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• o Cover any coal seams or demolition debris with minimum of four (4) feet of <br />suitable material <br />o Eliminate highwalls <br />o Establish a post-muting configuration which complies with regulatory <br />requirements for long term stability and blends with surrounding undisturbed <br />and reclaimed azeas <br />o Reestablish drainage patterns sirrulaz to those which existed in the pre-[noting <br />environment <br />The design postmining topography developed by EFC] meets these objectives while <br />m;n;mi>ing any additional disturbance and maintaining minimal gradients consistent <br />with suaounding natural slopes. <br />For the mine azea, backfilling activities will involve reducing side-slopes in coal <br />stockpile azeas, backfilling the mine portals and poaal bench azea if the portal facilities <br />aze not retained, recontouring the mine faalities azea, and reconstruction of the <br />Magpie Creek diversion to meet applicable regulatory requirements for permanent <br />• diversion structures. Backfilling will be accomplished utilizing available on-site <br />egwpment including tractor-scrapers, wheel-loaders and tntcks, tracked dozers and <br />motor-graders as appropriate. Within the mine azea, the design posttnuung <br />topography will require handling and placement of approximately 55,000 cubic yazds <br />of overburden material. The resulting postmining configuration is illustrated by the <br />Mine Area Postmining Topography Map, (Map 28), and the Mine Area Premising and <br />Postmining Cross-Sections, (Map ~. <br />Establishment of the Magpie Creek diversion as a permanent diversion structure will <br />im~olve widening the channel, laying back the adjacent slopes and limited placement of <br />riprap materials. The permanent Magpie Creek diversion channel has been designed <br />to pass the peak f)ows resulting from a 100-yeaz, 24hour stoat[ event. Design <br />calcu]ations aze presented in Exhibit ]9, Drainage and Sediment Control Plan, and the <br />diversion channel location and alignment are illustrated by the Magpie Creek <br />Diversion - As Built Drawing, (Map 25), and the Mine Area Postmining Topography <br />Map, (Map 28). <br />• <br />Minor Revision MR-41 2.05.4]0 Revised December 2001 <br />