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i <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 /> i (COCs): <br /> • Total Organic Carbon <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> • Semivolatile Organic Compounds <br /> • Chlorophenexy Herbicides <br /> • Organophosphorous Compounds <br /> Groundwater was sampled for COCl in the third quarter of 2004 from the wells that were installed <br /> at that time. Wells MW-4 and MW-5 COCs were sampled for COCl after their installation, in the <br /> second semester 2007. Groundwater will be sampled next for COCs in the first quarter of 2010. <br /> Monitoring well elevations are taken quarterly. Hydrographs are included in the second semester <br /> and annual report in accordance with the current WDRs. These figures present the following <br /> elevations: <br /> r • Groundwater for each quarter <br /> • Top and bottom of well screen <br /> iPump intake <br /> i 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-1 (upstream) and S-2 (downstream) of the landfill (Figure 3). <br /> Surface water samples are analyzed for the following field and monitoring parameters <br /> semiannually: <br /> iFoothill Sanitary Landfill 5 Department of Public Works/Solid Waste <br /> V4 Semester 2009 Groundwater Monitoring County of San Joaquin—July 31,2009 <br />