REV06840

• Permit No: C1980007
• IBM Index Class Name: Revision
• Doc Date: 11/30/1995
• Doc Name: FACTOR OF SAFETY SUMMATION FOR THE PARKING LOT EXTENSION AT THE WEST ELK MINE
• From: HARDING LAWSON ASSOCIATES
• To: MTN COAL CO
• Type & Sequence: MR174
• Media Type: D
• Archive: No

20 248.35 159.64
21 249.14 160.91
Circle Center At X = 138.2 Y = 234.2 and Radius, 133.0
*** 1.470 ***
1
Failure Surface Specified By 22 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 60.00 110.00
2 68.73 105.12
3 77.82 100.95
4 87.21 97.53
5 96.86 94.87
6 106.68 93.00
7 116.62 91.92
8 126.62 91.65
9 136.60 92.18
10 146.51 93.51
11 156.29 95.64
12 165.85 98.54
13 175.16 102.20
14 184.14 106.60
15 192.74 111.70
16 200.90 117.49
17 208.57 123.90
18 215.70 130.92
19 222.24 138.48
20 228.15 146.54
21 233.40 155.06
22 234.73 157.67
Circle Center At X = 125.0 Y = 216.0 and Radius, 124.3
*** 1.471 ***
Failure Surface Specified By 20 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 86.67 116.11
2 95.58 111.57
3 104.84 107.80
4 114.38 104.81
5 124.14 102.63
6 134.05 101.28
7 144.04 100.76