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• Reclaimed Spoils Area to Sediment Pond No. 1, the East Collection Channel has been constructed to convey surface water runoff to Sediment Pond No. 1. Runoff from the coal facilities azea is conveyed via the East Collection Ditch around the east end of the facilities area to Sediment Pond No. 1. Surface water drainage from Topsoil Stockpile No. 2, the west face of the permanently reclaimed spoils area, and a small segment of the haul road is conveyed via the West Collection Ditch to Sediment Pond No. 2. Sediment Pond No. 2 was originally designed and constructed to handle flows from a larger area, and as such is currently oversized. Within the next few years, as reclamation of the permanently reclaimed spoils area is completed, Sediment Pond No. 2 will become unneeded and ultimately removed. Designs for all elements of the sediment control plan are contained in Appendices 5-2, 5-9, 5-10. and Map 5-10. The location of sediment ponds, collection ditches, and collection channels are shown on Maps 5-1, 5-9, and 5-9a, and 5-10. Cross sections and detailed design criteria are contained in Appendices 5-2 and 5-9. Map 5-9 shows the entire hydrologic basin used to compute surface runoff. At this time there aze no facilities or structures which require alternative sediment control measures (SAE'S). Sediment Ponds The general plan calls for two sediment ponds. Sediment Pond No. 1 will handle the surface runoff from the surface facilities area, the North and South Pits, and Carbon Junction Canyon. Sediment Pond No. 2 controls runoff from a small area of the permanently reclaimed spoils azea, Topsoil Pile No. 2, and a small segment of the haul road. Surface runoff from the gravel operations is directed to and retained in a separate sediment pond, which was designed and constructed as part of the gravel operations. Sediment pond sizing, design, and operation is explained in Appendices 5-2 and 5-9. Collectoon Ditthes and CTiannels Two collection ditches and one collection channel route surface runoff to the sediment ponds. The East Collection Ditch collects runoff from an area south and west of the gravel operations and conveys flow to Sediment Pond No. 1.. A compacted berm was constructed below the east collection ditch to prevent any disturbed area runoff escaping from the northeast comer of the surface facilities azea. The West Collection Ditch collects surface drainage from the northwest segment of the haul road, and a small area of the Permanently Reclaimed Spoils Area and conveys the runoff to Sediment Pond No. 2. Runoff from Topsoil Pile No. 2 is contained within a small berm constructed around the tce of the pile. No significant amount of water is ever retained by this berm. Technical Revision 08 (v 1.3) 5-11 Revised 9/1997