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RULE 2 PERMITS <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 />2.05.3 (6) Overburden <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 />Overburden Monitoring Program <br />As discussed during the permitting of the South Taylor Mining Area (PR -02), as long as the total <br />percentage does not exceed 15% of the total truck/shovel sequence for each drill hole, suitability should <br />not be an issue based upon the upper overburden seam quality and the expected dilution of lower <br />overburden materials (more likely to exhibit elevated parameter levels) through mixing as part of the <br />logical mining sequencing of overburden and coal removal in the Collom area. <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 />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=0feet <br />Sat <25 or >80 = 45.35 feet <br />Mo > 1.0 = 0 feet <br />Total Drill Hole Depth = 354.3 feet <br />Total Percentage of unsuitable material: <br />SAR = 27.6 feet/354.3 feet = 7.7900084674% <br />Se = 7.3 feet/354.3 feet = 2.0606007903% <br />B = N/A <br />Sat = 45.35 feet/354.3 feet = 12.799887101% <br />Mo = N/A <br />Drill Hole C-04-25 <br />Unsuitability range in feet: <br />SAR > 15 = 69.6 feet <br />Se > 0.3 = 15.15 feet <br />B>5.0=0feet <br />Sat <25 or >80 = 83.8 feet <br />Collom — Rule 2, Page 79 Revision Date: 12/30/16 <br />Revision No.: TR -108 <br />