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Date November 4,2002 <br /> Quarter 3rd Quarter,2002 <br /> • In the total petroleum hydrocarbons as gasoline (TPHg) analysis of sample ATR-8, the hydrocarbon pattern <br /> present is within the gasoline quantitation range but does not resemble the pattern for gasoline <br /> DISCUSSION: <br /> TPHg,benzene, toluene, ethylbenzene, xylenes (total) (BTEX), and methyl tert-butyl ether (MtBE) were reported in <br /> site wells this quarter Chemical concentrations were generally consistent with historical data The approximate <br /> direction of groundwater flow and the average gradient were consistent with historical trends Appendix A contains <br /> SVEIAS system operational data <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 Atlantic Richfield Company(ARCO), its previous consultants, and/or third <br /> parties that URS has used in preparing this report URS has relied on this information as furnished URS is not <br /> 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 I Groundwater Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contour Map <br /> Figure 2 Groundwater Concentration Map <br /> APPENDICES <br /> Appendix A Remedial System Performance Evaluation <br /> Appendix B Field and Laboratory Procedures <br /> Appendix C Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> • <br /> K VS BP ARC0\020931QuarterW_QTR 0212093 GWMR3Q02 doc page 2 <br />