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Groundwater The groundwater well network now consists of upgradient well MW-1 and downgradient wells MW-2R and MW-3 (Figure 3). All monitoring wells are equipped with dedicated purge and sampling pumps. Groundwater well MW-2R replaced well MW-2, which was abandoned in June 2003 because its location was in the expansion footprint of Module 1. Groundwater samples are analyzed semiannually for the following field and monitoring parameters as specified in the WDRs: • Temperature • Chloride • Electrical Conductivity • Sulfate • pH • Nitrate-Nitrogen • Turbidity • Calcium • Total Dissolved Solids • Magnesium • Potassium • Sodium • Carbonate Alkalinity • Bicarbonate Alkalinity • Volatile Organic Compounds (VOCs) Groundwater samples are analyzed every 5 years for the following Constituents of Concern (CDCs): • Total Organic Carbon • Inorganics (dissolved) • VOCs (extended list) • Semivolatile Organic Compounds • Chlorophenexy Herbicides • Organophosphorous Compounds A COC groundwater monitoring event occurred in the third quarter of 2004. The next COC groundwater monitoring event will occur during the first quarter of 2010. Surface Water Surface water samples are collected after the first storm of the rainy season that produces significant flow and semiannually thereafter, when water is flowing. Surface water samples are collected from monitoring points S-1 (upstream) and S-2 (downstream) of the landfill (Figure 3). Surface water samples are analyzed for the following field and monitoring parameters semiannually: ® Temperature • Chloride • Electrical Conductivity • Sulfate • pH • Nitrate-Nitrogen • Turbidity • Calcium • Total Dissolved Solids • Magnesium • Carbonate Alkalinity • Sodium 1 • Bicarbonate Alkalinity • Potassium ® VOCs Foothill Sanitary Landfill 6 Department of Public Works/Solid Waste 1a`Semester Groundwater Monitoring County of San Joaquin—July 31,2007