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Surface Water <br /> Surface water samples are collected after the first storm of the rainy season that produces significant flow <br /> and semiannually thereafter,when water is flowing. Surface water samples are collected from monitoring <br /> 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 semiannually: <br /> • Temperature • Chloride <br /> • Electrical Conductivity • Sulfate <br /> • pH • Nitrate-Nitrogen <br /> • Turbidity • Calcium <br /> • Total Dissolved Solids • Magnesium <br /> • Carbonate Alkalinity • Sodium <br /> • Bicarbonate Alkalinity • Potassium <br /> • VOCs <br /> Surface water samples are also analyzed for the following COCs every 5 years: <br /> • Total Organic Carbon • Semi-Volatile Organic Compounds <br /> • Inorganics (dissolved) • Chlorophenoxy Herbicides <br /> • VOCs (extended list) • Organophosphorous Compounds <br /> Surface water samples were analyzed for COCs during the first quarter 2009 monitoring event and last <br /> collected during the first quarter 2011. <br /> Leachate <br /> Leachate samples are collected monthly from the sump under module 1. Field parameters measured monthly <br /> include: <br /> • Total flow <br /> • pH <br /> • Flow rate <br /> • Electrical Conductivity <br /> 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 /> Foothill Sanitary Landfill 9 Department of Public Works/Solid Waste <br /> 1s'Semester 2012 Groundwater Monitoring County of San Joaquin—July 17,2012 <br />