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MONITORING RESULTS <br /> Groundwater <br /> Summary <br /> Groundwater was sampled on May 21, 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 /> Chloroform was detected in the field blank this quarter. The source of the VOCs in the field <br /> blank is likely from laboratory contamination. <br /> Shallow Aquifer <br /> Summary <br /> No general water quality parameters were exceeded this quarter with the exception of <br /> Bicarbonate Alkalinity in SB-1, and MW-4. The Alkalinity was measured above the <br /> concentration limit in these wells,but there is no primary or secondary maximum contaminant <br /> level (MCLs) for alkalinity; therefore,these exceedances are of concern, but do not pose a <br /> human health risk. <br /> The primary MCL for Nitrate as Nitrogen was exceeded in wells W-5, MW-9A, and MW-l0A <br /> this quarter. The secondary MCL for EC was exceeded in wells MW-4, MW-5, MW-6, MW-7, <br /> and MW-11A this quarter. The secondary MCL was also exceeded for TDS in wells SB-1, MW- <br /> 4, MW-5, MW-6, MW-7, MW-9A, MW-10A, and MW-11A. In addition,the secondary MCL <br /> was exceeded for Sulfate in wells MW-6, and MW-7. <br /> Ten VOCs were detected in impacted well MW-5 and seven VOCs were detected in well MW-8. <br /> All of the VOCs detected in MW-8 were also detected in MW-5. One VOC (Tetrachloroethene) <br /> was detected above its MCL in MW-5 this quarter. <br /> Two VOCs were detected in new monitoring well MW-9A, three VOCs were detected in new <br /> monitoring well MW-10A and six VOCs were detected in new monitoring well MW-11A. All <br /> VOCs detected in these wells are among the VOCs found in MW-5 and MW-8 generally at <br /> 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 /> Corral Hollow Sanitary Landfill 10 Department of Public Works/Solid Waste <br /> 2nd Quarter 2012 Groundwater Monitoring County of San Joaquin—July 30,2012 <br />