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• near the end of the diversion channel to provide access across <br />the site to the west. The design for the dip-section, 4' CMP and <br />diversion channel is included in Exhibit 4B, Volume III. A por- <br />tion of Drawing D-4-16 is included with the calculations to show <br />the alignment of the channel. <br />Refuse Pile Terraces <br />The refuse pile has been designed to contain as much coal waste <br />as possible while keeping the areal extent of disturbance to a <br />minimum. The refuse pile has been analyzed from a geotechnical <br />standpoint and the pile is quite stable. <br />Due to the natural terrain, the placement of refuse would be <br />• prohibitive unless terraces are used. The terraces also decrease <br />soil erosion by allowing deposition to occur. <br />The refuse pile has been designed to comply with the performance <br />standards of section 4.14.2(2). The terrace benches are 20 feet <br />in width. The bench is insloped at an approximate 10 percent <br />slope. The design of the drainage ditches are shown on Drawing <br />D-4-12. Drawing D-4-9 shows the drainage pattern. The <br />velocities for the bench ditches are low enough not to cause ero- <br />sion of the refuse pile. Also, terrace relief energy dissipaters <br />are not required. Riprap will be utilized where slopes are steep <br />enough to produce erodible velocities. <br />• 4-50a (Revised 6-20-88) <br />