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Date January 21,2003 <br /> Quarter 41h Quarter,2002 <br /> • • <br /> In the TPHg analysis of samples MW-1, MW-2, and MW-3, the hydrocarbon pattern present is within the <br /> gasoline quantitation range but does not resemble the pattern for gasoline <br /> DISCUSSION: <br /> TPHg, BTEX, and methyl tent-butyl ether (MtBE) were detected in groundwater samples collected during this <br /> quarter Concentrations of TPHg increased in wells MW-I and MW-2, relative to previous quarters BTEX <br /> compounds were reported above detection limits for the first time in wells MW-1 through MW-3 Concentrations of <br /> MtBE increased in MW-1, MW-2, and MW-3, relative to historic data The MtBE concentration in MW-4 <br /> rebounded to historic IeveIs (9,000 micrograms per liter [ug/1]) from the historic low concentration (1,900 pg/l) <br /> recorded in the third quarter 2002 Groundwater elevations in the monitoring wells decreased relative to the <br /> previous monitoring event The approximate direction of groundwater flow was to the south and southwest at an <br /> average gradient of 0 0008 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 Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> FIGURES <br /> Figure I 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 Chain-of-Custody Records <br /> K US BP ARC01111911Quaner"QTR 02/11191 QMR4QO2 dm Page 2 <br />