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Date June 28,2005 <br /> Quarter 2°d Quarter,2005 <br /> i <br /> DISCUSSION: <br /> Gasoline range organics (GRO),benzene,ethylbenzene, total xylenes,methyl tert-butyl ether (MtBE), and tert-butyl <br /> alcohol (TBA) were detected above laboratory reporting limits in groundwater samples collected from site wells <br /> during this quarter In AMW-5, MtBE and TBA were detected above laboratory reporting limits this quarter In <br /> AMW-6, MtBE was not detected above laboratory reporting limits (<0 5 micrograms per liter [hg/L]) for the first <br /> time historically Other analyte concentrations were generally consistent with historic site data <br /> Groundwater elevations in the site monitoring wells generally decreased relative to the previous monitoring event <br /> The inferred direction of groundwater flow across the site was toward the northwest at an average hydraulic gradient <br /> of 0 004 ft/ft Regionally, the inferred direction of groundwater flow was generally toward the northwest at an <br /> average 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,Chain-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 kWPMC ssJ5 BP ARCOU k 1941Q,=er1yQ005U QTR 05M 1194 GWMR 2Q05 do Page 2 <br />