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IIS <br /> DISCUSSION <br /> At the time of the first quarter 2004 monitoring event, groundwater elevations had Increased between 0 89 <br /> and 174 feet in all monitoring wells since the previous monitoring event (December 19, 2003) <br /> Depth-to-water measurements were corrected to mean sea level (MSL) and used to construct a <br /> groundwater elevation contour map (Figure 2) Groundwater flow beneath the site was to the north at a <br /> gradient of 0 0009 ft/ft Off-site, groundwater flow was toward the east-southeast at a gradient of 0 0008 <br /> ft/ft Historically, groundwater flow in the monitoring well network has been towards the northeast, with <br /> occasional flow also towards the north, north-northwest, and east <br /> TPHD (190 pg/L) and MTBE (4 1 pg/L) were reported in well MW-4 TPHG and MTBE were reported in <br /> wells MW-2, MW-3, and MWO-1X The highest concentrations of TPHG (470 fag/L) and MTBE (780 pg/L) <br /> were reported in well MW-2 MTBE was also reported in wells MW-1 and MWO-1 TBA was reported In <br /> wells MW-1, MW-2, MW-3, MWO-1, and MWO-1X, with the highest concentration (58 deg/L) reported In <br /> well MW-2 TAME (2 0 dig/L) was reported in well MW-2 DIPE, ETRE, 1,2-DCA, 1,2-DBA, ethanol, or <br /> methanol were not reported in any of the wells Except for the MTBE results In wells MWO-1 and <br /> MWO-2, these data are generally consistent with historical data Stratus will continue quarterly monitoring <br /> and sampling to evaluate these changes TPHD, TPHG, benzene, and MTBE concentrations at each <br /> 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 (First Quarter 2004) <br /> • Figure 3 Groundwater Analytical Summary (First Quarter 2004) <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 /> • <br /> P hoe's Truck P1azalQuarterly12004Voe's Truck Plaza—IQ04 DOC 5TRAW5 <br />