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Ms. Lynn Mayer Shults <br /> October 11, 2016 <br /> Page 2 <br /> D&A also performed a slope stability analysis for the each of the four cross sections(Sections A- <br /> D)shown on Figure 1 using the proposed reclaimed slope configuration. The reclaimed slope <br /> was assumed to be a slope of 3:1 (horizontal to vertical). The distance to the nearest site feature, <br /> (i.e. property line, fence line, utility, etc.)is shown on each figure. Material properties for the <br /> reclamation slope fill was added to the model and is based on our professional experience with <br /> earthfill for similar projects. Slope/W was used to analyze the stability of the reclaimed slopes. <br /> The minimum factors of safety for the four reclaimed slope cross sections ranged between 1.63 <br /> and 1.67. A reclaimed slope with a factor of safety greater than 1.5 is considered acceptable. <br /> None of the sections analyzed came within 30 feet of affecting the nearest site feature with the <br /> reclaimed slope constructed. <br /> CONCLUSION <br /> Based on the information supplied by Environment, Inc. it is the opinion of Deere and Ault that <br /> the proposed mining and subsequent reclamation work at the L.G. Everist Carbon Valley Mine <br /> should not propose any significant threat during mining to any of the known nearest site features. <br /> If you have any questions or comments please call. <br /> Sincerely, <br /> DEERE& AULT CONSULTANTS, INC. <br /> Derek H. Foster, P.E. <br /> Project Manager <br /> DHF:sp <br /> Attachments <br /> cc: Steve O'Brian <br /> Q\0201 LG Everist\0201.029 Carbon Valley\Slope Stabdity\Carbon Valley Slope StabilityLtr Doex <br />