DRC-2011-002269 - 0901a0688020aad0

DRC-2011-002269
MINES
February 24,2011
VIA FEDERAL EXPRESS AND PDF
Rusty Lundberg,
Co-Executive Secretary
Utah Water Quality Board
Utah Department of Enviromnental Qualitv
195 North 1950 West
P.O. Box 144850
Sah Lake City, UT 84114-4850
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax:[phone]
www.denisonmines.com
Re:
V^e^M^ir'"^^^^^ UGW370004
^^^~Mm . Addendum ta Februa^ 14, 2011 Notice Pursuant to
Dear Mr. Lundberg:
Mill's Groundwater Discharge P^tt X '^^^^^ 2010yersion of the
comparison to the GWCLs wi recS Sn/C^ii i^^^
^iiT:^i^;>i::^^^:^ P™, .0 OWOP Pa« ,.o.Ka,
stated, regarding the g^ss alpha resZntj^it MwS^
ofG.ossAlpHaZiTmfTn - 'i'"'"'''^^
analytical
- al. of the reported r«u,.s for
on the imtial suspect ftoss^ATp^Ss^S^l ? ? ZuT'^ ^Ipha Levels. Based
appeared to .ce^ *eir res;'S:;S^™™^
N:\Notices\GW Exceedence notices\02.14.11 Notice\02.24.11
Page 1
Addendum to Notice_of_Exceedance_GW_Q4_2010.docx
apparent exceedances were highlighted in green on the Table 1 exceedance summary provided
with the Notice.
As indicated in the Notice, due to the suspect quality of the reported results for Gross Alpha,
Denison required the laboratory to reanalyze the samples and confirm that the new reported
analyses meet the Mill's Quality Assurance Plan requirement that laboratory QC blanks are free
of contamination from the analyte(s) being reported. The corrected analytical results for MW-25
MW-26, and MW-27 are shown below. Based on the corrected data, MW-2, MW26, and MW-
27 did not exceed their respective GWCLs and no other groundwater wells exceeded their
respective GWCLs for Gross Alpha during the fourth quarter. MW-2, MW-26, and MW-27 will
therefore not need to be placed on an accelerated monitoring schedule.
Corrected Gross Alpha Results for Q4 2010
Well Rejected Analytical
Result (as shown in
green on table 1 of
Exceedance Notice)
(pCi/L)
Reanalyzed Result
(pCi/L)
GWCL (pCi/L)
MW-2 3.5 0.7 3.2
MW-26 6.4 2.2 4.69
MW-27 2.4 1 2.0
The attached Table 1 shows the corrected list of wells with exceedances which will be placed on
the accelerated monitoring list.
Ifyou have any questions or require any fiirther information, please contact the undersigned.
Yours truly,
Jo Ann Tischler
Director, Compliance and Permitting
cc: David C. Frydenlund
Ron Hochstein
Harold Roberts
David Turk
Ryan Palmer
Kathy Weinel
Central Files
Page 2
N:\Notices\GWExceedencenotices\02.14.11 Notice\02.24.11 Addendum to Notice_of_Exceedance_GW_Q4_2010.docx
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