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5.4 West Quarry Global Stability Analysis <br /> Results for the West Quarry stability analyses are summarized in Table 11 below. Result <br /> figures are shown in Appendix C. In general, safety factors calculated by SLOPE/W were <br /> between 5.30 and 6.60 for all sets of strength properties. These factors of safety are well <br /> above the required 1.20. <br /> Table 11.West Quarry Global Stability Analysis Factor of Safet <br /> Case Strength Properties Factor of Safety <br /> c'(psf) 0' (deg) <br /> 1-1 0 48 5.37 <br /> 1-2 576 29 4.81 <br /> 2-1 0 48 6.60 <br /> 2-2 576 29 5.58 <br /> 5.5 Mafic Dike Sensitivity Analysis <br /> As described in Section 4.2.3, a sensitivity analysis was done to evaluate the smallest <br /> distance, x, between the edge of the excavated slope and the top of the mafic dike. Values of <br /> 200 ft, 100 ft, 50 ft, and 25 ft were considered for distance x in the analyses for both Mafic <br /> Dikes 2 and 4. Results are summarized in Table 12 below and result figures are shown in <br /> Appendix C. <br /> Table 12. Mafic Dike SensitivityAnal sis Factor of Safety <br /> Case Mafic Dike Distance,x(ft) Factor of Safety <br /> 1 2 200 >10 <br /> 2 2 100 >10 <br /> 3 2 50 >10 <br /> 4 2 25 >10 <br /> 5 4 200 >10 <br /> 6 4 100 >10 <br /> 7 4 50 >10 <br /> 8 4 25 >10 <br /> For all models run, the safety factors for the global stability of the highwall section were <br /> above 10. This is likely due to the relatively small thickness of the mafic dikes (5 ft) <br /> compared to the entire highwall. Although the weaker mafic dike would provide a plane <br /> along which instability could develop, its effects are not apparent when considering the <br /> stability of the full height of the highwall. <br /> Aggregate Industries Morrison Quarry GEI Consultants, Inc. <br /> AM-06 Geotechnical Stability Exhibit 37 August 2018 <br />