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® TABLE 4 <br /> Unsaturated Zone Soil Pore Gas TO-14 Monitoring Results <br /> First Quarter 2013 <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 (%) (%) (%) Compounds Found PPB(v/v) Concentration <br /> 1 Shallow 0 0.4 19.1 NS NS NS <br /> Middle 0 2.7 18.9 NS NS NS <br /> Deep 0 5.5 16.9 9 1000 Freon 12 <br /> 2 Shallow 0 0.7 18.6 NS NS NS <br /> Middle 0 3.9 17.6 NS NS NS <br /> Deep 0 4.2 18.5 10 610 Freon 11 <br /> 3 Shallow 0 0.2 20.3 NS NS NS <br /> Middle 0 1.5 20.1 NS NS NS <br /> Deep 0 0.9 20.2 9 73 Trichloroethene <br /> 4 Shallow 0 0.1 20.1 NS NS NS <br /> Middle 0 0.2 18.3 9 300 Freon 11 <br /> Deep 0 79.6 20.4 NS NS NS <br /> 5 Shallow 0 0.6 20.3 NS NS NS <br /> Middle 0 0.7 19.9 NS NS NS <br /> Deep 0 17 1.9 5 1400 Freon 11 <br /> 6 Shallow 0 1.6 19 NS NS NS <br /> Middle 0 1.7 19 NS NS NS <br /> Deep 0 2 18.6 1 5 12000 Freon 12 <br /> 7 Shallow 0 1.3 18.8 4 3.3 M,p-Xylene <br /> Middle 0 9.1 9.6 NS NS NS <br /> E= Exceeds instrument calibration range. (None found this sampling period.) <br /> TO-15 Sampling Date: January 30, 2013 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 <br /> thereafter. <br /> See Appendix J for gas composition at all soil gas probes <br /> NS = Not sampled, not selected for TO-15 monitoring <br /> NR= Not Reported <br /> Corral Hollow Sanitary Landfill 23 Department of Public Works/Solid Waste <br /> 1s'Quarter 2013 Groundwater Monitoring County of San Joaquin-April 15,2013 <br />