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TRUENVIRONMENTAL, INC. <br />A Texas Research International Company <br />• Interface Friction Test Report <br />Client: Venture Resources TRI Log#: E2337-21-02 John M. Allen, P.E., 05/21/2010 <br />Project: Hukill Gulch Millsite Test Method: ASTM D 5321 Quality Review/Date <br />Test Date: 05/18/2010-05/21/2010 <br />Tested Interface: Colorado Lining 200 mil 6 oz. Double-sided Geocomposite vs."Coarse <br />Fraction" Tailings <br />14000 <br />12000 <br />H 10000 <br />a <br />N 8000 <br />N 6000 <br />i <br />a <br />N 4000 <br />2000 <br />0 <br />0 <br />10000 <br />9000 <br />8000 <br />c <br />a loon <br />y 6000 <br />d <br />« 5000 <br />07 <br />4000 <br />y 3000 <br />2000 <br />1000 <br />Shear Stress vs. Normal Stress <br />Peak Shear Stress (Linear Fit) <br />Large Displacement Shear Stress (Linear Fit) <br />2000 4000 6000 8000 10000 12000 14000 16000 <br />Normal Stress (psf) <br />Shear Stress vs. Displacement <br />Q 1000 psf -7500 pt p 15000 psf <br />0 <br />0.0 <br />1.0 2.0 <br />Displacement (inches) <br />Test Resu lts <br /> Large <br /> Peak Displacement <br /> (3.0 in.) <br />Friction Angle <br />(degrees): 31.2 27.0 <br />Y-intercept or <br />Adhesion (psf): 201 0 <br />I Test Conditions I <br />Upper Box & "Coarse Fraction" Tailings remolded to <br />103.6 pcf at 16.1 % moisture content <br />Lower Box Colorado Lining 200 mil 6 oz double- <br />sided geocomposite <br />Box Dimensions: 12"x12"x4" <br />Interface Interface inundated with water and <br />Conditioning: loading applied for a minimum of 16 <br />hours prior to shear. <br />3.0 1 Test Condition: Wet <br />Rate: 0.4 inches/minute <br />Test D ata <br />Specimen No. 1 2 3 <br />Bearing Slide Resistance (Ibs) 18 79 151 <br />Normal Stress (psf) 1000 7500 15000 <br />Corrected Peak Shear Stress (psf) 814 4736 9301 <br />Corrected Large Displacement Shear Stress (psf) 666 3516 7784 <br />Peak Secant Angle (degrees) 39.2 32.3 31.8 <br />Large Displacement Secant Angle (degrees) 33.7 25.1 27.4 <br />• The testing herein is based upon accepted industry practice as well as the test method listed. Test results reported herein do not apply <br />to samples other than those tested. TRI neither accepts responsibility for nor makes claim as to the final use and purpose of the material. <br />TRI observes and maintains client confidentiality. TRI limits reproduction of this report, except in full, without prior approval of TRI. <br />9063 Bee Caves Road ? Austin, TX 78733-6201 ? (512) 263-2101 ? (512) 263-2558 ? 1-800-880-TEST