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• DISCUSSION <br /> TPNG was detected in the sample collected from monitoring well MW-1 at a concentration of 387 pglL <br /> MTBE was detected in the samples collected from monitoring wells MW-1 and MW-2 at concentrations of <br /> 18 7 pg/L and 28 4 pg/L, respectively(USEPA Method 8260A) <br /> The groundwater gradient was calculated to be towards the northeast at a gradient of 0 0005 ft/ft The <br /> groundwater elevations decreased approximately 0 5 feet in the monitoring wells since the previous <br /> sampling event (September 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 (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 Cham-of-Custody Records <br /> C\ARC0\60801QTRLY1200016080Q300 Delta <br /> 2/1/01 <br />