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-11- <br />3. Diversions for Sediment Ponds <br />These diversions are temporary. However, no design information has <br />been presented For those entering Pond t14, nor for the inlet culverts <br />to Pond 111. These structures are shown on sheet 2 of DOR-[•JE-H-2 and <br />the water routing diagram. Designs must be submitted which provide for <br />the size, gradient, flow and location. <br />2.05.3(5) - Topsoil <br />The general description of the soils in the 'permit area was very extensive. <br />Ho~ee ver, salvage, storage and redistribution information was not adequately <br />presented. The following information must be provided: <br />1. Depths and horizons for topsoil salvage for each area, <br />2. Description of the topsoil buffer zone system, <br />3. Volumes and locations of topsoil stockpiles, <br />4. Origin and final destination for each stocY.pile, and <br />5. Depths of topsoil redistribution for each area. <br />2.05.3(8) - Coal Processing and Non-Coal Processing [/astes <br />1. As was addressed in Section 2.05.3(1) of this letter, coal waste production <br />is a concern of the Division. The applicant must provide justification and <br />confirmation that the volume of waste being generated can be safely placed within <br />the refuse pile as designed. According to the information presented in Section <br />2.05.3(1) of the adequacy response, refuse generation can be calculated as 392,149 <br />tons/year/continuous miner. If four continuous miners are used as proposed, the <br />resultant tonage would be approximately seven million tons. The applicant must <br />provide a revised certified design plan for the refuse disposal area which addresses <br />all of the concerns in (2.05.3(8)), (4.10) and (4.11). <br />2. Observations made by staff during inspections at the mine site have discerned <br />that waste is transpor.te6 to the pile and placed in a dewatering/ponding facility <br />located in the northeast corner of the waste pile. The slurry material is <br />impounded on top of the existing waste material where it is allowed to dewater. <br />The dewatered waste is then excavated and placed in a controlled manner on the <br />fill. During the past winter of 1981-1982, a failure occurred in the area of the <br />dewatering/ponding facility, resulting in a waste flow. <br />The description of the waste pile included in the application does not mention <br />the use or construction of a dewatering/ponding facility. The text and [gap No. <br />DOR-6-CTL-1 should be amended to properly describe the dewatering/ponding facility <br />now being utilized. Sufficient information must be provided to evaluate corppliance <br />with Rule (4.11.5). Further, the stability analysis of the waste pile should be <br />revised to evaluate the implications of elevated water content in the area of the <br />dewatering/ponding facility. A flatter than 2:1 (horizontal to vertical) slope <br />configuration may be required in this area in order to assure a static slope safety <br />factor of 1.5. <br />