REP06340

• Permit No: C1981033
• IBM Index Class Name: Report
• Doc Date: 4/22/1982
• Doc Name: 1982 STABILITY ANALYSIS OF PORTAL & ACCESS ROAD AREAS
• From: ROCKY MOUNTAIN GEOTECHNICAL
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

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SLOPG STABILITY SUDir1ARY SIIEET
BEAR MItiE N0. 3
Conditions Analyzed:
_
Colluvium - c = 360 psf, ~ =
23° (Peak strength)
Bedrock (other than massive sandstone) - c = 1150 psf ~ = 20° (Worst possible shear
strength condition for failure parallel to bedding planes in highly weath ered
clay shale)
Seepage condition - 4 ft. th ick seepage zone at bedrock/colluvium interface.
Marginally Minimum Critical Mode
Slope Stable Stable Unstable F.S. Circular Plane

Sec [ion A:
Existing condition:
Above portal area X 0.943 X
Below bench area X 0.803 X
Future condition:
20 ft. bench - above portal X 0.818 X
40 ft. bench - above portal X 0.826 X
40 ft. bench - below bench X 0.895 X
Section B:
Existing condition:
Above portal area X 1.033 X
Below bench area X 0.891 X
Future condition:
Above portal area X 1.042 X
Below bench area (reclaimed) X 0.893 X
Section C:
Existing condition:
Above portal area X 1.132 X
Below bench area X 1.264 X
Future condition:
Above portal area X 1.137 X
Below bench area (reclaimed) X 1.070 X
Section D:
Existing condition:
Above portal area X 1.237 X
Below bench area X 1.255 X
Future condition:
Above portal area X 1.280 X
Below bench area (reclaimed) X 1.243 X
Section E:
Existing condition:
Above haul road X 1.257 X
Below haul road X 1.235 X
Future condition:
Above haul road X 1.198 X
Below haul road X 1.182 X