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The landfill area, a previously mined wadge area pit, will be reclaimed at the end of mining. Deadlines for backfilling and grading of these areas are presented on Exhibit 13-2. (4.14.1) 2. The Division has approved the retention of box cut spoil or initial cut spoil outside the pit area since the applicant has demonstrated that such material is not required to achieve approximate original contour in accordance with 4.09.1. Excess spoil was generated in the Wolf Creek Area, and was placed in a fill adjacent to the initial box cut. Information concerning the fill is located in Tab i2 of the permit application. (4.14.1(2)(d)). 3. Small depressions in the backfill will be used to minimize erosion, create or enhance wildlife habitat, conserve soil moisture, and promote revegetation. The Division proposes to approve their construction. The operator will have constructed a total of ten temporary impoundments in reclaimed areas by the end of 1992. The impoundments will serve as a water supply for livestock and wildlife in the area. Details of the construction and location of these impoundments are located in Attachment 7-2 of Tab 7 of the permit application. (4.14.2(3)). 4. The Division proposes to approve the applicant's plan for disposal of debris, acid-forming or toxic materials, or materials constituting afire hazard in a manner designed to prevent contamination of ground or surface waters. A contingency plan has also been developed to prevent sustained combustion of flammable materials. Details of the mitigation plan for acid-forming spoils encountered in the Wolf Creek mining area are located in Tab 6 of the permit application package. (4.14.3(1)(a)). Spoil materials with pH values of less than 5 and an acid base potential (ABP) of less than -5 will be covered with two to three feet of suitable spoil material, or will be treated with application of lime. Materials found to contain high concentrations of sodium will be disposed of in mining pits or will be covered with two to three feet of suitable spoil. All exposed coal seams remaining after mining will be covered with a minimum of four feet of the best available material. VIII 5. The Division proposes to approve the method and design specifications for covering of acid and toxic-forming materials in order to prevent leaching into surface and ground water and to insure backfill stability. (4.14.3(2)). Revegetation Information regarding revegetation practices and success criteria can be found in Tabs 10, 12, and 13 of the permit application package. The following findings were made reviewing that information: Soil stabilization practices at the mine include ripping on contour where topsoil slippage may occur, and use of a cover crop or mulch in conjunction with seed application. -31-