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® MONITORING RESULTS <br /> Groundwater <br /> Summary <br /> Groundwater was sampled on July 16, 2012. <br /> No VOCs were reported in the deep aquifer wells. No VOCs were reported in shallow aquifer <br /> wells SB-1, 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 with the exception of Electrical <br /> Conductivity in MW-7. <br /> Six VOCs were detected in impacted well MW-5 and five VOCs were detected in well MW-8. <br /> All of the VOCs detected in MW-8 were also detected in MW-5. <br /> Two VOCs were detected in new monitoring well -10A, and three VOCs were detected in <br /> new monitoring well MW-1 1A. All VOCs detected in these wells are among the VOCs found in <br /> MW-5 and 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 chloride 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 4th 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 /> 3`d Quarter 2012 Groundwater Monitoring County of San Joaquin—October 30,2012 <br />