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2.2 GENERAL EARTHFILL <br /> A. General Earthfill material shall be used where indicated on the Construction <br /> Drawings and for the construction of termination berms, road berms, and backfill <br /> of anchor trenches and to bring subgrade to required grade where no other <br /> material is specified. The material shall be obtained from onsite excavations or <br /> stockpiles and shall be free from roots, organic matter, trash, debris, rocks or <br /> clods larger than 3 inches, and other deleterious materials. <br /> 2.3 SUBGRADE FILL <br /> A. Subgrade fill material shall be used at the locations shown on the Construction <br /> Drawings. The material shall be obtained from onsite excavations or stockpiled <br /> soil and shall be free from roots, organic matter, trash, debris, rocks or clods <br /> larger than 3 inches, and other deleterious materials. <br /> B. The top 3-inches of subgrade fill shall not contain particles greater than 1/2-inch <br /> or any materials that may protude from the surface that could puncture the <br /> overlying geosynthetics. <br /> 2.4 CLAY LINER <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 liner material shall be obtained from an onsite borrow source. <br /> B. The Clay Liner material shall have a soil classification of clayey sand (SC), lean <br /> clay, sandy clay, or silty clay (CL), or fat clay or sandy clay (CH), using the <br /> Unified Soil Classification System and shall meet the following 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: 20 minimum to 60 maximum. <br /> 3. Plasticity Index: 10 to 40. <br /> 4. Field Hydraulic Conductivity: Maximum hydraulic conductivity of 1 x 10-� <br /> cm/sec measured using a sealed double ring infiltrometer (SDRI). An SDRI <br /> for the clay liner material has been performed and the results are included in <br /> Exhibit A. <br /> 5. Laboratory Hydraulic Conductivity: Correlate to maximum field hydraulic <br /> conductivity (see Exhibit A) when compacted to a relative compaction of <br /> 90 percent at a water content of 3 to 8 percent greater than the optimum <br /> water content per ASTM D1557, and permeated with water, as measured <br /> using a standard triaxial permeability test method ASTM D5084-90. <br /> Forward Landfill WMU FU-04 <br /> 02300 5 EARTHWORK <br />