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California P-;ional Water Quality Contr"l Board <br /> Central Valley Region <br /> Katherine Hart,Chair A Arnold <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Secretaryfor Phone(916)464-3291•FAX(916)464-4645 !� Governor <br /> Environmental http://www.waterboards.ca.gov/centralvalle}-I�'CE�V <br /> LVf <br /> Protection IunuS�i 1-- <br /> 17 February 2010 MAR 0 3 2010 <br /> ENVIRONMENT <br /> N FERMHEALTH <br /> IT/SERVICES <br /> Ms. Anne Conner <br /> Pacific Gas and Electric Company <br /> 3401 Crow Canyon Road <br /> San Ramon, CA 94583 <br /> WORK PLAN FOR ADDITIONAL SITE CHARACTERIZATION, PG&E FRENCH CAMP <br /> GENERAL CONSTRUCTION YARD, FRENCH CAMP, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Centra(Valley Region (Central"VaPley Water <br /> Board) staff reviewed the 9 February 2010 Work Plan for Additional Site Characterization <br /> (Work Plan) submitted by Stantec Consulting Corporation (Stantec) on behalf of Pacific Gas & <br /> Electric Company (PG&E) for the general construction yard at 401 East French Camp Road in <br /> French Camp (Site). <br /> PG&E has used the Site since the late 1950s as a general.construction yard and purchased <br /> the property in 1991. In June 2005, PG&E performed a Phase I environmental site <br /> assessment, which found that in 1995, PG&E removed one concrete ConVault-style <br /> aboveground tank (AGT). The ConVault tank had replaced older steel AGTs and consisted of <br /> separate vessels for storing diesel and gasoline. The French Camp Fire Department oversaw <br /> the 1995 removal of the ConVault AGT. It is unknown when the steel AGTs were removed. <br /> Central Valley Water Board staff concurs with the proposal in the Work Plan to drill three soil <br /> borings to first encountered groundwater at the Site. The Work Plan states that PG&E will <br /> collect soil samples from 10 feet below ground surface (bgs) to about 28 feet bgs to provide <br /> vertical delineation of the contaminated soils. Following analysis of the soil samples, PG&E <br /> plans to conduct modeling using VLEACH to estimate the mobilization and migration of any <br /> remaining contaminants in the soil at the Site. By 30 May 2010, PG&E needs to drill the soil <br /> borings, collect and analyze the soil samples, conduct the modeling, and submit a report of <br /> findings. PG&E needs to collect-an adequate number of soil samples to define the vertical <br /> extent of the soil contamination at the Site. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4819 or by <br /> email atAksshelton(cD-waterboards.ca.gov. <br /> KRISTI SHELTON, P.E. <br /> Water Resources Control Engineer <br /> Aboveground Tanks Cleanup Unit <br /> cc: Mr. Michael Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Neil Doran, Stantec, Rancho Cordova <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />