2012-05-15_PERMIT FILE - C1982056A

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and to collect material samples for lab testing. All auger -holes will be backfilled with cuttings, leveled, and hand - seeded with the approved rangeland seed mixture, on completion of drilling and sampling. is Main ROM Coal Stockpile (Located Near Portal) and Stockpile Expansion Review of coal handling systems and operations resulted in recognition of the need for increased coal stockpile capacity. In order to provide the required additional capacity, the coal stockpile area was expanded to the north and west in conjunction with site preparation and grading for the Coal Preparation Plant. Expansion required relocation and reconstruction of Pond E and the associated ditches, elimination of the segment of haul road which traversed the north edge of the stockpile area, and limited backfilling and grading work to expand the stockpile area. The stockpile expansion area was graded so that the base of the pile slopes to the north toward relocated Haul Road B -2. The stockpile expansion area is shown on Map 24, and required expansion activities are described under the appropriate section for each of the effected facilities. The stockpile expansion increased total capacity for the main stockpile area to approximately 600,000 tons. Most of the area affected by the ROM stockpile expansion, was previously disturbed; therefore no topsoil remains. Plant growth media recovery, however, occurred for the small area shown on Map 24, between the existing Pond E embankment and Haul Road B -2. Up to 4,170 cubic yards of plant growth media was recovered and stockpiled in stockpile (PPSP -2), located to the northeast, from an area approximately 752 x 100 feet (recovery depth approximately 1.5 feet). The reconstruction of Pond E required the removal of approximately 9,300 CY of topsoil from an area approximately 150 x 7,210 feet, with an average soil recovery depth of approximately 28 inches. Approximately 3,000 CY of the topsoil was placed in Stockpile SF4, while the remaining 6,300 CY was placed in Stockpile PPSP -1. Table 49a was revised to reflect these topsoil salvage and stockpile volumes. The existing drainage control plan was slightly modified to control drainage from the expanded coal stockpile, as shown on Map 24. The modifications included rerouting Ditch D -2 so that.it carries runoff and mine water around •the southern side of the coal stockpile area. The ditch, as shown on Map 24, drains into Pond D. Two culverts were placed in the Ditch D -2 at the locations shown on Map 24. A new ditch, which has been labeled Ditch E -2, was added to drain the water from the northern part of the stockpile into Pond E. This does not increase the drainage area tributary to Pond E, therefore, Pond E does not require resizing. Two culverts were placed in this ditch to pass water under an access point into the stockpile and under the haulroad. Design information for the ditch and culverts is contained in Exhibit 8. LJ Where a segment of Ditch D -4 crosses the south edge of the ROM /Low Quality Coal Stockpile area, a 22 -inch polyethylene pipe had been installed to maintain ditch drainage through this area, and allow the coal stockpile to be expanded, as needed. Problems with keeping this pipeline open and changes in stockpile management associated with the new Washplant resulted in removal of the pipeline and reestablishment of the affected segment of Ditch D- 4. The reestablished ditch section was constructed consistent with the original ditch design. While it is TCC's intent to retain and maintain this segment of Ditch D -4, we would like to reserve the option of replacing the previously approved culvert installation (22 -inch polyethylene pipe) with 24 -inch or larger CMP culvert, if needed to facilitate stockpile management and associated equipment operations. Design information for the ditch and culverts is contained in Exhibit 8. The ROM Coal Stockpile area will be reclaimed when no longer required for processing run of mine coal. Above - grade structures will demolished and disposed of in the portal area, and the area will be regraded, topsoiled, and revegetated with the appropriate seed mixture. MRI I -254 2.05 -25 06/28/11