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• DISCUSSION <br /> MTBE was detected in the samples collected from monitoring wells MW-1 (29 µg/L) and MW-2 (56 µg/L) <br /> TPHG, BTEX, ETBE, DIPS, TAME, TBA, and 1,2-DCA were reported below laboratory detection limits for <br /> all of the samples, consistent with the previous sampling event <br /> The groundwater gradient was calculated to be towards the east at an average gradient of 0 0006 ft/ft <br /> The groundwater elevations decreased approximately one foot in the monitoring wells since the previous <br /> sampling event (June 2001) <br /> ATTACHMENTS <br /> • Tble 1 Grou a e Monitoring Data <br /> • Tab 2 Gro ndwater Analytical Results for Oxygenates and Additional Compounds <br /> • Figure Si Location Map <br /> • Figure 2 roundwater Elevation Contour Map (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 /> P 1ARC0160801Quarterly120011Arco_6080 3Q01 doc Delta <br />