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• affect the RDA stability. The material used should consist of sandstone and the <br />amount of clays or shales should be minimized. The locations should be rotated so <br />that continuous vertical layers are not created. The roads should also cover limited <br />areas. <br />Staging and Surface Grading <br />It is not necessary to construct the RDA in uniform lifts across the entire <br />working surface. The important factor is that adequate surface drainage for the <br />working area be maintained. As the pile increases in elevation the surface area will <br />increase and k may become more efficient to concentrate placement activities to <br />limited areas. This will also allow more effective management of the surface during <br />periods of inclement weather. If desired, portion(s) of the surface can be built up in <br />• lifts to heights up to 50 feet above other portions of the working surface. For these <br />area we recommend temporary slopes be on the order of 4:1 (H:~ or flatter. <br />The working surface of the RDA should be sloped to provide positive surface <br />drainage. We recommend minimum grades on the order of 3 to 5 percent or more <br />to the front and/or sides of the working surface. If inclement weather causes water <br />to pond on the surface, then drainage ditches should be excavated to drain the <br />surface prior to compaction and placement of additional fill. <br />Elimination of Fines from the Refuse <br />We understand R may be desired to eliminate the finer fraction of the refuse <br />(minus #28 mesh material) at some future date. We believe this will positively affect <br />• the RDA operation and stability. The coarser refuse should result in better drainage, <br />26 <br />