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-4- The proposed disposal methods will have to be carefully specified, in order to assure that thelmaterial properties achieved will be consistent with the final geotechnical investigation and stability analysis performed in accordance with the requirements of Rules 2.05.3(6)(b)(c)(d). Subsidence - Rule 2.05.6(6) 1. The application must include a subsidence survey, subsidence monitoring and subsidence control plan, in accordance with Rule 2.05.6(6). The brief treatment included on pages 123 and 124 of the application suggest that the subsidence will be prevented by limiting extraction to less than 50%. The brevity of the presentation renders it grossly inadequate for permitting purposes. The applicant should amend the application to respond specifically to Rule 2.05.6(6). It will be important for the amended application to clearly depict and describe the anticipated affects of subsidence. If the applicant proposes to utilize subsidence control, such as limited extraction, to prevent material damage from occurring, then a submittal should be prepared in accordance with the requirements of Rule 2.05.6(6)(f). In all likelihood, a subsidence monitoring program, as required by rule 2.05.6(6)(c), will be necessary to verify predictions included within the presentation of the subsidence control plan. Hydrologic Balance - Rule 2.05.6(3) The applicant must submit a description of the probable hydrologic consequences of mining. This description should include the impacts of mining on the quantity and quality of both surface and ground water. Impacts which should be assessed and described include: 1) depletions of flows in Harvey Gap during and after mining; 2) impacts of mine water on water quality in Harvey Gap during and after mining; 3) impacts of the coal refuse pile on water quality in Harvey Gap; 4) impacts to the quality and quantity of ground water; and 5) impacts to ground water use (wells and springs). The applicant should assess the significance of each potential mine impact. The applicant should describe those measures it will employ to minimize surface and ground water impacts to both water quality and water quantity. The applicant should then provide a plan to mitigate any water quality or water quantity impacts which will cause degradation of water quality or diminution of water quantity off-site. Alluvial Valley Floors -Rule 2.06.8 1. A statement on page 55 indicates that flood irrigated alluvial deposits of the Colorado River are contained within the permit area. Figure 1 indicates that no irrigated lands are present within the permit area. This discrepancy should be clarified.