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Date- February 2,2004 <br /> Quarter. 41h Quarter,2003 <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg),benzene,ethylbenzene,MtBE, and tert-butyl alcohol(TBA)were <br /> reported above method detection limits in groundwater samples collected from site wells during this quarter In <br /> MW-2, TPHg and BTEX concentrations decreased to below method detection linuts and MtBE concentrations <br /> decreased to the lowest level reported above method detection limits historically TBA concentrations in MW-3 <br /> increased relative to previous sampling events TPHg concentrations increased in MW-4 but remains within historic <br /> ranges Concentrations of TPHg in MW-6 decreased relative to the previous quarterly monitoring event TBA was <br /> reported above method detection limits in MW-7 and AMW-5 this quarter MW-7 has a history of TBA <br /> contamination but the levels reported this quarter were significantly lower than in October of 2000 Otherwise, <br /> reported concentrations were generally consistent with historic data reported from previous sampling 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 0 007 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 1 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 Chain-of-Custody Records <br /> Appendix D Former Chevron and Former Scotty's Groundwater Monitoring Data <br /> Appendix E GeoTracker Upload Confirmation <br /> i <br /> K`Wproe w\JS EP ARCO%111941QaaOMy\4 QTR 03%1104 QMR 4Q03 doe Page 2 <br />