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REMEDIATION SYSTEM EVALUATION
<br /> ' Soil vapor Extraction System Evaluation
<br /> From October 7 to December 27, 2005, the vapor extraction system was operational for approximately
<br /> ' 865 6 hours The SVE system operated for approximately 17 5 days at 34 cfm from October 7 to October
<br /> 28, approximately 18 days at 41 cfm from October 28 to November 21, and for approximately 1 day at 41
<br /> cfm from November 21 to December 27 The average extracted vapor flow rate was approximately 38 7 cfm
<br /> and the average influent vacuum achieved by the thermal oxidizer was approximately 21 inches of mercury,
<br /> based on the information contained on the field monitoring data sheets contained in Attachment 3
<br /> Based on the measured influent flow rate of 38 7 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 fourth 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 /> 8,723 29 lbs of TPHg as of end of third quarter 2005 + 13 02 pounds of TPHg fourth quarter 2005 =
<br /> ' 8,736 31 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 /> 2126 lbs benzene removed total as of end of third quarter 2005+0 13 Ib benzene fourth quarter 2005
<br /> q
<br /> =21 39 pounds of benzene removed since the startup of the system
<br /> 1 Additionally, the SVE system removed approximately 0 16 pounds of toluene, 0 07 pounds of ethylbenzene,
<br /> 0 42 pounds of total xylenes, and 0 02 pounds of MTBE during the fourth quarter 2005 These values were
<br /> ' calculated for the current reporting period, however, a cumulative total since remediation began at the site
<br /> has not historically been calculated
<br /> Destruction Efficiency
<br /> The destruction efficiencies for TPHg, benzene, toluene, ethylbenzene, and xylenes using laboratory data
<br /> ' from October 28, 2005, were calculated to be approximately 94 44 percent, 30 56 percent, 48 45 percent,
<br /> 19 35 percent,and 76 74 percent,respectively
<br /> ' The destruction efficiencies for TPHg, benzene, toluene, ethylbenzene, and xylenes using laboratory data
<br /> from November 21, 2005, were calculated to be approximately 88 00 percent, 91 67 percent, 77 97 percent,
<br /> 73 68 percent, and 39 09 percent,respectively
<br /> ' The destruction efficiencies for October 28 and November 21, 2005, were also calculated using PID
<br /> readings which resulted in values of 85 76 percent and 94 78 percent, respectively Destruction efficiency
<br /> calculations are provided in Table 7
<br /> 1
<br /> Since the destruction efficiency calculations for most of the analytes using laboratory data were below 99%,
<br /> ATC also calculated the total mass of TPHg and BTEX during the reporting period to show compliance
<br /> with the site San Joaquin Valley Air Pollution Control District(APCD)permit The total mass released was
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