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Date: January 21,2004 <br /> " Quarter 4h Quarter,2003 <br /> • DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl. <br /> tent-butyl ether (MtBE), and 1,2-dichloroethane (1,2-DCA) were reported above method detection limits in <br /> groundwater samples collected from site wells this quarter Analyte concentrations were generally consistent with <br /> historical data with the following exceptions TPHg, ethylbenzene, and total xylenes concentrations decreased in <br /> MW-1 to the lowest concentrations reported historically The reported concentrations of TPHg, BTEX, and MtBE <br /> in samples MW-4 and MW-6 have uncharacteristically decreased and,as discussed in the analytical data review,will <br /> be reevaluated next quarter Groundwater elevations across the site increased relative to the previous quarter The <br /> inferred direction of groundwater flow and average hydraulic gradient were consistent with previous monitoring <br /> events <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 I 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 /> K 1WpmcessV5 6P ARCO'r0 I MQaarter"QTR 0M2169 GWMR 4Q03 doc Page 2 <br />