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Mr. Johnson <br /> Page 12 <br /> May 2, 2016 <br /> mining land use of pastureland. The Technical Revision narrative does not discuss changing <br /> the final grade of the pit walls. Please revise the Reclamation Plan to depict the approved <br /> final grade of the pit walls. If the Operator wishes to change the final grade to 2H:IV, then <br /> provide a technical justification for this change and explain how vegetation will be <br /> successfully established on this slope. <br /> 6. The Operator is proposing to mine deeper than what is currently approved, but does not <br /> specify the maximum depth in text. The Reclamation Plan Map shows the deepest part of the <br /> pit will be at an elevation of 6030'. Please confirm this is the maximum depth to which the <br /> pit will be mined. <br /> 7. The Operator is proposing to mine the pit deeper. In Technical Revision No. 1, the Operator <br /> states the limiting factor to the depth of mining is groundwater which occurs at <br /> approximately 52' below the ground surface. If the Operator contends the depth to <br /> groundwater is greater than the proposed maximum depth of the pit, then provide <br /> documentation which demonstrates the depth to groundwater in this area. Otherwise explain <br /> how the Operator will account for evaporative depletions associated with exposed <br /> groundwater. <br /> This concludes the Division's preliminary adequacy review of this Technical Revision. Please <br /> remember that the decision date for this Technical Revision is May 6, 2016. As previously <br /> mentioned, if you are unable to provide satisfactory responses to any inadequacies prior to this <br /> date, it will be your responsibility to request an extension of time to allow for continued review <br /> of this Technical Revision. If there are still unresolved issues when the decision date arrives and <br /> no extension has been requested, the Technical Revision will be denied. <br /> If you have any questions, please contact me at (303)866-3567 x8116. <br /> Sincerely, <br /> a � " -( <br /> Michael A. Cu�ghm <br /> Environmental Protection Specialist <br /> CC: Wally Erickson, DRMS <br /> Steve O'Brian, Environment, Inc. <br />