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Memorandum in Response to Notice of Determination of Designation Mining Operation (DMO); DRMS File Numbers <br />M-1977-416, M-1978-039 HR, M-1977-285, M-1980-055 HR, M-1981-021 and M-1977-032. <br />• Meteoric Water Mobility Procedure on three representative waste rock samples <br />from each mine (nine samples total) to evaluate their potential to produce other <br />toxic-forming materials. <br />• Submission of engineered drainage reports that show protection of surface water <br />quality from engineered best management practices at the mine sites. <br />• A review of existing geotechnical information, to assess the potential for impact <br />to groundwater from the waste rock areas, will be conducted and reported in <br />hydrogeologic reports. <br />• Soils testing will be conducted on samples from undisturbed and unaffected areas <br />at the toes of the waste rock areas (three samples for each :mine, nine samples <br />total) to show background conditions and provide data for transport models. This <br />information will be provided in reports to the Division. <br />A brief discussion of the proposed Phase 2 EPP preparation is provided in this <br />memorandum for each category outlined in the Colorado;Hard Rock/Metal Mining Rule <br />6, Sections 6.2.40 (1) through (19). Denison proposes that the Phase 2 proposal be <br />revisited based on the Phase 1 data. This would occur within six months from approval <br />of the Phase 1 process. <br />Please provide Denison with your comments at your earliest convenience and call Christy <br />Woodward, Environmental Coordinator°(303) 389-4136 (on technical matters) or David <br />C. Frydenlund, Vice President Regulatory Affairs and Counsel-(3:03) 389-4130 (on legal <br />or regulatory matters), with any questions or concerns. <br />10 <br />