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!COLORADO <br />I <br />Division of Reclamation, <br />Mining and Safety <br />1 Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />June 13, 2016 <br />Ben Moline <br />Coors Energy Company <br />P.O. Box 467 <br />Golden, CO 80402 <br />RE: Keenesburg Strip Mine, Permit C-1981-028 <br />DRMS Adequacy Review of Permit Renewal Application No. 7 (RN7) <br />Dear Mr. Moline: <br />The Division has completed its preliminary review of for a permit renewal (RN7) for the Keenesburg Strip <br />Mine in accordance with Rule 2.08.5. The Division is currently reviewing Technical Revision No.46 <br />(TR46), which may adequately address some of the below items. However, at this time TR46 is still <br />under review. The Division has identified the following items of concern or comment: <br />• Please ensure that the information related to Identification of Interests, including start dates and <br />end dates, is current in the permit. <br />2.04.8 Baseline Climatological Information <br />Permit section 2.04, Environmental Resources presents climate information. References cited date <br />from 1941, 1974, 1978. More recent, updated climate information is available. <br />Site hydrology was updated in 1994 as per Technical Revision Drainage Control Plan II, (TR28). <br />This section of the rules is adequately addressed in the permit with the exception of: <br />• As the site is moving into reclamation, climatological data encompassing more current <br />information up to the present should be evaluated and presented. <br />• Should updated climate information yields increased runoff to permanent ponds and ditches, <br />then the design capacities of these structures must be reevaluated to assure adequate passing of <br />precipitation events. <br />2.04.10(1)-(5) Vegetation Information <br />The information required by Rule 2.04.10(4) is not contained in Section 2.04.10(4) of the permit and has <br />been removed from the permit text. According to the permit, this information was removed and filed with <br />TR30. The Division's files for TR30 were reviewed and this information could not be located. <br />of-�O�o\ <br />ti 0 <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />