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IOC AMBRIA A vacuum of 60 mH2O was applied to well VE-2 for a period of 20 minutes The vacuum was then increased to 70 mH2O for another 20 minutes of extraction The vacuum was finally increased to 80 inH2O for another 20 minutes of extraction This short-term testing of well VE-2 yielded an optimal extraction rate of 36 5 cfm at a vacuum of 80 mH2O Cambria observed a maximum induced vacuum of 17 inH2O at well VE-1, located 14 feet from well VE-2 Cambria observed a maximum induced vacuum of 0 65 mH2O at well MW-5, located 10 3 feet from well VE-2 Although the optimal extraction rate for both wells was obtained at the highest vacuum, the difference between the extraction rates (3 5 to 6 cfm) obtained at the varied vacuums was minimal Based on this minimal difference in extraction rates and in order to maintain long-term operation of the PD blower within its temperature limits, Cambria set the PD blower to operate at 60 mH2O for the long-term test At 60 mH2O, (coupled) wells VE-1 and VE-2 yielded an average extraction rate of 46 2 cfm during the first day of the long-term test TPHg and MTBE vapor concentrations were reported as 520 and 280 parts per million by volume(ppmv),respectively, in the vapor sample collected at 2 45 pm Benzene was not detected in this sample Cambria observed a maximum induced vacuum of 0 3 mH2O at well MW-5 November 27, 2001 TPHg and MTBE vapor concentrations were reported as 250 and 120 ppmv, respectively, in the vapor sample collected at 12 00 pin Benzene was not detected in this sample The extraction rate averaged 45 7 cfm at 59 inH2O Cambria observed a maximum induced vacuum of 10 mH2O at well MW-5 November 28, 2001 TPHg and MTBE vapor concentrations were reported as 200 and 42 ppmv, respectively, in the vapor sample collected at 2 15 pm Benzene was not detected in this sample The extraction rate averaged 44 9 cfm at 60 inH2O Cambria observed a maximum induced vacuum of 0 9 mH2O at well MW-5 November 29, 2001: TPHg and MTBE vapor concentrations were reported as 100 and 20 ppmv, respectively, in the vapor sample collected at 8 30 am Benzene was not detected in this sample The extraction rate averaged 49 3 cfm at 60 mH2O Cambria observed a maximum induced vacuum of 1 1 mH2O at well MW-5 November 30, 2001 TPHg and MTBE vapor concentrations were reported as 210 and 20 ppmv, respectively, in the vapor sample collected at 3 00 pm Benzene was detected at 0 057 ppmv The extraction rate averaged 44 6 cfm at 60 mH2O Cambria observed a maximum induced vacuum of 0 8 inH2O at well MW-5 1346 6