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• Initially, the permanent diversion channels will drain into the <br />sediment pond at the top of the embankment. Following the <br />completion of the revegetation at the disposal area, the pond <br />will be filled to grade and reclaimed. At this time the per- <br />manent diversion channel will be extended to its full length, <br />emptying into North Thompson Creek. <br />Ditch D-9 was modified in TR-2, 7-2-86, to dump into Ditch D-10 <br />above the Refuse Pile Sediment Pond. Design for .drainage past <br />the pond, when reclaimed, is included in Appendix 4B, Volume 5, <br />Cosl Refuse Pile Drainage, Channel Design Psat Reclaimed Sediment <br />Pond. A portion of Drawing D-4-11 is included with the calcula- <br />tions to show the portion of Ditch D-10 redesigned. <br />•~ <br />Undisturbed drainage above the refuse disposal area and above the <br />road to the west, drainage areas 3a - 6, Drawing D-4-8, crosses <br />the road through culvert C-6. Culvert C-6 was originally <br />designed for a 10-year 24-hour event. A dip section or a 4' <br />diameter CMP will be constructed across the roadway near culvert <br />C-6 during the reclamation of the mine site to accommodate the <br />peak flow from a 100-year 24-hour storm. A permanent diversion <br />channel will be constructed across the site from the CMP or dip <br />section to North Thompson Creek. A 4' CMP will be installed <br />• 4-50 (Revised 6-20-88) <br />