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DATE: February 1, 2008 <br />TO: Russ Means <br />FROM: Allen Sorenson <br />RE; Review of Adequacy Responses, Energy Fuels Resources Corp., <br />Whirlwind Mine, File No. M-2007-044 <br />The Division of Reclamation, Mining, and Safety (DRMS) engineering staff has completed a review of thf: <br />following aspects of the adequacy response that was submitted January 15, 2008: <br />1. The design storm for diversion ditch design. <br />2. The reclamation cost estimate for bulkheads in the underground mine. <br />3. The ground water characterization plan for the proposed monitoring well. <br />The DRMS agrees that the probable maximum precipitation event for the location of the mine is not feasible <br />as a design criterion, and accepts the Applicant's proposal to install ditches that will pass the 100-year storm <br />event. <br />The DRMS met with Energy Fuels consultants Lewicki and Associates twice in early January 2008 to <br />discuss costing for underground bulkheads, and largely reached agreement on estimating methods and <br />inputs. The estimates contained in the January 15, 2008 submittal are acceptable for reclamation bonding <br />purposes. <br />The Applicant proposes four samples from the new monitoring well over one year for baseline <br />characterization; DRMS will require a minimum 8-samples, relatively equally spaced, over 1.25 years. <br />The Applicant has provided permeability testing results for a sample of the top rim of the Salt Wash <br />Member of the Morrison Formation. It is important to recognize that the permeability of the intact rock <br />does not control ground water velocity in the formation, where primary ground water movement is likely to <br />be fracture controlled. DRMS will require ongoing ground water evaluations as mining progresses, and i:n <br />particular is concerned with the potential for surface emergence of mine water at the PR Spring or <br />elsewhere. <br />c:~acs files\My Documents 4-19-06 thru\whirlwind second adequacy.doc <br />