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ENVIRONMENT, INC. PAGE 3 <br /> DECEMBER 1 2, 2014 <br /> A slope stability analysis of a sediment pond with 10 feet of water and a 20 foot <br /> tall highwall was modeled using DRMS recommended strength parameters. See <br /> Figures 5 A 6 in the attached report. <br /> 10. Please provide the corresponding slope stability analysis data for the Deere&Ault analysis <br /> to allow the Division to duplicate the analysis for verification purposes. <br /> This data is contained in the legends on Figures 1 thru 5 and Figure 6 contains cross <br /> sections for each of the sides analyzed. Electronic copies of the Geo Studio fifes <br /> are available upon request. Please contact Derek Foster at Deere and Ault 303- <br /> 651-1468 for the data. <br /> 11. Please provide the Division with the slope stability monitoring plan to be used during mining <br /> and reclamation activities at the site. <br /> Once mining reaches the setbacks around the perimeter of the pit, monthly <br /> evaluations will be made to make sure there are no slope stability failures happen- <br /> ing. <br /> The current decision deadline for this application is December-24,2014 and Albert Frei&Sons, <br /> Inc. would prefer to keep with this timetable if at all possible. I will place a copy of this packet <br /> and the new Geotechnical Analysis in the Adams County Clerks file copy and provide proof of <br /> placement. If you have more questions or need more information please call me at(303)423- <br /> 7297. <br /> Sincerely, <br /> '5�I-a-e-je, <br /> Stevan L. O'Brian <br /> Environment, Inc. <br /> cc Albert Frei & Sons,Inc. -Ben Frei <br /> Tyler O'Donnell-via e-mail <br /> file <br />