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The Division has approved two small area exemptions from use of sediment <br /> ponds 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 <br /> Rule 4.05.2 and applicable State and Federal water quality standards for receiving <br /> streams and also due to the fact that no mixing of surface drainage with a discharge <br /> from underground workings will occur. The small areas to be exempted are: a) <br /> the area at the King I Mine that extends from the mine entrance gate to the east <br /> pond next to the haul road, including a mine timber storage area as described in <br /> King I Appendix 11(2), and b) the segment of the King II Mine haul road that <br /> extends from the 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 Appendix 11 in <br /> the PAP. <br /> C. Stream Channel Diversions <br /> 1. The Division has previously approved the diversion of an intermittent <br /> stream draining less than one square mile, which flows along the north <br /> side of the coal waste pile at the King I Mine. The Division also has <br /> previously approved the temporary diversions of two ephemeral streams at <br /> the King II Mine. One unnamed stream west of the King II mine portal <br /> area drains less than one square mile. The other stream is Cochrane <br /> Canyon, located east of the King II portal area, and drains more than one <br /> square mile. These decisions are based on a finding that the proposed <br /> diversions meet the requirements of 4.05.18 and 4.05.4; applicable local, <br /> State, and Federal statutes and regulations; and that the diversions are <br /> designed to safeguard public safety and minimize adverse impacts to the <br /> hydrologic balance (4.05.4(1) and (4)). <br /> 2. Channel lining structures, flow dissipaters, 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 /> 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 II Mine. This approval is based on a thorough analytical <br /> 15 <br />