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Date. April 29,2004 <br /> Quarter V Quarter,2004 <br /> DISCUSSION: <br /> Gasoline range organics (GRO), benzene, ethylbenzene, methyl tert-butyl ether (MtBE), and tert-butyl alcohol <br /> (TBA) were reported above method detection lynuts in groundwater samples collected from site wells during this <br /> quarter In MW-2, MtBE and TBA concentrations increased but remain significantly below historic high ranges In <br /> MW-3,TBA concentrations continue to increase and MtBE concentrations increased relative to the previous quarter <br /> In MW-4, GRO and MtBE concentrations decreased and TBA was reported at the highest level historically This is <br /> the first time since April 2001 that TBA was reported above method detection limits in MW-4 In MW-5,GRO was <br /> reported as below method detection limits for the first time since January 2002 GRO and ethylbenzene <br /> concentrations increased in MW-6 relative to the previous quarter MtBE and TBA concentrations ;increased in <br /> MW-7 TBA concentrations decreased from 120 micrograms per liter (jig/L) to 28 AgIL in AMW-5 this quarter <br /> Otherwise, reported concentrations were generally consistent with historic data reported from previous sampling <br /> events <br /> Groundwater elevations in the site monitoring wells generally increased relative to the previous monitoring event <br /> The inferred direction of groundwater flow was to the northwest at an average gradient of 0 009 feet/foot (ft/ft) A <br /> regional groundwater elevation contour map and a regional groundwater analytical summary were created with data <br /> from the former Chevron service station at 575 Grant Line Road and the former Scotty's service station at 574 Grant <br /> Line Road <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 Monitoring 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 /> Figure 3 Concentration and Water Level Trends(Well MW-2) <br /> APPENDICES <br /> Appendix A Field Data Sheets <br /> Appendix B Sampling and Analysis Procedures <br /> Appendix C Laboratory Analytical Reports and Cham-of-Custody Records <br /> Appendix D Former Chevron and Former Scotty's Groundwater Monitoring Data <br /> Appendix E GeoTracker Upload Confirmation <br /> .f <br /> K%WWOCessl35 BP ARCOU 11941Qa nerlyXI QTR 04U 1194 GWMR 1Q04 doe Page 2 <br />