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Ms Lori Duncan Project No 880-039 IA <br /> January 30, 2004 <br /> Page 4 <br /> (Table 3) System performance data, field data sheets, and calculations are presented in <br /> Appendix D Soil vapor extraction well data are presented in Table 4 <br /> Second Quarter 2003 System Performance Summary <br /> Pounds TPHg removed since startup 3,190 <br /> Pounds TPHg removed during this reporting period 5 <br /> TPHg daily removal rate during reporting period(pounds per day) 006 <br /> TPHg destruction efficiency(%) 97 <br /> TPHg emission rate to atmosphere(pounds per day) <010 <br /> Pounds benzene removed since startup 46 <br /> Pounds benzene removed during this reporting period 1 <br /> Benzene Destruction Efficiency(%) NA <br /> Benzene emission rate to atmosphere(pounds per day) 0 <br /> Average flow rate for this reporting period(scfm) 37 <br /> System uptime during this reporting period(days/1/1o) 80 days 188% <br /> CONCLUSIONS <br /> Analytical results of groundwater samples collected from the site were generally consistent with <br /> previous sampling events Groundwater elevation decreased in all wells between 0 37 and 0 89 feet <br /> from the previous sampling event (August 4, 2003) The observed groundwater gradient during the <br /> fourth quarter 2003 was 0 008, with flow to the northeast Graphs showing TPHg, benzene, <br /> MTBE concentrations, and groundwater elevations versus time in wells MW-1R, VW-2, and <br /> VW-3 are presented in Appendix E <br /> Approximately 5 pounds of TPHg were removed during the fourth quarter 2003 The system <br /> performed in compliance with permit requirements Pulsed operation of the SVE system began in <br /> the second quarter 2002, and continued during the fourth quarter 2003 <br /> Shaw will continue to perform quarterly groundwater sampling The next sampling event is <br /> tentatively scheduled for February 2003 <br /> N 4sacDP12004Fgt88018800391A 4aa doc Shaw Environmental,Inc <br />