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Mixing and Mitigation of Unsuitable Overburden Material. In the Wedge mining area, zones of <br />unsuitable material were identified at thirteen sample locations and are documented by <br />parameter and sample interval in Appendix 6-5. Effective mitigation measures will include <br />avoidance, ameliorating reclamation techniques, and blending, dilution, and/or burial by normal <br />overburden handling. The Sage Creek/V11olf Creek overburden samples were collected from only one <br />locale near the proposed Sage CreekfWolf Creek mining area and do not statistically represent the <br />actual overburden characteristics of the entire proposed mining area. The analysis results were used in <br />conjunction with the overburden assessment from the Yoast Mine to estimate reclamation suitability of <br />the Sage Creek/Vllolf Creek overburden material. <br />The Yoast mine permit, Tab 21, indicated no majpr or minor concerns for suitability associated with the <br />Wadge underburden. The most significant concern that is applicable to the new mine was the high <br />acid potential in the Wolf Creek overburden just above the coal ILWCOV). An excerpt from the Yoast <br />permit is provided below. <br />Excessive ABPleve/s were identilied in 28.9 percent of the Wo/f Creek overburden at Site 2373E, <br />most/y in the 20 to 35-loot zone above the coo/seam. Typica/overburden handling wi// eltective/y <br />bury much of this strata in the centre/ portion of the spoil profile. However based upon previous <br />. information from the adjacent Seneca // Mine, acid mine spoil may occasions//y be identilied at the <br />surface of Tina/graded spoil These areas, identified by the regraded spoil monitoring program, wf// <br />be buried with a minimum of three feet of suitab/e spoil pdor to soil replacement. ' <br />The recent analytical testing from borehole WWCU-24 did not indicate the high acid potential near the <br />Wolf Creek coal but identified boron, lead and nickel with marginal suitability. Mining and reclamation <br />procedures are expected to mitigate any unsuitability conditions that may occur during mining. <br />Unsuitable surface conditions will be avoided by blending (diluting) and burying the material as <br />discussed in the Mixing and Mitigation of Unsuitable Overburden section in Tab 21, Minesoil <br />Reconstruction. These mitigative measures, listed in Appendix 6-5, are discussed in further <br />detail in Tab 21, Minesoil Reconstruction. <br />OualitV Control and Duplicate Samples, Quality control is an important part of the soil and <br />spoil monitoring program. One aspect of this quality control program is to have the primary <br />laboratory facility complete duplicate analyses on five to ten percent of the total samples and <br />on field-split blind samples. IML completed duplicated analyses on 3 of the 25 samples from <br />the southern mine block. IML also completed duplicate analyses on one field-split blind sample <br />from the southern mine block. The duplicate analyses, presented on the enclosed laboratory <br />reports in Appendix 6-3, were very comparable with the original samples. Variation between <br />• the original and duplicate analyses data was not significant enough to change the suitability <br />classification of any sample. <br />3~ 2 ~~ ~~ ~ <br />o..,.:...a nr ,nom <br />