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Mr ]ohn Benedict Project 880039 1A February 22, 2002 Page 4 maintained above 98 percent The burn chamber temperature ranged from 747'F to 778°F, well above the minimum required burn temperature of 600°F System performance data, field data sheets, and calculations are presented in Appendix D Fourth Quarter 2001 System Performance Summary Pounds TPH-g removed since startup 2,901 Pounds TPH-g removed during this reporting period 505 TPH-g daily removal rate during reporting period (pounds per day) 8 ITPH-g destruction efficiency (%) 99 1 to 99 8 TPH-g emission rate to atmosphere (pounds per day) c0 04 to 0 06 Pounds benzene removed since startup 43 Pounds benzene removed during this reporting period 15 Benzene Destruction Efficiency (%) 98 to 100 Benzene emission rate to atmosphere (pounds per day) <0 0002 to c0 0003 Average flow rate for this reporting period (acfm) 52 System uptime during this reporting period (days/%) 59 day or 66% j CONCLUSIONS Analytical results of collected groundwater samples from MWAR were generally consistent with previous sampling events Groundwater elevation decreased in MWAR 0 57 feet from the previous sampling event (September 2001) The observed groundwater gradient in August 2001 was 0 002 ft/ft to the southwest Approximately 505 pounds of TPH-g and 15 pounds of benzene were removed during the Fourth quarter 2001 The system performed in compliance with permit requirements Soil vapor extraction will continue for First quarter 2002 IT will continue to perform quarterly groundwater sampling The next sampling event is tentatively scheduled for March 2002 IT CORPORATION SAC 111SACRYPIICOMMON1sacDP120021PRAP]8188018800391 A 2aa doe-Mit 1 (01010000)