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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 anchor and termination berms and to bring <br /> subgrade to required grade where no other material is specified. The material <br /> shall be obtained from onsite excavations or stockpiles and shall be free from <br /> roots, organic matter, trash, debris, rocks or clods larger than 3 inches, and other <br /> deleterious materials. <br /> B. The top 3-inches of General Earthfill that will be overlain by geosynthetics shall <br /> not contain particles greater than 1/2-inch or any materials that may protude from <br /> the surface that could puncture the overlying geosynthetics. <br /> 2.3 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. <br /> B. The EARTHWORK CONTRACTOR shall selectively excavate suitable clay liner <br /> material from the onsite borrow sources. The clay liner material shall be first <br /> obtained from the eastern onsite borrow source until a sufficient amount of <br /> material has been obtained or there is no suitable clay liner material remaining. <br /> Clay liner material shall then be obtained from the northern onsite borrow source. <br /> C. The Clay Liner material shall have similar characteristics to the clay material used <br /> in the sealed double ring infiltrometer testing (see OWNER for SDRI test results). <br /> It shall have a soil classification of clayey sand (SC), lean clay, sandy clay, or <br /> silty clay (CL), or fat clay or sandy clay (CH), using the Unified Soil <br /> 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: 25 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 may be <br /> obtained from the OWNER. <br /> 5. Laboratory Hydraulic Conductivity: Maximum hydraulic conductivity of <br /> 3.1 x 10"8 cm/sec (based on correlation to maximum field hydraulic <br /> conductivity; see existing SDRI test results). <br /> Forward Landfill WMU FU-14 <br /> 02300 5 EARTHWORK <br />