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1 1 <br /> DISCUSSION- <br /> At the time of the fourth quarter 2005 monitoring event, groundwater levels had increased between 0 21 <br /> and 0 41 feet in all wells since the previous sampling event (September 28, 2005) Depth-to-water <br /> measurements were corrected to mean sea level (MSL) and used to construct a groundwater elevation <br /> contour map (Figure 2) Groundwater flow beneath the site was generally to the northeast at an average <br /> gradient of 0 0020 ft/ft Northeast and southeast groundwater flow directions have been reported during <br /> previous monitoring events <br /> TPHG and MTBE were reported in wells MW-1 and MW-8 MTBE was also reported in wells MW-2 <br /> through MW-5, MW-9, MW-10, VEW-1, and VEW-3 The highest concentrations of TPHG (600 µglL) and <br /> MTBE (1,800 pglL) were reported in well MW-8 TBA was reported in wells MW-3 (360 pg/L), MW-4 (360 <br /> pgIL), MW-5 (13 µg/L), MW-8 (910 µg/L), MW-10 (160 pg/L), and VEW-3 (220,000 Vg/L) TAME (7 1 <br /> �tgIL) was reported in well MW-8 TPHD, BTEX, DIPE, ETRE, 1,2-DCA, methanol, or ethanol were not <br /> reported in any of the wells The laboratory reported that the pH levels in the samples collected from wells <br /> MW-1, MW-2, MW-6, MW-8, MW-9, and VEW-3 were above the EPA recommended limit of 2 Analytical <br /> results of TPHG, benzene, MTBE, and TBA for groundwater samples collected on December 22, 2005, <br /> are presented in Figure 3 <br /> ATTACHMENTS <br /> o Table 1 Groundwater Elevation and Analytical Summary <br /> o Table 2 Groundwater Analytical Results for Oxygenates <br /> o Figure 1 Site Location Map <br /> Figure 2 Groundwater Elevation Contour Map (Fourth Quarter 2005} <br /> o Figure 3 Groundwater Analytical Summary (Fourth Quarter 2005) <br /> Appendix A Field Data Sheets <br /> o Appendix B Sampling and Analysis Procedures <br /> o Appendix C Certified Analytical Reports and Cham-of-Custody Documentation <br /> K\USA Gasohne\0835\Quarlerly\2005\USA_835_4QO5 DOC STRATUS <br />