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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"upgradient"is now known to be <br /> crossgradient from the landfill, and not upgradient of either the landfill or another monitoring <br /> well. <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 /> 2"d Semester and Annual 2009 Groundwater Monitoring County of San Joaquin—January 31,2010 <br />