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-54- <br /> The application includes a request for variance from approximate original <br /> contour reconstruction based upon steep slope mining conditions. For a <br /> discussion of this item, see Section XXIV, "Special Categories of Mining". <br /> The application also includes a request to defer final road reclamation design <br /> until the completion of further observations. For a discussion of this topic, <br /> see Section XX, "Roads". <br /> With satisfactory resolution of the stipulations, the proposed operation will <br /> be in compliance with the requirements of this section. <br /> XVII . Mine Facilities, Coal handling Structures, Support Facilities - <br /> Rules 2.05.3(3), 2.05.3 7 and 4.04 <br /> The mine facilities, coal handling structures, and support facilities in <br /> Section II-B of Volume 1 of the application have been reviewed for compliance <br /> by the Division. <br /> The Coal Basin mine surface facilities consist of a preparation plant, <br /> explosive storage, methane gas pipeline, sewage treatment facility, water <br /> system, power transmission facilities, and numerous support facilities. Their <br /> locations are shown on Exhibits II-B-2-a through d in Volume 1 . A list and <br /> descriptions of all surface buildings and structures is located in Appendix <br /> II-B-6 of Volume 2. <br /> Coal handling procedures are as follows: Raw coal is hauled from the <br /> respective mines to a storage area or to raw coal bins. Raw coal is then <br /> conveyed to the wash plant which separates clean coal from refuse material <br /> using three separate circuits. Depending on the size of the material , the raw <br /> coal either goes through a heavy media bath, deister tables, or flotation <br /> cells. After the refuse is removed, the coal is dewatered using either a <br /> thermal dryer, vacuum filters, or dewatering screens, depending on coal size. <br /> The coal is then stored in bins until it is transported to the load-out <br /> facility. <br /> The proposed operation is in compliance with the requirements of this section. <br /> XVIII. Coal Processing Waste and Non-Coal Processing Waste - Rules 2.05.3(8) , <br /> 2.05.4 2 M, 4.10 and 4.11 <br /> Coal refuse from the coal preparation wash plant at the Coal Basin Mines was <br /> deposited by conveyor and front-end loader in an approved area to the east of <br /> the wash plant until July of 1984. Coal refuse was deposited at this site <br /> continuously since 1961 . As of the spring of 1981 , the company estimated that <br /> approximately 1 .5 million cubic yards of coal refuse had been deposited within <br /> this pile, attaining a maximum height of 125 feet with a facial angle of 380. <br /> Mid-Continent Resources, Inc. had a geotechnical investigation and stability <br /> analysis prepared for the existing waste pile configurations. Morrison <br /> Knudsen, Inc. , and Whaller and Associates, Inc. , participated in the <br /> performance of the analyses. The stability analysis, completed in accordance <br /> with the prudent state-of-the-art of embankment stability analysis, determined <br /> that the existing pile configuration achieved a static slope safety factor of <br /> 1 .5. <br />