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Date- October 10,2002 <br /> Quarter: Td Quarter,2002 <br /> cannot be made for MtBE These results are accepted based on LCS/LCSD percent recovery and/or RPD <br /> values <br /> DISCUSSION: <br /> TPHg, MtBE, and tert-butyl alcohol (TBA) were detected in groundwater samples collected during this quarter <br /> Concentrations of TPHg decreased considerably in wells MW-2, MW-3, and MW-4, relative to previous quarters <br /> Concentrations of MtBE and TBA increased in wells MW-1 through MW-3 and decreased in MW-4 Groundwater <br /> elevations in the monitoring wells decreased approximately 4 7 feet since the previous monitoring event The <br /> approximate direction of groundwater flow was to the south and southeast at an average gradient of 0 005 ft/ft <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-3) <br /> APPENDICES <br /> Appendix A Field Data Sheets <br /> Appendix B Sampling and Analysis Procedures <br /> Appendix C Analytical Reports and Cham-of-Custody Records <br /> K.U5$p ARCM111911Q..t.1y13 QTR 02111191 GVAMQ02&c Page 2 <br />