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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />June 29, 2010 <br />Christy Woodward <br />Denison Mines (USA) Corp. <br />1050 17th Street - Suite 950 <br />Denver, CO 80265 <br /> <br /> <br /> <br /> <br /> <br /> Bill Ritter, Jr. <br /> Governor <br />James B. Martin <br /> Executive Director <br />L Z010 Loretta E. Piheda <br /> <br />d?n' Director <br />piv+??n of R? <br />Slid 59101 <br />I,#ini <br />Re: Environmental Protection Plans for DMO Amendment Materials, Permit Numbers: <br />M-1977-285, Sunday Mine, Amendment AM-3; <br />M-1977-416, Carnation Mine, Amendment AM-1; <br />M-1978-039 HR, St. Jude Mine, Amendment AM-1; <br />M-1980-055 HR, Topaz Mine, Amendment AM-1; <br />M-1981-021, West Sunday Mine, Amendment AM-1; <br />Request for Operator's Acceptance of Amendment Requirements, for Adequacy of Amendments. <br />Dear Ms. Woodward, <br />The Division has completed its review of the most recent adequacy submittals, pertaining to the EPPs that <br />are being finalized for the five permits collectively referred to as the Sunday group of mines (all five permits <br />and amendments identified above). The five permits are each considered to be a DMO, and as such, each <br />permit is being amended to include an EPP. Your submitted EPP materials were combined into one set of <br />documents, though each permitted area is treated individually when appropriate. This letter includes general <br />comments which pertain to the grouped permits and separate comments for the individual permits, as <br />appropriate. <br />This letter describes the Division's acceptance of details of Denison's proposed plans, and it lists specific <br />details for which the Division still requires Denison's written acceptance, toward gaining approval of the <br />amendments. <br />Groundwater Monitoring Plan. <br />Some of the existing monitoring well data reflect somewhat elevated numbers, in particular, for arsenic, <br />molybdenum, and uranium. Since the history of surface and underground activities at the mines began many <br />years prior to Denison's involvement at the sites, Denison has the benefit of these high background numbers. <br />However, since Denison is the current permittee of these sites and is applying for approvals to continue <br />mining there, through these amendments, Denison has the responsibility for monitoring the onsite and <br />downgradient impacts. <br />COLORADO <br />DIVISION O F <br />RECLAMATION <br />MINING <br />- St- <br />SAFETY <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines