DRC-2010-003601 - 0901a068801960f7

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DENISON
MINES
VIA PDF AND EXPRESS DELIVERY
June 14,2010
Dane L. Finerfrock, Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
168 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4810
Re: White Mesa Mill Annual Tailings Sampling -
Notice Pursuant to Utah Groundwater Discharge Permit UGW370004,
Dear Mr. Finerfrock:
Oanison Mines Corp.
0428 S. Highway 101, PO Box 809
Blanding, UT 84511
USA
Tel : [phone]
Fax : [phone]
www.d«nisoiiniine9.com
Denison Mines (USA) Corp. is providing this to notify the Utah Division of Radiation Control of the White
Mesa Mill's tailings, slimes drain, and leak detection system sampling as required by the Utah Groundwater
Discharge Permit (the "GWDP") UGW370004. The sampling event is scheduled for the week beginning
Tuesday August 2, through approximately Monday August 8, 2010.
The Mill staff plan to sample the following locations, consistent with the GWDP and the Tailings Slimes Drain
Sampling Program (the "Sampling Program").
Sampling Area Locations
Tailings System Cells Cell #l,Cell#3, Cell #4A.
Slimes Drains Cell 2 Slimes Drain
Leak Detection Systems ("LDSs") Any cell LDS with sufficient liquid present
As indicated in the Sampling Program, slimes drain samples are only collected from cells which have been
removed from service and are undergoing dewatering procedures. For this sampling event, slimes drain
samples will only be collected from Cell #2. Also as indicated in the Sampling Program, LDS samples are only
collected at locations with sufficient free liquid to permit sampling. At the present time, the Mill anticipates
that a sample may be collected from the LDS standpipe on Cell #1 and Cell #4A.
If you have any questions or require further assistance, please contact Mr. Richard Bartlett, Mill Manager; Mr. David
Turk, Radiation Safety Officer; or Ryan Pahner at [phone].
Yours very truly,
i/ Jo Ann Tischler
Director, Compliance and Permitting
DENISON MINES (USA) CORP.
cc: Richard Bartlett
David C. Frydenlund
Ron Hochstein
Ryan Palmer
Harold Roberts
David Turk
DUSA Central Files
DENISO
MINES