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Date January 6,2003 <br /> Quarter. 3rd Quarter,2002 <br /> DISCUSSION: <br /> TPHg, benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl ter -butyl ether (MtBE), tert-butyl alcohol <br /> (TBA), tert-amyl methyl ether (TAME), and 1,2 Dichloroethane (1,2 DCA) were reported in monitoring wells <br /> sampled this quarter TPHg, BTEX, and MtBE levels have increased in MW-4 this quarter With the exception of <br /> MW-4, constituent concentrations were generally within historical ranges Groundwater elevations across the site <br /> decreased this quarter The calculated groundwater flow direction and average hydraulic gradient across the site <br /> were consistent with previous monitoring events Monitoring activity was coordinated with the Chevron located to <br /> the south of the ARCO property (at 508 Charter Way) this quarter However, URS was unable to obtain Chevron <br /> analytical and well survey data to complete the figures for this report <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,its previous consultants,and/or third parties <br /> that URS has used in preparing this report URS has relied on this information as furnished URS is not responsible <br /> 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 1 Groundwater Elevation Contours <br /> Figure 2 Groundwater Analytical Summary <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> • <br /> K V5 BP ARC0\02168\3_QTR 02L2168 GWMR3QD2 do Page 2 <br />