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Mr. Mike Galloway <br />_~ June 17, 1991 <br />a Page 2 <br />b. Storage in an area north of Portal No. 2 and the coal storage pile. The <br />ground surface in this area originally sloped downward to the north at <br />approximately 15 percent, but has since been regraded into terraces. The <br />terraced area available for the refuse storage facility is approximately <br />2.3 acres (670 feet x 150 feet). <br />c. Facility consisting of a curbed, "V"-sloped, low-permeability pad which <br />will direct any drainage toward a sump. The facility will also have <br />diversion ditches on all sides. <br />d. Refuse will be conveyed to the facility by a stacker tube (from the air <br />quality emission permit). Refuse will be spread in lifts, compacted, and <br />shaped with side slopes of 2:1 or Tess (from the operation and reclamation <br />plans). Erosion control materials will be sprayed on the stored refuse <br />as necessary. <br />STORAGE FACILITY DESIGN <br />Using all of the available storage area (2.3 acres), the 15,000 cubic yards of <br />refuse would be approxlmately 4 feet deep. Spreading and compacting the refuse <br />into a thicker pile (8 to 12 feet deep) would result in a 1-acre storage area <br />(150 feet x 300 feet). <br />The space required for the facility would include an area for the conveyer <br />discharge and space for a dozer or other equipment to push the refuse from the <br />conveyed pile into the actual refuse pile. The facility will also need to <br />acconmodate removal of refuse. In order to provide sufficient space for <br />placement, removal, and storage of the refuse, an area of approximately 1.7 acres <br />(150 feet x 500 feet) is shown in Figure 1. <br />Based on soil descriptions in the area, it is anticipated that local clayey soils <br />can be used to construct the low-permeability base of the facility. These soils <br />(of suitable plasticity characteristics and fines content) would be placed in <br />lifts and compacted to typical liner specifications (such as 95 percent of <br />standard Proctor density and at optimum moisture content). <br />The base will be sloped toward the collection sump in a "V"-shaped manner. The <br />slope toward the center of the facility is one percent, and the slope of the <br />center of the facility toward the sump is one-half percent (shown in Figure 1). <br />A slotted PVC pipe should be placed above the base (beneath the gravel) along <br />the center of the facility and empty into the collection sump. <br />