DRC-2009-003913 - 0901a068801403b7

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DENISON^.
MINES
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Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax:[phone]
www.denisonmlnes.com
September 3, 2009
VIA PDF AND FEDERAL EXPRRESS
Mr. Dane L. Finerfrock
Co-Executive Secretary
Utah Water Quality Board
Department of Environmental Quality
168 North 1950 West
PO Box 144810
Salt Lake City, Utah 84114-4810
Re: Nitrate Contamination Investigation and Corrective Action Plan, White Mesa
Uranium Mill near Banding, Utah. Stipulated Consent Agreement
Dear Mr. Finerfrock:
Reference is made to the Stipulated Consent Agreement, dated August, 2008, between Denison
Mines (USA) Corp. ("DUSA") and the Utah Water Quality Board (the "Agreement"), relating to
the nitrate contamination investigation and corrective action plan at the White Mesa Mill.
As discussed with members of Division of Radiation Control staff on Monday August, 31, 2009,
DUSA has drilled 10 nitrate monitoring wells to date, and performed some sampling of those
wells, without giving notice to the Executive Secretary under item 6B of the Agreement. This
failure to give notice was due to an oversite on DUSA's part.
Specifically, DUSA drilled and completed the following wells at the following times:
• TWN-1, TWN-2, TWN-3 and TWN-4 during the period Febmary 3 to Febmary 5, 2009;
and
• TWN-5, TWN-6, TWN-7, TWN-8, TWN-9 and TWN-10 during the period August 17 to
August 20, 2009.
DUSA has performed the following sampling on those wells for nitrate:
• TWN-1, TWN-2, TWN-3 and TWN-4 were sampled for nitrate on Febmary 6, 2009 and
again on July 21, 2009;
• TWN-5, TWN-6, TWN-7, TWN-8, TWN-9 and TWN-10 were sampled for nitrate on
August 27, 2009.
DUSA also sampled for chloride in all of the foregoing wells at the same times the nitrate
samples were collected.
DUSA has not peiformed any aquifer permeability testing on any ofthe nitrate wells to date.
DUSA is currently reviewing the results for the August 27 samples for the six wells that were
installed in August to determine if any further nitrate monitoring wells need to be installed.
DUSA plans to sample all of the nitrate investigation wells again in September and once during
the fourth quarter of 2009.
DUSA will provide the 10-day notice to the Executive Secretary as required under item 6B ofthe
Agreement prior to:
• Any further sampling, including the planned sampling events for September and the
fourth quarter of 2009;
• The drilling and completion of any additional nitrate investigation wells; and
• All aquifer permeability testing on the nitrate investigation wells.
We are sorry for this oversite. Denison personnel have been focusing on completing the nitrate
investigation within the time frames stipulated in the Agreement and have had their sites aimed
at the end product, the Contaminant Investigation Report. Unfortunately, DUSA overlooked the
10-day notice requirement. This will not happen again.
Please let me know if you have any questions or we can provide any further information to you.
Your^ytrulyy
DflViq C. Frydenlund
Vice President, Regulatory Affairs and Counsel
cc: Ron F. Hochstein
Harold R. Roberts
Steven D. Landau
David E. Turk
DENISO
MINES
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