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el <br /> Approximate Depth to Groundwater 7 14 to 8 26 feet below top of well casing <br /> Groundwater Flow Direction East-northeast T <br /> Groundwater Gradient 0 0008 and 0 0011 ft/ft <br /> DISCUSSION <br /> At the time of the first quarter 2005 monitoring event, groundwater elevations had Increased between 1 83 <br /> and 2 00 feet in all monitoring wells since the previous monitoring event (December 2, 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 <br /> east-northeast at gradients of 0 0008 and 0 0011 ft/ft Historically, groundwater flow In the monitoring well <br /> network has been towards the northeast, with occasional flow also towards the north, north-northwest, and <br /> east <br /> TPHD (200 pg/L) was reported in well MW-4 The laboratory noted that the diesel concentration reported <br /> in well MW-4 may Include some undifferentiated heavier-end hydrocarbons TPHG and MTBE were <br /> reported in wells MW-2, MW-3, and MWO-1X MTBE was also reported in wells MW-4, MW-7, and <br /> MWO-2 The highest concentrations of TPHG (390 pg/L) and MTBE (630 pg/L) were reported In well <br /> MW-3 TAME (3 1 dig/L) was reported In well MW-3 BTEX, TBA, DIPE, ETBE, 1,2-DCA, 1,2-DBA, <br /> ethanol, or methanol were not reported in any of the wells These data are generally consistent with <br /> historical data The pH levels of all samples except wells MW-6 and MWO-1 were above 2, but given the <br /> consistency of this quarter's results compared to historical data, the elevated pH does not appear to have <br /> adversely affected reported concentrations 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 /> a 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 2005) <br /> • Figure 3 Groundwater Analytical Summary (First Quarter 2005) <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 /> K floe's Truck Plaza\Quarterly12005Voe's Truck Plaza—]Q05 DOC 57-RATU5 <br />