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Groundwater samples are analyzed every 5 years for the following Constituents of Concern <br /> (CDCs): <br /> • Total organic carbon 0 Cyanide <br /> • Carbonate 0Sulfide <br /> • Bicarbonate 0 Semivolatile Organic Compounds <br /> • Total alkalinity 0 Organochlorine Pesticides, PCBs <br /> • Metals 0 Chlorophenexy Herbicides <br /> Surface Water <br /> Surface water samples are collected after the first storm of the rainy season that produces <br /> significant flow and quarterly thereafter when water is present from monitoring point S-1 <br /> (upstream) and monitoring point Sf2 (downstream) of the landfill (see Figure 3). <br /> Surface water samples are analyzed for the following quarterly monitoring and field parameters: <br /> • Temperature 0 TDS <br /> • Electrical conductivity • Chloride <br /> • pH 0 Sulfate <br /> • Turbidity 0 Nitrate-nitrogen <br /> • Total suspended solids <br /> Surface water samples are also analyzed for the following COCs every 5 years: <br /> • Total organic carbon 0 Cyanide <br /> • Carbonate 0 Sulfide <br /> • Bicarbonate 0 Oil and Grease <br /> • Total alkalinity 0 Chemical oxygen demand <br /> ' 0 1 Metals 0 Dissolved oxygen <br /> Constituents of Concern <br /> Both groundwater and surface water samples are analyzed for constituents of concern(COCs) <br /> every five years (Appendix E). The last five year COC groundwater monitoring event occurred <br /> in the fourth quarter of 1999. The next monitoring event will occur during the fourth quarter of <br /> 2004. <br /> Surface water samples were last analyzed for COCs during the first quarter 2000 monitoring <br /> ' event. The next monitoring event for surface water will occur during the first quarter of 2005. <br /> ' Foothill Sanitary Landfill Department of Public Works/Solid Waste <br /> e Quarter and Annual 2002 Groundwater Monitoring Report 2 County of San Joaquin <br />