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Table of Contents <br />Page <br />1.0 Introduction 1 <br />1.1 Site Description 1 <br />2.0 Investigation 1 <br />3.0 Site Conditions 2 <br />3.1 Geology 2 <br />3.2 Surface Conditions 2 <br />3.3 Subsurface Conditions 3 <br />4.0 Conclusions 3 <br />4.1 Portal Slope Stability 3 <br />5.0 Recommendations 3 <br />5.1 Portal Slope 3 <br />5.2 Retaining Walls 4 <br />5.3 Portal Exit Design Loads 5 <br />5.4 Portal Access Road 5 <br />6.0 References 5 <br />List of Tables <br />Table 1 Design Lateral Earth Pressures <br />Table 2 Design Pressures on Portal Structure for Various Heights of Compacted Fill <br />List of Figures <br />Figure 1 Location Map <br />Figure 2 Site Map <br />Figure 3 Photograph of Slope Above Chief Portal <br />Figure 4 Typical Fill Over Slope Construction <br />List of Appendices <br />Appendix A Test Pit Logs <br />Appendix B Laboratory Testing Results <br />Rule 6.5 Geotechnical Stability Report <br />Chief Portal <br />March 16, 2013 <br />Page ii <br />