2023-10-31_REVISION - M1973021 ‎(15)‎

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 10/31/2023
• Doc Name Note: Attachment A - Rule 6.5 Geotech Stability Exhibit - Intro and Table of Contents
• Doc Name: Request for Technical Revision
• From: Holcim - WCR, Inc.
• To: DRMS
• Type & Sequence: TR9
• Media Type: D
• Archive: No

Geotechnical Stability Exhibit ���
Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry
Figure 5: Values of constant mi for intact rock by rock group (Hoek, 2000)..............................20
Figure 6: Geologic Strength Index for Jointed Rocks................................................................21
Figure 7: Scatter Plot of Laboratory Tested UCS Values and Categories for Design................22
Figure 8: Exposed Outcrop of Typical Morrison Quarry Competent Material ............................23
Figure 9: Exposed Outcrop of Typical Morrison Quarry Talc-Gneiss Material ..........................23
Figure 10: Distribution of Discontinuity Sets and Foliations at Morrison Quarry.........................24
Table 1 — Summary of 2022 Borings...........................................................................................8
Table 2 — Summary of Historic UCS Testing .............................................................................10
Table 3 — Summary of Historic Direct Shear Testing.................................................................11
Table 4 — Summary of Recent UCS Testing..............................................................................13
Table 5 — Summary of Recent Point Load Testing ....................................................................14
Table 6 — Summary of Recent Direct Shear Testing .................................................................15
Table 7 — Summary of Aggregate Testing.................................................................................16
Table 8 — Summary of Petrographic Analyses...........................................................................17
Table 9 — Selected Hoek-Brown Design Parameters.................................................................21
Table 10 — Distribution of Kinematic Analyses Results..............................................................25
Table 11 — Results of Existing and Proposed Stability Evaluations ...........................................27
Table 12 —Summary of FLAC/Slope Results............................................................................28
Appendices
Appendix A: 2022 Subsurface Exploration Findings
Appendix B: Geologic Model
Appendix C: Calculations
May 2023 1 ii