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Table 4. Percentage of Poles Possibly Causing Toppling Failure <br /> Face and %of Set <br /> Angle <br /> E 67 9.52 <br /> E 67 7.09 <br /> E 67 22.1 <br /> E 67 10.16 <br /> E 85 14.06 <br /> E 85 7.09 <br /> E 85 32.98 <br /> E 85 12.66 <br /> W 45 8.18 <br /> W 45 8.96 <br /> W 45 13.73 <br /> W 45 6.24 <br /> W 85 19.12 <br /> W 85 8.96 <br /> W 85 23.71 <br /> W 85 19.43 <br /> 5.2 Global Stability Analysis <br /> The results for the SLOPE/W and FLAC/Slope modeling are listed in Table 5 and Table 7. <br /> Table 5 and Table 7 also presents a summary of the bench configurations analyzed for the <br /> two cases described in Section 4.2. The column titled"Number of Benches above <br /> Intermediate Bench" describes the number of smaller benches, defined by the columns titled <br /> "Bench Height" and "Bench Face Angle", between the intermediate benches. Analysis result <br /> figures are presented in Appendices B and C and critical failure surfaces along with factors <br /> of safety are shown for each analysis case. <br /> Due to the inherent uncertainty in spatial variability of materials on site, additional global <br /> stability analyses were performed with lower material strengths. The strength reduction <br /> method, as used in FLAC/Slope and described in Section 4.2.2, was used to estimate strength <br /> properties that would still meet stability criteria for both cases. A targeted factor of safety of <br /> 1.40 was used to estimate cohesion and friction angles by modifying the strength reduction <br /> equations: <br /> trial _ 1.40 <br /> C — Fglobal C <br /> trial 1.40 <br /> cp = arctan(F9lobal tanV) <br /> Aggregate Industries Morrison Quarry GEI Consultants, Inc. <br /> South Quarry Highwall Design Technical Revision 21 August 2017 <br />