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Post grading soil sampling conducted by the Division, and quantitative <br />and qualitative evaluation of vegetation establishment in subsequent <br />years indicate that replaced rootzone materials are suitable for <br />establishment and growth of desired vegetation. <br />V. Sealing of Drilled Holes and Underground Openings <br />1. Grand Mesa Coal Company is prudently managing holes, wells and <br />piezometers prior to sealing them. The Division requires that each <br />hole, well or other underground opening be capped, sealed, <br />backfilled, or otherwise properly managed (4.07.3). <br />VI. Use of Explosives <br />A. Use of explosives at the Red Canyon Mine was minimal during <br />underground operations. There are currently no explosives used at <br />the site; therefore this section does not apply (4.08). <br />VII. Disposal of Excess Spoil <br />A. The Red Canyon Mine will not require a disposal area for excess spoil <br />(4.09). <br />VIII. Coal Mine Waste Banks <br />A. The Division approved the use of a disposal area for underground <br />development waste. This waste dump is located east of the creek in <br />an area of previously mined strip pits. The proposed design <br />specified that the pile would move eastward into undisturbed land. <br />Original designs proposed the placement of 30,000 yd~ per year, for <br />a total of 159,000 tons of underground development waste. <br />Ultimately, 50,000 yards were placed at the site. <br />B. The Division has reviewed the design for the fill and proposes to <br />approve it. The design specifications for the underground <br />development waste pile may be found in Appendices B and D of the <br />permit application (4.09.1(2)). <br />C. The Division proposes to approve the use of a straw mulch to control <br />erosion, promote growth, and increase moisture retention on the <br />reclaimed underground development waste pile (4.09.1(4)). <br />D. The Division proposes to approve the location of the disposal area <br />(4.09.1(6)). <br />E. The applicant submitted a plan for disposal of Hotchkiss Coal Yard <br />waste on July 25, 1984, at the approved underground waste development <br />disposal area within the permit boundary. GMCC accepted 7,000 tons <br />during the summer of 1989. The applicant had demonstrated that <br />disposal of such materials would not adversely affect water quality <br />or flow, vegetation, public health, or stability of the disposal area <br />based on hydrologic, geotechnical, physical, and chemical analyses. <br />24 <br />