REV04523

• Permit No: C1980007
• IBM Index Class Name: Revision
• Doc Date: 11/21/1996
• Doc Name: SYLVESTER GULCH STABILITY ANALYSIS FOR RECLAMATION
• From: GOLDER ASSOCIATES
• To: MOUNTAIN COAL CO
• Type & Sequence: PR7
• Media Type: D
• Archive: No

The most critical circular failure surface
is specified by 26 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 234.10 6746.76
2 246.09 6747.31
3 258.05 6748.23
4 269.98 6749.53
5 281.87 6751.19
6 293.69 6753.23
7 305.45 6755.64
8 317.13 6758.41
9 328.71 6761.54
10 340.19 6765.04
11 351.55 6768.89
12 362.79 6773.09
13 373.90 6777.64
14 384.85 6782.54
15 395.65 6787.78
16 406.28 6793.35
17 416.73 6799.25
18 426.99 6805.47
19 437.05 6812.01
20 446.90 6818.86
21 456.54 6826.01
22 465.94 6833.46
23 475.11 6841.21
24 484.03 6849.23
25 492.70 6857.53
26 497.77 6862.69
**** Simplified BISHOP FOS = 2.017 ****
r'
The following is a summary of the TEN most critical surfaces
Problem Description SYLVESTER GULCH - Sed Pond Sec H-H
FOS Circle Center Radius Initial Terminal Resisting
(BISHOP) x-coord y-coord x-coord x-coord Moment
(ft} (ft) (ft) (f t) (ft) (ft-lb)
1. 2.017 222.48 7131.37 384.78 234.10 497.77 1.799E+OS
2. 2.018 241.42 7085.94 340.54 231.28 499.57 1.911E+08
3. 2.021 243.69 7079.69 334.37 231.28 498.75 1.902E+08
4. 2.024 230.76 7100.87 354.13 234.10 482.08 1.634E+08
5. 2.024 246.27 7077.52 330.99 234.10 498.64 1.841E+OS
6. 2.024 235.67 7101.75 353.79 236.92 493.73 1.704E+OS
7. 2.026 225.20 7119.38 371.60 236.92 484.05 1.602E+08
8. 2.026 222.82 7126.84 379.14 236.92 487.40 1.532E+08
9. 2.027 244.89 7077.20 330.62 234.10 494.38 1.784E+08
10. 2.028 202.14 7152.02 407.52 231.28 472.21 1.534E+08