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Y . <br /> sediment pond (4 . 0 acres) , rock spoil disposal area (13 .4 acres) <br /> and conveyor belt to the preparation plant (8 . 1 acres) . <br /> Three sediment ponds will be constructed east of the <br /> rock spoil pile in the alluvium of Dutch Creek (Appendix II-B-5) . <br /> The ponds will be located on a bench approximately 25 feet above <br /> the stream channel . Water from the disturbed area will be <br /> conveyed around the disposal area by a 2800 foot long perimeter <br /> diversion ditch system. The diversion ditch is designed for the <br /> ten-year precipitation event a,nd is located above the 100 year <br /> flood plain as documented by the storm event that occurred in <br /> July of 1977 . Mr . Scott Fifer, USFS , Glenwood Springs, Colorado, <br /> documented the 1977 flood as being in excess of the 100 year <br /> storm event . <br /> The rock spoil material will be composed primarily of <br /> dense Mancos shale. It will be placed on native outwash consisting <br /> of coarse gravel, cobblestone and boulders contained in a silty <br /> matrix. <br /> Professional engineering studies conclude that the <br /> proposed rock spoil disposal site is geotechnically sound. See <br /> Appendix II-B-5 for further details on the design and maintenance <br /> plan for the rock spoil disposal area. <br /> 8 . Coal handling <br /> In the Mid-Continent Coal Basin coal mining operation, <br /> coal handling is accomplished by utilizing shuttle cars , belt <br /> conveyors, storage bins, both on and off highway trucks and <br /> railroad coal cars . <br /> 67 <br />