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Leachate samples are analyzed annually for the following parameters as specified in the WDRs: <br /> • Chloride • Nitrate-Nitrogen <br /> • Total Dissolved Solids (TDS) • Sulfate <br /> • Calcium • Potassium <br /> • Magnesium • Sodium <br /> • Carbonate Alkalinity • Bicarbonate Alkalinity <br /> • VOCs • <br /> Leachate samples are 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 /> Leachate samples were analyzed for COCs during the second semester 2009 monitoring event. The next <br /> monitoring event for leachate COCs will occur during the second semester of 2014. <br /> Vadose Zone Soil Gas <br /> The soil is monitored for VOCs per the WDRs Order No. R5-2003-0020. Eleven wells, SG-1 through <br /> SG-11, are located around modules"P'and 1 (Figure 5). Wells extend to depths varying from 25 feet to <br /> 68 feet below the surface. Gas from the soil gas trench under Module 1, designated SG-T, is also analyzed <br /> for VOCs. <br /> The Monitoring and Reporting Program requires that soil gas be monitored semi-annually. Samples are <br /> analyzed by a certified laboratory per EPA test method TO-14A. <br /> MONITORING RESULTS <br /> Sampling and analysis procedures are in Appendix A and the field data sheets are in Appendix B. The <br /> laboratory reports are in Appendix C. Although well MW-1 had sufficient water to measure the water level, <br /> there was insufficient water to collect a sample. <br /> Statistical Analysis <br /> The FSL has been approved to use interwell tolerance limits methods, with an upgradient well providing <br /> background data(Tables 2 &3). <br /> MW-4 was located directly up-gradient of the landfill based on groundwater elevations from the previously- <br /> installed wells. This well has been sampled eleven times since installation. Concentration limits have been <br /> established based on Sanitas software calculations using data for MW-4. <br /> Foothill Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2011 Groundwater Monitoring County of San Joaquin—January 31,2012 <br />