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(4) Ponds, Impoundments and lliversions <br />• The Sediment and Surface Water Control Plans are shown on Maps 13 and 14 for the <br />East Portal and West Portal respectively. WFC submitted these plans as a technical <br />revision to the permit. These revisions have been necessary because of preparation plant <br />construction, refuse area construction, and the need for more efficient routing of <br />disturbed water as well as ease of maintenance of the overall drainage system. The area <br />north of Ditches D11, and D19 to the Highway 12 easement were graded, covered with <br />subsoil and topsoil, mulched and seeded during August and September of 1990. <br />Picketwire Processing has three sediment ponds which collect surface disturbance runoff <br />from the East Portal area. These ponds are 004, 007 and 008. A fourth pond, pond 005, <br />was reclaimed in 2003, as the area serviced by this pond was never used for mining <br />related activities. These sedimentation ponds and associated diversion ditches have been <br />designed according to Section 4.05.6 of the OMLR Regulations. In addition, the <br />diversion structures have been designed utilizing the requirements of 4.05.3 and 4.05.4. <br />. Typical sections of the emergency spillways and embankments of each sediment control <br />structure are shown iu Figure 3, Typical Embankment Cross Section. "Typical <br />diversion sections are provided on Map 13 Sediment and Surface Water Co~arol Plan <br />-East Portal. Table 20, Ditch Data, is a summary of the diversion (ditch) data relating <br />to Map 13. Table 21, Culvert Sizing and Table 22, Culvert Sizing Nomograph, <br />provide backup for culvert sizing as per requested drainage modifications. Table 23, <br />Sediment Pond Dimensions, is a summary of sediment pond dimensions. <br />Picketwire Processing will control West Portal drainage using ditches, containment areas <br />and bypass culverts. All structures are shown on Map 14, Sediment and Surface Water <br />Control Plan -West Portal. Drainage basins are shown on Map 13A, Drainage <br />Basins, and calculations are found in Exhibit 19, Sediment Design Specifications. <br />I• <br />RN-04 Pagc 2.05-9 Rcviscd 4/30/04 <br />