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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 /> 0 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 <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> • Semi-Volatile Organic Compounds <br /> • Chlorophenoxy Herbicides <br /> • Organophosphorous Compounds <br /> Surface water samples were last analyzed for COCs during the fourth quarter 2004 monitoring event. The <br /> next monitoring event for surface water COCs will occur during the first quarter of 2010. <br /> Leachate <br /> Leachate samples are collected monthly from the sump under module 1. Field parameters measured monthly <br /> include: <br /> • Total flow • Flow rate <br /> • pH • Electrical Conductivity <br /> LLeachate 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 /> Foothill Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> 1s`Semester 2008 Groundwater Monitoring County of San Joaquin—July 31,2008 <br />