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• The East Collection Channel originates north of the permits area as Carbon Junction <br />Canyon. This channel collects surface runoff from the North and South Pits, the <br />majority of the Permanently Reclaimed Spoils Area, surface facilities area, and all <br />other disturbed azeas of the mine, and conveys the drainage to Sediment Pond No. 1. <br />This channel has been sized to accommodate the entire drainage area described above <br />and pit pumpage after a 10 year-24 hour precipitation event. The segment of this <br />channel above the haul road will serve as the final configuration for Carbon Junction <br />Canyon after final reclamation. After Sediment Pond No. 2 is no longer needed, and <br />after final rec]amation, Carbon Junction Canyon (East Collection Channel) will be <br />joined to lower Carbon Junction Canyon (below the haul road) to complete the original <br />flow path and surface water drainage. <br />Designs for collection ditches and channels are contained in Appendices 5-2, 5-9, and <br />on Map 5-10. Al] ditches were constructed to control the design flow and to minimize <br />erosive velocities during design event conditions. <br />Under the current configuration, and until the pit is developed, runoff within the <br />Carbon Junction watershed is controlled by the East Collection Channel and Sediment <br />Pond No. 1. After pit development, the pit itself will serve to trap surface runoff. <br />Accumulated runoff will then be pumped from the pit to the East Collection Ditch with <br />ultimate treatment in Sediment Pond No. 1. <br />Stream CBanne/ Jieconstrvclion <br />A permanent channel is proposed for Carbon Junction Canyon within the pit area and <br />adjacent to the permanently reclaimed spoils area. Design of this structure has been <br />depicted in Appendix 5-2 and on Map 5-10. Sizing calculations are contained in <br />Appendix 5-9. <br />Certircalion and Inspection <br />The designs for the various structures have been appropriately certified. The sediment <br />control system will be inspected during construction and certified by a registered <br />professional engineer as required. <br />Ditches, and ponds are inspected annually in accordance with Rule 4.05.9(13). After <br />significant precipitation events, ditches, channels, and ponds will be cleaned and <br />repaired as required. Hay bales and riprap are inspected periodically and repaired as <br />required. <br />i <br />Technical Revision OS (v 1.3) 5-12 Revised 9/1997 <br />