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rO6lll& UOJ Mfu <br /> a electric Company <br /> 375 North Wiget Lane <br /> Walnut Creek.CA 94598-2 <br /> October 9, 2007 <br /> Mr. Todd A. Del Frate, Engineering Geologist <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive #200 <br /> Rancho Cordova, CA 95670-6114 <br /> Subject: Work Plan for Soil and Groundwater Characterization under Pond 3 <br /> PG&E McDonald Island Gas Storage Facility <br /> McDonald Island, California <br /> Dear Mr. Del Frate: <br /> Pacific Gas and Electric Company (PG&E) is herewith providing you the subject Work <br /> Plan. This Work Plan follows up on discussions during the meeting among California EPA <br /> Regional Water Quality Control Board — Central Valley Region (RWQCB), PG&E and <br /> MSE Group (MSE) on August 15, 2007. In that meeting MSE presented results and <br /> conclusions from the May 24, 2007 Groundwater Monitoring Program Evaluation Report <br /> (MSE, 2007a) and the July 13, 2007 Semiannual Groundwater Monitoring Report(MSE, <br /> 2007b). The primary conclusion from evaluations detailed in these reports is that current <br /> conditions at the site do not indicate degraded groundwater that is attributed to Pond 3. <br /> However, because these conclusions were based only on data outside the footprint of <br /> Pond 3, PG&E recommended that a soil and groundwater investigation be conducted <br /> within the Pond 3 footprint to establish whether there could be impact to soil or <br /> groundwater that could be attributed to the pond. <br /> PG&E would like to conduct this investigation as soon as possible so that it can be <br /> completed before significant rains could adversely affect fieldwork and so that the results <br /> of the investigation can be expeditiously evaluated and incorporated into the 2007 Annual <br /> Report. We therefore respectfully request your review and approval of this Work Plan by <br /> October 22, 2007. <br /> PG&E appreciates your prompt review of this Work Plan. If you have any questions on <br /> this Work Plan please call the undersigned at (925) 974-4075or Dr. Robert Ellgas of MSE <br /> at(510) 383-9600. <br /> Sincerely, �. n <br /> -7"C"fAnne P. Conner <br /> Senior Project Manager <br />