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r s. <br /> DISCUSSION <br /> At the time of the first quarter 2006 monitoring event, groundwater levels had increased between 0 95 and <br /> 197 feet in all wells since the previous sampling event (December 22, 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 east-southeast at an <br /> average gradient of 0 0030 fttft Northeast and southeast groundwater flow directions have been reported <br /> during previous monitoring events <br /> TPHG and MTBE were reported in well MW-1 MTBE was also reported in wells MW-3, MW-4, MW-5, <br /> MW-8, MW-9, and MW-10 The only concentration of TPHG (120 pg/L) was reported in well MW-1, and <br /> the highest concentration of MTBE (1,400 µg/L) was reported in well MW-8 TBA was reported in wells <br /> MW-3 (120 µg/L), MW-4 (230 µg/L), MW-8 (19,000 µg/L), MW-10 (26 µg/L), and VEW-3 (310,000 pg/L) <br /> TPHD, BTEX, DIPE, ETBE, TAME, 1,2-DCA, methanol, or ethanol were not reported in any of the wells <br /> The laboratory reported that the pH levels in the samples collected from wells MW-1, MW-2, MW-3, <br /> MW-6, MW-8, MW-9, MW-10, and VEW-3 were above the EPA recommended limit of 2 As the reported <br /> results for these wells appear to be generally consistent with historical data, it appears that the elevated <br /> pH has not affected data quality Analytical results of TPHG, benzene, MTBE, and TBA for groundwater <br /> samples collected on March 23, 2006, are presented in Figure 3 <br /> ATTACHMENTS <br /> m Table 1 Groundwater Elevation and Analytical Summary <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Figure 1 Site Location Map <br /> o Figure 2 Groundwater Elevation Contour Map (First Quarter 2006) <br /> • Figure 3 Groundwater Analytical Summary (first Quarter 2006) <br /> o 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 Gasoline\0835\Quarterly\2006\USA_835_1Q06 DOC 57'RAru5 <br />