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C - <br /> Date August 19,2004 <br /> Quarter- 3`d Quarter,2004 <br /> DISCUSSION: <br /> GRO, methyl tert-butyl ether (MtBE), and tert-butyl alcohol (TBA) were reported above method detection limits in <br /> groundwater samples collected from site monitoring wells this quarter MtBE concentrations increased in monitoring <br /> wells MW-2 and MW-4 to the second highest levels reported historically TBA concentrations increased in MW-3 <br /> but remains within historic ranges MtBE concentrations in MW-5 continue to exhibit an increasing trend since <br /> sampling began during April 2003 Other analyte concentrations were generally consistent with previous sampling <br /> events <br /> i <br /> Groundwater elevations in site monitoring wells decreased relative to the previous monitoring event The inferred <br /> direction of groundwater flow across the site ranged from the northwest to the southwest at an average hydraulic <br /> gradient that ranged from 0 001 to 0 004 ft/ft <br /> This report is based on data, site conditions, and other information that are generally applicable as of the date of the <br /> report,and the conclusions and recommendations herein are therefore applicable only to that time frame <br /> TABLES: <br /> Table 1 Groundwater Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> FIGURES <br />• Figure 1 Groundwater Elevation Contours <br /> Figure 2 Groundwater Analytical Summary <br /> Figure 3 Concentration and Water Level Trends(Wel]MW-3) <br /> APPENDICES <br /> Appendix A Sampling and Analysis Procedures <br /> Appendix B Laboratory Analytical Report, Chain-of-Custody Documentation, and Field Data Sheets <br /> Appendix C GeoTracker Upload Confirmation <br /> K IWpr c.s V5 SP ARC0\111911Qaaner1y\3 QTR 04411191 CWMR 3Q04 du Page 2 <br />