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• DISCUSSION: <br /> TPHG and benzene were detected in the sample collected from monitoring well MW-4 and MW-10. <br /> Benzene was detected in the samples collected from MW-2, MW-5, and MW-8. MTBE was detected in <br /> the samples collected from wells MW-4, MW-5, MW-6, MW-8, and MW-10. DIPE (3.0 gg/L) and 1,2-DCA <br /> (13 pg/L) were detected in the sample collected from well MW-9. Petroleum hydrocarbons were not <br /> detected in samples collected from monitoring wells MW-1, MW-3, and MW-7. Concentrations of <br /> petroleum hydrocarbons and fuel oxygenates are generally consistent with previous quarters. <br /> The groundwater flow direction on September 14, 2001 was calculated to be towards the northeast at an <br /> average gradient of 0.0026 ft/ft. Northeast, east, and southeast groundwater flow directions have been <br /> reported for previous sampling events. <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 (3rd Quarter 2001) <br /> • Figure 3 Groundwater Analytical Summary (3r'j 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:IA RC0154691Quarterly1200]1Arco_5469_3 Q0].doc Delta <br />