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PURPOSE <br /> The purpose of this report is to document the progress of the Landfill Cover and Landfill Gas <br /> Collection System, as corrective action measures at the Harney Lane Sanitary Landfill, in <br /> preventing leachate and landfill gas (LFG) from migrating from the landfill into the vadose zone <br /> and contaminating groundwater. <br /> The criterion for success of the corrective action measure is "no statistically significant upward <br /> trend"of any monitoring parameter in MW-2, as established by the Evaluation Monitoring <br /> Program. <br /> RESULTS <br /> The County has met the criteria of"no statistically significant upward trends" in any constituents <br /> in MW-2 when the data from implementation of the corrective actions measure(December 1995) <br /> is considered This data was evaluated using the Sen's Slope and Mann-Kendall Trend Analysis <br /> Methods (Appendix A). <br /> Quarterly monitoring results show that the landfill's final cover and LFG system are preventing <br /> migration of leachate and LFG from the landfill to the groundwater. A consistent decrease in the <br /> concentrations of inorganic constituents and VOCs in the groundwater is noted, starting <br /> 18 months of LFG Collection System operation (Figures 3 and 4). The County anticipates a <br /> continued reduction in the concentrations of inorganics and VOCs in groundwater at monitoring <br /> well MW-2 as a result of the reduction of leachate and LFG (and associated VOCs) in the vadose <br /> zone. <br /> BACKGROUND <br /> Current Monitoring Program <br /> The Harney Lane Sanitary Landfill(HLSL) is an unlined,municipal solid waste landfill located <br /> approximately nine miles east of Lodi, California(Figure 1). The HLSL is currently monitored <br /> through an Evaluation Monitoring Program,under Waste Discharge requirements (WDRs) <br /> Order No. 96-139. The monitoring system consists of one upgradient(MW-1) and three <br /> downgadient(MW-2,MW-3, and MW-4)wells (Figure 2). <br /> Impact on Groundwater <br /> Groundwater contamination was detected in MW-2 in the first quarter of 1994 (Appendix B). <br /> Continued monitoring revealed statistically significant increasing trends of inorganic constituents <br /> and repeated detections of volatile organic compounds (VOCs) - evidence of impact to <br /> groundwater by the landfill. <br /> Progress of Corrective Action Measures 1 Harney Lane Sanitary Landfill <br /> Revised-August 22,2003 County of San Joaquin <br />