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Date September 19,2002 <br /> Quarter 4th Quarter,2002 <br /> -i <br /> • The TPHG result for samples MW-3 and MW-5 is due to a discrete peak in the C6 - C7 range <br /> (probably MTBE and/or TBA) and does not represent gasoline In addition, the TPHG surrogate <br /> recovery for sample MW-3 was outside the laboratory limits <br /> • The TPHG result for sample MW-2R was based on a pattern in the C6 - C10 range and does not <br /> represent a full gasoline peak pattern <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHG), benzene, xylenes (total), methyl-tertiary-butyl-ether (MTBE), <br /> and tertiary-butyl-alcohol (TBA) were detected in groundwater samples during this quarter TBA was reported at a <br /> new high to VW-1 Otherwise,concentrations were consistent with those reported in previous sampling events <br /> Groundwater elevations in the monitoring wells decreased approximately 0 S feet since the previous monitoring <br /> event The calculated approximate groundwater flow direction was to the east and northeast The approximate <br /> gradient was 0 0009 to 0 001 <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, its previous consultants, and/or third <br /> parties that URS has used in preparing this report URS has felled 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 1 Groundwater Monitoring Data <br /> Table 2 Analytical Results for Oxygenates <br /> Table 2 Groundwater Gradient Data <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contours(Fourth Quarter 2002) <br /> Figure 2 Groundwater Analytical Summary(Fourth Quarter 2002) <br /> Figure 3 Concentration and Water Level Trends(Well MW-2/MW-2R) <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 /> KVS BP ARCO111193\QuanfftYW QTR-WZWMR doc Page 2 <br />