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. DISCUSSION <br /> TPHG, BTEX and MTBE were reported below laboratory detection limits for samples collected from <br /> monitoring wells MW-1 through MW-4, MW-6 and MW-7 MTBE was detected in the sample collected <br /> from MW-5 at a concentration of 29 µg11- TPHG and BTEX were not detected in the sample collected <br /> from well MW-5 <br /> The groundwater flow direction was calculated toward the east-northeast at an average gradient of 0 0014 <br /> ft/ft An east-northeast groundwater flow direction is generally consistent with previous quarters <br /> Groundwater elevations in the monitoring wells decreased by more than 4 feet since the previous <br /> sampling event (June 2001) <br /> Delta conducted three site visits during the third quarter, 2001, to monitor and optimize the performance of <br /> the air bubbling system A Delta technician recorded down-well DO data and air bubbling flow rates <br /> during the site visits <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contours (Third Quarter 2001) <br /> • Figure 3 Groundwater Analytical Summary (Third Quarter 2001) <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> Appendix C Certified Analytical Reports and Chain-of-Custody Records <br /> P1ARC0121301QTRLY�2G0I\Arco_2130_3Q01 doe Delta <br /> 11/12/01 <br />