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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> <br /> January 2024 | ii <br />Figure 6: Geologic Strength Index for Jointed Rocks................................................................ 21 <br />Figure 7: Scatter Plot of Laboratory Tested UCS Values and Categories for Design ................ 22 <br />Figure 8: Exposed Outcrop of Typical Morrison Quarry Competent Material ............................ 23 <br />Figure 9: Exposed Outcrop of Typical Morrison Quarry Talc-Gneiss Material .......................... 23 <br />Figure 10: Distribution of Discontinuity Sets and Foliations at Morrison Quarry ......................... 24 <br /> <br />Tables <br />Table 1 – Summary of 2022 Borings ........................................................................................... 9 <br />Table 2 – Summary of Historic UCS Testing ............................................................................. 10 <br />Table 3 – Summary of Historic Direct Shear Testing ................................................................. 11 <br />Table 4 – Summary of Recent UCS Testing .............................................................................. 13 <br />Table 5 – Summary of Recent Point Load Testing .................................................................... 14 <br />Table 6 – Summary of Recent Direct Shear Testing ................................................................. 15 <br />Table 7 – Summary of Aggregate Testing ................................................................................. 16 <br />Table 8 – Summary of Petrographic Analyses........................................................................... 17 <br />Table 9 – Selected Hoek-Brown Design Parameters................................................................. 21 <br />Table 10 – Distribution of Kinematic Analyses Results .............................................................. 25 <br />Table 11 – Results of Existing and Proposed Stability Evaluations ........................................... 26 <br />Table 12 – Summary of FLAC/Slope Results ............................................................................ 28 <br /> <br />Appendices <br />Appendix A: Subsurface Exploration Findings <br />Appendix B: Geologic Model <br />Appendix C: Calculations <br /> <br />