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<br />ii <br />Aggregate Industries – Morrison Quarry GEI Consultants, Inc. <br />AM-07 Geotechnical Stability Exhibit November 2020 <br /> <br /> <br />6.3.2 SLOPE/W ................................................................................ 29 <br />6.3.3 FLAC/Slope ............................................................................. 29 <br />6.3.4 Material Properties used in Stability Analyses ......................... 30 <br />6.3.5 South Quarry ........................................................................... 31 <br />6.3.6 West Quarry ............................................................................. 31 <br />7. Stability Analyses Results .......................................................................... 32 <br />7.1 Kinematic Analyses ............................................................................. 32 <br />7.1.1 South Quarry Kinematic Analyses ........................................... 32 <br />7.1.2 West Quarry Kinematic Analyses ............................................ 36 <br />7.2 Slope Stability Analyses....................................................................... 36 <br />7.2.1 South Quarry ........................................................................... 36 <br />7.2.2 West Quarry Global Stability Analyses .................................... 38 <br />8. Recommendations ...................................................................................... 40 <br />8.1 Highwall Recommendations ................................................................ 40 <br />8.1.1 Recommendations for Rock Mass Stability ............................. 40 <br />8.1.2 Recommendations for Kinematic Stability ............................... 41 <br />8.2 Rock Cut Highwall Performance Monitoring Recommendations .......... 42 <br />8.2.1 Visual Inspection Monitoring .................................................... 43 <br />8.2.2 Survey Monitoring .................................................................... 43 <br />8.3 Highwall Reclamation Recommendations............................................ 44 <br />9. Limitations ................................................................................................... 45 <br />10. References ................................................................................................... 46 <br /> <br /> <br />List of Figures in Text <br />Figure 2-1. Stereonet plots showing poles to planes with average joint set windows for the South <br />Quarry (upper) and West Quarry (lower). <br />Figure 5-1. Hoek-Brown Failure Criterion for local stability (left) and global stability (right). <br />Figure 5-2. Histogram showing distribution of low and high low RMR ranges measured in the active <br />South Quarry as observed in the annual highwall inspections for the years between <br />2013 and 2019. <br />Figure 5-3. Histogram showing the distribution of RQD measurements as measured in rock cores <br />from the South Quarry. <br />Figure 5-4. Excerpt from Hoek-Brown (1988) where rock mass parameters are compared using the <br />different methods discussed in this section. The inset on the right summarizes the input <br />parameters selected for Morrison Quarry <br />Figure 6-1. Plan view showing the proposed mine configuration for the South and West Quarry’s, <br />with thick red and blue lines showing the highwall orientations evaluated in the kinematic <br />analyses. The contour shading shown represents the mining phase operations as noted. <br /> <br />