ARCHIVED REPORTS_XR0005856 CASE 2

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4 Date January 21,2004 Quarter 4 i Quarter 2003 • DISCUSSION Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, total xylenes, and methyl tert-butyl ether (MtBE) were reported in groundwater samples collected from site well this reporting period MtBE concentrations in MW-6 continue a decreasing trend Low-level concentrations of toluene and total xylenes in MW-11 and low- level concentrations of benzene,toluene, and total xylenes were reported above method detection limits in MW-13D for the first time since sampling began in July 2003 No other analytes were detected above laboratory reporting limits in site wells Methanol and organic lead were added to the analyte list this quarter Methanol was reported as below method detection Itiruts in all groundwater samples collected from site wells this quarter Organic lead was only analyzed in the MW-6 groundwater sample and was reported as below method detection limits Groundwater elevations slightly decreased relative to the previous quarter The inferred direction of groundwater flow was to the north/northwest at an average hydraulic gradient of 0 002 feettfoot, which is consistent with historic data 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 1 Groundwater Elevation and Analytical Data Table 2 Fuel Oxygenates Analytical Data Table 3 Organic Lead Analytical Data Table 4 Groundwater Gradient Data FIGURES Figure 1 Groundwater Elevation Contours Figure 2 Groundwater Analytical Summary APPENDICES Appendix A Field and Laboratory Procedures Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets Appendix C GeoTracker Upload Confirmation K 1Wproee"S)5 RP ARC0V0W20\Quarter1y%4 QTR 0316020 GWMR 4Q03 doc Page 2