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TABLE 4 <br /> Unsaturated Zone Soil Pore Gas T014 Monitoring Results <br /> Second Semester 2007 <br /> Foothill Sanitary Landfill <br /> SG Soil Gas Methane Carbon Oxygen Number of Highest VOC of Highest <br /> Well Probe Content Dioxide (°/®) Compounds Concentration Concentration <br /> N M Found PPB <br /> V/V <br /> 01 Single 0.4 0.1 18.5 2 54,000 Toluene <br /> 02 Single 0.0 0.0 20.2 4 31 Freon 12 <br /> Dichlorodifluoromethane <br /> 03 Single 0.0 4.3 14.3 6 320 Freon 12 <br /> Dichlorodifluoromethane <br /> 04 Single 0.0 4.6 11.1 7 81 Freon 12 <br /> Dichlorodifluoromethane <br /> 05 Single 0.0 2.1 12.4 3 10 2-Butanone (Methyl Ethyl <br /> Ketone <br /> 06 Single 0.0 1.9 12.2 6 1900 Freon 12 <br /> Dichlorodifluoromethane <br /> 07 Single 0.0 0.3 20.0 5 34 Ethanol <br /> 08 Single 0.0 0.3 19.3 4 490 Freon 12 <br /> Dichlorodifluoromethane <br /> 09 Single 0.0 0.2 20.3 5 7 Ethanol <br /> 10 Single 0.0 3.4 11.5 6 120 Freon 12 <br /> Dichlorodifluoromethane <br /> 11 Single 3.9 15.2 0.3 14 780 Freon 12 <br /> Dichlorodifluoromethane <br /> T#1 Soil Gas NS NS NS 17 2800 Freon 12 <br /> Trench#1 Dichlorodifluoromethane <br /> TO-14 Sampling Date: August 20, 2007 by SCS Engineers <br /> Monitoring Probe Sampling Date for Methane, Carbon Dioxide, and Oxygen: August 20, 2007. <br /> Note: Sampling protocol provides for sampling from the one probe at each well that most likely to have the <br /> hi hest VOC concentration. See Appendix J for major gasses composition at all soil gas probes <br /> NS = Not sampled <br /> ND = Not detected <br /> Foothill Sanitary Landfill 17 Department of Public Works/Solid Waste <br /> 2'd Semester and Annual 2007 Groundwater Monitoring County of San Joaquin-January 31,2008 <br />