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Date. December 22,2004 <br /> Quarter: 0'Quarter,2004 <br /> DISCUSSION: <br /> GRO, ethylbenzene, methyl tert-butyl ether (MtBE), and tert-butyl alcohol (TBA) were detected above laboratory <br /> reporting limits in groundwater samples collected from site wells during this quarter GRO,ethylbenzene,and MtBE <br /> concentrations in MW-4 and MtBE concentrations in MW-6 increased relative to previous quarters but remain <br /> within historic ranges Other analyte concentrations were generally consistent with historic site data <br /> Groundwater elevations in the site monitoring wells increased relative to the previous monitoring event The inferred <br /> direction of groundwater flow across the site was to the northwest at an average hydraulic gradient of 0 006 ft/ft <br /> Regionally, the inferred direction of groundwater flow was toward the northwest at an average hydraulic gradient of <br /> 0 009 ft/ft <br /> A regional groundwater elevation contour map (Figure 1) and a regional groundwater analytical summary(Figure 2) <br /> were created with data from the former Chevron service station at 575 Grant Line Road and the former Scotty's <br /> service station at 574 Grant Line Road Groundwater elevation and analytical data from the former Chevron and <br /> former Scotty's service stations are attached as Appendix C <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 /> Table 4 Monitoring Well Construction Data <br /> FIGURES <br /> Figure 1 Regional Groundwater Elevation Contours <br /> Figure 2 Groundwater Analytical Summary <br /> APPENDICES <br /> Appendix A Sampling and Analysis Procedures <br /> Appendix B Laboratory Analytical Reports,Cham-of-Custody Documentation, and Field Data Sheets <br /> Appendix C Former Chevron and Former Scotty's Groundwater Monitoring Data <br /> Appendix D GeoTracker Upload Confirmation <br /> i <br /> K\WprocessV5 BP ARCMI]194lQuaner1y12004V QTR 04/11194 GWMR 4Q04 doc Page 2 <br />