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SECO www.secorcom INTERNATIONAL 3017 Kilgore Road,Suite 100 S E C O R INCORPORATED Rancho Cordova,CA 95670 916-861-0400 TEL �+ 916-861-0430 FAX February 14, 2006 Mr. Michael J. Infurna Jr., P.G., SREHS San Joaquin County Environmental Health Department Site Mitigation Unit 304 E. Weber Avenue, 3rd Floor Stockton, California 95202-2708 Re: Results of Limited Phase 11 Investigation PG&E - French Camp - General Construction Yard 401 French Camp Road French Camp, California, 95231 SECOR Project No.: 050T.50224.00.0005 Dear Mr. Infurna: w On behalf of Pacific Gas and Electric Company (PG&E), SECOR International Incorporated (SECOR) is pleased to submit to the San Joaquin County Environmental Health Department (SJCEHD) the findings of the Limited Phase II Investigation at the above- referenced location (Site) (Figures 1 and 2). The investigation was performed in accordance with SECOR's Work Plan for Limited Phase 11 Investigation dated December 9, 2005, which was submitted to and approved by SJCEHD. BACKGROUND In June 2005, SECOR performed a Phase I environmental site assessment of the above referenced Site and submitted to PG&E on September 12, 2005 a report entitled Phase I Environmental Site Assessment Report, Pacific Gas and Electric Company, 401 French Camp Road, French Camp, California. The Site has been used by PG&E (lessee) as a general construction yard for pipeline crews in the area since the late 1950s and was purchased by PG&E in 1991. The Phase I revealed that in 1995 PG&E removed one -r concrete aboveground storage tank (AST) (con-vault) with a diesel side and a gasoline side from the location shown in Figure 2. Information obtained from the San Joaquin County Building Department indicated that the con-vault consisted of one 500-gallon gasoline AST and one 1,000-gallon diesel AST. The con-vault reportedly replaced two steel ASTs, which also reportedly contained diesel and gasoline. The date of the replacement was not known. According to Chief Richard Rellios of the French Camp Fire Department, no evidence of leaks or releases was observed at the time of the con-vault removal in 1995. SECOR did not observe any evidence of spills or leaks near the former con-vault location. According to the PG&E Area Foreman, there was no evidence that any waste oils were stored onsite and no evidence of onsite vehicle repairs for over twenty years (limits of his site knowledge). Based on available information the depth to groundwater at the Site is approximately 10 to 20 feet below ground surface. On December 8, 2005, SECOR contacted SJCEHD regarding county requirements for performing a limited Phase II Investigation of the above described site. SJCEHD required a Final Phase II reportIAPG&E\report\Final Phase II report.doc V