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F. Geological Teclurcicsl� Dual Phase Extraction Pilot Test Report Page 11 Project No.723.2 4 November 5,2004 Extraction Date Time Benzene Toluene Eth I X lene TPH-G Well u u Benzene u u L u Samples obtained from EW-1 usin dis osable bailer �,. EW-1 07/27/04 1 9:18 1 25600 41800 4060 19500 270000 EW-1 07/28/04 1 0:55 1 30900 44900 3320 16000 217000 Avg TPH-G 243500 Sam fes obtained from Dual Phase holding tank disc harae Dort EW-1 1 07/28/04 16:30 781 J 2160 386 2350 19300 EW-1 07/28/04 23:30 7852120 345 2310 19200 EW-1 &VEW-1 07/30/04 17:30 973 2170 312 2060 17500 Avg TPH-G 18667 w .GTI calculated the mass balance for TPH-G removed during the test using the above average TPH-G value for EW-1 samples and the pumping data in Table 4. The results are tabulated in Table 7: Mass Removed by Groundwater Extraction. The treatment of 17,392 gallons of water from the extraction wells during the one week test resulted in the removal of approximately 16.06 kg or 5.71 gallons of TPH-G. V�1 The July 27 - 30, 2004, groundwater laboratory analytical data were submitted electronically to GeoTracker as required under AB2886 on October 15 & 20, 2004, (Confirmation Ws 1817480444 and 4257712364). 6.0 CONCLUSIONS & RECOMMENDATIONS Based on our interpretation of the data collected over the course of this subsurface investigation, GTI have reached several conclusions. These conclusions are based on the premise that the data we considered, although incomplete, are representative of actual site conditions. We acknowledge that there may be undiscovered conditions, which would upon ` their consideration, change our interpretation and thus our conclusions. Our recommendations are based on our knowledge of site conditions, and on the state and limitations of subsurface investigative technology. 4„ The following conclusions are made: 1. Soil vapor extraction is a viable technology for reducing contaminant concentrations in the subsurface at the site. The pilot test demonstrated that up to 0.1 inche of water vacuum could be achieved at a distance of 46 feet from the extraction point (from EW-1 to MW-5).