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t <br /> DISCUSSION <br /> TPHG and BTEX compounds were detected in the samples collected from monitonng wells MW-1 <br /> through MW-7, MW-113, MW-1C, and MW-8B MTBE was detected in the samples collected from <br /> monitoring wells MW-1, MW-3 and MW-4 The analytical results of groundwater samples are generally <br /> consistent with previous sampling events <br /> The groundwater flow direction was towards the east-northeast with an average groundwater gradient of <br /> 0 008 ft/ft The groundwater flow direction and gradient are consistent with previous quarters The <br /> groundwater elevations generally decreased by approximately 0 2 feet across the site <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitonng Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Groundwater Flow Direction and Gradient <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contours(Fourth Quarter 2000) <br /> • Figure 3 Groundwater Analytical Summary(Fourth 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 /> i <br /> C\MyDocuments\ARCO\21681QTRLY1200012168Q400 Delta <br /> 2/22/01 <br />