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® MONITORING RESULTS <br /> Groundwater <br /> Summary <br /> Groundwater was sampled on January 28, 2013. <br /> No VOCs were reported in the deep aquifer wells. No VOCs were reported in shallow aquifer <br /> wells SB-1, MW-4, and MW-9A 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 chloride, <br /> nitrate as nitrogen, sulfate, TDS, and Magnesium, which were exceeded in deep aquifer area well <br /> MW-6 this quarter. This is an unusual occurrence for this well. No general water quality <br /> parameters were exceeded in any other wells this quarter. <br /> Ten VOCs were detected in impacted on-site well W-5 and six VOCs were detected in impacted <br /> on-site well M -8. All of the VOCs detected in MW-8 were also detected in MW-5. <br /> No VOCs were detected in new off-site monitoring well MW-9A, Three VOCs were detected in <br /> new off-site monitoring well MW-10A, and four VOCs were detected in new off-site monitoring <br /> well MW-11A. All VOCs detected in these wells are among the VOCs found in MW-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 the <br /> County/Caltrans property boundary line,where the influence of the LFG system has been <br /> minimal. As a corrective action measure,the County installed five additional LFG wells installed <br /> in this area in December 2008. Landfill Gas System Information is provided in Appendix H. <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, TDS, and Magnesium this quarter <br /> (Table 3). However,the variation in concentrations are slight, so the reports of"significant trend" <br /> appears to be an artifact of the Sanitas statistical calculations. <br /> Corral Hollow Sanitary Landfill 12 Department of Public Works/Solid Waste <br /> 1�Quarter 2013 Groundwater Monitoring County of San Joaquin—April 15,2013 <br />