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<br />demonstrated not to slake in water or degrade to soil material and will be free of <br />coal, clay and other non-durable material." <br /> <br />CONSTRUCTION RECOMMENDATIONS <br />Initial Construction and Phasing <br />Due to the long, narrow configuration of the revised RDA, we believe the most <br />~ • <br />• <br />efficient method will be to construct the pile in segments from north to south. The <br />length of the segments can be varied depending on expected production of waste. <br />Detail 7 on (Fig. 5) illustrates construction of an initial northern segment about 1,000 <br />feet long to full height, and then constructing the next segment to the south. While <br />the first segment is being constructed, the area below the next segment can be <br />stripped and prepared for waste placement. Detail 9 (Fig. 5) shows a suggested <br />procedure for vertical construction of the RDA and cover. Detail 10 shows the <br />estimated volume by station along an approximate north-south axis through the RDA. <br />Stripping of topsoil, excavation of cover material, excavation of the toe <br />buttress and drain installation should be performed prior to placement of coal waste. <br />The excavation for topsoil and cover material can be done in stages as the pile <br />elevation increases, or can be done for the entire segment if desired. <br />The ridge to the west of the revised RDA, and constructing the pile in <br />segments, will limit the drainage area uphill of the pile during construction to a <br />comparatively small area. We do not believe continuous use of temporary diversion <br />ditches will be required to protect segments of the coal waste pile as they are being <br />constructed. We recommend small, temporary diversion ditches be used to <br />19 <br />