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The LFG system was installed in the autumn of 2006, and has been in full operation since May <br /> Y p Y <br /> 2007. <br /> Groundwater continues to be un-impacted by the landfill. <br /> Due to falling groundwater elevations, reliable samples could no longer be collected from wells <br /> G-2 and G-5. These wells were replaced with wells G-2A and G-5A in 2013. Analyses of <br /> samples taken from the replacement wells are consistent with the most recent analyses from <br /> the wells they replaced. <br /> MONITORING PROGRAM <br /> Groundwater <br /> The groundwater well network consists of up-gradient well G-1 and down-gradient wells G2-A <br /> G-3D, G-4, G5A and G-6 (Figure 3). <br /> Groundwater samples are analyzed semiannually for the following field parameters: <br /> Elevation (Quarterly) pH <br /> Temperature Turbidity <br /> Dissolved Oxygen (DO) Redox Potential <br /> Electrical Conductivity (EC) <br /> Groundwater samples are analyzed semiannually for the following monitoring parameters: <br /> VOC Total Alkalinity <br /> Chloride Total Hardness <br /> Total Dissolved Solids (TDS) Chemical Oxygen Demand (COD) <br /> Groundwater samples are analyzed annually for the following monitoring parameters: <br /> Bicarbonate Chloride <br /> Nitrate-Nitrogen Sulfate <br /> Calcium Magnesium <br /> Potassium Sodium <br /> Groundwater samples are analyzed every 5 years for the following additional constituents of <br /> concern (COC): <br /> Semi-volatile Organic Compounds Dissolved Metals <br /> Organophosporus Pesticides Chlorinated Herbicides <br /> Organochlorine Pesticides Polychlorinated Biphenols (PCB) <br /> 5-year CDCs were last monitored during the first semiannual period of 2009. The next 5-year <br /> COC monitoring event will occur in the second semiannual period of 2014. <br /> North County RC&SL Public Works/Solid Waste <br /> 15`Semiannual 2014 Groundwater Monitoring 3 County of San Joaquin—July 31,2014 <br />