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Ms. Anne Conner -2 - _ 25 January 2010 <br /> PG&E French Camp <br /> detection levels at 20 feet bgs. Depth to groundwater is about 30 feet bgs, so the <br /> remaining concentrations in the soil are unlikely to migrate to the groundwater. In <br /> addition, the soil vapor concentrations are below the ESLs, so the risk of vapor intrusion <br /> is unlikely. <br /> 2. Central Valley Water Board ,staff also concurs with PG&E's proposal to excavate the <br /> a <br /> top 10 feet of petroleum hydrocarbon contaminated soil at the Site. As stated in the <br /> 16 December 2009 Board staff letter, PG&E needs to prepare a work plan to.define the <br /> vertical extent of contaminated soil at the Site prior to the excavation. During the >, <br /> 13 January 2010 conference call Board staff agreed to a work plan submittal date of <br /> 26 February 2010. The work plan needs to also include a schedule for the submittal of <br /> the modeling results to determine whether contaminated soil left in place at the.Site <br /> may leach to groundwater. <br /> In summary, PG&E may leave the soil at the Gillit Property in place. By 26 February 2010, <br /> - PG&E needs to-submit-awork-plan.to define the vertical extentof:the,-soil contamination,. <br /> onsite. If you have any questions regarding this letter, you may contact meat (916) 464-4819 <br /> or by email at kshelton cni 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 />