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MW-3 <br /> No general water quality parameters were exceeded in MW-3 this quarter. <br /> An increasing trend in Chloride continues this quarter; however, Chloride concentrations are <br /> generally lower in the past ten quarters. Because this fluctuation also occurs in the upgradient well, <br /> we believe that changes in groundwater quality are due to natural fluctuation of groundwater quality <br /> in the region. This was noted in previous reports (beginning with the second quarter 2004) and <br /> continues at present. <br /> An increasing trend in turbidity was also noted this quarter. However, it is unlikely that the <br /> increasing tend in turbidity is a result of landfill activities. The increase in turbidity could be due to <br /> siltation within the well. This trend will be monitored in future reports to determine if action is <br /> necessary. <br /> No VOCs were reported in MW-3. VOCs, other than false positives,have not been reported in this <br /> well since October 18, 1999. This is continuing evidence of the effectiveness of the ongoing <br /> corrective action and postclosure maintenance. <br /> MW-4 <br /> The concentrations of all parameters were within the established concentration limits. Decreasing <br /> trends in both EC and TDS are seen this quarter. The decreasing trends in EC and TDS indicate that <br /> the total water quality for this well is improving. <br /> No VOCs were reported in MW-4. VOCs were last reported in this well when sampled in <br /> October 1999. <br /> Surface Water <br /> Summary <br /> Surface water samples were retrieved on December 27, 2006. All concentrations of monitoring and <br /> field parameters were below established concentration limits where the limits could be determined in <br /> the second quarter of 2007 (Table 2). <br /> GROUNDWATER DIRECTION AND FLOW RATE <br /> The prominent direction of groundwater flow that was determined from the elevations of water in <br /> the groundwater wells is from the Northeast to.Southwest(Figure 2). A secondary groundwater flow <br /> direction is to the south. This is consistent with the first quarter's projection, and is a shift of flow <br /> direction from the southern flow direction seen in the past. This shift in the flow direction is not the <br /> result of activity at the landfill. <br /> Harney Lane Sanitary Landfill Department of Public Works/Solid Waste <br /> 2nd Quarter 2007 Groundwater Monitoring Report County of San Joaquin—July 15,2007 <br /> 6 <br />