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2.2 GENERAL EARTHFILL ® A. General Earthfill material shall be used where indicated on the Construction Drawings and for the construction of anchor and termination berms and backfill of anchor trenches and to bring subgrade to required grade where no other material is specified. The material shall be obtained from onsite excavations or stockpiles and shall be free from roots, organic matter, trash, debris, rocks or clods larger than 3 inches, and other deleterious materials. B. The top 3-inches of General Earthfill that will be overlain by geosynthetics shall not contain particles greater than 1/2-inch or any materials that may protude from the surface that could puncture the overlying geosynthetics. 2.3 SUBGRADE FILL A. Subgrade fill material shall be used at the locations shown on the Construction Drawings. The material shall be obtained from onsite excavations or stockpiled soil and shall be free from roots, organic matter, trash, debris, rocks or clods larger than 3 inches, and other deleterious materials. B. The top 3-inches of subgrade fill shall not contain particles greater than 1/2-inch or any materials that may protude from the surface that could puncture the overlying geosynthetics. 2.4 CLAY LINER A. A natural clayey material free from roots, organic matter, frozen material, debris, solid waste, rocks, or slag larger than 1 inch, and other deleterious materials. B. The clay liner material shall be obtained from the onsite borrow source. The EARTHWORK CONTRACTOR shall selectively excavate suitable clay liner material from the onsite borrow source. C. The Clay Liner material shall have similar characteristics to the clay material used in the sealed double ring infiltrometer testing (see OWNER for SDRI test results). It L shall have a soil classification of clayey sand (SC), lean clay, sandy clay, or silty clay (CL), or fat clay or sandy clay (CH), using the Unified Soil Classification System and shall meet the following requirements: 1. Particle Size: Material having 100 percent by weight passing 1-inch sieve, 90 percent by weight passing U.S. No. 4 sieve and at least 60 percent by weight passing U.S. No. 200 sieve. The maximum in-place dry clod size shall be 1 inch. 2. Liquid Limit: 25 minimum to 60 maximum. 3. Plasticity Index: 10 to 40. ® 4. Field Hydraulic Conductivity: Maximum hydraulic conductivity of 1 x 10 cm/sec measured using a sealed double ring infiltrometer(SDRI). An SDRI for the clay liner material has been performed and the results may be Forward Landfill WMU FU-13 02300 5 EARTHWORK