Laserfiche WebLink
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 /> ZAPROJECTS\Allied Waste\Forward\Reference Files Prior JTDUune 05 Stage IA Partial FCPCMP\FL-sec3.doc:6/16/2008 <br />