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RULE 2 PERMITS <br /> <br />Collom – Rule 2, Page 75 Revision Date: 4/28/22 <br /> Revision No.: TR-154 <br />will be hauled from the topsoil stockpiles. Direct placement of topsoil will be the preferred method, <br />however, the stockpiled material will be utilized if equipment schedules, weather conditions or other <br />operational factors make direct placement less desirable or less cost effective. After mining and regrading <br />operations have ceased, all stockpiled topsoil will be used to reclaim the remaining pit and other <br />disturbance areas. <br /> <br />Topsoil will be stored in topsoil stockpiles as shown on Map 28C Sheet 1. Stockpiles will be constructed <br />with outside slopes no steeper than 3H:1V. Stockpiles are specifically located to avoid erosion from wind <br />and water and additional compaction or contamination. As can be determined from the Topsoil Handling <br />Map (Map 28C Sheet 1), all stockpiles are located within stable areas. The piles will be protected from <br />wind erosion by planting a perennial mixture as explained in Section 4.06.3 as soon as conditions allow. <br />Proper seasons of planting will be early spring or late fall. In addition to the planted material, a <br />considerable amount of volunteer growth can be expected to grow on all stockpiled topsoil. <br /> <br />External erosion will be controlled through proper location of the stockpiles. No topsoil stockpiles will be <br />placed in a drainage bottom where external erosion might pose a potential threat. <br /> <br />Unnecessary compaction will be avoided by keeping all but essential traffic off the stockpiled areas. In <br />accordance with Rule 4.02.7, topsoil signs will identify topsoil stockpiles. Contamination of the <br />stockpiles will be eliminated by the careful selection of sites that are distant from the areas where actual <br />mining activities are occurring. Drainage ways and areas near spoiling and blasting will be avoided where <br />possible. <br /> <br />2.05.3 (6) Overburden <br /> <br />Additional description of the removal, handling and storage of overburden material within the permit area <br />is described in Section 2.05.3(1). The spoil handling monitoring plan parameters for the operation can be <br />found below. <br /> <br />Overburden Monitoring Program <br /> <br />As discussed in Volume 1, as long as the total percentage does not exceed 15% of the total truck/shovel <br />sequence for each drill hole, suitability should not be an issue based upon the upper overburden seam <br />quality and the expected dilution of lower overburden materials (more likely to exhibit elevated parameter <br />levels) through mixing as part of the logical mining sequencing of overburden and coal removal in the <br />Collom area. <br /> <br />In the following analysis, Colowyo demonstrates the likelihood spoil material placed near the surface of <br />final regraded overburden areas will be unsuitable is low. This demonstration was completed by showing <br />the total percentage of unsuitable material as it relates to the drill hole data shown in Volume 17, Exhibit <br />6 Item 9 for the sources of the majority of overburden to be generated in the area. A review of the <br />analysis spreadsheet for drill hole C-04-04 shows that the source of all elevated SAR levels (> 15.0) <br />originates from the bottom 121 feet of overburden from the bore hole. Normal overburden haulage and <br />sequencing will ensure this material will not contribute to elevated SAR levels on the reclaimed surface <br />post-mining in the Collom expansion area. <br /> <br />Drill Hole C-04-14 <br /> Unsuitability range in feet: <br /> SAR > 15 = 27.6 feet <br /> Se > 0.3 = 7.3 feet <br /> B > 5.0 = 0 feet