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California egional Water Quality Co of Board <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670.6114 Arnold <br /> Secretary for Phone(916)464-3291 •FAX(916)4644645 Schwarzenegger <br /> Environmental http://www.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> L L_M <br /> 30 April 2009 MAY 0 4 2009 <br /> P.E. <br /> ENVIRONMENT PERMIT/SERVICES <br /> HEALTH <br /> Michael Carroll,o , <br /> San Joaquin County Public Works <br /> Solid Waste Division <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF THIRD AND FOURTH QUARTER 2008 GROUNDWATER AND SURFACE <br /> WATER MONITORING REPORT FOR THE HARNEY LANE SANITARY LANDFILL <br /> The Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> has reviewed the 3rd and 4th Quarter 2008 Groundwater and Surface Water Monitoring <br /> Reports for the Harney Lane Sanitary Landfill. The reports were prepared in accordance with <br /> Monitoring and Reporting Program No. 96-139. Two volatile organic compounds (VOCs) <br /> benzene and toluene were detected in wells MW-2 and MW-4 during the 3rd quarter event. <br /> Toluene was also detected in well MW-1 during this sampling event. Re-samples collected <br /> from wells MW-1 and MW-4 did not confirm the detections. No VOCs were detected in <br /> groundwater during the 4th quarter sampling event. However, several increasing trends were <br /> reported for well MW-2 during the 3rd and 4'h quarter events including: electrical conductivity, <br /> turbidity, TDS, chloride, and bicarbonate alkalinity. Increasing concentrations of these <br /> constituents is an indication that leachate derived from the landfill is affecting groundwater <br /> beneath the site. <br /> Staff is concerned the Discharger continues to identify VOC detections and increasing trends <br /> of inorganics as laboratory contaminants or change in background conditions without <br /> considering the unlined landfill situated atop groundwater. Based on staffs experience, <br /> landfills constructed with an appropriate cover will sufficiently retard downward migration of <br /> meteoric water, lessening the chance for the formation of either landfill gas or leachate. Add a <br /> robust landfill gas extraction system that removes and controls a significant percentage of the <br /> gas generated within the landfill and the result is minor detections of contaminants of concern <br /> including low concentrations of VOCs that are sporadically detected through time. <br /> Staff makes these comments in hope that the Discharger will take a more realistic review of <br /> the data and provide appropriate evaluations and recommendations to corrective action. In <br /> June 2007, the Discharger proposed installing two additional LFG collection wells in response <br /> to continued VOC detections in well MW-2. These wells were approved by staff. Based on <br /> furthevimprovement of detectable VOCs in well MW-2 during the 2nd quarter 2008 sampling <br /> event, the Discharger requested a delay in construction of the wells. This delay was granted <br /> by staff. <br /> CIWQS vID#816271 <br /> California Environmental Protection Agency <br /> 0p6 Recycled Paper <br />