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Mr John Benedict Project No 880-039 lA <br /> . October 18,2002 <br /> Page 5 <br /> Benzene Destruction Efficiency(%) 100 <br /> Benzene emission rate to atmosphere(pounds per day) <0 0008 <br /> Average flow rate for this reporting period(scfm) 38 <br /> System uptime during this reporting period(days/%) 82 days/73% <br />' CONCLUSIONS <br /> Analytical results of groundwater samples collected from the site were generally consistent <br /> with previous sampling events Groundwater elevation decreased between 1 16 to 148 feet <br /> from the previous sampling event (May 31, 2002) The observed groundwater gradient <br /> during the third quarter 2002 was 0 02 with flow to the northwest 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 <br /> on-site wells are presented in Appendix E <br /> Approximately 132 pounds of TPH-g and 0 2 pounds of benzene were removed during the <br /> ' third quarter 2002 The system performed in compliance with permit requirements Pulsed <br /> operation of the soil vapor extraction system began in the second quarter 2002 and will <br /> continue through the fourth quarter 2002 <br /> Shaw E & I will continue to perform quarterly groundwater sampling The next <br /> Isampling event is tentatively scheduled for November 2002 <br /> Please call David Herzog at (916) 565-4377, if you have questions regarding this report <br />' or any aspect of the project <br /> Sincerely, <br /> SHAW ENVIRONMENTAL & 0. URE, INC <br /> ��ur <br /> Q` p <br /> v � <br /> I David W Herzog, R N0.7211 <br /> Project Geologist �* <br /> N1sacDP120021PRJ\PJ81880\8800391A 2ag doc Shaw Environmental and Infrastructure,Inc <br /> (01050000) <br />