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NR <br />FC*0\Nj* <br />James E. Stover <br />14K■l 4107:w =1 oxe7 <br />Division of Reclamation, <br />Mining and Safety <br />Uepartment of Natural ReSOUTCeS <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />J. E. Stover and Associates, Inc. <br />2352 N 7th St. Ste B <br />Grand Junction, CO 81501 -8168 <br />July 1, 2014 <br />Re: North Thompson Creek Mine (Permit No. C- 1981 -025) <br />Technical Revision No. 28 (TR -28) <br />Adequacy Review No. 2 <br />Dear Mr. Stover, <br />On June 24, 2014, the Colorado Division of Reclamation Mining and Safety (Division) received Minrec's <br />TR -28 Adequacy Response 41. This response addresses the questions raised by the Division in its June <br />10, 2014 letter. <br />In the Division's June 10, 2014 letter, questions were raised about the mine discharge meeting effluent <br />limitations before leaving the permit boundary. Minrec's response to these questions is to expand the <br />permit boundary to include an additional pond, therefore containing all the discharge water within the <br />permit boundary. The Division determined that the permit boundary expansion of 7.5 acres can be done <br />as an incidental boundary change under the current TR -28. The operator was required to re- publish the <br />TR -28 public notice with the permit boundary change announcement. <br />The Division has the following comments: <br />Rule 4.05.2(1) requires discharge from underground workings to meet the effluent limitations of <br />Rule 4.05.2 before leaving the permit area. Please provide a revised CDPS permit or <br />acknowledgement from the Water Quality Control Division (WQCD) of the spillway <br />reconfiguration. <br />DRMS: The addition of the refuse pond will increase the holding capacity of water within the <br />permit boundary which will decrease the likeliness of water discharging to North Thompson <br />Creek. The refuse pond is also down gradient from the currently approved discharge point. If <br />Minrec plans to discharge from the refuse pond, a new or modified NPDES permit must be <br />obtained. <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 />coto <br />t��j <br />I �* * ic <br />1976 4L <br />