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California gional Water Quality Cont& Board <br /> Central Valley Region <br /> Qa; Karl E.Longley,ScD,P.E.,Chair 0 <br /> Linda S.Adams Arnold <br /> Secretaryfor Sacramento Main Office Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> Protection <br /> htip://www.waterboards.ca.gov/centraIvaIley <br /> IR, ���S(.���r� (uJ <br /> 22 March 2007 � <br /> MAR 2 0' 2007 <br /> Ms. Anne Conner ENVIROo`%4ENi ;-IEALIH <br /> Pacific Gas and Electric Company PERK-K/SERVICES <br /> 375 North Wiget Lane, Suite 200 <br /> Walnut Creek, California 94598 <br /> REVIEW OF GROUNDWATER MONITORING PROGRAM EVALUATION PLAN, FORMER <br /> CLASS II SURFACE IMPOUNDMENTS, MCDONALD ISLAND GAS STORAGE FACILITY <br /> The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br /> Groundwater Monitoring Program Evaluation Plan for the Former Class II Surface <br /> Impoundments located at the McDonald Island Gas Storage Facility. Staff concurs with the <br /> Evaluation Plan as indicated in the staff email sent 20 March 2007. The Evaluation Plan <br /> proposes to sample other potential sources of Na, Cl, and SO4, such as river water and onsite <br /> irrigation water, for use in chemical mixing models. Staff concurs investigating these potential <br /> sources is appropriate. <br /> If you have any questions please call me at (916) 464-4737. <br /> Todd A. D Frate <br /> Engineering Geologist <br /> Waste Discharge to Land Unit <br /> Lower San Joaquin River Watershed <br /> cc: Robert McClellon, San Joaquin County Environmental Health Division, Stockton <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />