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DISCUSSION <br /> Concentrations of TPHG and benzene were detected in the sample collected from monitoring well MW-1 <br /> at 84 6 µg/l- and 3 41 µglL, respectively MTBE was detected in the samples collected from monitoring <br /> wells MW-1 (145 µg/L) and MW-2 (31 6 Rg/L) using USEPA Method 8260A ETBE, DIPS, TAME, TBA, <br /> and 1,2-DCA were not detected In any of the samples, consistent with the previous sampling event <br /> The groundwater gradient was calculated to be towards the northwest at a gradient of 0 0005 ft/ft The <br /> groundwater elevations increased approximately 1 foot in the monitoring wells since the previous sampling <br /> event (December 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 Data (First Quarter 2001) <br /> • Figure 3 Groundwater Analytical Summary(First 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 /> C 1ARCO%60801Quarterly1200116080Q101 doc Delta <br /> 5/4/01 <br />