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Mr Tom Busenbark Project No 880-039 IA <br /> January 29, 2003 <br /> Page 5 <br /> Fourth Quarter 2002 System Performance Summary <br /> 1 Pounds TPH-g removed since startup 3,165 <br /> Pounds TPH-g removed during this reporting period 102 <br /> TPH-g daily removal rate during reporting period(pounds per day) 17 <br /> TPH-g destruction efficiency(%) 93 3 to 99 7 <br /> TPH-g emission rate to atmosphere(pounds per day) <1 65 <br /> Pounds benzene removed since startup 45 <br /> Pounds benzene removed during this reporting period <01 <br /> Benzene Destruction Efficiency(%) 100 <br /> Benzene emission rate to atmosphere(pounds per day) <0 0009 <br /> Average flow rate for this reporting period(scfm) 39 <br /> System uptime during this reporting period(days/%) 60 days/66% <br /> CONCLUSIONS <br /> Analytical results of groundwater samples collected from the site were generally consistent <br /> with previous sampling events Groundwater elevation decreased between 0 65 to 106 feet <br /> from the previous sampling event (August 23, 2002) The observed groundwater gradient <br /> during the fourth quarter 2002 was 0 006, with flow to the east Petroleum hydrocarbon <br /> concentrations have generally increased since the first quarter 2002 Graphs showing <br /> TPH-g, benzene, MTBE concentrations, and groundwater elevations versus time in wells <br /> MW-1R, VW-2, and VW-3 are presented in Appendix E <br /> Approximately 102 pounds of TPH-g and less than 0 1 pounds of benzene were removed <br /> during the fourth quarter 2002 The system performed in compliance with permit <br /> requirements Pulsed operation of the SVE system began in the second quarter 2002, and <br /> continued during the fourth quarter 2002 <br /> ' Shaw will continue to perform quarterly groundwater sampling The next sampling <br /> event is tentatively scheduled for February 2003 <br /> N\sacDP120031Prj\88018800391A 3aa doc Shaw Environmental, Inc <br /> (01050000) <br />