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TABLE 4 <br /> Unsaturated Zone Soil Pore Gas TO-14 Monitoring Results <br /> Second Quarter 2012 <br /> Corral Hollow Landfill <br /> Soil Gas Methane Carbon Highest <br /> Oxygen Number of VOC of Highest <br /> Well Probe Content Dioxide Concentration <br /> GW- N (%) (%) Compounds Found PPB(v/v) Concentration <br /> 1 Shallow 0 0.2 19.9 NS NS NS <br /> Middle 0 1.2 19.4 NS NS NS <br /> Deep 0 0.1 20.0 9 900 Freon 11 <br /> 2 Shallow 0 0.6 19.6 NS NS NS <br /> Middle 0 0.1 19.9 NS NS NS <br /> Deep 0 2.2 19.1 10 740 Freon 11 <br /> 3 Shallow 0 0.5 19.7 NS NS NS <br /> Middle 0 1.6 19.4 NS NS NS <br /> Deep 0 1.4 19.5 1 8 63 Tetrachloroethene <br /> 4 Shallow 0 0.2 19.1 NS NS NS <br /> Middle 0 0.3 14.6 4 600 Freon 12 <br /> Deep 0 0.1 19.4 NS NS NS <br /> 5 Shallow 0 1.6 18.3 NS NS NS <br /> Middle 0 1.5 18.7 NS NS NS <br /> Deep 0 2.2 11.3 5 620 Freon 11 <br /> 6 Shallow 0 3.0 16.5 NS NS NS <br /> Middle 1.5 8.7 5.2 NS NS NS <br /> Deep 0.7 3.0 16.2 8 5100 Freon 12 <br /> 7 Shallow 0 1.3 18.9 NS NS NS <br /> Middle 0 11.3 2.3 4 7.9 Acetone <br /> E = Exceeds instrument calibration range. (None found this sampling period.) <br /> TO-14 Sampling Date: April 5, 2012 by SCS Engineers <br /> Note: Sampling locations were established in 2006, with VOC samples taken from one probe at each well <br /> location, most likely to have the highest VOC concentration. This probe continues to be sampled thereafter. <br /> See Appendix J for gas composition at all soil gas probes <br /> NS = Not sampled, not selected for TO-14 monitoring <br /> NR = Not Reported <br /> Corral Hollow Sanitary Landfill 24 Department of Public Works/Solid Waste <br /> 2nd Quarter 2012 Groundwater Monitoring County of San Joaquin-July 30,2012 <br />