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® MW-3 (Directly Down-Gradient) <br /> Samples were not collected from MW-3 during the second semester 2012 sampling event due to <br /> a lack of water required from analysis. Samples will be collected during the next sampling event <br /> if enough water is present for collection. This well will be replaced this year. <br /> MW-4 <br /> Concentrations of all the parameters analyzed were within established concentration limits this <br /> semester except for Turbidity (Table 1). <br /> The trend analysis by Sanitas software indicates increasing trends for pH, Turbidity, TDS, and a <br /> decreasing trend for Chloride during the second semester 2012 sampling event. <br /> However, as presented below, it is likely the increasing trend in these parameters appears to be <br /> due to be the treatment ponds of the migrant labor camp and not the landfill. <br /> One VOC (Acetone)was detected in MW-4 during the second semester 2012 sampling event <br /> conducted on July 30, 2012. Acetone is a common laboratory contaminant. <br /> MW-5 <br /> No general water quality parameter concentration limits were exceeded during the second <br /> semester 2012 sampling event. <br /> A trace concentration of PCE and above trace concentration of CFC-12)were reported in MW-5 <br /> during the second semester 2012 sampling event. <br /> MW-5 was installed between the sewage treatment ponds of the migrant labor camp and the <br /> "Secondary Landfill" portion of the site. The purpose of this well is to determine if the treatment <br /> ponds were contributing constituents to groundwater. <br /> MW-6 <br /> No general water quality parameter concentration limits were exceeded during the second <br /> semester 2012 sampling event. <br /> No VOCs were detected in MW-6 during the second semester 2012 sampling event. <br /> MW-6 was installed upgradient of the treatment ponds to serve as a background well for the site, <br /> especially to address RWQCB staff concerns regarding increased alkalinity due to landfill gas. <br /> Evaluation of Impact to Groundwater by Wastewater Treatment Ponds <br /> A review of the general chemical constituents indicates that the treatment ponds appear to act as <br /> a source of constituents in groundwater. In general, several constituents are lower in background <br /> well MW-6, then rise in well MW-5, and then fall in well MW-4 (see table below). <br /> Harney Lane Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2012 Groundwater Monitoring Report County of San Joaquin—January 25,2013 <br />