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Laboratory test results indicate that the sample provided consisted of <br /> about 57 percent gravel (up to six inches in diameter) , 26 percent sand and 17 <br /> percent silt and clay fines. The fine fraction had a liquid limit of 25 and a <br /> plasticity index of 7. The maximum dry density (ASTM D-1557) of -the material <br /> was 136.5 pounds per cubic foot at an optimum moisture content of 6.5 percent. <br /> For permeability and triaxial testing purposes, soil samples were remolded <br /> to 95 percent of modified Proctor density. The remolded test samples had a <br /> nominal diameter of about three inches; therefore, the +1/2 inch aggregate was <br /> split from the samples and replaced with material ranging in size from 1/2 inch <br /> to 3/8 inch. Permeability test results generally ranged between 10-6 to 10-7 <br /> centimeters per second. Triaxial compression test results indicated the <br /> remolded sample had an effect internal angle of friction of 350 with zero <br /> cohesion. <br /> 5.2.2 Synthetic Strength Fabrics <br /> geometries and strengths <br /> In order to attain the toe berm g required various g <br /> methods of earth reinforcing were incorporated into our analysis. Generally, <br /> roller-compacted concrete, soil-cement stabilization, and synthetic strength <br /> fabrics were reviewed. Of the three, synthetic strength fabrics appeared to <br /> provide the most suitable technical and economic results. The strength fabrics <br /> used in analysis were the uniaxial polymer grid SR3 (UX1300) , and the biaxial <br /> polymer grid SS-1 (BX1100) . These products are produced by The Tensar Cor- <br /> poration located at 1210 Citizens Parkway, Morrow, Georgia 30260 (Telephone <br /> number 1-800-845-4453) . The tensile strength (in pounds per square foot) for <br /> these products as provided by Tensar is as follows: <br /> -29- <br />