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MONITORING RESULTS <br /> Groundwater <br /> Summary <br /> Groundwater was sampled on October 15, 2012. <br /> No VOCs were reported in the deep aquifer wells. No VOCs were reported in shallow aquifer <br /> wells SB-1 and MW-4 this quarter. <br /> Shallow Aquifer <br /> Summary <br /> Conditions are similar to previous quarters. <br /> No general water quality parameters were exceeded this quarter. <br /> Nine VOCs were detected in impacted on-site well MW-5 and six VOCs were detected in <br /> impacted on-site well MW-8. All of the VOCs detected in MW-8 were also detected in MW-5. <br /> One VOC was detect in new off-site monitoring well MW-9A, Three VOCs were detected in <br /> new off-site monitoring well MW-10A, and five VOCs were detected in new off-site monitoring <br /> well MW-11A. All VOCs detected in these wells are among the VOCs found in W-5 and <br /> MW-8 generally at lower concentrations. <br /> The source of these VOCs is apparently from LFG emanating from the refuse discovered near <br /> the property boundary line,where the influence of the LFG system has been minimal. As a <br /> corrective action measure,the County installed five additional LFG wells installed in this area in <br /> December 2008 and has since increased the collection rate from those wells. <br /> SB-1(Up gradient): <br /> Concentrations of all the parameters analyzed were within established concentration limits this <br /> quarter(Table 1). <br /> A"significantly decreasing"trend is reported by the Sanitas program for nitrate and sulfate this <br /> quarter, and a"significant increasing"trend is reported for EC, and TDS this quarter(Table 3). <br /> However,the variation in concentrations are slight, so the reports of"significant trend" appears <br /> to be an artifact of the Sanitas statistical calculations. <br /> No VOCs were reported at SB-1 this quarter. A trace concentration of one VOC was reported in <br /> this well in the 4t`Quarter 2011. With this one exception, VOCs have not been reported in this <br /> well since second quarter 2004 when trace concentrations of one VOC was reported. <br /> Corral Hollow Sanitary Landfill 10 Department of Public Works/Solid Waste <br /> 4te Quarter and Annual 2012 Groundwater Monitoring County of San Joaquin—January 15,2013 <br />