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I <br /> 1 <br /> QUARTERLY REPORT <br /> January 1994 <br /> Mid-Cal Leasing <br /> 1649 East Channel Street <br /> Stockton, California <br /> I <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr Ed Gotelli of NVIid-Cal Leasing (MCL), personnel <br /> from Geological Audit Services, Inc. (GeoAudit) have performed quarterly groundwater <br /> monitoring procedures at 1649 East Channel Street in Stockton, California (the site) for the <br /> fourth quarter of 1993. The project background, procedures, findings, and conclusions are <br /> presented in the following sections <br /> 2.0 PROJECT BACKGROUND <br /> 2.1 Land Use <br /> The site is located in a flat, commercial/light industrial area of central Stockton (Figure 1) <br /> The site is currently vacant and undeveloped A residential area is located northeast of the <br /> site <br /> 2.2 Tank Removal, October 1988 <br /> It is our understanding that one 8,000-gallon diesel tank and one 10,000-gallon diesel tank <br /> were removed from the site on October 7, 1988 Soil contamination was encountered during <br /> the tank removal The contaminated soil was excavated from the former tank cavity The <br /> excavated soil was characterized and disposed of at a properly licensed landfill facility <br /> On October 7, 1988, a 1,000-gallon gasoline tank was removed from the site According to <br /> a letter from the San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS/EHD), soil samples collected from beneath the tank showed detectable levels <br /> of total petroleum hydrocarbons (TPH as gasoline at 6,000 ppm) and volatile aromatics <br /> (benzene at 115 ppm, toluene at 430 ppm, ethylbenzene at 380 ppm, and xylenes at 1,870 <br /> ppm) The location of the former tank excavation is presented as Figure 2 <br /> 2.3 Depth to Groundwater <br /> Groundwater was estimated at 65 - 70 feet below surface grade by San Joaquin County <br /> c.alopral A.&S.—].c. y <br /> 161!2 94?hQ,d1 QA 1 <br />