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

No. (f t) (ft)
1 399.49 6423.20
2 429.39 6425.55
3 459.18 6429.10
4 488.81 6433.83
5 518.22 6439.74
6 547.37 6446.83
7 576.22 6455.08
8 604.71 6464.47
9 632.80 6474.99
10 660.45 6486.63
11 687.61 6499.37
12 714.25 6513.18
13 740.30 6528.04
14 765.75 6543.94
15 790.53 6560.84
16 814.63 6578.72
17 837.98 6597.54
18 840.79 6600.00
** Corrected JANBU FOS = 1.981 **
r
(Fo factor = 1.036)
Failure surface No. 4 specified by 18 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 392.36 6420.69
2 422.32 6422.26
3 452.18 6425.11
4 481.90 6429.24
5 511.41 6434.63
6 540.66 6441.29
7 569.60 6449.18
8 598.18 6458.31
9 626.34 6468.66
10 654.03 6480.20
11 681.21 6492.91
12 707.81 6506.77
13 733.80 6521.76
14 759.12 6537.85
15 783.73 6555.01
16 807.58 6573.20
17 830.63 6592.40
18 839.00 6600.00
** Corrected JANSU FOS = 1.983 ** (Fo factor = 1.039)
Failure surface No. 5 specified by I9 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 378.10 6416.14
2 408.02 6418.31
3 437.85 6421.55
4 467.54 6425.85