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' GeoHydrologic Consultants, Inc <br /> The high vacuum response in the extraction well, the positive pressure measured in the <br /> ' observation wells, and the low inlet vapor concentrations from the extraction well <br /> throughout the test is believed to be the result of the extraction well being screened below <br /> the water table, making this well marginal for use as a MPE well <br /> ' The data from the combined vapor/groundwater extraction pilot tests are tabulated in <br /> Table 4 and Table 5, and the field data sheets are included to Appendix D Laboratory <br /> ' analytical results of the air samples collected during the combined test are summarized in <br /> Table 6 The analytical results for the groundwater samples collected at beginning and at <br /> the end of the multi-phase extraction test from EW-5D are summarized in Table 7 <br /> Laboratory reports and chain-of-custody documentation are included in Appendix E <br /> 5.2 Multi-Phase Extraction Pilot Test (EW-5S) <br /> ' On March 24 2005, an eight-hour multi-phase extraction pilot test was conducted by <br /> ' extracting vapor and pumping groundwater from well EW-5S <br /> • The vacuum applied by the vapor extraction process ranged from 9 2 to 24 5 <br /> inches of Hg <br /> • The flow rate varied between 15 and 134 scfm <br /> lie • The PID readings for the total undiluted influent varied from 100 to 550 ppmV <br /> • The maximum vacuum in observation well MW-5 (13 feet away)was 2 50 inches <br /> of water <br />' • The maximum vacuum in observation well TB-9 (21 feet away) was 2 60 inches <br /> of water <br />' • The maximum vacuum in observation well TB-11 (12 feet away) was 0 20 inches <br /> of water <br />' • The maximum vacuum in observation well TB-10 (26 feet away) was 0 72 inches <br /> of water <br />' • The maximum vacuum in observation well MW-4 (60 feet away) was 0 10 inches <br /> of water <br />' • The maximum vacuum in observation well TB-7 (36 feet away) was 0 65 inches <br /> of water <br />' Groundwater was extracted using a two-inch diameter variable speed stainless-steel <br /> Grunfos electric submersible pump The pump intake was placed approximately two feet <br /> from the bottom of the well during the test, which correlates to approximately eight feet <br /> below static water levels Static water levels were measured at a depth of 50 00 feet deep <br /> 'roc 171 Pilot stogy Page 12 <br />