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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 facilities <br />are not necessary for the drainage to meet the effluent limitations of Rule 4.05.2 and <br />applicable State and Federal water quality standards for receiving streams and also due <br />to the fact that no mixing of surface drainage with a discharge from underground <br />workings will occur. The small areas to be exempted are: a) the area at the King I <br />Mine that extends from the mine entrance gate to the east pond next to the haul road, <br />including a mine timber storage area as described in King I Appendix 11(2), and b) <br />the segment of the King II Mine haul road that extends from the entrance gate to the <br />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 with <br />Rule 4.05.3. Designs are discussed in Section 2.05.3 and Appendix 11 in the PAP. <br />C. Stream Channel Diversions <br />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 square <br />mile. The other stream is Cochrane Canyon, located east of the King II portal <br />area, and drains more than one square mile. These decisions are based on a <br />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 minimize adverse impacts <br />to the 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 proposed to <br />be approved by the Division since they are necessary to control erosion, they are <br />stable, and will require infrequent maintenance (4.05.4(2)(a)). <br />16 <br />