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• (9) Ponds, Impoundments and Diversions <br />The Sediment and Surface Water Control Plans are shown on <br />Maps 13 and 14 for the East Portal and West Portal. WFC submitted <br />these plans as a technical revision to the permit. These revisions <br />have been necessary because of preparation plant construction, <br />refuse area construction and the need for more efficient routing of <br />disturbed water as well as ease of maintainence of the overall <br />drainage system. LThe area north of Ditches D11 and D19 to the <br />Highway 12 easement were graded, covered with subsoil and topsoil, <br />mulched and seeded during August and September of 1990. <br />Basin Resources has four sediment ponds which collect surface <br />disturbed runoff from the East Portal area. These ponds are 009, <br />005, 007, and 008. These sedimentation ponds and associated <br />diversion ditches have been designed according to Section 9.05.6 of <br />the OMLR Regulations. In addition, the diversion structures have <br />been designed utilizing the requirements of 9.05.3 and 4.05.4. <br />Typical sections of the emergency spillways and embankments of each <br />sediment control structure are shown in Figure 3, Typical <br />Embankment Cross Section. Typical diversion sections are provided <br />on Map 13, Sediment and Surface 'Rater Control Plan - East Portal. <br />Table 20, Ditch Data, is a summary of diverion (ditch) data <br />relating to Map 13. Table 21, Culvert Sizing and Table 22, Culvert <br />Sizing Nomograph, provide backup for culvert sizing as per <br />requested drainage modifications. Table 23, Sediment Pond <br />Dimensions, is a summary of sediment pond dimensions. <br />Basin Resources will control West Portal drainage using <br />ditches, containment areas and bypass culverts. All structures are <br />shown on Map 14, Sediment and Surface Water Control Plan - West <br />Portal, drainage basins are shown on Map 13A, Drainage Basin, and <br />. calculations are found in Exhibit 19, Sediment Design <br />Specifications. <br />2.05-9 (revised 8/29/97) <br />