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Date' March 23,2005 <br /> Quarter- I"Quarter,2005 <br /> DISCUSSION: <br /> Gasoline range organics (GRO), total xylenes, and methyl tert-butyl ether (MtBE) were detected above laboratory <br /> reporting limits in the groundwater samples collected from site wells ATR-5 (total xylenes and MtBE) and ATR-8 <br /> (GRO) this quarter In ATR-2 and ATR-6, MtBE was not detected above laboratory reporting lirmts (<05 <br /> micrograms per Iiter [µ91L])for the first time historically Benzene and total xylenes in ATR-4 and MtBE in ATR-8 <br /> were not detected above laboratory reporting limits during this sampling event In ATR-5, total xylenes were <br /> detected (1 2 9911-) for the first time since September 2002 Other analyte concentrations were generally consistent <br /> with historic data <br /> Groundwater elevation in site wells increased relative to the previous monitoring event The inferred direction of <br /> groundwater flow across the site generally ranged from the east to northeast at an average hydraulic gradient that <br /> ranged from 0 003 to 0 007 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 I Groundwater Elevation Contours <br /> Figure 2 Groundwater Analytical Summary <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Cham-of-Custody Documentation, and Field Data Sheets <br /> Appendix C GeoTracker Upload Confirmation <br /> K%Wp�cescV5 BP ARC01 20931Quanm1yl2005V093 GWMR 1W doc page 2 <br />