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3 SOIL VAPOR EXTRACTION SYSTEM MONITORING <br /> On behalf of PSC, Meinfelder performed weekly air monitoring on the SVE system <br /> during this past quarter This report summarizes the data generated during this <br />' period The data are presented in the following sections Summary tables for <br /> Contammant Removal Results and Air Emission Results are included in Tables 5 and <br /> 6 The most current field data sheet is included in Appendix C The most current <br />' laboratory analytical report is included in Appendix D <br /> 3.1 Air Monitoring Procedures <br /> During system operation, airflow rates are measured weekly in sparging well <br />' SP-1 and in venting wells VW-1 and MW-2 Flow rates are adjusted as <br /> necessary Volatile organic compound (VOC) vapors are measured from the <br /> sample ports of the influent stream, the first carbon vessel effluent stream, and <br />' the second carbon vessel effluent stream with a Photo-ionization Detector <br /> (PID) Air vapors are then collected from the same ports in Tedlar bags for <br /> laboratory analysis The samples were analyzed by GD Air Testing for BTEX <br />' and TPH-G by EPA Method TO-14 <br /> 3.2 BTEX and TPH-G Analytical Results <br /> Benzene, toluene, ethylbenzene, xylenes, and TPH-G were detected in the <br /> influent air sample for each event The concentrations decreased significantly <br /> downstream of the carbon filters or were not detected in the final effluent <br /> sample "GAC-2" Sample GAC-2 was not analyzed for two of the events this <br /> past quarter For sampling events performed on January 12'b and 19th of 2005, <br /> the Tedlar bag samples deflated or popped during shipping <br /> i3.3 Contaminant Removal and Air Emission Results <br />' The current total mass of TPH-G removed from the soil is approximately 173 <br /> pounds, which is approximately 51% of the initial estimated amount released <br /> The current mean influent TPH-G rate was 5 04 lbs/day, while the average <br />' emission rate after treatment was 0 17 lbs/day Therefore, the VOC removal <br /> efficiency was approximately 96 6% <br />' 3.4 Operation and Maintenance <br /> There were no operational or maintenance issues during this period <br /> However, after collecting the air samples, the system was turned off to collect <br /> the groundwater samples, and upon collecting the groundwater samples on <br /> 8 <br /> Quarterly Groundwater Monitoring Report <br /> March 2005 <br /> Prepared for SARA LEE BAKERY GROUP}INC Prepared by Philip Services Corporation <br /> Investigative and Quarterly Report list Quarterly Report 03_2005(final) September 23,2005 <br />