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SECOR www.secor corn <br /> INTERNATIONAL 57 Lafayette Circle,2nd Floor <br /> S E C O R INCORPORATED Lafayette,CA 94549 <br /> 925-299-9300 TEL <br /> 925-299-9302 FAx <br /> March 27, 2007 <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> RE: Work Plan for Additional Soil and Groundwater Investigation <br /> PG&E French Camp General Construction Yard <br /> 401 French Camp Road, French Camp, California <br /> SECOR PN: 050T.50351.01 <br /> Dear Mr. Infurna: <br /> SECOR International Incorporated (SECOR), on behalf of Pacific Gas and Electric <br /> Company (PG&E), has prepared this Work Plan for Additional Soil and Groundwater <br /> Investigation (Work Plan) at the PG&E general construction yard located at 401 French <br /> Camp Road in French Camp, California (the Site, see Figure 1). <br /> BACKGROUND AND PREVIOUS WORK <br /> The Site has been used by PG&E as a general construction yard for pipeline crews <br /> since the late 1950s, and was purchased by PG&E in 1991. In June 2005, SECOR <br /> performed a Phase I environmental site assessment (Phase I ESA) at the Site. The <br /> Phase I determined that in 1995, PG&E removed one concrete aboveground storage <br /> tank (AST) from the Site. The AST was a ConVault-style tank, consisting of separate <br /> vessels for storage of diesel and gasoline. According to on-site PG&E employees, the <br /> ConVault had reportedly replaced older steel ASTs used for storing and dispensing <br /> fuels. <br /> December 2005 Investigation <br /> In December 2005, SECOR completed a limited subsurface investigation to evaluate <br /> soils beneath the former ConVault and steel ASTs for the presence of fuel <br /> hydrocarbons. Soil sample locations are illustrated on Figure 2. Minor concentrations of <br /> diesel- and motor oil-range petroleum hydrocarbons were detected in shallow soils to 2 <br /> feet below ground surface (bgs), and soluble fractions of these constituents were not <br /> present at or above the method reporting limits. Encountered soils consisted of silts and <br /> clays, underlain by a `hardpan' layer at approximately 3.5 feet bgs. Based on the low <br /> chemical concentrations, lack of reportable soluble fractions, and fine-grained soil types, <br /> SECOR concluded that the reported impacts had a very low potential to migrate to <br /> I:\PG&E\French Camp\additional 2007 investigation\work plan\2007 Investigation Work Plan_Final.doc March 27,2007 <br /> Project No.050T.50351.01 <br />