ARCHIVED REPORTS_XR0002620 - Laserfiche WebLink

Home Browse Search

Groundwater Flow Direction Northeast is Groundwater Gradient 0 0005 and 0 0006 ft/ft DISCUSSION At the time of the fourth quarter 2004 monitoring event, groundwater elevations had decreased between 0 25 and 0 36 feet in all monitoring wells since the previous monitoring event (September 16, 2004) Depth-to-water measurements were corrected to mean sea level (MSL) and used to construct a groundwater elevation contour map (Figure 2) Groundwater flow beneath the site was to the northeast at a gradient of 0 0005 ft/ft Historically, groundwater flow in the monitoring well network has been towards the northeast, with occasional flow also towards the north, north-northwest, and east TPHD (200 pg/L) was reported in well MW-4 TPHG and MTBE were reported in wells MW-2, MW-3, MW-7, and MWO-1X MTBE was also reported in well MWO-2 The highest concentrations of TPHG (470 pg/L) and MTBE (700 pg/L) were reported In well MW-3 TAME (1 8 pg/L) was reported In well MW-3 BTEX, TBA, D1PE, ETBE, 1,2-DCA, 1,2-DBA, ethanol, or methanol were not reported in any of the wells These data are generally consistent with historical data The pH of all samples was above 2, but given the consistency of this quarter's results compared to historical data, the elevated pH does not appear to have adversely affected reported concentrations TPHD, TPHG, benzene, and MTBE concentrations at each monitoring well location are presented on Figure 3 ATTACHMENTS • Table 1 Groundwater Elevation and Analytical Summary • Table 2 Groundwater Analytical Results for Oxygenates and Additional Compounds • Figure 1 Site Location Map • Figure 2 Groundwater Elevation Contour Map (Fourth Quarter 2004) . • Figure 3 Groundwater Analytical Summary (Fourth Quarter 2004) • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation K Voe's Truck P1aza%Quarter1y12004Voe's Track Plaza-4Q04 DOC 5TRAWS