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It is unlikely that the increasing tend in turbidity is a result of landfill activities. Siltation within the <br /> well is often the cause of an increase in turbidity that does not affect the water quality of the <br /> aquifer outside of the well. As such, turbidity is an indicator of well function and not an indicator <br /> of landfill impact to groundwater. <br /> MW-3 (Directly Down-Gradient) <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 an increasing trend for the following parameters <br /> during the first semester 2012: <br /> • Turbidity <br /> • Bicarbonate Alkalinity <br /> Trace concentrations of one VOCs (Benzene) was confirmed in MW-3 during the first semester <br /> 2012 sampling event. The presence of this VOC will continue to be checked for at this well <br /> during the next semiannual event. <br /> i <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 an increasing trend for the following parameters <br /> during the first semester 2012: <br /> • Electrical Conductivity <br /> • pH <br /> • Turbidity <br /> • Total Dissolved Solids <br /> • Bicarbonate Alkalinity <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 /> No VOCs were detected in MW-4 during the first semester 2012 sampling event. <br /> MW-5 <br /> No general water quality parameter concentration limits where limits could be determined were <br /> exceeded in MW-5 during the first semester 2012 sampling event with the exception of Chloride. <br /> However, as presented below, it is likely the Chloride exceedence is due to be the treatment <br /> ponds of the migrant labor camp and not the landfill directly upgradient. <br /> One (Di chlorodifluoroemethane)was detected in MW-5 at levels above the PQL during the first <br /> semesterr 2012 sampling event. The presence of VOCs will continue to be checked for at this <br /> well during the next semiannual event. <br /> Harney Lane Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> I"Semester 2012 Groundwater Monitoring Report County of San Joaquin—July 31,2012 <br />