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XVII. <br />2.05.4(2)(a), <br />Information on backfilling and grading can be found in Section 2.08.5 of the <br />permit renewal application. <br />The backfilling and grading plan has been revised from the original plan as <br />approved in Section 2.05.4 of the original permit document. Development of <br />Pit 2 will not occur to the southwest of the existing Pit 1 as planned. This <br />change in the mine plan required a change in the backfilling and grading plan <br />as material from Pit 2 will no longer be used to partially backfill Pit 1. <br />The material required to backfill Pit 1 will be obtained from the existing <br />overburden stockpile adjacent to the pit and from material obtained by <br />reducing the existing highwails. In this manner the bottom of the pit will be <br />elevated to a grade which allows for drainage of the area. A drainageway will <br />be created through the previous pit area to connect with the natural drainage <br />downstream as a part of final grading activities. <br />A total of 448,000 cubic yards of material will be backfilled into the <br />existing open pit. A volume of 284,700 compacted cubic yards will be obtained <br />from the overburden stockpile and 163,300 cubic yards will result from <br />reducing the highwails adjacent to the pit. The two highwails, on the east <br />and south of Pit 1, will be ripped and graded to 4H:1V to blend these slopes <br />into the surrounding terrain. <br />The drainageway will be constructed at the south end of the pit between the <br />two highwails. The drainage will daylight into an existing channel which <br />ultimately reaches Bolton Draw. The channel will be approximately 500 feet <br />long. <br />Prior to complete backfilling and regrading, a sediment pond (002) will be <br />constructed in the drainage corridor to control sediment from the southern <br />part of the pit area. Ali drainage to the north will pass through existing <br />sediment pond 001. A temporary drainage diversion ditch will be constructed <br />on the west side of the pit to keep undisturbed runoff from entering the <br />reclaimed area. Sediment pond number 3 and the diversions were removed <br />following the 1990 Bond Release request. Ponds 1 and 2 were aproved as <br />permanent impoundments per TR-06 and in Compliance with 4.05.6(14). <br />Topsoil will be salvaged from the drainageway and highwall reduction areas. <br />Approximately 8,000 cubic yards of topsoil will be live handled from these <br />areas and 64,000 cubic yards are available for respreading from the existing <br />stockpile. The 72,000 cubic yards will provide an average cover of 0.5 feet <br />over the 81 acres to be topsoiled. <br />Reclamation of the load-out site in Walden will include removal cf 1,550 cubic <br />yards of coal pad material. This material will be hauled to the mine site and <br />backfilled into the pit. The surface of the load-out will be constructed to <br />provide positive drainage to the low area on the south end of the loadout. <br />The operation is in compliance with the requirements of this section. <br />2i <br />