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A4- i?, 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. 04/01/2010 <br />Project: Hukill Gulch Millsite Test Method: ASTM D 6243 Quality Review/Date <br />Test Date: 03/31/2010-04/01/2010 <br />Tested Interface: Bentomat DN GCL (3381) vs. 60 mil Textured HDPE Geomembrane <br />14000 <br />12000 <br />N 10000 - <br />a <br />N 8000 <br />'n 6000 <br />v <br />4000 <br />2000 <br />0 <br />0 <br />Shear Stress vs. Normal Stress <br />Peak Shear Stress (Linear Fit) <br />- - - Large Displacement Shear Stress (Linear Fit) <br /> <br />Test Resu lts <br /> Large <br /> Peak Displacement <br /> ( 3.0 in.) <br />Friction Angle <br />(degrees): 26.6 14.4 <br />Y-intercept or <br />Adhesion (psf): 165 218 <br />2000 4000 6000 8000 10000 12000 14000 16000 <br />Normal Stress (psf) <br />Shear Stress vs. Displacement <br />' 9000 <br />8000 <br />7000 <br />A 6000 <br />N <br />y 5000 <br />4000 <br />R <br />= 3000 <br />to <br />2000 <br />1000 <br />0 <br />0.0 <br />- 1000 psf -7500 psf A15000 psf <br />• <br />Lower Box 60 mil Textured HDPE Geomembrane <br />Test Conditions I <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 />Upper Box Bentomat DN GCL (black side) <br />Test Condition: Wet <br />Shearing Rate: 0.04 inches/minute <br />Test D ata <br />Specimen No. 1 2 3 <br />Bearing Slide Resistance (lbs) 18 79 151 <br />Normal Stress (psf) 1000 7500 15000 <br />Corrected Peak Shear Stress (psf) 663 3921 7669 <br />Corrected Large Displacement Shear Stress (psf) 429 2232 4033 <br />Peak Secant Angle (degrees) 33.5 27.6 27.1 <br />Large Displacement Secant Angle (degrees) 23.2 16.6 15.0 <br />Asperity (mils) 31.0 28.4 23.4 <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 0 (512) 263-2101 ? (512) 263-2558 ? 1-800-880-TEST <br />1.0 2.0 3.0 <br />Displacement (inches)