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III. Protection of the Hydrologic Balance — Rule 4.05 <br />A. Water Quality Standards and Effluent Limitations <br />The Division has approved two small area exemptions from use of sediment ponds <br />due to the limited size of the areas and due to the fact that ponds and treatment <br />facilities are not necessary for the drainage to meet the effluent limitations of Rule <br />4.05.2 and applicable State and Federal water quality standards for receiving streams <br />and also due to the fact that no mixing of surface drainage with a discharge from <br />underground workings will occur. The small areas to be exempted are: a) the area at <br />the King I Mine that extends from the mine entrance gate to the east pond next to the <br />haul road, including a mine timber storage area as described in King I Appendix <br />11(2), and b) the segment of the King 11 Mine haul road that extends from the <br />entrance gate to the sediment pond (4.05.2(3)(b)(i)). <br />B. Diversions and Conveyance of Overland Flow <br />All diversions within the permit area are designed and constructed in accordance <br />with Rule 4.05.3. Designs are discussed in Section 2.05.3 and in Appendices 8 and <br />11 in the permit application. <br />C. Stream Channel Diversions <br />1. The Division has previously approved the diversion of an intermittent stream <br />draining less than one square mile, which flows along the north side of the coal <br />waste pile at the King I Mine. The Division also has previously approved the <br />temporary diversions of two ephemeral streams at the King II Mine. One <br />unnamed stream west of the King II mine portal area drains less than one <br />square mile. The other stream is Cochrane Canyon, located east of the King 11 <br />portal area, and drains more than one square mile. These decisions are based <br />on a finding that the proposed diversions meet the requirements of 4.05.18 and <br />4.05.4, applicable local, State, and Federal statutes and regulations, and that the <br />diversions are designed to safeguard public safety and to minimize adverse <br />impacts to the hydrologic balance (4.05.4(1) and (4)). <br />2. Channel lining structures, flow dissipators, and artificial channel roughness <br />structures are proposed for use to control erosion. These means are proposed <br />to be approved by the Division since they are necessary to control erosion, they <br />are stable, and will require infrequent maintenance (4.05.4(2)(a)). <br />D. Sedimentation Ponds <br />Design criteria and specifications have been previously approved for use in design <br />and construction of the two sediment ponds at the King I Mine and the sediment <br />pond at the King 11 Mine. This approval is based on a thorough analytical <br />demonstration by a qualified professional engineer that the resulting sediment pond <br />15 <br />