2021-10-11_REVISION - M1973021 ‎(5)‎

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 10/11/2021
• Doc Name Note: Adequacy2 AM7 Appendices
• Doc Name: Adequacy Review Response #2
• From: Aggregate Industries
• To: DRMS
• Type & Sequence: AM7
• Media Type: D
• Archive: No

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Aggregate Industries – Morrison Quarry GEI Consultants, Inc.
AM-07 Geotechnical Stability Exhibit November 2020

Table of Contents

1. Introduction ................................................................................................... 1
1.1 General .................................................................................................. 1
1.2 Site Description ...................................................................................... 1
1.3 Scope of Work ....................................................................................... 2
2. Geology .......................................................................................................... 4
2.1 Regional Geology .................................................................................. 4
2.2 Morrison Quarry Site Geology ............................................................... 4
2.2.1 Rock Types ................................................................................ 5
2.2.2 Structure .................................................................................... 7
3. South and West Quarry Studies ................................................................ 10
3.1 Geotechnical Studies ........................................................................... 10
3.1.1 Pre-2017 Geotechnical Explorations ....................................... 10
3.1.2 2017 Geotechnical Explorations .............................................. 11
3.1.3 2018 Geotechnical Explorations .............................................. 11
3.2 Annual Inspections .............................................................................. 13
3.3 Groundwater ........................................................................................ 13
3.4 3D Geological Model ........................................................................... 13
4. Laboratory Analyses ................................................................................... 14
4.1 Pre-2017 Laboratory Analyses ............................................................ 14
4.2 2017 Laboratory Analyses ................................................................... 14
4.3 2018 Laboratory Analyses ................................................................... 16
5. Rock Mass Characterization ...................................................................... 18
5.1 Hoek-Brown ......................................................................................... 18
5.2 Rock Mass Rating ................................................................................ 20
5.3 Q-system ............................................................................................. 21
5.4 Rock Mass Characterization Summary ................................................ 23
6. Stability Analyses Methodology ................................................................ 25
6.1 Key Assumptions ................................................................................. 25
6.2 Kinematic Analyses ............................................................................. 25
6.2.1 South Quarry ........................................................................... 27
6.2.2 West Quarry ............................................................................. 27
6.3 Rock Slope Stability Analyses ............................................................. 28
6.3.1 General .................................................................................... 28