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0 Foundation Layer <br />The one -foot foundation layer will be comprised of random onsite soils which <br />constitute the in-place interim cover. The in-place material (approximately <br />one foot), utilized as part of the foundation layer, will be scarified and <br />compacted to the maximum density obtainable at optimum moisture using <br />methods that are in accordance with accepted engineering standards. Prior <br />to implementation of closure construction, an evaluation of the existing depth <br />of cover will be conducted. Additional cover material will be placed over the <br />existing cover at closure to achieve the desired foundation layer depth <br />(minimum one foot) and grades for the final cover. <br />Monolithic Soil Final Cover <br />The proposed monolithic layer will be constructed with soils obtained from on <br />site borrow sources. Prior to placement, these materials will be moisture <br />conditioned to approximately optimum moisture content and thoroughly mixed <br />to obtain a near uniform condition. The material will then be placed in lifts <br />with a maximum uncompacted thickness of six to eight inches. Each lift will <br />be spread evenly and compacted to a minimum of 90 percent of the <br />maximum dry density as determined by ASTM D1557. <br />Where quality control tests indicate that the moisture content, density, <br />saturated hydraulic conductivity or grain size distribution of any lift, or portion <br />thereof, does not meet the specifications in Appendix C of Appendix A, that <br />particular portion shall be retested and, if necessary, reworked until the <br />specified moisture, density, and saturated hydraulic conductivity have been <br />attained. No additional material will be placed over an area until the <br />previously placed material has been tested and found to meet the design <br />specifications. Testing of the materials will be done in accordance with the <br />CQA Plan included in Appendix C of Appendix A. <br />Vegetation <br />Moisture control through evaporation and/or transpiration of selected plants is the <br />principal infiltration controlling mechanism in a monofill alternative final cover <br />design. Vegetative cover plant species, if appropriate, will include native seasonal <br />grasses and shrubs. The selected plant types will provide a good soil root <br />Forward Landfill PFCPCMP 3-5 <br />Z:\PROJECTS\Allied Waste\Forward\Reference Files Prior JTD\June 05 Stage IA Partial FCPCMP\FL-sec3.doc: 6/16/2008 <br />