2018-09-06_REVISION - M1973021

• Permit No: M1973021
• IBM Index Class Name: REVISION
• Doc Date: 9/6/2018
• Doc Name Note: PART 2 OF 7
• Doc Name: Request For Amendment To Permit
• From: GEI Consultants
• To: DRMS
• Type & Sequence: AM6
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Table 6. Percentage of Poles Possibly Causing Toppling Failure in South Quarry
Face and % of Set
Angle
E 67 9.52
E 67 7.09
E 67 22.1
E 67 10.16
E 85 14.06
E 85 7.09
E 85 32.98
E 85 12.66
W 45 8.18
W 45 8.96
W 45 13.73
W 45 6.24
W 85 19.12
W 85 8.96
W 85 23.71
W 85 19.43
5.2 West Quarry Kinematic Analyses
As with the South Quarry kinematic analysis, the West Quarry kinematic analysis provides a
factor of safety based on measured geometry and Mohr-Coulomb strength parameters. A
factor of safety below 1.2 indicates the potential for failure; the higher the factor of safety,
the more stable the bench. Worst case results for the SWedge kinematic analyses of the West
Quarry are listed in Table 3. The column titled"Analysis Description'describes both
whether planar, wedge, or rock toppling (direct, flexural, and oblique) analysis was
conducted. Analysis result figures are presented in Appendix D.
The planar sliding and toppling analysis are independent of the highwall orientation. Since
the geometry of the slope and structural discontinuities are assumed to be the same in the
West Quarry as the South Quarry, no separate analysis of the West Quarry was performed.
The toppling factor of safeties developed for the South Quarry are assumed to be valid for the
West Quarry.
There were 12 wedge sliding simulations with a factor of safety indicating potential failure in
the four highwalls within the West Quarry. The results show that global failures are highly
unlikely, and small, localized failures of a single bench or highwall are more likely to occur.
The failure of a single bench or highwall is unlikely to propagate. The individual bench
analyses that indicated areas of concern are most likely due to the orientation of joints. These
joints causing localized areas of concern do not extend a sufficient distance into the highwall
to develop global failure.
Aggregate Industries Morrison Quarry GEI Consultants, Inc.
AM-06 Geotechnical Stability Exhibit 29 August 2018