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TRUENVIRONMENTAL, INC. <br />AEOEWrtm-%, 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: 05/17/2010-05/21/2010 <br />Tested Interface: Colorado Lining 200 mil 6 oz. Double-sided Geocomposite vs."Slimes" <br />Tailings <br />Shear Stress vs. Normal Stress <br />14000 _ _ <br />Peak Shear Stress (Linear Fit) <br />Large Displacement Shear Stress (Linear Fit) <br />12000 <br />H 10000 <br />a <br />in 8000 <br />? sooo <br />w <br />in 4000 <br />2000 <br />e <br />0- <br />0 2000 4000 6000 8000 10000 12000 14000 16000 <br />Normal Stress (psf) <br />8000 <br />7000 <br />Shear Stress vs. Displacement <br />1000 psf -7500 psf A 15000 psf <br />N 6000 <br />a <br />in 5000 <br />d <br />w 4000 <br />w <br />y 3000 <br />L <br />N <br />2000 <br />• <br />sooo , <br />f'[ 111 ?. t1?. .. ..,, 1..1 .. .. t., .f ..... <br />0 + - - - --------- <br />0.0 1.0 2.0 3.0 <br />Displacement (inches) <br />Test Resu lts <br /> Large <br /> Peak Displacement <br /> <br />Friction Angle <br />(degrees): 23.2 23.3 <br />Y-intercept or <br />Adhesion (psf): 592 454 <br />Test Conditions <br />(Upper Box & "Slimes" Tailings remolded to 99.1 pcf at <br />11.4% 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 />Test Condition: Wet <br />Shearing 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 (pst) 1000 7500 15000 <br />Corrected Peak Shear Stress (psf) 679 4449 6734 <br />Corrected Large Displacement Shear Stress (psf) 666 4094 6728 <br />Peak Secant Angle (degrees) 34.2 30.7 24.2 <br />Large Displacement Secant Angle (degrees) 33.7 28.6 24.2 <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