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r~ L 816.50(a) Continued. No acid, toxic, or otherwise harmful materials exist within the overburden to be handled during mining in the Mine Plan Area. This conclusion is discussed in detail in Section 779.14 and is documented by data presented in Table 73, Chemical Analysis of Overburden. The method of backfilling will be a progressive re- placement of overburden material into previously mined-out areas with scrapers. Rough grading will be done with track-type bull- dozers. Scraper backfilling is a non-selective method of placing backfilled materials. However, since no acid, toxic, or otherwise harmful materials exist in the overburden, this method will not adversely affect to ground water quality within or outside the permit area. The proposed postmining land use, primarily non- irrigated rangeland, (See Section 780.23) will not be adversely affected by the proposed plan for backfilling. A detailed discus- sion on backfilling is presented under Sections 780.11 and 816.100- 816.106. At the Kerr Tipple Area, no acid, toxic, or otherwise harmful materials are known to exist in the fill material used to build the foundation bench. This fill material will remain in place, covered by topsoil and vegetation, after reclamation. The proposed post- mining land use, rangeland, will benefit by the existence of the fill. See Section 780.18. Since no acid, toxic or harmful mater- ials are known to exist at the tipple, and since the fill will aid the postmining land use of rangeland, no adverse effects on ground water systems will be incurred outside the permit area from the proposed operations and reclamation plan. (b) To control the effects of mine drainage, pits, cuts and other mine excavation or disturbances shall be located, designed, constructed and utilized in such manner as to prevent or control discharge of acid, toxic, or otherwise harmful mine dralnage waters into ground water 816-70