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Fm <br /> SECOR www.secor.com <br /> INTERNATIONAL <br /> S E C O R INCORPORATED 57 Lafayette Circle,2nd Floor <br /> Lafayette,CA 94549 <br /> 925-299-9300 TEL <br /> 925-299-9302 FAX <br /> March 9, 2007 <br /> GI�U��� <br /> Ms. Anne Conner <br /> Pacific Gas and Electric Company MAR 1 2 2007 <br /> Environmental Affairs ENVIRONMENT NEAL(H <br /> 375 N. Wiget Lane PERMIT/SERVICES <br /> Walnut Creek, California 94598 <br /> RE: Results of Soil Removal Action <br /> r PG&E French Camp General Construction Yard <br /> 401 East French Camp Road <br /> French Camp, California <br /> SECOR PN: 050T.50351.00 <br /> Dear Anne, <br /> SECOR International Incorporated (SECOR) has. prepared this letter report describing <br /> recent soil removal activities at the Pacific Gas & Electric Company (PG&E) general <br /> construction yard located at 401 East French Camp Road in French Camp, California (the <br /> Site; see Figure 1). SECOR's proposal and cost estimate dated November 28, 2006, <br /> provided the basis for the work performed at the Site, and SECOR was retained by PG&E <br /> under contract work authorization number 3500754039. <br /> BACKGROUND <br /> The Site has been used by PG&E as a general construction yard for pipeline crews since <br /> the late 1950s and was purchased by PG&E in 1991. In June 2005, SECOR performed a <br /> Phase I environmental site assessment (Phase I ESA) at the Site. The Phase I determined <br /> that in 1995, PG&E removed one concrete aboveground storage tank (AST) from the Site. <br /> The AST was a ConVault-style tank, consisting of separate vessels for storage of diesel <br /> and gasoline. The ConVault had reportedly replaced older steel ASTs used for storing and <br /> dispensing fuels. <br /> r In December 2005, SECOR completed a limited subsurface investigation to evaluate <br /> W chemical concentrations in soils beneath the former ConVault and steel ASTs. Soil sample <br /> locations are illustrated on Figure 2. Minor, concentrations of diesel- and motor oil-range <br /> Lpetroleum hydrocarbons were detected in. shallow soils to 2 feet below ground surface <br /> (bgs), and soluble fractions of these constituents were not present at or above the method <br /> reporting limits. Encountered soils consisted of silts and clays, underlain by a 'hardpan' <br /> layer at approximately 3.5 feet bgs. Based on the low chemical concentrations, lack of <br /> reportable soluble fractions, and fine-grained soil types, SECOR concluded that the <br /> reported impacts had a very low-potential to migrate to groundwater. <br /> I:\PG&E\French Camp\2007 Investigation\report\Excavation Report_Final.doc March 9,2007 <br /> { Project No.050T.50351.00.0003 <br />