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Surface water samples are analyzed for the following monitoring and field parameters <br /> semiannually: <br /> • Temperature • Chloride <br /> • Electrical Conductivity 0 Sulfate <br /> • pH Nitrate-Nitrogen <br /> • Turbidity • Calcium <br /> ' Total Dissolved Solids 0 Magnesium <br /> • Carbonate Alkalinity • Sodium <br /> • Bicarbonate Alkalinity • Potassium <br /> ' Volatile Organic Compounds (VOCs) <br /> Surface water samples are also analyzed for the following COCs every 5 years: <br /> • Total Organic Carbon <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> • Semi-Volatile Organic Compounds <br /> • Chlorophenoxy Herbicides <br /> • Organophosphorous Compounds <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 in <br /> 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 /> however,water will be sampled if available in early 2004. <br /> ' Statistical Analysis <br /> 1 The FSL has been approved to use interwell tolerance limits methods(up-gradient well provides <br /> the background data). Analytical results from this monitoring period were compared to the <br /> concentration limits shown in Table 1. As requested by RWQCB staff, stiff diagrams are included <br /> f (Appendix F). <br /> Foothill Sanitary Landfill5 Department of Public Works/Solid Waste <br /> 2ND Semester/Annual 2003 Groundwater Monitoring County of San Joaquin-Revised June 29,2004 <br />