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MONITORING PROGRAM <br /> Water quality is monitored in accordance with WDR Order No. R5-2003-0020. <br /> Groundwater <br /> New wells MW-4 and MW-5 were installed during the fall of 2006. The groundwater well <br /> network now consists of upgradient well MW-4 and downgradient wells MW-2R, MW-3, and <br /> MW-5. MW-1,which had previously been considered the "upgradient" is now crossgradient <br /> from a portion of the landfill. However, MW-1 is not downgradient of any portion of the landfill. <br /> Therefore, it also provides information on background water quality conditions for the <br /> downgradient wells. <br /> All monitoring wells are equipped with dedicated purge and sampling pumps. <br /> Groundwater samples are analyzed semiannually for the following field and monitoring <br /> parameters as specified in the WDRs: <br /> • Temperature • Chloride <br /> • Electrical Conductivity • Sulfate <br /> • pH • Nitrate-Nitrogen <br /> • Turbidity • Calcium <br /> • Total Dissolved Solids • Magnesium <br /> • Potassium • Sodium <br /> • Carbonate Alkalinity • Bicarbonate Alkalinity <br /> • Volatile Organic Compounds (VOCs) <br /> Groundwater samples are analyzed every 5 years for the following Constituents of Concern <br /> (CDCs): <br /> • Total Organic Carbon <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> • Semivolatile Organic Compounds <br /> • Chlorophenexy Herbicides <br /> • Organophosphorous Compounds <br /> Groundwater samples were analyzed for COCs during the second semester 2009 monitoring event. <br /> The next monitoring event for Groundwater COCs will occur during the second semester of 2014. <br /> Foothill Sanitary Landfill 5 Department of Public Works/Solid Waste <br /> 1"Semester 2010 Groundwater Monitoring County of San Joaquin—July 21,2010 <br />