DRC-2010-001321 - 0901a0688015e7d2

DENISOlv^i
MINES
- L. U X ^L. W
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel : [phone]
Fax:[phone]
www.denlsonmines.com
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January 19,2010
Sent Via Electronic Mail (PDF) and Federal Express
Dane L. Finerfrock, Executive Secretary
Utah Radiation Control Board
Utah Department ofEnvironmental Quality
168 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4810
Re: White Mesa Uranium Mill: UDEQ Inspection of Ground Water Module 65
October 19, 2009-Response to Request for Information
Dear Mr. Finerfrock:
In accordance with UDEQ's October 19, 2009 inspection findings and its request for additional
information dated December 12, 2009 (which was received by Denison on December 16, 2009)
the foUowing information is provided:
UDEQ Request for Information 1.
DRC noted that ihe SPCC Plan requires tank to soil potential measurements. It was unclear
whether this item was being undertaken. Please provide information to clarify the intent of these
measurements and whether or not the measurements are currently conducted.
Denison Response:
Upon review of the SPCC Plan Denison notes that tank to soil potential measurements are
referred to at Section 1.10 of the Plan within the context of a record that would be maintained
should such measurements actually become necessary. Soil to tank potential measurements are
utilized to test cathodic protection systems for underground tanks and piping. Denison does not
currently employ cathodic protection systems and, therefore, such testing is not required at this
time. However, if in the future such systems were to be utilized these records would be retained
in accordance with Section 1.10 of the SPCC Plan.
UDEQ Request for Information 2.
Please clarify the protocols to determine whether used oil generated at the White Mesa facility is
determined contaminated (i.e. lle.(2) byproduct material) and disposed of in the tailings cell or
determined uncontaminated (or not lle.(2) byproduct material.)
Denison Response:
Used oil at the White Mesa Mill that has the potential for having been contaminated by
radioactive material (such as that which may be generated by cleaning of machinery in the shop
and received by the floor drain and conveyed to the used oil tank) is disposed onsite in the Mill
tailings impoundment. Oils that are intemal to plant machinery (such as vehicle engines) are not
subject to contamination potential and can be drained for offsite recycling. Currently, the oil that
is retained in the used oil tank has received floor drain materials from the shop and is to be
disposed in the tailings impoundment as 1 le.(2) byproduct material.
If you have any questions or require any further information, please contact the undersigned.
Yours truly.
Steven D. Landau
DENISON MINES (USA) CORP.
Manager, Environmental Affairs
cc: Ron Hochstein
Harold Roberts
David Frydenlund
David Turk
DENISO
MINES
JOI