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Any potentially acid- or toxic-forming spoil material will be identified by sampling <br /> regraded spoil, and will be chemically treated or buried with a minimum of four feet <br /> of topsoil. By neutralizing and/or isolating any acid- or toxic-forming material from <br /> the surface, and mixing limited quantities of such material with much greater <br /> volumes of benign spoil material, any negative effects of problematic material will <br /> be ameliorated. <br /> I. The Division proposes to approve the applicant's plan for disposal of <br /> debris, acid-forming or toxic materials, or materials constituting a fire <br /> hazard in a manner designed to prevent contamination of ground or <br /> surface waters. A contingency plan has also been developed to <br /> prevent sustained combustion of flammable materials. (4.14.3(1)(a)). <br /> 2. The Division proposes to approve 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 insure <br /> backfill stability. (4.14.3(2)). <br /> VIH. Revegetation <br /> Information pertaining to revegetation at the Yoast Mine is found in Tabs 10, 19, and <br /> 22 of the permit application package. <br /> Five major vegetation community types occur within the proposed Yoast permit area. <br /> These major vegetation community types are: Mountain Brush, Sagebrush, Aspen, <br /> Steep Mountain Brush, and Western Wheatgrass/Alkali Sagebrush. Additional <br /> community types occur within the proposed permit area but at considerably smaller <br /> acreages. These additional vegetation types include: Upland and improved <br /> subirrigated pasture, Mesic drainage, lands in the Conservation Reserve Program, <br /> Cropland, Alkali Sagebrush/Greasewood, and Alkali Meadow. Approximately <br /> 51.8% of the proposed permit area is comprised of Mountain Brush community at <br /> (1166 acres). Sagebrush is the next most dominant community representing 422.4 <br /> acres, or 18.7% of the permit area. The Aspen community ranks third in area with <br /> 333.5 acres, 14.8% of the permit area. All other community types are considerably <br /> less extensive with no one type exceeding 6% of the permit area. <br /> Seneca Coal Company collected baseline vegetation data during June, 1990 and July, <br /> 1992. Sampling was performed in accordance with the Regulations and was <br /> discussed with the Division prior to data collection. <br /> Seneca Coal Company has proposed five permanent reclamation seed mixes and one <br /> temporary seedmix. Seed mix IA will be used throughout the majority of the <br /> reclaimed area and has been formulated to re-establish an Upland Shrub Grassland. <br /> This seed mix is weighted towards perennial cool season grass species, with <br /> Yout Mine 31 October 19, 1999 <br />