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CAMBRIA <br /> detected in the sample at an elevated reporting limit of 50 ppb Vapor samples were collected at <br /> the wellhead for laboratory analysis The vapor sample collected at 13 30 contained 5,000 parts <br /> per mullion by volume (ppmv) TPHg, 41 ppmv benzene, and was below the reporting limit <br /> (<l 4 ppmv) for MTBE The vapor sample collected at the end of the day (15 30) contained <br /> 6,000 ppmv TPHg, 69 ppmv benzene, and <1 4 ppmv MTBE The Solleco unit was set to operate <br /> overrught to maximize the remedial effort <br /> June 22, 2004 DPE from well VEW-2 continued through the day An average wellhead vacuum <br /> of 16 9 inches WC was established by a liquid-ring-pump-generated vacuum of approximately <br /> 272 inches WC The maximum wellhead vacuum achieved was 18 2 inches WC The vapor <br /> extraction flow rate ranged from 32 8 to 64 1 sctm and averaged 45 9 scfm A vapor sample <br /> collected at 8 00 contained 5,900 ppmv TPHg, 85 ppmv benzene, and <2 8 ppmv MTBE The <br /> vapor sample collected at the end of the day (13 00) contained 4,800 ppmv TPHg, 81 ppmv <br /> benzene, and <2 8 ppmv MTBE Cambria personnel observed a maximum vacuum influence of <br /> 1 1 and 0 02 inches WC in observation wells VEW-1 and MW-5, respectively The groundwater <br /> extraction rate ranged from 0 2 gpm to 2 6 gpm The Solleco unit was set to operate overnight to <br /> maximize the remedial effort <br /> June 23, 2004 DPE from well VEW-2 continued through the day An average wellhead vacuum <br /> of 15 9 inches WC was established by a liquid-ring pump generated vacuum of 272 inches WC <br /> The maximum wellhead vacuum achieved was 16 2 inches WC The vapor extraction flow rate <br /> ranged from 14 4 to 29 8 scfm and averaged 24 sctm A vapor sample collected at 8 00 contained <br /> 3,800 ppmv TPHg, 84 ppmv benzene, and <1 4 ppmv MTBE The vapor sample collected at the <br /> end of the day (14 30) contained 3,800 ppmv TPHg, 75 ppmv benzene, and <1 4 ppmv MTBE <br /> Cambria personnel observed a maximum vacuum influence of 0 6 and 0 1 inches WC in <br /> observation wells VEW-1 and MW-5, respectively The groundwater extraction rate ranged from <br /> 0 5 gpm to 3 9 gpm The Solleco unit was allowed to run overnight to maximize the remedial <br /> ettort <br /> June 24, 2004 DPE from well VEW-2 continued until 8 30 An average wellhead vacuum of <br /> 15 6 niches WC was established by a liquid-ring pump generated vacuum of 272 inches WC The <br /> vapor extraction flow rate was 19 2 scfm Vacuum influence was not measured in the observation <br /> wells VEW-1 and MW-5 The vapor sample collected at the conclusion of the interim remediation <br /> from well VEW-2 contained 3,800 ppmv TPHg, 77 ppmv benzene, and <2 8 ppmv MTBE <br /> The total volume of groundwater extracted from well VEW-2 over the three days (68 8 hours) of <br /> DPE was estimated to be 3,486 gallons A groundwater sample from extraction well VEW-2 was <br /> 0854 7 <br />