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Unsaturated Zone (Lysimeters) <br /> The unsaturated zone monitoring network consists of one background monitoring station,VZ-1 and <br /> seven points of compliance monitoring stations, VZ-2 through VZ-8 (Figure 3). These stations monitor <br /> for a potential leachate leak through the landfill liner of Areas 1, 3 and 4. <br /> Unsaturated zone samples are analyzed for the following parameters semiannually. <br /> Temperature Total Alkalinity <br /> Electrical Conductivity(EC) Total Hardness <br /> pH Chemical Oxygen Demand(COD) <br /> Turbidity Volatile Organic Compounds (Short List) <br /> Dissolved Oxygen(DO) Chloride <br /> Redox Potential Total Dissolved Solids (TDS) <br /> Unsaturated zone samples are also analyzed for the following COCs every five years: <br /> VOCs (Extended List) Semi-VOCs <br /> Inorganics (Dissolved) Chlorinated Herbicides <br /> Polychlorinated Biphenols Organophosphorus Pesticides <br /> (PCBs) <br /> Organochlorine Pesticides <br /> Soil Gas <br /> In accordance with the Report of Waste Discharge (January 29, 2010) and the Monitoring and Reporting <br /> program, soil gas wells SG-1 through SG-8 will be monitored quarterly for combustible gas and wells <br /> SG-1, SG-3, and SG-6 will sampled semiannually for VOCs (EPA Method TO-14A). VOCs will also <br /> be monitored in any perimeter migration monitoring well in which the methane concentration exceeds <br /> 5%by volume. <br /> Soil gas samples are collected from all probes at soil gas wells SG-1 through SG-8 and from the soil gas <br /> trench under Area 4. Before sampling, the methane content was measured using a CES-LANDTEC <br /> GEMTm500 portable gas detector. The GEMTm500 was operated until a steady-state gas composition <br /> indicated that the well was purged. After purging, gas samples were collected in Summa canisters for <br /> analysis. <br /> Leachate <br /> Leachate at each sump is monitored monthly for the following field parameters: <br /> Volume,pump flow rate,pH, electrical conductivity <br /> North County RC&SL Public Works/Solid Waste <br /> 2"d Semester and Annual 2012 Groundwater Monitoring 5 County of San Joaquin—January 15,2013 <br />