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 10 most critical of all the failure surfaces examined
are displayed below - the most critical first
Failure surface No. 1 specified by 18 coordinate points
Point x-surf y-surf
No. (ft) (f t)
1 406.62 6425.14
2 436.48 6428.02
3 466.21 6431.99
4 495.79 6437.03
5 525.16 6443.13 r
6 554.29 6450.30
7 583.14 6458.51
8 611.68 6467.76
9 639.87 6478.04
10 667.66 6489.33
11 695.03 6501.62
12 721.93 6514.89
13 748.34 6529.13
14 774.21 6544.31
15 799.52 6560.42
16 824.23 6577.43
17 848.31 6595.33
18 854.14 6600.00
** Corrected JANBU FOS = 1.978 ** (Fo factor = 1.033)
Failure surface No. 2 specified by 17 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 413.74 6426.90
2 443.70 6428.50
3 473.55 6431.47
4 503.24 6435.81
5 532.69 6441.51
6 561.85 6448.55
7 590.66 6456.91
8 619.06 6466.60
9 646.98 6477.57
10 674.37 6489.81
11 701.17 6503.29
12 727.32 6517.99
13 752.77 6533.87
14 777.47 6550.90
15 801.36 6569.05
16 824.39 6588.27
17 837.21 6600.00
** Corrected JANBU FOS = 1.980 ** (Fo factor = 1.039)
Failure surface No. 3 specified by 18 coordinate points
Point x-sur' y-surf