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INTERIM REMEDIATION PLAN <br /> Mid-Cal Leasing <br /> 1649 East Channel Street <br /> Stockton, California <br /> 1. 0 INTRODUCTION <br /> In accordance with a request from Mr. Ed Gotelli of Mid-Cal Leasing <br /> (MCL) , Geological Audit Services, Inc. (GeoAudlt) has prepared this <br /> plan for interim remedial procedures. GeoAudzt prepares to excavate <br /> and remove approximately 510 cubic yards of contaminated soil at <br /> 1649 East Channel Street, Stockton, California (the sate) . <br /> 2 .0 BACKGROUND <br /> 2 . 1 Land Use <br /> The site is located in a flat commercial/light industrial area of <br /> central Stockton (Figure 1) . The site is currently vacant (Figure <br /> 2) . A residential area is located northeast of the site. <br />• 2 .2 Tank Removal <br /> It is our understanding that one 8 , 000-gallon diesel tank and one <br /> 10, 000-gallon diesel tank were removed from the site on 7 October <br /> 1988 . Soil contamination was encountered during the tank removal. <br /> The contaminated soil was excavated from the former tank cavity, <br /> analyzed for hydrocarbon contaminants, and disposed of at a <br /> properly licensed landfill facility. <br /> On 12 July 1992 , a 1, 000--gallon gasoline tank was removed from the <br /> site. According to a letter from the San Joaquin County Public <br /> Health Services - Environmental Health Department (PHS/EHD) , soil <br /> samples collected from beneath the tank showed detectable levels of <br /> total petroleum hydrocarbons (TPH as gasoline at 6, 100 ppm) and <br /> volatile aromatics (benzene at 11. 5 ppm; toluene at 430 ppm; <br /> ethylbenzene at 380 ppm; and xylene at 1 , 870 ppm) . <br /> Excavation of the contaminated soil revealed that the site is <br /> underlain by unconsolidated clayey sand to silty sand in the upper <br /> 20 feet. <br /> 2 . 3 Depth to Groundwater <br /> in 1990, groundwater was estimated to lie 65 - 75 feet below <br /> surface grade, (San Joaquin County Department of Public Works, <br />• Flood Control Section, 1990) . Current measurements give a depth to <br /> groundwater of 65 to 66 feet. In an earlier letter to Mr. Ed <br /> Gotelli, dated December 11, 1992 , the PHS/EHD reported that <br /> seasonal high groundwater (1986) at this site was estimated to be <br /> 1 <br />