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Date April 12,2005 <br /> Quarter V Quarter,2005 <br /> • DISCUSSION: <br /> Gasoline range organics (GRO), benzene, ethylbenzene, total xylenes, and methyl tert-butyl ether (MtBE) were <br /> detected above laboratory reporting limits in groundwater samples collected from site wells during this quarter <br /> MtBE was not detected above laboratory reporting limits(<0 5 micrograms per liter [pg/LJ) in AMW-5 for the first <br /> time historically Other analyte concentrations were generally consistent with historic site data <br /> I <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 toward the northwest at an average hydraulic gradient of 0 009 ft/ft <br /> Regionally, the inferred direction of groundwater flow ranged from the northwest to northeast at an average <br /> hydraulic gradient of 0 007 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 /> K MproceuU5 BP ARCOUI1941Qua1erly1200511 QTR 051111946WMR IQ05 dm Page 2 <br />