2022-12-22_REVISION - M1987164 ‎(19)‎

• Permit No: M1987164
• IBM Index Class Name: Revision
• Doc Date: 12/22/2022
• Doc Name Note: Geotechnical Stability Exhibit
• Doc Name: Request For Amendment To Permit
• From: Oldcastle SW Group, Inc. dba United Companies
• To: DRMS
• Type & Sequence: AM4
• Email Name: HR1
• Email Name: MAC
• Email Name: AWA
• Media Type: D
• Archive: No

Trial positions within range: 15 15 25
- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -
RESULTS:Analysis 4-Final Mining Highwall Slope Stability
Bishop Simplified Method of Analysis-Circular Failure Surface
---------------------------------------------------------------
Critical Failure Surface Search using Multiple Circle Generation Techniques
Factor of Safety for initial failure surface approximation: 2.048
There were:3738 successful analyses from a total of 5625 trial surfaces
1887 analyses terminated due to unacceptable geometry
Critical(minimum)Factor of Safety: 1.94
------------------------------------------
Results Summary-Lowest 99 Factor of Safety circles
----------------------------------------------------
Circle X-Left Y-Left X-Right Y-Right X-Centre Y-Centre Radius FoS
1 77.30 6480.00 139.20 6451.14 260.75 6792.65 362.50 1.936 <--Critical Surface
2 77.30 6480.00 139.20 6451.14 260.31 6791.71 361.46 1.936
3 77.30 6480.00 139.20 6451.14 259.86 6790.76 360.42 1.936
4 77.30 6480.00 139.20 6451.14 259.42 6789.81 359.38 1.937
5 77.30 6480.00 139.20 6451.14 258.98 6788.86 358.33 1.937
6 77.30 6480.00 139.20 6451.14 258.54 6787.91 357.29 1.937
7 77.30 6480.00 139.20 6451.14 258.09 6786.96 356.25 1.937
8 77.30 6480.00 139.20 6451.14 257.65 6786.02 355.21 1.938
9 77.30 6480.00 139.20 6451.14 257.21 6785.07 354.17 1.938
10 77.30 6480.00 139.20 6451.14 256.77 6784.12 353.12 1.938
11 77.30 6480.00 139.20 6451.14 256.33 6783.17 352.08 1.938
12 77.30 6480.00 139.20 6451.14 255.88 6782.22 351.04 1.939
13 77.30 6480.00 139.20 6451.14 255.44 6781.27 350.00 1.939
14 77.30 6480.00 139.20 6451.14 255.00 6780.32 348.96 1.939
15 77.30 6480.00 139.20 6451.14 254.56 6779.38 347.92 1.939
16 77.30 6480.00 139.20 6451.14 254.11 6778.43 346.88 1.940
17 77.30 6480.00 139.20 6451.14 253.67 6777.48 345.83 1.940
18 77.30 6480.00 139.20 6451.14 253.23 6776.53 344.79 1.940
19 77.30 6480.00 139.20 6451.14 252.79 6775.58 343.75 1.941
20 77.30 6480.00 139.20 6451.14 252.35 6774.63 342.71 1.941
21 77.30 6480.00 139.20 6451.14 251.90 6773.68 341.67 1.941
22 77.30 6480.00 139.20 6451.14 251.46 6772.73 340.62 1.941
23 77.30 6480.00 139.20 6451.14 251.02 6771.79 339.58 1.942
24 77.30 6480.00 139.20 6451.14 250.58 6770.84 338.54 1.942
25 77.30 6480.00 139.20 6451.14 250.13 6769.89 337.50 1.942
26 77.30 6480.00 141.46 6450.04 262.03 6791.90 362.50 1.947
27 77.30 6480.00 141.46 6450.04 261.58 6790.95 361.46 1.947
28 77.30 6480.00 141.46 6450.04 261.14 6790.00 360.42 1.947
29 77.30 6480.00 141.46 6450.04 260.70 6789.06 359.38 1.947
30 77.30 6480.00 141.46 6450.04 260.26 6788.11 358.33 1.948
31 77.30 6480.00 141.46 6450.04 259.81 6787.16 357.29 1.948
32 77.30 6480.00 141.46 6450.04 259.37 6786.21 356.25 1.948
33 77.30 6480.00 141.46 6450.04 258.93 6785.26 355.21 1.948
34 77.30 6480.00 141.46 6450.04 258.48 6784.31 354.17 1.949
Hayden Gravel Pit Lewicki&Associates
December 2022