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DISCUSSION <br /> TPHG, BTEX and MTBE were reported below laboratory detection limits for samples collected from <br /> monitoring wells MW-3, MW-4, and MW-7 TPHG was detected in the sample collected from MW-6 at a <br /> concentration of 73 gg/L MTBE was detected in the samples collected from MW-1 (0 54 Ag/L), MW-2 <br /> (1 2 µg/L), and at MW-5 (25µg/L) <br /> The groundwater flow direction was calculated toward the east-southeast at an average gradient of 0 0010 <br /> ft/ft Groundwater elevations in the monitoring wells decreased by more than 3 feet since the previous <br /> sampling event (September 2001) <br /> Delta is currently infecting ambient air at low flow rates through sparge wells AS-1, AS-2, and AS-3 Three <br /> site visits were conducted during the fourth quarter, 2001, to monitor and optimize the performance of the <br /> air bubbling system A Delta technician recorded down-well DO data and air bubbling flow rates during <br /> the site visits Table 3 presents dissolved oxygen concentrations in select wells <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Dissolved Oxygen Concentrations <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contours (Fourth Quarter 2001) <br /> • Figure 3 Groundwater Analytical Summary(Fourth 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 /> i <br /> i <br /> P 1A RCOQ 1301QTRLY120011Arco_2130_4Q01 doe Delta <br />