Laserfiche WebLink
RULE 2 PERMITS <br />Unnecessary compaction will be avoided by keeping all but essential traffic off the stockpiled areas. <br />Topsoil signs will identify topsoil stockpiles. Contamination of the stockpiles will be eliminated by the <br />careful selection of sites that are distant from the areas where actual mining activities are occurring. <br />Drainage ways and areas near spoiling and blasting will be avoided where 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 under the Production Methods Section found at the beginning of Section 2.05.3. The spoil <br />handling monitoring plan parameters for the operation can be found below. <br />Overburden Monitoring Program <br />Tables 2.04.6 -6 and 2.04.6 -7 summarize oberburden analyses from the Collom expansion area based on <br />marginal and unsuitable criteria found on Table 2.04.6 -5 (WDEQ -LQD). Descriptive information <br />regarding the exploration test boring program under sections labeled "Evaluating Geochemical Properties <br />of Overburden" and "Exploration Test Boring Results Summary" provide additional support to the <br />discussions below. <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 />reclamation final regraded overburden areas will exceed the suitability range for overburden criteria (as <br />described within Table 2.04.6 -5) is low. This demonstration was completed by showing the total <br />percentage of unsuitable material as it relates to the drill hole data shown in Volume 17, Exhibit 6 Item 9 <br />for the sources of the majority of overburden to be generated in the area. A review of the analysis <br />spreadsheet for drill hole C -04 -04 shows that the source of all elevated SAR levels (> 15.0) originates <br />from the bottom 121 feet of overburden from the bore hole. Normal overburden haulage and sequencing <br />will ensure this material will not contribute to elevated SAR levels on the reclaimed surface post- mining <br />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 = 0 feet <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 />ul me -LIF /:1 <br />Collom —Rule 2, Page 100 Revision Date: 9/28/11 <br />Revision No.: PR -03 <br />