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e Date- January 14,2004 Quarter: 41 Quarter,2003 • DISCUSSION: TPHg, xylenes (total), and methyl tert-butyl ether (MtBE) were reported above method detection limits in groundwater samples collected from site monitoring wells during this sampling event Xylenes concentrations in MW-1 decreased this quarter TPI-Ig concentrations in MW-2 were reported at the highest concentration historically In MW-3, MtBE concentrations increased but remain within historic concentrations MtBE concentrations in wells MW-1, MW-2, and MW-4 were reported at the highest concentrations historically The following fuel oxygenates were added to the EPA Method 8260B analyte list this quarter, ethyl tert-butyl ether (EtBE), di-isopropyl ether (DIPE), and tert-amyl methyl ether (TAME) These analytes were reported as below method detection limits from all groundwater samples collected from site wells this quarter Groundwater elevations in site monitoring wells increased relative to the previous monitoring event The inferred direction of groundwater flow across the site was to the southwest at an average gradient that ranged from 0 0009 to 0 003 feet/foot This report is based on data, site conditions, and other information that are generally applicable as of the date of the report,and the conclusions and recommendations herein are therefore applicable only to that time frame TABLES: Table i Groundwater Elevation and Analytical Data Table 2 Fuel Oxygenates Analytical Data Table 3 Groundwater Gradient Data FIGURES )Figure 1 Groundwater Elevation Contours Figure 2 Groundwater Analytical Summary Figure 3 Concentration and Water Level Trends(Well MW-3) APPENDICES Appendix A Field Data Sheets Appendix B Sampling and Analysts Procedures Appendix C Analytical Reports and Chain-of-Custody Records Appendix D GeoTracker Upload Confirmation K VWpru ,OJS RP ARCOV 1191\Quanerly%QTR 0311 E 191 QMlR 4Q43 doc Page 2