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TABLE <br /> UNSATURATED ZONE SOIL PORE GAS TO-15 MONITORING RESULTS <br /> Second Quarter 2012 <br /> HARNEY LANE SANITARY LANDFILL <br /> Soil Gas Methane Carbon Highest <br /> Well Probe Content Dioxide Oxygen Number of Concentration VOC of Highest <br /> GW (%) (%) (%) Compounds Found PPB Concentration <br /> v/v <br /> 9 Middle 0 1.9 18.2 3 23 Tetrahydrofuran <br /> 10 Deep 0 1.2 18.7 8 410 Freon 12 <br /> East Header 27.7 24.4 0.4 25 2000 Ethyl Benzene <br /> West Header 18.7 21.7 2.4 31 5700 Toluene <br /> E = Exceeds instrument calibration range. (None found this sampling period.) <br /> TO-15 Sampling Date: April 12, 2012 by SCS Engineers <br /> Monitoring Probe Sampling Date for Methane, Carbon Dioxide, and Oxygen: April 24, 2012 by LFG System <br /> Header Data: April 17, 2012. <br /> Note: Sampling protocol for the 2006 VOC samples required sampling from one probe at each well location, most <br /> 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 /> Harney Lane Sanitary Landfill Department of Public Works/Solid Waste <br /> 1"Semester 2012 Groundwater Monitoring Report County of San Joaquin—July 31,2012 <br />