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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> Table 11 - Results of Existing and Proposed Stability Evaluations <br /> Factor of Safety <br /> Section Scenario Bishop Janbu GLE/ <br /> Simplified Simplified Spencer Morgenstern- <br /> Price <br /> Existing Left 3.168 2.962 3.202 3.173 <br /> XS East Existing Right 4.532 4.392 4.566 4.536 <br /> (-200) Proposed Left 1.455 1.428 1.486 1.46 <br /> Proposed Right 2.465 2.384 2.551 2.541 <br /> Existing Left 1.689 1.72 1.878 1.845 <br /> XS East Existing Right 3.059 2.982 3.088 3.065 <br /> (0) Proposed Left 1.558 1.54 1.562 1.562 <br /> Proposed Right 2.477 2.322 2.484 2.471 <br /> XS East Existing left 1.591 1.567 1.586 1.586 <br /> (200) Proposed Left 1.314 1.321 1.322 1.322 <br /> XS East Existing Left 3.04 2.952 3.113 3.113 <br /> (400) Proposed Left 1.397 1.384 1.419 1.407 <br /> Proposed Right 2.582 2.407 2.571 2.563 <br /> XS North Existing 2.221 2.09 2.22 2.214 <br /> (600) Proposed Right 1.288 1.292 1.292 1.292 <br /> Propose Left 1.382 1.378 1.378 1.378 <br /> XS North Existing 2.247 2.061 2.243 2.236 <br /> (800) Proposed Left 1.5 1.491 1.521 1.521 <br /> Proposed Right 1.423 1.416 1.476 1.45 <br /> XS North Existing 2.247 2.061 2.243 2.236 <br /> (1,000) Proposed Left 1.5 1.491 1.521 1.521 <br /> Proposed Right 1.423 1.416 1.476 1.45 <br /> XS North Existing 2.155 2.023 2.157 2.147 <br /> (1,200) Proposed Left 1.896 1.78 1.896 1.891 <br /> Proposed Right 3.073 3.031 3.11 3.08 <br /> A review of the reported factors of safety generally show a trend in which larger quantities of <br /> talc-gneiss decrease the FS, to a lowest value of 1.288. Detailed slope stability analyses and <br /> RocScience reports from the SLIDE2 analyses can be found in Appendix C, Calculations. <br /> 5.2.3.2 FLAC <br /> FLAC/Slope models were also created for 40/40 benches of competent material, talc-gneiss <br /> material, and for the full proposed configuration of 60/40 benches to 6600 followed by 40/40 <br /> benches to 6200 as an additional check of proposed local and global stability. The results of <br /> these evaluations are provided in Table 12, below. <br /> May 2023 1 27 <br />