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KLEINFELDER <br /> 6 CONSTRUCTION <br /> 6.1 TEST PAD <br /> The test pad was constructed in April, 1993. Results of the test pad and construction methods <br /> are presented in Appendix D. <br /> 6.2 CONSTRUCTION OF THE FINAL COVER <br /> 6.2.1 Foundation Layer <br /> The foundation layer fill shall be on or off site materials meeting the requirements of Chapter <br /> 15, and shall be placed in lifts not exceeding 8 inches in loose depth. The completed <br /> foundation layer shall be not less than 2-feet thick. Compaction of the lower foot shall be to <br /> the maximum practical based on optimum moisture content. The upper foot of the foundation <br /> layer shall be compacted to at least 90 percent of minimum dry density as defined by ASTM <br /> D 1557. Where the lower one foot of the foundation layer is already in place as temporary <br /> cover, it may be compacted in place to the maximum practical density. <br /> 6.2.2 Barrier Layer <br /> The low permeability barrier layer shall be constructed on a foundation layer that has been <br /> compacted to provide a uniform firm surface. The low permeability barrier layer shall be <br /> constructed as follows: <br /> A. Onsite selected soil shall be placed on the finished foundation layer. <br /> B. Onsite selected soil shall be spread over the finished foundation layer in a single loose <br /> layer of approximately 13 inches. (The 13-inch thickness may be adjusted to allow for a <br /> final compacted barrier layer of 12.5 inches minimum). <br /> C. The 20 percent imported Ione clay (by dry weight) shall be spread evenly over the <br /> uncompacted 13-inch loose lift. This should give an uncompacted clay depth of <br /> approximately 3 inches. <br /> As a guide for determining necessary quantities of Ione clay, a 500-foot by 500-foot <br /> square area will require approximately 3,500 tons. This figure is based on 20 to 22 <br /> percent moisture content for Ione clay, 115 pounds per cubic foot inplace dry density <br /> each, a minimum 12-inches compacted thickness. Modifications to the spread rate may <br /> be necessary during construction depending on changes in these parameters. <br /> The 20 percent imported Ione clay (by dry weight) shall be spread evenly over the <br /> uncompacted 13-inch loose lift. This should give an uncompacted clay depth of <br /> approximately 3 inches. <br /> The contractor shall not begin premixing until the Engineer has approved the spreading <br /> of Ione clay. <br /> GSM.md 3EI94 Page 16 of 24 <br /> Copyright 1994 Kleinfelder, Inc. Act <br />