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Therefore, the sediment pond was approved to be removed pursuant <br />to TR-10. However, the pond was not removed, and was <br />subsequently approved to be retained as a permanent impoundment, <br />pursuant to Technical Revision No. 13 (TR-13), approved September <br />15, 1996. <br />3. The Division proposes to grant three (3) small area exemptions <br />from use of sediment ponds during the operating life of the mine. <br />The Division approved these exemptions due to the limited size of <br />the area and due to the fact that ponds and treatment facilities <br />are not necessary for the drainage to meet the effluent limita- <br />tions of Rule 4.05.2 and applicable State and Federal water <br />quality standards for receiving streams, and also due to the fact <br />that no mixing of surface drainage with a discharge from <br />underground workings will occur. The exemption areas are located <br />in the service area on the fan shaft level, on the bath house <br />level, and in the area surrounding the powder magazine <br />(4.05.2(3)(b)(i)). <br />However, as a result of the sedimentation demonstrations made <br />pursuant to TR-10, these small area exemptions are no longer <br />applicable. <br />B. Diversions and Conveyance of Overland Flow <br />1. Sediment control ditches have been designed and constructed in <br />compliance with Rule 4.05.3. Locations are shown on Map <br />2.05.3(4)-2a, Post Reclamation Drainage System Map. <br />C. Stream Channel Diversions. <br />1. The maj oz drainage channel, which carries irrigation backwater to <br />the Carbon Ditch, was reconstructed to approximately the contours <br />shown on Map 2.05.4(2)(c)-1: Rip-rap, sized at 9-12 inches, was <br />placed in the channel and up the sides of the channel. Cross <br />sections of the channel can be found on Drawing 2.04.4(2)(c)-1, <br />and 2.04.4 (2)(c)-2. <br />2. The lower portion of this major drainage channel was relocated in <br />1997, pursuant to TR-13, so that it flows into the approved <br />permanent impoundment. <br />D. Sedimentation Ponds <br />1. One sediment pond was constructed on site. The pond was <br />designed, constructed, and maintained in accordance with the <br />requirements of 4.05.6 and 4.05.9. The location of this pond is <br />shown on Map 2.05.3(4)-2a, Post Reclamation Drainage System Map. <br />The pond was located as near as possible to the disturbed area <br />and was not located within perennial streams according to <br />5.05.6(1)(6). Pursuant to TR-13, the pond was approved as a <br />permanent impoundment, and is no longer classified as a sediment <br />pond. <br />19 <br />