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f' <br /> DISCUSSION <br /> At the time of the fourth quarter 2003 monitoring event, groundwater elevations have decreased between <br /> 0 22 feet and 0 83 feet in the monitoring wells since the September 15, 2003, monitoring event Depth-to- <br /> water measurements were corrected to mean sea level (MSL) and used to construct a groundwater <br /> elevation contour map (Figure 2) Groundwater flow beneath the site was virtually flat Off-site, <br /> groundwater flow was toward the north-northeast at a gradient of approximately 0 0019 ft/ft Historically, <br /> groundwater flow in the monitoring well network has been towards the northeast, with occasional flow also <br /> towards the north, north-northwest, and east <br /> TPHD (380 pg/L) and MTBE (4 2 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 (370 pg/L) and MTBE (960 pg/L) <br /> were reported in well MW-2 MTBE was also reported in wells MW-1 and MWO-2 TBA was reported in <br /> all wells this quarter at concentrations ranging from 5 7 pg/L to 57 pg/L TAME was reported in wells <br /> MW-2 (1 4 pg/L) and MW-3 (2 2 pg/L) The TPHD reported in well MW-4 is a historic high The MTBE <br /> reported in well MW-3 is a historic high TPHG is reported for the first time in wells MW-2, MW-3, and <br /> MWO-1X TBA is reported for the first time in wells MW-3 through MW-6, and MWO-1 through MWO-3 <br /> All other reported concentrations are within the historic limits 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 (Fourth Quarter 2003) <br /> • Figure 3 Groundwater Analytical Summary(Fourth 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 /> • <br /> P Voe's Truck P1azalQuarterly12003Voe's Truck Plaza-4Q03 DOC STRATUS <br />