DRC-2010-002342 - 0901a068801703ee

DRC-20iG 002342
DENISO
MINES
March 9, 2010
Mi
Received
MAR 20^0
Division of
Radir-iion Coii(rcf
,,1
Denlson Mines (USA) Corp.
1050 17th Street, Suite dSO
Denver, CO 80265
USA
Tel: [phone]
Fax: [phone]
www.denisonmines.com
VIA PDF AND FEDERAL EXPRESS
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: State of Utah Ground Water Discharge Permit No, UGW370004 (the
White Mesa Uranium Mill - Notice Pursuant to Part LG.l(a)
Dear Mr. Finerfrock:
'GWDP")
The White Mesa uranium mill (the "Mill") perfonned momlily accelerated groundwater
monitoring of MW-14. MW-26 and MW-32 on January 12 and 13. 2010 under the March 17,
2008 version of the GWDP (the "Previous GWDP"), prior to its revision on January 20, 2010.
The final analytical results of these samplings are contained in an analytical report dated
February 5, 2010.
Pursuant to Part l.GT .a) of the Previous GWDP, please take notice that the concentrations of the
following constituents in the following monitoring wells sampled on January 12 and 13 of 2010
exceeded their respective ground water compliance levels ("GWCLs") in Table 2 of the Previous
GWDP:
Table 1 - GWCL Exceedances for January Under the Previous GWDP
^ Monitoring iWell
(Water Cla^s).:
MW-14 (Class III)
MW-26 (Class III
Constituent : V'
^ -^ •-•.-•,• •
Manganese
irranium
Manganese
Uranium
GWCL in Previous i
GWDP •. \ ••'"M."
.(ug/L)- i •
400
15
400
15
Sample^^ • Result
(ug/Df^;;
U990
65.4
1,290
58.6
Moniioring Well^
(Water Class)
MW-32 Class III)
Constituent
Chloroform
Dichloromethane
Iron
Manganese
Nickel
GWCL in Previous
GWDPl ^?^?
(u^y--;. -, :::•••-••;
35
15
5,500
400
50
Sample Result
(ug/L) •':%
1,500
32
7,300
5,420
52
As confirmed via email correspondence on February 16 and 17, 2010, as a result of the issuance
of the modified GWDP on January 20, 2010 (the "Current GWDP"), which sets revised GWCLs,
all requirements to perform accelerated monitoring under Part I.G.I of the Previous GWDP
ceased effective on January 20, 2010. and the effect of the issuance of the Current GWDP was to.
create a "clean slate" for all constituents in all wells going forward.
This means that no accelerated monitoring is required under the Current GWDP for the first
quarter of 2010. Accelerated monitoring for subsequent quarters will depend on the application
of Part T.G.I of the Current GWDP to results from groundwater samples required to be taken in '
the first quarter of 2010 and front any subsequent sample results. The notice requirements of
Part l.G.l.a) of the Current GWDP will apply to any exceedances observed in groundwater
samples required to be taken in the first quarter of 2010 and from any subsequent sample resuhs.
Accordingly, the January 12 and 13 accelerated monitoring samples were not required to be
performed under die Current GWDP; hence this is a Notice under the Previous GWDP, and the
results are compared to the GWCLs in the Previous GWDP.
If you have any questions or require any further information, please contact the undersigned.
Yours My,
D(Md/Cr pyydenlund
Vice President, Regulatory Affairs and Counsel
cc\ Ron Hochstein
Harold Roberts
Jo Arm Tischler
David Turk
OENISO
MINES
Mi