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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 />DATE: February 16, 2010 <br />TO: Bob Oswald <br />FROM: David Bird <br />RECEIVED <br />FEB 1: 2010 <br />Division of Reclamation, <br />Mining & Safety <br />RE: ? Review of Environmental Protection Plan for Denison Mines (USA) Corp <br />COLORADO <br />D I V I S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />AW4,- I V, ? <br />Van 4 Shaft Project ./ v'FER 04 GT #1. q?--032_ <br />Rkr <br />The Division of Reclamation, Mining, and Safety (DRMS) geochemist has completed a review of the <br />Response to Technical Adequacy Comments for the Environmental Protection Plan (EPP) for the Denison <br />Mines (USA) Corp. Van 4 Shaft Project. DRMS has the following additional adequacy concerns: <br />Attachment A, Comment 1 <br />Denison: In the context of questioning whether uranium should be regarded as a toxic-forming material due <br />to its presence at low concentrations, the Applicant states "Denison selected the BLM risk management <br />criteria (RMC)(BLM 2004) to be appropriate criteria for the site based on future land use for the mines." <br />DRMS response: The BLM publication "Risk Management Criteria for Metals at BLM Mining Sites, <br />Technical Note 390 rev., October 2004," contains no reference information for uranium. If this is the same <br />document to which the Applicant refers, please elaborate on how the information in this document was <br />extrapolated to risk management of uranium at the Denison sites. <br />Addendum to the Hydrologic Evaluation <br />DRMS Comments/questions: <br />Please provide a figure depicting the 3-dimensional nodal discretization of the UNSAT-H model. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines