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TABLE 4 <br /> FIRST QUARTER UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> Highest <br /> Concentration <br /> Methane Number of Found VOC of Highest <br /> Soil Gas Well Content % Compounds PPB v/v Concentration <br /> SG-1 0 7 1199 Toluene <br /> SG-2 0 4 36 Toluene <br /> SG-3 0 10 454 Dichlorodifluoromethane <br /> SG-4 0 9 277 Dichlorodifluoromethane <br /> SG-5 0 3 14 Toluene <br /> SG-6 0 7 266 Dichlorodifluoromethane <br /> SG-7 0 7 48 Toluene <br /> SG-8 0 6 80 Toluene <br /> SG-9 0 4 84 Toluene <br /> SG-10 0 9 660 Dichlorodifluoromethane <br /> SG-11 1 0 9 557 Toluene <br /> SG-T 0 29 73 Benzene <br /> Sampling Date: 2-11-2004 for soil gas wells <br /> Sampling Date: 2-19-2004 for soil gas trench, SG-T <br /> Foothill Sanitary Landfill Department of Public Works/Solid Waste <br /> 1ST Semester 2004 Groundwater Monitoring County of San Joaquin-July 27,2004 <br />