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Date January 2I,2003 <br /> Quarter. 41h Quarter,2002 <br /> • <br /> + In the TPHg analysts of samples AMW-5 and MW-4, the hydrocarbon pattern is present within the gasoline <br /> quantitation range but does not resemble the pattern for gasoline <br /> DISCUSSION: <br /> TPHg, benzene, toluene, ethylbenzene, total xylenes (BTEX), and methyl tert-butyl ether (MtBE) were detected in <br /> groundwater samples during this quarter Concentrations of TPHg, toluene, total xylenes and MtBE increased to the <br /> highest levels detected since the fourth quarter of 2000 in MW-6 All other reported concentrations were generally <br /> consistent with historic data reported from previous sampling events <br /> Groundwater elevations in the monitoring wells generally decreased relative to the previous monitoring event 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 /> Background information, including but not limited to previous field measurements, analytical results, site plans, and <br /> other data, has been furnished to URS by Group Environmental Management Company, its previous consultants, <br /> and/or third parties that URS has used in preparing this report URS has relied on this information as furnished URS <br /> is not responsible for nor has it confirmed the accuracy of this information <br /> Field measurements have been supplied by a groundwater sampling subcontractor URS has not performed an <br /> independent review of the field sampling data and is neither responsible for nor has confirmed the accuracy of these <br /> data <br /> TABLES <br /> Table 1 Groundwater Monitoring Data <br /> Table 2 Analytical Results for Oxygenates <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 /> K V5 HP ARM]11941QLwter"QTR 02111144 QMR4M do Page 2 <br />