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DISCUSSION <br /> • At the time of the third quarter 2004 monitoring event, groundwater elevations had decreased between <br /> 0 03 and 0 47 feet In all monitoring wells since the previous monitoring event (June 29, 2004) <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 east at a <br /> gradient of 0 0008 ft/ft Off-site, groundwater flow was toward the east-northeast at a gradient of 0 0010 <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 510 „t ku)3 <br /> TPHD (510 pg/L) was reported in well MW-4 TPHG and MTBE were reported in wells MW-2, MW-3, <br /> MW-4, and MWO-1X MTBE was also reported in wells MW-7 and MWO-2 The highest con ntration of <br /> TPHG (240 pg/L) was reported to well MW-3 and the highest concentration of MTBE (48 pg/L) was <br /> reported in well MWOAX TAME (2 7 pg/L) was reported in well MW-3 BTEX, TBA, DIPE, ETBE, <br /> 1,2-DCA, 1,2-DBA, ethanol, or methanol were not reported in any of the wells These data are generally <br /> consistent with historical data TPHD, TPHG, benzene, and MTBE concentrations at each monitoring well <br /> 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 2004) <br /> • Figure 3 Groundwater Analytical Summary (Third 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 /> i <br /> P Voe's Truck P1aza\Qaarter1y12004Voe's Truck Plaza_3Q04 DOC STRATUS <br />