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EXPLORATION <br /> Temporary exploratory borings TB-1 and TB-2 were drilled using a Versa-Drill V-1000X <br /> drilling rig utilizing air rotary drilling methods. Cuttings were sampled every 5 feet to identify <br /> and log the soils encountered. Ted Sison, Staff Scientist with SCS Engineers,inspected and <br /> recorded all drilling activities and logged encountered soils(Appendix B). The work was done <br /> from June 12 to 20, 2003. <br /> ANALYSES <br /> Groundwater samples were sampled and analyzed for VOCs in accordance with the approved <br /> Sampling and Analysis Plan, and EPA Method 8260B. <br /> Soil gas samples were analyzed for VOCs using EPA Method TO-14A. <br /> RESULTS <br /> Groundwater: The groundwater samples from the temporary borings were found free of VOC <br /> Group gr p <br /> contamination(Appendix A). These results are consistent with data collected <br /> from -3 since January 2002. <br /> Soil Gas: Four VOC compounds were detected in the soil gas collected near MW-3. <br /> However,these compounds are not detected in the water samples taken at MW-3 <br /> or at the temporary borings of this Evaluation Monitoring. <br /> Additionally,the two VOCs (1, 1-Dichloroethene,and Trichloroethene)which <br /> initially indicated impact to the groundwater were not detected in either the soil <br /> gas or the landfill gas sample. <br /> Landfill Gas: Numerous VOCs were detected in landfill gas (Appendix A). <br /> CONCLUSION <br /> The results of the EMP indicate no impact by VOCs at this time. <br /> ' The presence of VOCs in soil gas apparently does not cause impact to groundwater, at least at <br /> the concentrations measured in the soil gas in these tests. <br /> Engineering Feasibility Report 3 Foothill Sanitary Landfill <br /> October 30,2003 San Joaquin County Solid Waste <br />