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5TATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 COLORADO <br />Phone: (303) 866 -3567 D I VI 5 1 ON OF <br />FAX: (303) 832 -8106 RECLAMATION <br />MINING <br />SAFETY <br />June 3, 2013 <br />John W Hickenlooper <br />Governor <br />Ms. Connie Davis <br />Mike King <br />Land Advisor Executive Director <br />Aggregate Industries Loretta E Pneda <br />1707 Cole Blvd, Suite 100 Director <br />Golden, Colorado 80401 <br />Re: Hazeltine Mine (Permit M- 2004 -031) <br />Technical Revision 2 (TR -02), Technical Adequacy Review <br />Dear Ms. Davis: <br />Please add the following adequacy comment to the five comments that we sent to you in our letter of June 3, <br />2013. <br />6) The Agridrain is proposed as a permanent structure. For a post bond release scenario in which the <br />water level in the Hazeltine water storage reservoir eventually drops from its maximum elevation, <br />please describe or provide design drawings that demonstrate the discharge from the Agridrain will not <br />cause excessive erosion on the inslope of the reservoir downslope from the Agridrain. <br />If you have questions, please contact me at (303) 866 -3567, extension 8129. <br />Sincerely, <br />erhan Keffelew <br />Environmental Protection Specialist <br />cc: Tony Waldron <br />Tom Kaldenbach <br />Office of <br />Mined Land Reclamation Office of <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />