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TRIAXIAL TEST ASTM: D 4767 Job No. 7110 <br />Date: 8/14/09 <br />Project: West Elk Mine RPE Expansion - #06261003 <br />Boring #: B-6 Sample #: Type: 3T Depth (ft): 11.5-13.5 <br />Soil Type: Sandy Silt w/a trace of gravel (ML) <br />1.2 <br />1 <br />n <br />V <br />0.8 <br />5 <br />w 0.6 <br />P <br />a <br />m 0.4 <br />0 <br />d <br />0.2 <br />0 <br />3 <br />2.5 <br />w <br />2 <br />N <br />N <br />N1.5 <br />0 1 <br />00.5 <br />0 <br />3.5 <br />3.0 <br />s <br />a 2.5 <br />0 2.0 <br />i!f <br />1.5 <br />1.0 + <br />0 <br />3 <br />w <br />S2 <br />N <br />N <br />m <br />(n <br />d 1 <br />t <br />(n <br />0i <br />0 <br />5 10 15 <br />Axial Strain (%) <br />1 2 3 4 <br />Normal Stress (p') (tsf) <br />Rupture Envelope at Failure <br />a = 24.8 ° a = 0.0 (tsf) <br />9301 Bryant Ave. South Suite #107 <br />Failure Criterion: Max. Deviator Stress <br />Angle of internal friction, 0' = 27.50 <br />Apparent Cohesion, c'= 0.00 (tsf) <br />Test Date: 7/31/09 Liquid Limit: 36.9 <br />Test Type: CU w/pp Plastic Limit: 16.0 <br />Strain Rate (in/min): 0.0146 Plasticity Index: 20.9 <br />Strain Rate (%/min): 0.501 Spec. Gravity (Assumed): 2.68 <br />Before Consolidation A B C D <br />Diameter (in) 1.45 <br />Height (in) 2.95 <br />Water Content (%) 17.5 <br />■ Dry Density (pcf) 109.4 <br />Void Ratio 0.53 <br />Remarks: Radial drainage strips applied to trimmed specimen; Saturated, backpressured <br />until "B" response was 0.95 to 1.00; Consolidated; All Drainage valves closed and <br />immediatelv sheared. <br />20 <br />4 <br />After Consolidation <br />3 <br />Diameter (in) <br />1.42 <br />Height (in) <br />2.91 <br />Water Content (%) <br />17.1 <br />Dry Density (pcf) <br />114.7 <br />Void Ratio <br />0.46 <br />Back Pressure (tsf) <br />5.8 <br />Minor Principal Stress (tsf) <br />2.00 <br />0 <br />Max. Deviator Stress (tsf) <br />2.55 <br />Ultimate Deviator Stress (tsf) <br />2.55 <br />+ <br />Deviator Stress at Failure (tsf) <br />2.55 <br />Max. Pore Pressure Buildup (tsf) <br />0.97 <br />Pore Pressure Parameter "B" <br />1.0 <br />Pct. Axial Strain at Failure <br />25.01 EJ <br />"These test results are for informational purposes only and must be reviewed by a <br />qualified professional engineer to <br />verify that the test parameters shown are <br />X <br />appropriate for <br />any particular design" <br />Remarks: Radial drainage strips applied to trimmed specimen; Saturated, backpressured <br />until "B" response was 0.95 to 1.00; Consolidated; All Drainage valves closed and <br />immediatelv sheared. <br />20 <br />4 <br />3 <br />2 <br />1 <br />0 <br />5 0 1 2 3 4 5 6 7 <br />Normal Stress (tsf) <br />-- Effective 0': 27.50 c'= 0.00 (tsf) <br />Total 0': 22.9 ° c= 0.00 (tsf) <br />OIL <br />NGINEERING Bloomington, Minnesota 55420-3436 <br />ESTING, INC. <br />8 <br />