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19 <br /> Y <br /> DISCUSSION <br /> to At the time of the third quarter 2003 monitoring event, groundwater elevations had decreased between <br /> 0 43 feet and 1 44 feet in the monitoring wells since the May 21, 2003, monitoring event Depth-to-water <br /> measurements were corrected to mean sea level (MSL) and used to construct a groundwater elevation <br /> contour map (Figure 2) The measurement for well MWO-3 appeared anomalous, so this well was not <br /> used in contour construction The groundwater flow direction on September 15, 2003, was to the <br /> northeast at a gradient of 0 0016 ft/ft Northeast groundwater flow direction has been observed during <br /> previous quarters <br /> TPHD and MTBE were reported in wells MW-4 and MWO-1X MTBE was also reported in wells MW-1, <br /> MW-2, and MWO-2 The laboratory report indicated that the reported concentration of TPHD in well <br /> MW0-1 X included additional compounds uncharacteristic of common fuels and lubricants The highest <br /> concentrations of TPHD (240 µg/L) and MTBE (57 pg/L) were reported in well MWO-1X These analytical <br /> data appear to be consistent with historical analytical data TPHD, TPHG, benzene, and MTBE <br /> concentrations at each monitoring well location are presented on Figure 3 <br /> ATTACHMENTS <br /> • Table 1 Groundwater Elevation and Analytical Summary <br /> • Table 2 Groundwater Analytical Results for Oxygenates and Additional Compounds <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contour Map (Third Quarter 2003) <br /> • Figure 3 Groundwater Analytical Summary (Third Quarter 2003) <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation <br /> P Voe s Truck PlazalQuarterly\2003Voe's Truck Plaza_3Q03 DOC 5 7W rus <br />