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DISCUSSION: <br /> Concentrations of TPHG and BTEX compounds were detected onlyin monitoring well MW-4 g 4 which is <br /> consistent with the previous and initial sampling events. <br /> MTBE was detected in the samples collected from monitoring wells MW-3 through MW-6 at <br /> concentrations of 2.58 pg1L, 1,220 gg\L, 10,300 µglL, and 6,690 gglL, respectively. TBA (367 µg\L) was <br /> detected in the sample collected from monitoring well MW-5 and ETBE (5.00 �tg1L) was detected in the <br /> sample collected from monitoring well MW-6. <br /> The groundwater flow direction was calculated to be towards the southeast at an average gradient of <br /> 0.002 ft/ft. The groundwater elevation decreased approximately 1.5 feet in the monitoring wells since <br /> June 2000. <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 Contours (Third Quarter 2000) <br /> • Figure 3 Groundwater Analytical Summary(Third Quarter 2000) <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 /> PAVILIONWyDocumentslARCa154691QTRLY12000L5469Q300 Delta <br /> 11/30/00 <br /> i <br />_ l <br />