DRC-2011-006529 - 0901a0688023c242

June 7, 2011
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax: [phone]
www.denisonmines.com
VIA E-MAIL AND OVERNIGHT DELIVERY
Rusty Lundberg, Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4810
C-201
Re: State of Utah Ground Water Discharge Permit No. UGW370004 White Mesa Uranium Mill -
Notice of Plan to Install Weil Pumps
Dear Mr. Lundberg:
By this letter, Denison Mines (USA) Corp. requests the Executive Secretary's approval for the installation of
dedicated pumps in three monitoring wells at the White Mesa Mill as described below.
New groundwater monitoring wells MW33, MW34, and MW35 were installed on the dike of Cell 4B on
September 2, 2010, as required by Part I.H.4 of the Mill's Groundwater Discharge Permit ("GWDP") dated
June 17, 2010. Because MW33 was determined to be a dry well and MW34 produced insufficient water for
sampling, DRC revised the GWDP on February 15, 2011, in part, to address these hydrogeologic findings.
As a result, the February 15, 2011 GWDP removed requirements to sample MW33 and MW 34. (However
groundwater levels are monitored in MW34).
New groundwater monitoring wells MW36 and MW 37 were subsequently installed on the dike of Cell 4B on
April 26 and 25, 2011, respectively, to replace MW33 and MW34 as monitoring wells.
MW-35 has been sampled during the third and fourth quarter 2010 and first quarter of 2011 by means of a
portable pump. MW36 and MW37 are undergoing initial development and have not yet been sampled.
To be consistent with the rest of the groundwater monitoring program (all other point of compliance wells are
sampled using dedicated pumps), and to minimize the opportunity for cross-contamination from re-use of a
portable pump, the Mill wishes to install dedicated pumps within the screened intervals of each of these three
wells as described below. The proposed pumps are of identical type and size as dedicated pumps in all other
wells in the Mill's groundwater monitoring program.
N:\Notices\06.07.11 notice to R Lundberg well pumps.doc
Letter to Mr. Rusty Lundberg
June 7, 2011
Page 2
Tablel
Summary of Proposed Well Information
Well Pump Type Maximum Flow Rate
MW-35 QED Well-Wizard
Dedicated Monitoring
System - Low Flow
Bladder Pump
0.217 gpm
MW-36 QED Well-Wizard
Dedicated Monitoring
System - Low Flow
Bladder Pump
0.217 gpm
MW-37 QED Well-Wizard
Dedicated Monitoring
System - Low Flow
Bladder Pump
0.217 gpm
The As-Built Report for MW33, 34, and 35, depicting the screened interval for each of these wells, was
submitted on October 15, 2010. The As-Built Report for MW36 and MW37 will be submitted on or before
June 30, 2011.
Part I.E.11 of the Mill's GWDP requires that "before any modification of groundwater monitoring or analysis
procedures, methods of equipment, the Permittee must obtain prior written approval from the Executive
Secretary." By this letter, Denison is requesting the Executive Secretary's approval for installation of the
above-listed pumps.
Denison will continue to sample all of the above named wells by means of a bailer until we receive DRC
approval for pump installation.
Please contact the undersigned if you have any questions or require any further information.
Yours very truly,
DENISON MINES (USA) CORP.
Jo Ann Tischler
Director, Compliance and Permitting
cc: Rich Bartlett
David C. Frydenlund
Phil Goble
Loren Morton
Harold R. Roberts
David E. Turk
Central files
DENISO
MINES