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of the channel which can not be drained to Pond 7. Exhibit 12C shows the <br />reclamation phase drainage. Tables 13-4 and 5 list drainage structures with <br />backup information in Appendices 13-2 and 3. <br />Roadside South Portal (RSS) <br />The drainage in and around the RSS operations area flows into Ponds 8 and 9. <br />Exhibit 6B includes drainage details. Pond 8 controls drainage from most of the <br />middle and north end of this operations area. In addition to the capacity for the <br />10 year, 24 hour runoff event and one year's sediment, Sediment Pond 8 was <br />designed to contain leakage and sediment associated with the preparation plant. <br />The primary source of water and sediment from the plant was a result of purging <br />lines and pumps associated with the clarifier tank. <br />Pond 8 was redesigned as part of permit revision no. 3 in 2007. The pond was <br />significantly downsized since the preparation plant no longer contributes flow to <br />the pond and run-off from the refuse pile has been reduced because it has been <br />covered with soil. See Appendix 13-2 for design calculations. <br />Drainage into Pond 8 involves multiple ditches, berms and culverts. Runoff on <br />and northeast of portal access road #1A is directed to a ditch along the inside of <br />the road. At the lower end of the road, the runoff enters ditches that direct the <br />flow to a berm along the west edge of the lower parking areas which direct the <br />flow to a grated concrete drain at the entrance gate. Water collected in the <br />grated concrete drain flows to Pond 8 through a 12 inch diameter pipe. A berm <br />along the west edge of the yard also directs flow to Pond 8. The upper diversion <br />ditch above the Roadside Refuse Pile collects drainage from above the portal <br />area and conveys the flow to Pond 9. <br />13-11 (Rev. 09/07) <br />