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3 SOIL VAPOR EXTRACTION SYSTEM MONITORING <br /> On behalf of PSC, Kleinfelder 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 /> contaminant removal results and air emission results are included in Tables 5 and 6 <br /> 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 /> the analysis The samples were analyzed by GD Air Testing for BTEX and <br /> 1 TPH-G by EPA Method TO-14 <br /> 3.2 BTEX and TPH-G Analytical Results <br /> Benzene, toluene, ethylbenzene, xylenes, and/or 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 " There were no sample data to report for the weekly event <br /> on June 14, 2005, due to system malfunction There were no sample data to <br /> report for the weekly event on July 25, 2005, due to system damage <br /> 3.3 Contaminant Removal and Air Emission Results <br /> ' The current total mass of TPH-G removed from the soil is estimated at 178 <br /> pounds, which is approximately 52% of the initial estimated amount released <br /> The overall mean influent TPH-G rate was 4 04 lbs/day, while the average <br /> emission rate after treatment was 0 26 lbs/day Therefore, the TPH-G removal <br /> efficiency was approximately 93 6% <br /> 3.4 Operation and Maintenance <br /> The system was repaired and re-engaged on May 20, 2005 Weekly air <br /> samples were collected throughout this period The system was not operating <br /> upon the weekly site visit on June 14, 2005 The weekly air samples were not <br />' 9 <br /> Quarterly Groundwater Monitoring Report <br /> July 2005 <br />' Prepared for SARA LEE BAKERY GROUP,INC Prepared by Philip Services Corporation <br /> Investigative and Quarterly Report\.3rd Quarterly Report 07_2D05(final) September 23,2005 <br />