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TABLE 7 <br /> UNSATURATED ZONE AIR <br /> SECOND QUARTER RESULTS <br /> NORTH COUNTY SANITARY LANDFILL <br /> Highest <br /> Concentration VOC of Highest <br /> Soil Gas Well, Methane Number of Found Concentration <br /> SG Probe Content % Compounds PPB v/v <br /> 1 shallow 0 3 30 Toluene <br /> intermediate 0 3 29 Toluene <br /> deep 0 3 22 Toluene <br /> 2 shallow 0.4 10 76 Meth ene Chloride <br /> intermediate 0 4 36 Dichlorodifluoromethane <br /> deep 0 5 34 Dichlorodifluoromethane <br /> 3 shallow 0 3 19 Toluene <br /> intermediate 0 4 15 Toluene <br /> deep 0 3 10 Toluene <br /> 4 single 0 2 14 Toluene <br /> 5 sin le 4.2 9 158 Dichlorodifluoromethane <br /> 6 sin le 44.2 14 1765 Dichlorodifluoromethane <br /> 7 single 0 11 19 Dichlorodifluoromethane <br /> 8 shallow 0 8 162 Vinyl Chloride <br /> intermediate 0 7 7.2 1,4-Dichlorobenzene <br /> deep 0 8 7.7 Toluene <br /> T soil gas trench 0 7 10 Toluene <br /> Sampling Date: 5-7-2004 <br /> North County RCSL Public Works/Solid Waste <br /> 1 sr Semester 2004 Groundwater Monitoring County of San Joaquin-July 30,2004 <br />