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1 Date June 20,2005 <br /> Quarter 2°d Quarter,2005 <br /> DISCUSSION: <br /> Methyl tert-butyl ether (MtBE) and tert-butyl alcohol (TBA) were detected above laboratory reporting limits in <br /> groundwater samples collected from site monitoring wells this quarter Gasoline range organics (GRO) was not <br /> detected above laboratory reporting hmits in groundwater samples collected from site wells due to increased <br /> reporting Iimits resulting from the laboratory requiring dilutions in the U S EPA Method 8260B analysis However, <br /> it is apparent that GRO concentrations decreased in MW-2 relative to the previous quarter MtBE concentrations <br /> decreased in site monitoring wells MW-1, MW-2, MW-3, MW-4, and MW-5 this quarter In MW-3, TBA <br /> concentrations increased but remain within historical ranges Other analyte concentrations were generally consistent <br /> with previous sampling events <br /> Groundwater elevations in site monitoring wells increased relative to the previous monitoring event The inferred <br /> direction of groundwater flow across the site was toward the southeast at an average hydraulic gradient of 0 002 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 /> APPENDICES <br /> Appendix A Sampling and Analysis Procedures <br /> Appendix B Laboratory Analytical Report,Cham-of-Custody Documentation, and Field Data Sheets <br /> Appendix C GeoTracker Upload Confirmation <br /> K 4Wnroceg05 RP ARCOU 119110uarter1y0005Q QIM 05511191 GWMR 2Q05 doc Page 2 <br />