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4 ? TRUENVIRONMENTAL, INC. Ilk, A Texas Research International Company <br />• Interface Friction Test Report <br />Client: Venture Resources TRI Log#: E2337-21-02 John M. Allen, P.E, 04/30/2010 <br />Project: Hukill Gulch Millsite Test Method: ASTM D 6243 Quality Review/Date <br />Test Date: 04/27/2010-04/30/2010 <br />Tested Interface: Bentomat DN GCL (3381) vs. Subgrade Soil <br />Shear Stress vs. Normal Stress <br />20000 _ _ <br />Peak Shear Stress (Linear Fit) <br />Large Displacement Shear Stress (Linear Fit) <br />C 15000 <br />N <br />Q <br />N <br />N <br />10000 <br />in <br />d <br />s <br />rn 5000 <br />0 ?- + - <br />0 5000 10000 15000 20000 <br />Normal Stress (psf) <br />' 9000 <br />8000 <br />7000 <br />H <br />a 6000 <br />N <br />y 5000 <br />N 4000 <br />R <br />r 3000 <br />N <br />2000 <br />1000 <br />0 <br />0.0 <br />• <br />Shear Stress vs. Displacement <br />Test Resu lts <br /> Large <br /> Peak Displacement <br /> (A 3.0 in.) <br />Friction Angle <br />(degrees): 23.6 8.0 <br />Y-intercept or <br />Adhesion (psf): 980 1482 <br />Note: Regression angles include an area <br />correction. GCL sheared internally under the <br />7500 and 15000 psf loads. <br />Test Conditions I <br />Upper Box & Bentomat DN GCL (white side) <br />Lower Box Subgrade Soil remolded to 112.3 pcf at <br />11.4% moisture content <br />Box Dimensions: 12"x12"x4" <br />Interface <br />Conditioning: Interface soaked and loading applied for <br />a minimum of 24 hours prior to shear. <br />est 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 />Area Corrected Normal Stress (psf) 1316 8659 16518 <br />Area Corrected Peak Shear Stress (psf} 1625 4617 8247 <br />Area Corrected Large Displacement Normal Stress (psf) 1334 9954 19958 <br />Area Corrected Large Displacement Shear Stress (psf) 1620 2979 4253 <br />Peak Secant Angle (degrees) 51.0 28.1 26.5 <br />Large Displacement Secant Angle (degrees) 50.5 16.7 12.0 <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 <br />1.0 2.0 3.0 4.0 <br />Displacement (inches)