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DISCUSSION <br /> MTBE was detected in the samples collected from monitoring wells MW-1 (150 µglL), MW-2 (58 µg/L) and <br /> MW-3 (1 6 µglL) TPHG, BTEX, ETRE, DIPE, TAME, and TBA were reported below laboratory reporting <br /> limits for 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 0004 ft/ft <br /> The groundwater elevations have increased between 0 08 feet to 0 09 feet in the monitoring wells since <br /> the previous sampling event (September 2001) <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates and Additional Compounds <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contour Map (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 /> P 1ARC0160801Quarter1y1200I\Arco_6080_4Q01 doc Delta <br />