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C A M B R I A <br /> MTBE The Solleco unit operated overnight at the established vacuum setting to maximize the <br /> remedial effort <br /> October S, 2003. The extraction flow rate from SVE-1 ranged from 64 to 82 standard cubic feet <br /> per minute (scfm) and averaged 74 scfm over the course of the test, which ended at 14 30 on <br /> October 8 An approximate wellhead vacuum of 12 inches Hg was established with the liquid- <br /> ring pump set at a vacuum of approximately 20 inches Hg Cambria personnel observed a <br /> vacuum influence of 0 5 inches water column-gauge (WC) in SVE-2 No vacuum influence was <br /> measurable in SVE-3 <br /> A vapor sample collected at 10 15 contained <10 ppmv TPHg, <0 31 ppmv benzene, and <br /> 19 ppmv MTBE A vapor sample collected at 14 15 contained <10 ppmv TPHg, <0 31 ppmv <br /> benzene, and 23 ppmv MTBE <br /> A vapor extraction test on SVE-2 began at approximately 14 35 on October 8 A vapor sample <br /> collected from SVE-2 at 15 00 contained 15 ppmv TPHg, <0 31 ppmv benzene, and 0 98 ppmv <br /> MTBE The Solleco unit operated overnight at the vacuum setting established by the SVE-2 step <br /> • test to maximize the remedial effort <br /> October 9, 2003 The extraction flow rate from SVE-2 ranged from 61 to 79 scfm and averaged <br /> 67 scfm over the course of the test, which ended at 12 00 on October 9 An approximate <br /> wellhead vacuum of 1 0 inches Hg was established with the liquid-ring pump set at a vacuum of <br /> approximately 20 inches Hg Cambria personnel observed a vacuum influence of 0 6 inches WC <br /> in SVE-1 and 0 1 inches WC in SVE-3 <br /> A vapor sample collected at 8 30 contained 61 ppmv TPHg, <0 31 ppmv benzene, and 24 ppmv <br /> MTBE A vapor sample collected at 12 00 contained 47 ppmv TPHg, <0 31 ppmv benzene, and <br /> 26 ppmv MTBE <br /> A vapor extraction test on SVE-3 began at approximately 12 25 on October 9 A vapor sample <br /> collected from SVE-3 at 12 37 contained 14 ppmv TPHg, <0 31 ppmv benzene, and 0 28 ppmv <br /> MTBE The Solleco unit operated overnight at the vacuum setting established by the SVE-3 step <br /> test to maximize the remedial effort <br /> October 10, 2003 The SVE test on SVE-3 continued throughout the day on October 10 and <br /> through the night A vapor sample collected at 9 01 contained 42 ppmv TPHg, <0 31 ppmv <br /> 0955 8 <br />