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Californig-Degional Water Quality Co of Board <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams Sacramento Main Office Arnold <br /> Secretaryfor 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Environmental Governor <br /> Phone(916)464-3291 -FAX(916)4644645 <br /> Protection hnp://www.waterboards.ca.gov/centralvalley <br /> ,� I '-=j <br /> 28 May 2008 IJ E ,� '\ <br /> MAY 2 0 2008 <br /> Michael Carroll ENVIRONNIEN-14t-ALTH <br /> San Joaquin County Public Works PERt011-/-11ERViCES <br /> P.O. Box 1810 <br /> Stockton, California 95201 <br /> REVIEW OF SECOND SEMESTER AND ANNUAL 2007 GROUNDWATER AND SURFACE <br /> WATER MONITORING REPORT, FOOTHILL SANITARY LANDFILL, SAN JOAQUIN <br /> COUNTY <br /> The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the 2nd <br /> Semester and Annual 2007 Groundwater and Surface Water Monitoring Report for the Foothill <br /> Sanitary Landfill. The report was prepared in accordance with Waste Discharge <br /> Requirements (WDRs) No. R5-2003-0020. According to the 2nd Semester 2007 report, <br /> groundwater in the vicinity of wells MW-1, MW-2R, and MW-3 has contained acetone <br /> concentrations over the last two semi-annual monitoring events. Following the 1st semi-annual <br /> monitoring event, the Discharger conducted a retest of the affected wells, which proved to be <br /> non-detect for VOCs. Following the 2nd semester monitoring event, the Discharger did not <br /> conduct a retest of affected monitoring wells. <br /> The Discharger insists the acetone concentrations in wells MW-1, MW-2R, and MW-3 are due <br /> to laboratory contamination. If laboratory contamination is the cause of the detections, then <br /> the Discharger should take the appropriate steps with their laboratory to minimize the <br /> contamination. Subsequent detections of acetone or any VOCs in groundwater, the <br /> Discharger is required by Title 27 to retest the affected wells and submit the results for review. <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 /> Title 27 Compliance & Enforcement Unit <br /> CIWQS VID#754253 <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />