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-42- <br /> • <br /> The overburden analyses did reveal SAR values exceeding soil suitability <br /> criteria defined in Wyoming DEQ Guideline No. 1 , however, this will not be a <br /> problem as all waste will be covered with four feet of non-toxic , <br /> non-combustible material during reclamation. <br /> The refuse disposal area is divided in to eleven subareas. At the time the <br /> initial permit was approved, the permittee anticipated that only approximately <br /> ten acres would be in use at any one time to minimize the total disturbed <br /> area. However, some time after permit approval when refuse disposal <br /> operations got underway, it became apparent that additional acreages would <br /> need to be developed in order to provide sufficient room for the drying of <br /> refuse to attain the appropriate moisture percentage necessary to meet <br /> compaction requirements. As a result, a technical revision to the permit was <br /> approved by the Division on September 26, 1985, which allowed Western Fuels to <br /> open an additional pair of subareas (Nos. 2 and 3) ahead of schedule to <br /> provide additional room for the drying of refuse. With the approval of the <br /> technical revision, the maximum anticipated disturbed area at any one time has <br /> been increased to fifty acres. <br /> During construction, the area will be inspected quarterly and the proper <br /> placement certified by a registered professional engineer in compliance with <br /> Rule 4.10.2 of the Colorado; Permanent Regulatory Program. <br /> A surface water control system has been constructed for use during the <br /> development of the refuse piles and subsequent to reclamation of the piles. <br /> See the Surface Water section of this findings document. <br /> The face slopes on all fills will be 5h:ly. A stability analysis of these <br /> slopes was conducted by the Office of Surface Mining. Several different <br /> parameters were varied to test the stability of the pile under different <br /> conditions. A computer program based on the Simplified Bishop Method was used <br /> of 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 <br /> to be stable under the weight of the refuse material . This slope will also <br /> facilitate the post-mining land use of grazing and will be compatible with the <br /> natural surroundings. <br /> Combustion of the refuse material will be minimized through compaction of the <br /> refuse. If a fire should start, individuals authorized by the mine operator <br /> will extinguish the fire. Burned waste will be removed from the disposal rea <br /> after approval from the appropriate regulatory authorities. <br /> Non-Coal Waste Disposal <br /> All non-coal solid wastes produced by the Deserado mining operation are <br /> disposed of at the Halandras garbage dump located on the western portion of <br /> the permit area adjacent to County Road 65. The disposal facility was <br /> approved by the Division on March 28, 1985 through a technical revision to the <br /> . existing permit. The disposal area is developed sequentially whereby a single <br /> pit measuring approximately 300'L x 10'W xl5'D is excavated, filled with <br /> refuse, compacted and covered with overburden, topsoiled and seeded. <br /> Approximately one foot of topsoil is salvaged and stockpiled prior to <br /> excavating the pit. As soon as one pit is filled, the next pit is developed <br /> followed by reclamation of !�the preceding pit. Sediment controls are provided <br />