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California _ gional Water Quality Contlel Board ' <br /> \� Central Valley Region <br /> Karl E. Longley,ScD, P.E.,Chair <br /> Linda S.AdamsArnold <br /> Sacramento Main Office waraenegger <br /> bnvironyrronmenral <br /> nr1 for 1 1020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 II�'i' <br /> I� I� \�i I GovernorPhone(916)464-3291 • <br /> Prorecaon FAX(916)464-4645 <br /> hit //w++w.waterboards.ca.gov/centra Iva Ile) <br /> FFP v 2007 <br /> ENVIRON10F..NT HEALi H <br /> 26 February 2007 PERMITISERVICES <br /> Ms. Anne Conner <br /> Pacific Gas and Electric Company <br /> 375 North Wiget Lane, Suite 200 <br /> Walnut Creek, Ca 94598 <br /> REVIEW OF ANNUAL 2006 GROUNDWATER MONITORING REPORT FOR THE 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 /> Annual 2006 Groundwater Monitoring Report for the former Class II Surface Impoundments <br /> located at the McDonald Island Gas Storage Facility. The report was prepared in accordance <br /> with Monitoring and Reporting Program (MRP) No. 96-176 and staff finds the report complete. <br /> However, the analytical data presented indicates that groundwater beneath the site continues <br /> to be affected by past discharges associated with the Class II surface impoundments and the <br /> site is not incompliance with Waste Discharge Requirements No 96-176 or the MRP. The <br /> corrective action performed does not appear to have had the desired effect of reducing the <br /> contaminants of concern to background limits developed from upgradient wells MW-4 and <br /> MW-7. Staff understands that PG&E is reviewing the monitoring program and will be <br /> submitting a Monitoring Program Evaluation Report by 16 April 2007. <br /> Please review the Monitoring and Reporting Checklist. If you have any questions please call <br /> me at (916) 464-4737. <br /> Todd A. Del Frate <br /> Engineering Geologist <br /> Waste Discharge to Land Unit <br /> Lower San Joaquin River Watershed <br /> Enclosure(s) Monitoring and Reporting Checklist <br /> cc: Robert McClellon, San Joaquin County Environmental Health Division, Stockton <br /> CIWQS VID#492780 <br /> California Environmental Protection Agency <br /> Zp� Recycled Paper <br />