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Groundwater Gradient: 0.002 ft/ft <br /> SVE SYSTEM QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory: 100 cfm Stealth Catalytic Oxidizer <br /> Operating Mode: Shutdown pending SJVUAPCD application review <br /> APCD Permit No.: N-903-2-0 <br /> TPH Concentration End of Period(lab): --- <br /> Benzene Concentration End of Period(lab): --- <br /> MTBE Concentration End of Period(lab): --- <br /> Flow Rate End of Period: --- <br /> HC Destroyed this Period(lab): --- <br /> Cumulative HC Destroyed: 3467.25 lbs. <br /> Cumulative flow: --- <br /> Percent Time Operational: --- <br /> DISCUSSION: <br /> At the time of the fourth quarter monitoring event, groundwater was encountered in the monitoring wells at <br /> depths ranging from approximately 44.00 to 46.59 feet below ground surface (bgs). Well S-2 was dry. <br /> . Groundwater elevations in the monitoring wells decreased 1.23 to 1.98 feet since the third quarter 2002 <br /> sampling event. The general groundwater flow direction on November 8, 2002 was calculated to be <br /> towards the south-southeast at an average gradient of 0.002 ft/ft, although radial groundwater flow was <br /> observed onsite in the vicinity of well S-2. South-southeast groundwater flow direction has consistently <br /> been observed during previous monitoring events. <br /> TPHG was detected in well MW-3 and S-2; MTBE was detected in wells MW-1, MW-3, and S-2. The <br /> highest concentration of TPHG (580 pg/L) was detected in well S-2, and the highest MTBE concentration <br /> (15 µg/L) was detected in well MW-3. Benzene was not detected in any of the wells during the fourth <br /> quarter 2002. TBA was detected in wells MW-2 (6.5 ttg/L) and MW-3 (14 pg/L). TPHG, benzene, or fuel <br /> oxygenate compounds were not detected in wells MW-4 or MW-6 through MW-10. <br /> ATTACHMENTS: <br /> • Table 1 Groundwater Elevation and Analytical Summary <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contour Map (Fourth Quarter 2002) <br /> Figure 3 Groundwater Analytical Summary(Fourth Quarter 2002) <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation <br /> P:1USA Gasolinel00651Qtrly120021USA_65_4Q02.DOC 5TRATU5 <br />