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1 <br /> Gtologleal7r kucslac. Page 13 <br /> Dual Phase Extraction Pilot Test Report <br /> Project No 662 2 <br /> February 22,2005 <br /> Soil samples were obtained from MW-5 & MW-6 at the 25 feet bgs depth (capillary fringe) <br /> ' and analyzed as detailed in section 2 3 above With the exception of 0 89 mg/kg ethanol in <br /> MW-5, neither sample contained any other constituents above the laboratory detection limits <br /> GTI has updated our Figure 3 Cross Section B — B' to include the well MW-5 and MW-6 <br /> locations See Figure 2 for cross section location <br /> ' 6.0 DISCUSSION <br /> ' The following sections will summarize the results of the pilot test efforts <br /> 6.1 Vapor Extraction <br /> ' The pressure necessary for demonstrating vacuum influence is generally regarded as at least <br /> 01 inches of water ("How to Evaluate Alternative Cleanup Technologies for Underground <br /> ' Storage Tank Sites", USEPA, May, 1995) The influence detected in monitoring wells MW- <br /> 1, MW-2 and MW-3 during extraction from EW-2 achieved an average minimum of 0 46 <br /> inches water vacuum (see Table 6) Well MW-2 is located approximately 58 feet from EW-2 <br /> and this distance is used as a conservative estimate as the radius of influence Figures 5 and 6 <br /> indicate the measured vacuum in the wells at 09 40 on Monday (December 60) and 08 00 on <br /> Tuesday (December 7h), respectively The radii of influence in these figures suggest that a <br /> ' soil vapor extraction system drawing from EW-2 would be sufficient to address the soil <br /> beneath a major portion of the site <br /> ' The laboratory analyses of the soil vapor samples obtained during the test are summarized in <br /> Table 3 in Appendix A, and in the following table <br /> ' Well Date Time Benzene Toluene Ethyl Xylene MTBE TPH-G <br /> Benzene <br /> KA I I <br /> ' EW-2 12/06/04 1600 019 0 99 027 082 14 26 <br /> 12/06/04 2359 014 074 043 14 27 34 <br /> ' 12/07/04 0800 0 088 040 018 055 16 20 <br /> EW-11 & <br /> EW-2 12/07/04 1600 010 091 018 070 00044 6 3 <br /> ' 12/07/04 2359 008 071 018 082 <0 0036 120 <br /> 12/08/04 800 0 097 074 013 058 00039 6 4 <br /> 12/08/04 1600 015 13 027 120 <0 0048 120 <br /> ' 12/08/04 2359 014 12 023 095 <0 0041 8 4 <br /> 1 12/09/04 0800 011 073 0.11 0 53 <0 0036 5 8 <br /> 1 <br /> a' <br />