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Page 5 of 6 <br />designs that show that a culvert of a certain diameter can handle the designed peak discharge <br />for the designed precipitation event. Please provide the appropriate Sedcad data sheets for all of <br />the loadout culverts. <br />57. Please add a more detailed description in Section 2.05.3(4)(a)(ii)(C) on permit text 2.05-18 <br />and in the Probable Hydrologic Consequences Section 2.05.6(3)(b)(iii) starting on permit text <br />page 2.05-49 for the process of dewatering the sediment ponds, including how Reed Wash will <br />be protected from erosion and siltation from disposal of the pond water. <br />The Division has no further concerns. On revised permit text pages 2.05-19, 56 and 57 of the <br />April 11, 2011 submittal, BRL added text that further described the pond dewatering method <br />and how pond discharge will not affect Reed Wash. <br />58. On permit text pages 2.05-18 and 2.05-19 in Section 2.05.3(4)(a)(ii)(C), please describe where <br />the excess sediment from the pond cleanings will be disposed. <br />The Division has no further concerns. As described in the April 11, 2011 submittal on revised <br />permit text page 2.05-28, any coal fines from sediment pond and ditch cleaning will be <br />disposed of at the McClane Mine. As is mentioned in the April 11, 2011 cover letter, the <br />McClane Mine permit will need to be revised to include this operation. <br />58A. On revised page 2.05-19 of the April 11, 2011 submittal, there is a statement that the ponds will <br />be cleaned out no later than when the ponds are 75% full of sediment. Please revise this <br />sentence to read that the ponds will be cleaned out when the sediment level reaches no more <br />than 75% of the designed sediment capacity. <br />59. As stated on permit text page 2.05-20 in Section 2.05.3(4)(d), the Division has to make a <br />finding that runoff from disturbances within 100 feet of Reed Wash will comply with Rule <br />4.05.18. If sediment ponds 3 and 4 are eliminated and best management practices are <br />employed through a revision of the sediment control system for the rail loop, please revise <br />permit text page 2.05-20 to show how the requirements of Rule 4.05.18 will be met. If silt fence <br />is used, the Division requests that Sedcad designs for silt fence be provided for those stream <br />buffer zone areas in order to demonstrate compliance with the stream buffer zone rule. The <br />Division will make the findings once the sediment control system designs have become final. <br />The Division has no further concerns. Although the silt fence designs are not needed from the <br />standpoint of a haul road not within the disturbed area, the silt fence designs were provided to <br />demonstrate that runoff from the disturbed areas will be in compliance with Rule 4.05.18. The <br />Division will make its findings concerning Rule 4.05.18 once the hydrology review is finished. <br />60. If CAM elects to revise the sediment control system and eliminate most of the sediment ponds <br />for the railroad loop and, instead, uses best management practices, please revise the protection <br />of hydrological balance discussion in Section 2.05.6(3), the water depletion estimate in Section <br />2.04.11(4) and any other relevant permit section.