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' TPHg, BTEX, MTBE, TBA, TAME, ETBE, DIPE, 1,2-DCA, and EDB were not detected in any of the remaining influent, vessel 1, and effluent water samples collected from the treatment and discharge component of the vapor extraction system A summary of analytical results is presented in Table 5 Groundwater laboratory data sheets and chain- of-custody hain- ofcustody documentation are contained in Attachment 2 ' Aar Sparge System Monitoring The air sparge system was restarted on April 7, 2005 after a small air leak was repaired on the 2-inch PVC ' pipe and operated continuously until June 16, 2005 The air sparge compressor was shut off by ATC on June 16, 2005 since the SVE system was not operating The air sparge system was restarted by ATC on June 28,2005 when the SVE system was restarted ' REMEDIATION SYSTEM EVALUATION Soil Vapor Extraction System Evaluation The system was started up on April 7, 2005 and ran for approximately 18 hours before being monitored on ' April 8, 2005 From April 7 to June 29, 2005, the vapor extraction system was operational for approximately 6393 hours The SVE system operated for approximately 23 days at 62 cfm in April, approximately 12 days at 61 cfm m May, and for approximately 1 day at 31 cfm in June The average ' extracted vapor flow rate was approximately 60 8 cfm and the average influent vacuum achieved by the thermal oxidizer was approximately 20 inches of mercury, based on the information contained on the field monitoring data sheets contained in Attachment 3 Based on the measured influent flow rate of 60 8 cfm, average influent concentration of each analyte in ppmv, and using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of analyte and the molecular weight of each analyte in grams per mole, ATC calculated the total number of pounds of each ' analyte removed by the SVE system during the second quarter 2005 Calculations associated with the removal of the target analytes TPHg Benzene, toluene, ethylbenzene, xylenes, and MTBE are provided on Table 6 ' Total TPHg removed via vapor extraction since system startup on December 19, 2002 ' 8,648 lbs of TPHg as of end of first quarter 2005 + 22 37 pounds of TPHg second quarter 2005 = 8,666 88 pounds of TPHg removed since the startup of the system ' Total benzene removed via vapor extraction since system startup on December 19,2002 20 75 lbs benzene removed total as of end of first quarter 2005 +0 10 lb benzene second quarter 2005 ' = 20 85 pounds of benzene removed since the startup of the system Additionally, the SVE system removed approximately 0 21 pounds of toluene, 0 40 pounds of ethylbenzene, ' 0 83 pounds of total xylenes, and 0 03 pounds of MTBE during the second quarter 2005 These values were calculated for the current quarter, but a cumulative total since remediation began at the site has not historically been calculated 1 ' s s\cnviro1625961quart1yl2gr-2005 doc 7 ATC ASSOCIATES INC 1