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ANNUAL SUMMARY <br /> MONITORING <br /> Groundwater <br /> General: <br /> Data from six groundwater monitoring wells drilled in Caltrans right-of-way beyond the County <br /> property(three of which were made permanent) allowed the delineation of the area of <br /> groundwater impact. This information was submitted to Regional Water Quality Control Board <br /> staff in the Evaluation Monitoring Program Report—Phase 2 dated August 21, 2012. <br /> SB-1 (Up-gradient): <br /> All constituents were within the tolerance limits in 2012 with the exception of Bicarbonate <br /> Alkalinity,which was exceeded in the 1St and 2nd quarters of 2012. There are decreasing trends <br /> in the concentrations of Nitrate as Nitrogen, and Sulfate; and increasing trends in EC, and TDS <br /> in well SB-1. No VOCs were reported in well SB-1 this year. <br /> MW-4: <br /> All constituents were within the tolerance limits in 2012 with the exception of Bicarbonate <br /> Alkalinity,which was exceeded in the 1St and 2nd quarters of 2012. There are decreasing trends <br /> in the concentrations of Sulfate and TDS. No VOCs were reported in well MW-4 this year. <br /> MW-5: <br /> Monitoring well MW-5 is a VOC impacted well. All general water quality constituents were <br /> within the tolerance limits in 2012,except for Bicarbonate Alkalinity, which was exceeded in the <br /> 1St quarter 2012. The Bicarbonate Alkalinity exceedence could be interpreted as an influence of <br /> LFG intrusion. The trend analysis indicates an increasing trend in TDS; and a decreasing trend <br /> in Sulfate. <br /> Trend analysis of VOC concentrations indicates increasing trends for three VOCs, decreasing <br /> trends for four VOCs, and no trends for two VOCs. LFG is the source of the VOCs detected at <br /> MW-5. <br /> MW-6: <br /> All constituents were within the tolerance limits in 2012. Trend analysis indicates a decreasing <br /> trend in Chloride and an increasing trend in TDS. <br /> ® No VOCs were reported in well MW-6 this year. <br /> Corral Hollow Sanitary Landfill 17 Department of Public Works/Solid Waste <br /> e Quarter and Annual 2012 Groundwater Monitoring County of San Joaquin—January 15,2013 <br />