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Groundwater samples are analyzed every five(5) years for the following Constituents of Concern <br /> (CDCs). COCs were last monitored for groundwater in the fourth quarter of 2004, with the next <br /> groundwater COC monitoring scheduled for the first quarter of 2010: <br /> Total Organic Carbon <br /> Inorganics (dissolved) <br /> Volatile Organic Compounds (extended list) <br /> Semi-Volatile Organic Compounds <br /> Chlorophenoxy Herbicides <br /> Organophosphorus Compounds <br /> Surface Water <br /> When flowing, Corral Hollow Creek is sampled upstream of the waste management facility at <br /> background monitoring point SW-1 and downstream at monitoring point SW-2 (Figure 2). <br /> Samples are collected after the first storm of the rainy season that produces significant flow and <br /> semi-annually thereafter when water is flowing. <br /> Surface water samples are analyzed semi-annually for the following field and monitoring <br /> parameters in accordance with the WDRs: <br /> Temperature Carbonate <br /> Electrical Conductivity Bicarbonate <br /> pH Calcium <br /> Turbidity Magnesium <br /> Total Dissolved Solids Potassium <br /> Chloride Sodium <br /> Sulfate Volatile Organic Compounds <br /> Nitrate-nitrogen <br /> Surface water samples are analyzed every five(5) years for the following COCs: <br /> Total Organic Carbon <br /> Inorganics(dissolved) <br /> Volatile Organic Compounds(extended list) <br /> Semi-Volatile Organic Compounds <br /> Chlorophenoxy Herbicides <br /> Organophosphorus Compounds <br /> Surface water COC samples were last collected on January 5, 2005. The next COC surface water <br /> monitoring event is scheduled for the first quarter of 2010. <br /> Vadose Zone Soil Gas <br /> In accordance with the Waste Discharge Requirements and the Monitoring and Reporting program <br /> for the site, soil gas wells GW-1 through GW-7 are monitored for combustible gas quarterly, and <br /> sampled for VOCs (EPA Method TO-14) semiannually. <br /> Corral Hollow Landfill 5 Department of Public Works/Solid Waste <br /> 2nd quarter 2007 Groundwater Monitoring County of San Joaquin—July 31,2007 <br />