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DEERE & AULT <br />CONSULTANTS, INC. <br />January 17, 2018 <br />Mr. Elliott R. Russell <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Adequacy Review#3 Response TR-04; Pueblo East Pit, Permit File No. M-2000-041; <br />D&A Job No. CG-0212.010.00 <br />Dear Mr. Russell: <br />This letter response has been prepared by Deere &Ault Consultants, Inc. (D&A) to address the <br />adequacy items to the Division's satisfaction that are listed in your letter of January 16, 2017 to <br />John P. Ary. <br />26.In response to Adequacy Review Item #24, the Operator has defined the completion of <br />the slurry wall construction, however did not address the Division's recommendation <br />to conduct monthly monitoring for one year after completion of the slurry wall <br />followed by quarterly monitoring. Monthly monitoring for the first full year will help <br />precisely define the seasonal groundwater regime and understand immediate <br />groundwater mounding effects. Please address if the Operator intends to conduct <br />monthly monitoring for at least one year after the completion of the slurry wall before <br />sampling on a quarterly basis for the life of mine. <br />The Operator will conduct monthly monitoring for one year following completion of <br />the slurry wall. (See revised Appendix H) <br />27. Within the revised/updated Appendix E Groundwater Impact Analysis, the Operator <br />states if the depth of groundwater in the proposed Monitoring Well#8 approaches 4 <br />feet, the groundwater mounding mitigation drain will be designed and installed. <br />However, within Appendix H Groundwater Monitoring Plan, the Operator states this <br />to be 6 feet. Please correct this discrepancy and provide the trigger point at which the <br />drain will be designed and installed. <br />The trigger depth to groundwater is 6 feet. (See revised Appendix E) <br />600 S.Airport Road,Building A,Suite 205 <br />Longmont,CO 80503 <br />Phone: 303-651-1468•Fax: 303-651-1469