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r <br /> Groundwater Flow Direction: South <br /> Groundwater Gradient: 0.002 ft/ft <br /> SVE SYSTEM QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory: _ 2.3 HP Fuji Blower, two 1,000 Ib carbon vessels <br /> Operating Mode: Shut down pending installation of carbon system <br /> APCD Permit No.: N-4887-1-0 (ATC) <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 /> Percent Time Operational: 0 <br /> DISCUSSION: <br /> At the time of the second quarter monitoring event, groundwater was encountered in the monitoring wells <br /> at depths ranging from approximately 41.63 to 43.67 feet below ground surface (bgs). Groundwater <br /> elevations in the monitoring wells increased 0.27 to 1.01 feet since the first quarter 2003 sampling event. <br /> Depth to water measurements were normalized to mean sea level (MSL), and were used to construct a <br /> groundwater elevation contour map (Figure 2). The general groundwater flow direction on April 10, <br /> 2003, was calculated to be towards the south at an average gradient of 0.002 ft/ft. South-southeast <br /> groundwater flow direction has consistently been observed during previous monitoring events. <br /> TPHG was detected in well MW-4 (120 µg/L). Benzene was detected in wells MW-8 and S-1 with the <br /> highest concentration (0.96 �ig/L) found in well S-1. MTBE was detected in wells MW-3, MW-4, and S-1, <br /> with the highest concentration (4.7 µg/L) detected in well MW-3. No other fuel oxygenate compounds <br /> were detected in any of the wells. Analytical results from the April 10, 2003, sampling event are <br /> generally consistent with historical analytical data. TPHG, benzene, and MTBE data have been <br /> summarized on Figure 3. <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 (Second Quarter 2003) <br /> • Figure 3 Groundwater Analytical Summary (Second Quarter 2003) <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 /> L <br /> P:IUSA Gasoline10065\"rly120031USA_65_2Q03.DOC 5T"Wo <br />