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III. Hydrologic Balance -Rule 4.05 <br />A. All disturbed area drainage passes through one of two existing sediment ponds. <br />Discharges from these ponds are monitored to verify compliance with water <br />quality standard and effluent limitators (4.05.2(2)). <br />B. Diversions and Conveyance of Overland Flow <br />1. All diversions within the permit area are designed and constructed in <br />accordance with Rule 4.05.3. Designs are discussed in Section 2.05.3 and <br />in Appendix 8 in the Section 2.05.3 in the perntit application. <br />C. Stream Channel Diversions <br />The Division proposes to approve the diversion of an intermittent stream. <br />This decision is based on a finding that the proposed diversion meets the <br />requirements of 4.05.18 and 4.05.4, applicable local, State, and Federal <br />statutes and regulations and that the diversion is designed to safeguard <br />public safety and to minimize adverse impacts to the hydrologic balance. <br />(4.05.4(1) and (4)). <br />2. Channel lining structures, retention basins, and artificial channel roughness <br />structures are proposed for use to control erosion. These means are <br />proposed to be approved by the Division since they are necessary to control <br />erosion, they are stable and will require infrequent maintenance. <br />(4.05.4(2)(a)). <br />D. Sedimentation Ponds <br />1. Design criteria and specifications have been approved for use in both <br />sediment ponds currently in place at the mine site. This decision was based <br />on a thorough analytical demonstration by a qualified professional engineer <br />that the resulting sediment pond will be as environmentally sound and <br />structurally stable taking into consideration physical, climatological and <br />other characteristics of the site. (4.05.6(11)). <br />E. Underground Development Waste <br />I. The coal refi~se will be mine waste rock extracted over the life of the mine. <br />The material is composed of dense, medium grained sandstone with <br />occasional shale and carbonaceous shale partings. It is estimated by <br />National King Coal that 30,000 cubic yards of mine waste will be extracted. <br />The waste bank is located east of the mine entrance, beginning just east of <br />the shop building and extending up the east side drainage approximately 900 <br />feet. A limit equilibrium static analyses was performed using effective <br />stresses to assure long term stability of the bank. A relatively flat 3h:ly <br />]0 <br />