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TABLE 4 <br /> Unsaturated Zone Soil Pore Gas TO-14 Monitoring Results <br /> ® Third 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 (%) (%) (%) Compounds Found PPB(v/v) Concentration <br /> 1 Shallow 0 1.2 19.9 NS NS NS <br /> Middle 0 2.3 18.3 NS NS NS <br /> Deep 0 2.6 17.9 12 420 Freon 12 <br /> 2 Shallow 0 0.9 19.5 NS NS NS <br /> Middle 0 02 20.4 NS NS NS <br /> Deep 0 2 18.8 15 520 Freon 11 <br /> 3 Shallow 0 0.6 20.3 NS NS NS <br /> Middle 0 0.3 20.5 1 NS NS NS <br /> Deep 0 0.2 20.5 21 43 Freon 11 <br /> 4 Shallow 0 0.2 20.4 NS NS NS <br /> Middle 0 0.2 17.8 NS NS NS <br /> Deep 0 0.1 20.6 12 45 Freon 12 <br /> 5 Shallow 0 0.3 20 NS NS NS <br /> Middle 0 0.5 20.5 17 170 M,p-Xylene <br /> ANIL Deep 00.4 20.2 NS NS NS <br /> 6 Shallow 0 0.7 19.8 NS NS NS <br /> Middle 0 0.7 19.6 NS NS NS <br /> Deep 0 6.7 5.8 6 18000 Freon 12 <br /> 7 Shallow 0 14.4 3.1 NS NS NS <br /> Middle 1 0 1 1.8 18.8 20 170 Acetone <br /> E= Exceeds instrument calibration range. (None found this sampling period.) <br /> TO-15 Sampling Date: August 6, 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-15 monitoring <br /> NR= Not Reported <br /> Corral Hollow Sanitary Landfill 25 Department of Public Works/Solid Waste <br /> 4"'Quarter and Annual 2012 Groundwater Monitoring County of San Joaquin-January 15,2013 <br />