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Ms. Anne Conner - 2 - ) 30 December 2008 <br /> PG&E Frencr Camp <br /> three of the borings at about 20 feet below ground surface at'maximum concentrations <br /> of 620 milligrams per kilogram (mg/kg), 6,500 mg/kg, and 2,000 mg/kg, respectively. <br /> These concentrations exceed the San Francisco Bay Regional Water Board <br /> Environmental Screening Levels for gross contamination. Therefore, PG&E must either <br /> clean up the remaining soil contamination or file a deed restriction on the property. By <br /> 27 February 2009, PG&E needs to either submit a work plan to clean up the remaining <br /> soil contamination or inform Regional Water Board staff that it wants to close the Site <br /> with a deed restriction. i <br /> 3. PG&E states that no petroleum hydrocarbons were detected in the grab groundwater <br /> samples collected in April 2007 from borings 131 through B5, but the depth of these grab <br /> groundwater samples is not in the report of findings of that investigation. By <br /> 27 February 2009, PG&E needs to provide the depths of the grab groundwater <br /> samples collected in these borings. <br /> 4. In December 2008, PG&E sent Regional Water Board staff additional information on <br /> the r-earby domestic wells. PG&E states that a water supply well about 1,200 feet <br /> northwest of the Site has a history of contaminant violations and enforcement actions. <br /> By 27 February 2009, PG&E needs to clarify who took enforcement actions against the <br /> supply well and whether the history of contamination is related to activities at the Site. <br /> In summary, by 27 February 2009, please submit clarification on the current use of the onsite <br /> domestic well, a work plan to clean up the remaining soil contamination or PG&E's decision to, <br /> file a deed restriction, the depth of the 2007 grab groundwater samples, and information on <br /> the nearby domestic well. If you have any questions regarding this letter, you may contact me <br /> at (916) 464-4819 or by email at kshelton(a)waterboards.ca.gov. <br /> KRISTI SHI=LTON <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, Lafayette <br />