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TABLE 6 <br /> UNSATURATED ZONE AIR <br /> FIRST QUARTER RESULTS <br /> NORTH COUNTY SANITARY LANDFILL <br /> Highest <br /> Concentration <br /> Soil Gas Well, Methane Number of Found VOC of Highest <br /> SG Probe Content % Compounds PPB v/v Concentration <br /> 1 shallow 0 9 8.6 Toluene <br /> intermediate 0 5 6.0 Toluene <br /> deep 0 4 3.2 Toluene <br /> 2 1 shallow 0 9 149 Dichlorodifluoromethane <br /> intermediate 0 8 54 Dichlorodifluoromethane <br /> deep 0 5 8.7 Toluene <br /> 3 shallow 0 2 4.9 Toluene <br /> intermediate 0 1 3.7 Toluene <br /> dee2 0 4 4.0 Toluene <br /> 4 single 0 15 13.9 1,4-Dichlorobenzene <br /> 5 single 0 15 37 Dichlorodifluoromethane <br /> t' 6 single 59.7 18 3116 Dichlorodifluoromethane <br /> 7 single 0 4 13 Dichlorodifluoromethane <br /> &Toluene <br /> 8 shallow 0 5 9.2 Toluene <br /> intermediate 0 3 3.8 Toluene <br /> deep 0 6 5.5 Toluene <br /> T soil gas trench 0 27 82 Benzene <br /> Sampling Date:2-11 &2-12-2004 for wells,2-19-2004 for soil gas trench <br /> North County RCSL Public Works/Solid Waste <br /> 1ST Semester 2004 Groundwater Monitoring County of San Joaquin-July 30,2004 <br />