_GENERAL DOCUMENTS - C1981017 (218)

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-2- 5) When determining sediment storage for the ponds, only the disturbed area was considered. The sediment from the 4.4 acre undisturbed portion of the drainage area must be included. Reclamation Plan - Rule 2.05.4 1 . Based on the recent study of revegetation on the present refuse pile, it is evident that 12 to 18 inches of topsoil is adequate to meet revegetation success standards on north and east facing slopes. However, the new refuse pile will primarily be south and west facing slopes. It is reasonable to expect that more topsoil will be required on these slopes since south and west aspects are known to be more xeric than north and east aspects. Based on the recent study, 12 to 18 inches of topsoil should be adequate for the relatively flat sections, 18 to 24 inches should be adequate for the west aspect, and 24-30 inches should be adequate for the south aspect. 2. The application must include a contingency reclamation plan, if the construction were to cease at the completion of the proposed five year configuration. This plan need not be detailed, but should present sufficient information to facilitate the necessary bonding determinations. 3. Mid-Continent must submit a detailed reclamation cost estimate similar to that doe by MLRD for the rock tunnel to wash plant conveyor system. The cost estimate must be based on volumes to be moved or removed, documented equipment production, and documented rental rates for equipment. Hydrologic Balance - Rule 2.05.6(3) 1 . The applicant should calculate the projected percent increase in total dissolved solids and soluble ions in the stream/alluvial system of Coal Creek due to the construction of the existing and proposed waste piles. These calculations should be made for impacts to water quality from each disposal site during peak, mean annual , and low flows in Coal Creek. The applicant should then assess the cumulative impacts of the two disposal piles on the quality of alluvial ground water and surface water in the steam/alluvial system of Coal Creek. 2. The applicant should also reassess the impacts that the present mines and mine facilities have on the quality and quantity of ground and surface waters in the permit and adjacent areas. This reassessment should incorporate recent as well as historic monitoring data. Where possible, graphical presentations of the data should be incorporated to summarize the data. Observed trends should be discussed. Projections of probable hydrologic impacts should be made for both surface and ground waters. Maps and Plans - Rule 2.10 1 . Mid-Continent must update maps II-B-1 and II-B-2d of Volume 1 of the permit application to show the new permit area and the new area permitted for disturbance.