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. REMEDIATION SYSTEM EVALUATION
<br /> Soil Vapor Extraction System Evaluation
<br /> From June 29 to October 7, 2005, the vapor extraction system was operational for approximately 1435 6
<br /> ' hours The SVE system operated for approximately 10 days at 33 cfm from June 29 to July 26,
<br /> approximately 23 days at 29 cfm rom July 26 to August 31, and for approximately 27 days at 77 45 cfm
<br /> from August 31 to October 7 The average extracted vapor flow rate was approximately 52 3 cfm and the
<br /> ' average influent vacuum achieved by the thermal oxidizer was approximately 18 inches of mercury, based
<br /> on the information contained on the field monitoring data sheets contained in Attachment 3
<br /> ' Based on the measured influent flow rate of 52 3 cfm, average influent concentration of each analyte in
<br /> ppmv, and using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of analyte and the
<br /> molecular weight of each analyte in grams per mole, ATC calculated the total number of pounds of each
<br /> ' analyte removed by the SVE system during the third quarter 2005 Calculations associated with the
<br /> removal of the target analytes TPHg Benzene, toluene, ethylbenzene, xylenes, and MTBE are provided
<br /> on Table 6
<br /> ' Total TPHg removed via vapor extraction since system startup on December 19,2002
<br /> 8,666 88 lbs of TPHg as of end of second quarter 2005 + 56 41 pounds of TPHg third quarter 2005 =
<br /> 8,723 29 pounds of TPHg removed since the startup of the system
<br /> Total benzene removed via vapor extraction since system startup on December 19, 2002
<br /> 20 85 lbs benzene removed total as of end of second quarter 2005 +0 41 lb benzene third quarter 2005
<br /> a
<br /> =21 26 pounds of benzene removed since the startup of the system
<br /> 1 Additionally, the SVE system removed approximately 0 67 pounds of toluene, 0 81 pounds of ethylbenzene,
<br /> 9 37 pounds of total xylenes, and 0 05 pounds of MTBE during the third quarter 2005 These values were
<br /> ' calculated for the current quarter, but a cumulative total since remediation began at the site has not
<br /> historically been calculated
<br /> ' Destruction Efficiency
<br /> The destruction efficiencies for TPHg, benzene, toluene, ethylbenzene, and xylenes using laboratory data
<br /> ' from July 26, 2005 were calculated to be approximately 97 73 percent, 80 00 percent, 82 14 percent, 88 89
<br /> percent,and 97 02 percent,respectively
<br /> ' The destruction efficiencies for TPHg, benzene, toluene, ethylbenzene, and xylenes using laboratory data
<br /> from August 31, 2005 were calculated to be approximately 99 55 percent, 93 33 percent, 94 25 percent,
<br /> 96 43 percent,and 99 44 percent,respectively
<br /> ' The destruction efficiencies for TPHg, benzene, and toluene using laboratory data from June 29, 2005, were
<br /> calculated to be approximately approximately 69 23 percent, 86 84 percent, and 57 14 percent,respectively
<br /> The destruction efficiencies for ethylbenzene and total xylenes were not calculated because effluent
<br /> ' concentrations were greater than the influent concentrations
<br /> s\env tro%25961quart1y\3gr-2005 doe 7 ATC ASSOCIATES INC
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