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Date: October 15,2002 <br /> Quarter: 3rd Quarter,2002 <br /> • DISCUSSION: <br /> TPHG, benzene, ethylbenzene, xylenes (total), methyl tert-butyl ether (MTBE), and several volatile organic <br /> compounds (VOCs) were reported in wells sampled this quarter at concentrations consistent with previous quarterly <br /> monitoring events Three new nested wells were added to the monitoring schedule this quarter The nested wells are <br /> designated MW-8M/8D, MW-9M19D, and MW-10M/lOD Groundwater elevations decreased an average of 0 65 <br /> feet during the quarter The calculated groundwater flow direction was to the northeast at an approximate gradient of <br /> 0 012 feet per foot(ft/ft) Groundwater flow direction and gradient were consistent with previous quarters <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 linuted to previous field measurements,analytical results, site plans, and <br /> other data has been furnished to URS by ARCO, its previous consultants, and/or third parties that URS has used in <br /> preparing this report URS has relied on this information as furnished URS is not responsible for nor has it <br /> 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 Volatile Organic Compounds Analytical Data <br /> Table 4 Groundwater Gradient Data <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contour Map <br /> Figure 2 Groundwater Concentration Map <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> I <br /> K 115 BP nRC004493%Q..nerW_QTrR 02�GWMR Ja. Page 2 <br />