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• have been designed by a registered professional engineer. Detailed <br />drawings and construction design criteria have been described and are <br />enclosed in this application. <br />4.1.8 Coal Processing Waste <br />Although Empire does not have a preparation plant, waste rock is <br />physically separated from the raw coal at the rotary breaker previously <br />described. This rock is taken to the coal refuse embankment area shown <br />on P•1ap IV-2. A construction and stability design for the refuse <br />embankment has been designed by Robert W. Thompson of CTL/Thompson, Inc. <br />of Denver. Said report is included as Appendix IV-5 and represents the <br />methodology of construction adopted by Empire. This design is an <br />• alternative design to those set forth for construction of coal refuse <br />embankments established in Rule 4. <br />Prior to construction of the pile, as specified in Appendix IV-5, <br />two topsoil stockpiles must be moved and a small undisturbed area <br />(approximately 1 acre) must be stripped of the topsoil. The new topsoil <br />stockpile locations are shown on map III-g. The topsoil to be stripped <br />is in the Evanston series (mapping unit 7C) and approximately 18 inches <br />of topsoil is available. It is assumed the existing topsoil stockpiles <br />contain soil of the same series, as this area was previously disturbed <br />and no soils information was available. The reader is referred to <br />Appendix III-9 for a discussion of the suitability of this soil as a <br />plant growth media. <br />. The Plo. 9 mine may inrrease the amount of waste rock added to the <br />(REV. 12/13/83) <br />IV-71 <br />