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MONITORING PROGRAM <br /> Water quality is monitored in accordance with WDR Order No. R5-2003-0020. <br /> Groundwater <br /> The groundwater well network now consists of upgradient well MW-1 and downgradient wells <br /> MW-2R and MW-3 (Figure 3). All monitoring wells are equipped with dedicated purge and <br /> sampling pumps. Groundwater well MW-2R replaced well MW-2, which was abandoned in June <br /> 2003 because its location was in the expansion footprint of Module 1. <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 <br /> (VOCs) <br /> Groundwater samples are analyzed every 5 years for the following Constituents of Concern <br /> (COCs): <br /> • Total Organic Carbon <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> • Semivolatile Organic Compounds <br /> • Chlorophenexy Herbicides <br /> • Organophosphorous Compounds <br /> A COC groundwater monitoring event occurred in the third quarter of 2004. The next COC <br /> groundwater monitoring event will occur during the first quarter of 2010. <br /> Surface Water <br /> Surface water samples are collected after the first storm of the rainy season that produces <br /> significant flow and semiannually thereafter, when water is flowing. Surface water samples are <br /> collected from monitoring points S-I (upstream) and S-2 (downstream) of the landfill (Figure 3). <br /> Foothill Sanitary landfill q Department of Public Works/Solid Waste <br /> 2 Semester Groundwater Monitoring County of San Joaquin—January 31,2007 <br />