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r~ L r 1 LJ UNIT TRAIN LOADOUT (UTL) Drainage within the rail loop of the UTL is routed to Pond 1+ 2. Sediment Ponds Nos. 1 and 2 consist of two depressions excavated during construction of the UTL(See Exhibit 11 B). Design capacity calculations are given in Appendix 13-2. Excavation in an adjacent borrow area has increased the capacity of Pond 1 beyond the original design. These ponds were installed with a single closed CMP emergency spillway for each pond with pumping for primary dewatering. Redesign in 1995 combined the two ponds with a v-ditch and increased the capacity of the combined Pond 1+2 to contain a 25 year, 24 hour runoff event. Primary dewatering will be done with a pump. The two existing CMP's will serve as emergency spillways. Another structure within the loop is the Sewage Lagoon system that contains an aeration cell and 3 evaporation cells. A portion of the area outside the rail loop is covered by alternate sediment control. Dust blown off the loading operation accumulates in an area immediately north of the rail loop. A berm has been installed around the area which collects the majority of the dust. See Table 13-5 and Appendix 13-3 for design information. RAILROAD SPUR AND OVERLAND CONVEYOR Sediment control for the Railroad Spur and Overland Conveyor (See Exhibit 10B) is achieved by maintaining a berm along Coal Creek and the Colorado River to contain runoff from this area. Across-section of the berm is shown in Exhibit 21. Sediment control for portions of the Overland Conveyor was achieved by placing a rock fill as shown on Exhibit 76. The rock fill will serve to protect the river bank from erosion during periods of high flow and also from runoff from local precipitation events. The rock fill will also serve as a filter for any water that backs up in the depression along the overland conveyor. The • 13-9 (Rev. 12/02)