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Approximately 600 ft. of final dragline highwall in the eastern <br />portion was completed in 2003. The western 800 ft. of pit area <br />was mined in 2004. Highwall mining was scheduled for 2005; <br />however, the highwall miner has been dismantled and demobilized <br />from the Yoast Mine and was no longer utilized. Since mining <br />ceased in this location, SCC conducted final backfilling and <br />grading of the final pit containing the access and associated spoil <br />area in 2006. <br />SCC followed the backfilling and grading sequence shown on <br />Exhibit 194A, Backfilling and Grading Plan, and the associated <br />reclamation schedule to achieve the post mine topography <br />presented on Exhibit 20-2 of the permit application package. <br />Any potentially acid-or toxic-forming spoil material was to be identified by <br />sampling regraded spoil, and would be chemically treated or buried with a <br />minimum of four feet of topsoil. By neutralizing and/or isolating any acid- or <br />toxic-forming material from the surface, and mixing limited quantities of such <br />material with much greater volumes of benign spoil material, any negative effects <br />of problematic material will be ameliorated. <br />2. The Division previously approved the applicant's plan for disposal <br />of debris, acid-forming or toxic materials, or materials constituting <br />a fire hazard in a manner designed to prevent contamination of <br />ground or surface waters. A contingency plan was also developed <br />to prevent sustained combustion of flammable materials. <br />(4.14.3 (1)(a)). <br />3. The Division previously approved the method and design <br />specifications for covering of acid- and toxic-forming materials in <br />order to prevent leaching into surface and ground water and to <br />insure backfill stability. ((4.14.3(2)). <br />As mentioned previously in this document, SCC conducted the required spoil <br />monitoring over the course of reclamation of the disturbed areas, and no acid- <br />forming or toxic-forming materials were identified. <br />VIII. Revegetation <br />Information pertaining to revegetation at the Yoast Mine is found in Tabs 10, 19, <br />and 22 of the permit application package. <br />Five major vegetation community types occur within the Yoast permit area. These <br />major vegetation community types are: Mountain Brush, Sagebrush, Aspen, Steep <br />Mountain Brush, and Western Wheatgrass/Alkali Sagebrush. Additional <br />community types occur within the permit area but at considerably smaller <br />Yoast Mine 32 December 15, 2010