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The ovet~urden analyses did reveal SAR values exceeding soil suitability criteria <br />defined in Wyoming DEQ Guideline No. 1; however, this will not be a problem, as all <br />waste will be covered with four feet of non-toxic, non-combustible material during <br />reclamation. <br />The refuse disposal area is divided into 11 subazeas. At the time the initial permit was <br />approved, the permittce anticipated that only approximately ten acres would be in use <br />at any one time to minimize the total disturbed area. However, some time after permit <br />approval, when refuse disposal operations got underway, it became apparent that <br />additional acreages would need to be developed in order to provide sufficient room for <br />the drying of refuse to attain the appropriate moisture percentage necessary to meet <br />compaction requirements. As a result, a technical revision to the permit was approved <br />by the Division on September 26, 1985, which allowed Western Fuels to open an <br />additional pair of subareas (Nos. 2 and 3) ahead of schedule to provide additional <br />room for the drying of refuse. With the approval of the technical revision, the <br />maximum anticipated disturbed area at any one time has been increased to 120 acres. <br />The current status of the refuse areas is as follows: Refuse Area 1 is reclaimed, <br />Refuse Areas 2 and 3 (combined) and Refuse Area 4 are in use, construction has <br />begun on Refuse Area SA. <br />During construction, the refuse piles are inspected quarterly and the proper placement <br />certified by a registered professional engineer in compliance with Rule 4.10.2 of the <br />Colorado Permanent Regulatory Program. <br />been constructed for use durin>; the development of <br />Document. <br />The face slopes on Refuse Areas 1-4 aze Sh:ly. Refuse Area SA will be constructed <br />with a 4(h):1 slope. A stability analysis of these slopes was conducted by the Office <br />of Surface Mining. Several different paruneters were varied to test the stability of the <br />pile under different conditions. a computer program based on the Simplified Bishop <br />Method was used in the analysis. The stability of this slope was found to meet the <br />requirements of a safety factor of 1.5. Foundation materials were also found to be <br />stable under the weight of the refuse material. This slope will also facilitate the post- <br />mining land use of grazing and will be compatible with the natural surroundings. <br />Combustion of the refuse material will be minimized through compaction of the refuse. <br />If a fire should start, individuals authorized by the mine operator will extinguish the <br />fire. Burned waste will be removed from the disposal area after approval from the <br />appropriate regulatory authorities. <br />A. The Division approved plans for use, construction and maintenance of a coal mine <br />waste disposal azea. The approval was based on a demonstration that no <br />groundwater exists to a depth of at least 44 feet below the refuse area, and no <br />springs or seeps aze known to exist in the azea (4.10.1(1)). <br />2l <br />