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

ERROR # 30
The angle specified as the LOWER angular limit for surface generation
is larger than the angle specified as the UPPER limit. This is not
correct. Please check the data for a possible reversal of these
values before retrying the analysis.
w,t*a,t***********,t,t,t*,t,r,t**,t,t*,t,t***,t*a,t**,t******,t,t**,t,t***,t,t**fe,t+,t*,t*,t,t,t,t*•
**,t*,t*******,r,t,t**,t,t*,t,t*****,t*,t**,t***,t**,t ,r**,t ,t*,r***
*** The above error occurred in attempting ***
*** to generate surface # 23 from the ***
*** initiation point located at x = 146.15 ***
Factors of safety have been calculated by the
* * * * * SIMPLIFIED BISHOP METHOD * * * *
The most critical circular failure surface
is specified by 25 coordinate points
Point x-surf y-surf
No. (f t) (ft)
1 133.33 6400.61
2 158.29 6399.21
3 183.29 6398.89
4 208.28 6399.68
5 233.21 6401.55
6 258.03 6404.51
7 282.70 6408.55
8 307.18 6413.67
9 331.40 6419.85
10 355.33 6427.09
11 378.92 6435.36
12 402.13 6444.66
13 424.91 6454.96
14 447.21 6466.25
15 469.00 6478.50
16 490.24 6491.70
17 510.88 6505.80
18 530.88 6520.80
19 550.21 6536.66
20 568.82 6553.35
21 586.69 6570.83
22 603.78 6589.08
23 620.05 6608.06
24 635.48 6627.73
25 648.37 6645.74