2023-08-31_ENFORCEMENT - M1982121

• Permit No: M1982121
• IBM Index Class Name: Enforcement
• Doc Date: 8/31/2023
• Doc Name: Rock Failure Analysis and Stability Report
• From: RMR Aggregates, Inc.
• To: DRMS
• Email Name: ACY
• Email Name: THM
• Media Type: D
• Archive: No

WL D UFF RMR Aggregates, Inc.
U N ❑ E R G R 0 U N C Rock Failure Analyses and Stabilization Report
ENGIN E E R I N G,I N C Mid Continent Limestone Quarry
Table of Contents
1. PROJECT BACKGROUND .................................................................................................................... 1
1.1. General Description ................................................................................................................... 1
1.2. Regional and Quarry Geology.................................................................................................... 1
2. SITE RECONNAISSACE........................................................................................................................3
2.1. January 26, 2023 —Site Reconnaissance....................................................................................3
2.2. April 14, 2023 —Site Reconnaissance ........................................................................................3
3. KINEMATIC ANALYSES OF FAILURE MODES......................................................................................4
4. STABILITY MODELING ANALYSES OF FAILURE MODES......................................................................6
5. ROCKFALL ..........................................................................................................................................7
5.1. Rockfall Modeling.......................................................................................................................7
5.2. Rockfall Mitigation Recommendations......................................................................................8
6. LONG-TERM STABILIZATION AND CONFIGURATION ......................................................................10
7. JULY 6 SITE RECONNAISSANCE........................................................................................................12
8. MINE STABILIZATION....................................................................................................................... 13
8.1. Active Mechanical Stabilization ...............................................................................................14
9. LIMITATIONS....................................................................................................................................15
APPENDICIES
Appendix A—2023 Field Photographs
Appendix B— Discontinuity and Structure Measurements
Appendix C— Kinematic Analyses
Appendix D— Planar Failure
Appendix E— Rockfall Modeling
Appendix F—July 2023 West Face Field Photographs
Appendix G—Active Stabilization Design
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