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Surface water samples are also analyzed for the following (COCs) every 5 years. <br /> TOC VOCs (Extended List) <br /> Oil and Grease Semi-VOCs <br /> Chemical Oxygen Demand Chlorophenoxy Herbicides <br /> Dissolved Oxygen Organophosphorus Compounds <br /> Inorganics (Dissolved) <br /> ,! Unsaturated Zone <br /> The unsaturated zone monitoring network consists of one background monitoring station, VZ-1 <br /> and seven point of compliance monitoring stations, VZ-2 through VZ-8 (Figure 3). These <br /> stations monitor for a potential leachate leak through the landfill liner of Modules 1, 3 and 4. <br /> Samples collected from the unsaturated zone are analyzed for the following semiannual field and <br /> monitoring parameters: <br /> Electrical Conductivity Sulfate <br /> pH Calcium <br /> TDS Magnesium <br /> Chloride Potassium <br /> Carbonate Sodium <br /> Bicarbonate VOCs (Short List) <br /> Nitrate-Nitrogen <br /> Unsaturated zone samples are also analyzed for the following COCs every five years: <br /> Total Organic Carbon Semi-VOCs <br /> Inorganics (Dissolved) Chlorophenoxy Herbicides <br /> VOCs (Extended List) Organophosphorus Compounds <br /> Vadose Zone Soil Gas <br /> In accordance with the Amended Report of Waste Discharge(May 27, 2005) and the Monitoring <br /> and Reporting program, soil gas wells SG-1 through SG-8 will be monitored for combustible gas <br /> quarterly and sampled semiannually for VOCs (EPA Method TO-14A). <br /> Soil gas samples are collected from all probes at soil gas wells SG-1 through SG-8 and from the <br /> soil gas trench under Module 4. Before sampling, the methane content was measured using a <br /> CES-LANDTEC GEMTm500 portable gas detector. The GEMTm500 was operated until a <br /> North County RCSL 5 Public Works/Solid Waste <br /> 1 st Semester 2006 Groundwater Monitoring County of San Joaquin—July 31,2006 <br />