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TRI/ENVIRONMENTAL, INC. <br /> A Texas Research International Company <br /> HOLDREGE & KULL INTERFACE FRICTION TEST <br /> Clay Soil vs. Single-Sided Textured Geomembrane vs. Drainage Rock <br /> 8000 <br /> 7000 <br /> 6000 <br /> 5000 <br /> 4000 , <br /> 3000 <br /> W <br /> 2000 <br /> 1000 <br /> 0 <br /> 0,0 1.0 2.0 3.0 4.0 <br /> Displacement (inches) <br /> TRI Log No. E2128-56-09 O 1000 psf O 3000 psf A 5000 psf O 8000 psf o 15000 psf 1 <br /> 9063 Bee Caves Road Austin,TX 70733-6201 (512)263-2101 FAX(512)263-2558 1-800-880-TEST <br />