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d <br /> t <br /> d <br /> t <br /> • DISCUSSION <br /> In the uppermost portion of the water-bearing zone, petroleum hydrocarbons were detected in wells MW-1 <br /> through MW-7 The highest TPHG concentration (28,000 µg/L) was detected in well MW-6, and the <br /> highest benzene concentration (10,000 pg/L) was detected in well MW-3 TPHG (77 and 94 µg/L, <br /> respectively) and benzene (30 and 40 µg/L, respectively) were detected in both mid-depth wells MW-1B <br /> and MW-8B Benzene (9 3 and 47 µg/L, respectively), was detected in the deepest screened wells <br /> MW-1C and MW-8C Oxygenate compounds were not detected in any of the wells except 1,2 DCA which <br /> was detected in wells MW-1C (1 8 pg/L), MW-8 (3 6 µg/L) and MW-8B (2 8 �ig/L) These results appear <br /> generally consistent with historical data <br /> The groundwater flow direction was calculated to be towards the southeast at an average groundwater <br /> gradient of 0 0026 ft/ft The groundwater elevations decreased between 0 87 and 1 11 feet in all wells <br /> except MW-8, where groundwater rose 1 83 feet <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Historical Groundwater Flow Direction and Gradient <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contour Map (Fourth Quarter 2001) <br /> • Figure 3 Groundwater Analytical Summary Map (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 1ARCO121681QTRLY1200]\Arco_2168_4Q01 doc Delta <br />