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LIMITATIONS This report was prepared in general accordance with accepted standards of care that existed at the time this work was performed No other warranty, expressed or implied is made Conclusions and recommendations are based on field observations and data obtained from this work and previous investigations It should be recognized that definition and evaluation of geologic conditions is a difficult and inexact art Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the subsurface conditions present More extensive studies may be performed to reduce uncertainties This report is solely for the use and information of our client unless otherwise noted ATTACHMENTS • Table 1 Groundwater Elevation and Analytical Data • Table 2 Fuel Oxygenates Analytical Data • Table 3 Monitoring Plan Summary • Table 4 Physical Parameter Summary • Table 5 Analytical Parameter Summary • Figure 1 Site Location Map • Figure 2 Site Plan • Figure 3 Groundwater Elevation Contour Map, Upper Zone Wells (1 st Quarter 2006) • Figure 4 Groundwater Elevation Contour Map, Lower Zone Wells (1st Quarter 2006) • Figure 5 Groundwater Analytical Summary, Upper Zone Wells (1st Quarter 2006) • Figure 6 Groundwater Analytical Summary, Lower Zone Wells (1 st Quarter 2006) • Figure 7 DO Variation With Time (MW-1, MW-2, MW-5, MW-6, MW-7, and MW-9) • Figure 8 GRO, Benzene, MTBE, and Depth to Water Variation with Time at MW-4 • Figure 9 GRO, Benzene, MTBE, and Depth to Water Variation with Time at MW-5 • • Figure 10 GRO, Benzene, MTBE, and Depth to Water Variation with Time at MW-6 • Figure 11 GRO, Benzene, MTBE, and Depth to Water Variation with Time at MW-7 • Figure 12 GRO, Benzene, MTBE, and Depth to Water Variation with Time at MW-8 • Figure 13 COD and GRO Variation with Time at well MW-4 • Figure 14 COD and GRO Variation with Time at well MW-6 • Figure 15 COD and GRO Variation with Time at well MW-8 • Figure 16 Bio-Parameters and GRO Variation with Time at well MW-4 • Figure 17 Bio-Parameters and GRO Variation with Time at well MW-6 • Figure 18 Bio-Parameters and GRO Variation with Time at well MW-8 • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures • Appendix C Certified Analytical Reports with Chatn-of-Custody Documentation and EDF Verification • Appendix D Historical Analytical Tables K ISP-Arco for URS\5469\Quartcrly\2006\Arco_5469_1Q06 docPage 6 of 6 5TRATU5