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Ms. Anne Conner ( -2 22 May 2009 <br /> 7 PG&E French Camp �✓ ` <br /> I <br /> samples from each of the sidewalls at about three and eight feet bgs. If the confirmation soil <br /> sampling indicates additional excavation is necessary, PG&E will over-excavate in that area <br /> and collect additional confirmation soil samples from the floor and sidewalls.- Soil samples will <br /> be compared to San Francisco Bay Regional Water Quality Control Board Environmental'. <br /> Screening Levels (ESLs) for gross contamination. Once PG&E confirms that the cleanup <br /> goals have been met, it will backfill the excavation and prepare a summary report and closure <br /> request and send it to Central Valley.Water Board staff. <br /> Central Valley Water Board staff concurs with the proposal to destroy Site monitoring wells, <br /> destroy the onsite domestic well, drill soil borings, and excavate contaminated soil. PG&E <br /> needs to communicate the soil results with Central Valley Water Board staff prior to backfilling <br /> the excavation. In May 2007; monitoring well MW-1 had one detection of total petroleum <br /> hydrocarbons as gasoline (TPHg) above water quality objectives, but four samples taken since <br /> then were all non-detect. MW-1 had detections of TPH as diesel above water quality <br /> objectives in May 2007 (850 micrograms per liter [pg/L]) and February 2008 (150 p/L), but two. <br /> samples-since=then=were--be low water qu-aIity objective.s.-AI1-othermonitoring-weIIs,have been.;'. - <br /> below water quality objectives for all constituents of concern during all monitoring events. <br /> By 30 September 2009, PG&E needs to destroy the monitoring wells, destroy the domestic <br /> well, drill the soil borings, excavate the contaminated soil, and submit a report of findings with <br /> a request for Site closure. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4819 or by <br /> email at ksheltonCa--)waterboards.ca.gov. <br /> KRISTI SHELTON <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 /> i <br /> i <br /> i <br />