) to remediate the source of gasoline constituents in the subsurface beneath <br /> the Disco Property. <br /> i <br /> I <br /> I <br /> s <br /> j <br /> I <br /> I <br /> 2 r <br /> SF01001385F.WP5 <br /> s <br /> a <br />