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the optimum water content per ASTM D1557, and permeated with water, as <br /> measured using a standard triaxial permeability test method ASTM D5084- <br /> 90. <br /> 2.5 CLAY PLUG AND CLAY EARTHFILL MATERIAL <br /> A. A natural clayey material free from roots, organic matter, frozen material, debris, <br /> solid waste, rocks, or slag larger than 1 inch, and other deleterious materials. The <br /> clay plug and clay earthfill material shall be obtained from an onsite borrow <br /> source. <br /> B. The EARTHWORK CONTRACTOR shall selectively excavate suitable clay plug <br /> and clay earthfill material from the onsite borrow source. The EARTHWORK <br /> CONTRACTOR shall provide personnel capable of identifying soils suitable for <br /> the clay plug. <br /> B. The clay plug and clay earthfill material shall have a soil classification of clayey <br /> sand (SC), lean clay, sandy clay, or silty clay (CL), or fat clay or sandy clay (CH), <br /> using the Unified Soil Classification System and shall meet the following <br /> requirements: <br /> 1. Particle Size: Material having 100 percent by weight passing 1-inch sieve, <br /> 90 percent by weight passing U.S. No. 4 sieve and at least 60 percent by <br /> weight passing U.S. No. 200 sieve. The maximum in-place dry clod size <br /> shall be 1 inch. <br /> 2. Liquid Limit: 25 minimum to 60 maximum. <br /> 3. Plasticity Index: 10 to 40. <br /> 2.6 GRANULAR DRAINAGE MATERIAL <br /> A. Granular Drainage Material (GDM): Clean, washed, well-rounded, hard, durable <br /> sandy gravel free from foreign materials. Material shall have a maximum particle <br /> size of 3/8 inch and shall have less than 3 percent passing the No. 200 sieve. The <br /> minimum hydraulic conductivity to water shall be 0.1 cm/sec. <br /> B. GDM shall contain no limestone or other material that will adversely react with <br /> leachate. <br /> C. The GDM shall be provided by the EARTHWORK CONTRACTOR. <br /> 2.7 COARSE GRAVEL <br /> A. Clean,washed, well-rounded,hard, durable gravel free from dirt, clay clods,roots, <br /> and other foreign materials. Material shall conform to the following washed sieve <br /> gradation as determined by ASTM C117 and C136: <br /> Sieve Size Percent Passing by Weight <br /> Forward Landfill WMU FU-08 <br /> 02300 6 EARTHWORK <br />