2013-06-14_REVISION - M1977285 (3)

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OFENERGYFUELS June 10, 2013 Mr. Jamie Blair Bureau of Land Management Tres Rios Public Lands Office 29211 Hwy. 184 Dolores, CO, 81323 Energy Fuels Resources (USA) Inc. 225 Union Blvd. Suite 600 Lakewood, CO, US, 80228 303 - 974 -2140 www.energyfuels.com Mr. Bob Oswald Colorado Department of Natural Resources 691 County Road 233, Unit A2 Durango, Colorado 81301 i4 Re: Sunday Mine Complex Proposed Low Flow Groundwater Sampling Response to CDRMS Comments // Dear Bob and Jamie, 1h — t9 3 fi g 57 We reviewed Bob's comments on the Sunday Mine Complex Low Flow Groundwater Sampling Memo and made revisions to the memo in order to improve clarity, particularly when referring to the different well identifiers. Attached please find Revision 1 of that memo. Below in red we prepared direct responses to Bob's comments and references to what changes were made. From: Oswald - DNR, Robert [ mailto :robert.oswald()state.co.usl Sent: Thursday, May 30, 2013 11:09 AM To: Andrea Reither Cc: Frank Filas, P.E; Blair, James J Subject: Re: Sunday Mine Complex Proposed Low Flow Groundwater Sampling Hi Andrea - I've reviewed the packet you sent, and have the following comments /questions: 1. Cover letter, page one states that there are 5 monitoring wells proposed, though there are actually 6. Could you confirm that? This was a typographical error and has been fixed. 2. Table 1 shows that pump depth in MW -SUN3 is 562 ft. Mention is made in same table about function of the proposed Blatypus pump at 500 ft. Could you explain if there's an issue with a pump depth limit, or some other obstacle? Blatypus has a pump that can be placed up to 3,000 feet BGS. If we decide to use the Blatypus system to sample MW -SUN3, we will discuss the placement depth with the manufacture and use the deeper pump if necessary. A row has been added to Table 1 reflecting the availability of this deeper placement pump. 3. Attachment A, monitoring well diagrams, one is clearly labeled for MW -SUN2, but the other seems to be MW-SUN 1, but label doesn't contain that name. An MW -SUN I label has been added to the appropriate well diagram in Appendix A. 4. To avoid confusion (maybe just mine) I'd suggest consistency in referencing each of the monitoring wells, since there are various ways they are referred to in the packet (West Ambient Well is MW -SUN3; West Intermediate Well is MW -SUN2; East Compliance Well is MW -SUN1, etc.). Unfortunately, when this project began, we did not choose brief well names that could be plotted,easily on a map or Sunday Mine Complex 1 Revision 0 V',INCColorado Sunday Complex Baseline Siudies'.G-undwateri Well Sampling Pla Drilling(WateMemolSwday PmpasedfowF lowSamplingResponseLetter.doc June 2013