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i <br /> Date July 16,2004 <br /> 11 Quarter 2nd Quarter,2004 <br /> DISCUSSION: <br /> Gasoline range organics (GRO), benzene, ethylbenzene, total xylenes, methyl tert-butyl ether (MtBE), and 1,2- <br /> dichloroethane (1,2-DCA) were reported above method detection limits in groundwater samples collected from site <br /> wells this quarter Analyte concentrations were generally consistent with historical data with the following <br /> exceptions in MW-1, GRO, benzene, ethylbenzene, and total xylenes concentrations decreased this quarter GRO <br /> and benzene concentrations in MW-2 increased to levels last reported to August 2002 In MW-4, GRO, benzene, <br /> ethylbenzene, total xylenes and MtBE concentrations decreased relative to previous monitoring events Benzene was <br /> reported as below method detection limits for the first time historically in MW-5 In MW-6,GRO,toluene, and total <br /> xylenes concentrations decreased and benzene and ethylbenzene concentrations increased relative to the previous <br /> monitoring event GRO, benzene, and total xylenes were reported as below method detection limits in MW-7 1,2- <br /> DCA concentrations increased in MW-8 and MW-813 relative to the previous quarter but remain within historical <br /> ranges <br /> Groundwater elevations across the site increased relative to the previous quarter The inferred direction of <br /> groundwater flow across the site ranged from the northeast to the east-southeast at an average hydraulic gradient of <br /> 0 001 to 0 002 fdit <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 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 /> s <br /> K%Wpr sM BP ARC01021MQua erly\2 QTR 64%2168 GWMR 2Q04 d0c Page 2 <br />