Laserfiche WebLink
,i <br /> DISCUSSION <br /> Petroleum hydrocarbons were not detected in samples collected from monitoring well MW-1, MW-3, <br /> MW-4, MW-6, or MW-7 Benzene was detected in the sample collected from monitoring wells MW-2 <br /> (0 62 �LgIL) Toluene was detected in sample collected from monitoring well MW-5 (0 61µg/L) MTBE <br /> was detected in the samples collected from monitoring wells MW-2 (2 5 µg/L)and MW-5 (35 fcg/L) These <br /> data are similar to data for previous quarters <br /> The groundwater flow direction was calculated toward the east-southeast at an average gradient of <br /> 0 0016 ft/ft Groundwater elevations in the monitoring wells decreased by more than 2 5 feet since the <br /> previous sampling event (December 2001) <br /> Delta is currently infecting ambient air at low flow rates through sparge wells AS-1, AS-2, and AS-3 Two <br /> site visits were conducted during the first quarter 2002, to monitor and optimize the performance of the air <br /> bubbling system A Delta technician recorded down-well DO data and air bubbling flow rates during the <br /> site visits Table 3 presents dissolved oxygen concentrations in select wells <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Dissolved Oxygen Concentrations <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contours (First Quarter 2002) <br /> • Figure 3 Groundwater Analytical Summary(First Quarter 2002) <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Chain-of-Custody Records <br /> P 1ARCO121301QTRLY120021Arco_2130_1Q02 doc Delta <br />