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January 3, 2025 <br />HWA Project No. 2021-159-21 <br /> <br /> <br />Geotechnical Engineering Report iii HWA GEOSCIENCES INC. <br />Port Gardner Storage Facility <br />LIST OF FIGURES (Following Text) <br /> <br />Figure 1 Site and Vicinity Map <br />Figure 2 Site & Exploration Plan <br />Figure 3A Geologic Cross Section A-A’ <br />Figure 3B Geologic Cross Section B-B’ <br />Figure 4A Soils Susceptible to Liquefaction (Along Cross Section A-A’) <br />Figure 4B Soils Susceptible to Liquefaction (Along Cross Section B-B’) <br />Figure 5 Piezometer Report <br />Figure 6A Buoyant Force Parameters for Underground Structures <br />Figure 6B Permanent Earth Pressures for Underground Structures <br />Figure 6C Surcharge Pressures Diagrams <br />Figure 7 Typical Utility Trench Detail <br />Figure 8A Lateral Earth Pressures for Cantilever Temporary Shoring <br />Figure 8B Lateral Earth Pressures for Braced Temporary Shoring <br /> <br />LIST OF TABLES <br /> <br />Table 1. Seismic Design Parameters, Site Class E* ..................................................................... 15 <br />Table 2. Required Ultimate Axial Pile Capacity – Proposed Pile-Supported Areas .................... 29 <br />Table 3. Down Drag Loading – Proposed Pile-Supported Areas ................................................. 31 <br />Table 4. Ultimate Uplift Pile Capacity – Proposed Pile-Supported Areas ................................... 34 <br /> <br />APPENDICES <br />Appendix A: Field Explorations <br />Figure A-1 Legend of Terms and Symbols Used on Exploration Logs <br />Figures A-2 through A-21 Logs of Borings HWA-1 through HWA-20P <br />ConeTec, Inc. Report dated November 28, 2023 <br />Appendix B: Geotechnical Laboratory Testing Program <br />Figures B-1 through B-6 Summary of Material Properties <br />Figures B-7 through B-31 Particle Size Analysis of Soils <br />Figures B-32 through B-34 Liquid Limit, Plastic Limit and Plasticity Index of Soils <br />Figures B-35 through B-39 Direct Shear Test of Soils Under Consolidated Drained Conditions <br /> <br />Appendix C: Environmental Soil and Groundwater Laboratory Analytical Results <br />Appendix D: Previous Explorations by Others <br />Appendix E: Aquifer Pump Tests <br />Appendix F: Limit Equilibrium Global Slope Stability Evaluation <br />Appendix G: Lateral Soil Spring Constants