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t Ms Lori Duncan <br />October 28, 2004 <br />Page 4 <br />Project No 880-039 IA01010000 <br />Benzene destruction efficiency was maintained at approximately 54 percent The burn <br />chamber temperature ranged from 751 IF to 756°F, well above the minimum required <br />burn temperature of 600°F (Table 3) System performance data, and calculations are <br />presented in Figures 2 and 3, and field data sheets are included in Appendix D SVE <br />well data are presented in Table 4 <br />Third Quarter 2004 System Performance Summary <br />Pounds TPHg removed since startup <br />3,244 <br />Pounds TPHg removed during this reporting period <br />6 <br />TPHg daily removal rate during reporting period (pounds per day) <br />0 065 <br />TPHg destruction efficiency (%) <br />38 <br />TPHg emission rate to atmosphere (pounds per day) <br />010 <br />Pounds benzene removed since startup <br />49 <br />Pounds benzene removed during this reporting period <br />01 <br />Benzene Destruction Efficiency (%) <br />54 <br />Benzene emission rate to atmosphere (pounds per day) <br />00003 <br />Average flow rate for this reporting period (scfm) <br />38 <br />System uptime during this reporting period (days/%) <br />92 days 193% <br />CONCLUSIONS <br />Analytical results of groundwater samples collected from the site were generally consistent <br />with previous sampling events Groundwater elevation decreased in all wells between <br />121 and 2 23 feet from the previous sampling event (May 10, 2004) The observed <br />groundwater gradient during the third quarter 2004 was 0 008 to the northeast beneath the <br />site Graphs showing TPHg and benzene concentrations, and groundwater elevations <br />versus time in wells MW -1 R, VW -2, and VW -3 are presented in Appendix E <br />Approximately six pounds of TPHg were removed during the third quarter 2004 The <br />system performed in compliance with permit requirements Pulsed operation of the SVE <br />system began in the second quarter 2002, but the SVE system was not pulsed during the <br />third quarter 2004 <br />". Shaw will continue to perform quarterly groundwater sampling The next sampling <br />event is tentatively scheduled for November 2004 <br />N 1sacDP120041Prj188M80039I A 4ad doc SHAW ,ENVIRONMENTAL, INC <br />