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i <br />III <br />n <br />i <br />C <br />h <br />0 <br />i <br />u <br />u <br />Groundwater <br />Summary <br />Groundwater was sampled on July 18, 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. Data from the shallow aquifer wells beyond the <br />County property seems to support a tentative conclusion that the quality of the water in this <br />aquifer appears to be improving. <br />Shallow Aquifer <br />Summary <br />Conditions are similar to previous quarters. <br />No general water quality parameters were exceeded in any wells this quarter. <br />Seven VOCs were detected in impacted on-site well MW -5 and five 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 />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 two VOCs were detected in new off-site monitoring <br />well MW -1 IA. All VOCs detected in these wells are among the VOCs found in MW -5 and <br />MW -8, generally at lower concentrations. <br />Data from MW -11A is encouraging. Three VOCs previously present were not detected this <br />quarter, indicating an improvement in water quality at this well. The County will review with <br />interest succeeding monitoring data to assess whether we are seeing the start of a trend. <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. . 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 sulfate this quarter, and a <br />"significant increasing" trend is reported for EC, and TDS this quarter (Table 3). However, the <br />Corral Hollow Sanitary Landfill 12 Department of Public Works/Solid Waste <br />3rd Quarter 2013 Groundwater Monitoring County of San Joaquin — October 15, 2013 <br />