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MONITORING <br />Shallow Groundwater <br />General: <br />Conditions in the shallow aquifer appear to be improving. <br />SB -1 (Up -gradient): <br />All constituents were within the tolerance limits in 2013. There are decreasing trends in the <br />concentrations of Nitrate as Nitrogen, and Sulfate; and increasing trends in EC, and TDS in well <br />SB -l. No VOCs were reported in well SB -1 this year. <br />MW -4: <br />No VOCs were reported in well MW -4 this year, nor in any year since it was installed except for <br />sporadic reports attributed to laboratory contamination. All constituents were within the tolerance <br />limits in 2013. There are no trends observed in W-4. <br />MW -5: <br />All general water quality constituents were within the tolerance limits at Monitoring well MW -5 <br />in 2013. The trend analysis indicates an increasing trend in TDS and a decreasing trend in Sulfate. <br />Trend analysis of VOC concentrations indicates increasing trends for two VOCs, decreasing <br />trends for three VOCs, and no trends for three VOCs. LFG is the source of the VOCs detected at <br />MW -5. However, data over the last year indicates decreasing concentrations for all VOCs <br />reported. <br />MW -8: <br />All general water quality constituents were within the tolerance limits in 2013. The trend analysis <br />indicates decreasing trends in Chloride, Nitrate as Nitrogen, Sulfate and TDS. <br />Seven VOCs were reported in well MW -8 this year. The VOCs detected in this well are generally <br />among the same VOCs found in MW -5, but at equal or lower concentration. The area around <br />MW -5 is believed to be the source of VOCs at MW -8. <br />Trend analysis of VOC concentrations indicates increasing trends for four VOCs, decreasing <br />trends for one VOC and no trends for three VOCs. <br />Corral Hollow Sanitary Landfill 19 Department of Public Works/Solid Waste <br />4" Quarter and Annual 2013 Groundwater Monitoring County of San Joaquin — January 15, 2014 <br />