2010-04-26_PERMIT FILE - C1980007A ‎(7)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 4/26/2010
• Doc Name: Laboratory Test Data
• Section_Exhibit Name: Exhibit 82 Appendix B
• Media Type: D
• Archive: Yes

4
4
Residual Shear Test Job No.: 7110
Project: West Elk Mine RPE Expansion - #06261003
oring No.: B -6 Sample No. Depth: 34.5 -36.5 Test Date: 8/18/2009
ocation: Sample Type: Core Date Reported: 9/8/2009
Soil Type: Fat Clay (CH) Shear Rate
0.0009 (in /min)
Remarks: Sample ground down through the #200 sieve and sand and gravel removed. Specimens were
incrementally loaded to given pressures. Specimens were then sheared to determine a peak shear value.
Liquid Limit:
51.1
Specimen were then shear several time until readings were consistent to develope a residual shear strength.
Plastic Limit:
19.3
Plasticity Index:
31.8
Specific Gravity:
2.72
4
Failure Criterion:
Residual Stress A B C D
3.5
Initial O X
Diameter Lin.1 2.51 2.51 2.51
3
Thickness (In.) 0.91 0.79 0.79
Water Content ( %) 64.0 64.0 64.0
N
Dry Density (pcf) 61.7 61.7 61.7
t2.5
Before Shear
N
Thickness (In.l 0.68 0.53 0.51
rn 2
Water Content ( %) 39.1 31.6 28.3
a
Dry Density (pcf) 82.3 91.3 96.0
t
rn
Normal Stress 1.00 2.00 4.00
1.5
Max Shear Stress 0.56 1.04 1.82
Residual Shear Stress 0.31 0.41 0.65
1
"These tests are for informational purposes only and must be reviewed by a
qualified professional engineer to verify that the test parameters shown are
appropriate for any particular design."
0.5
Residual Residual
Friction Angle: q= 22.2 deg. Friction Angle: 6.5 deg.
0 i
Apparent 0.19 TSF Apparent 0.18 TSF
i
0
0.5
1
1.5
2 2.5
3
3.5
4
4.5 Cohesion Cohesion
2
Normal
Stress
(TSF)
1.75
(
\,
1.5
LL,1.25
N
t✓
to
1
a�i
L
N
L
200.75
7
0.5
000
000
0.25
'
0
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75
Shear Displacement (inch)
9301 Bryant Ave. South Suite 107 Minnesota 55420 -3436
NQ. L\ C.