DRC-2010-002777 - 0901a0688017a6a6

State of Utah
GARYR HERBERT
Governor
GREG BELL
Ueutenant Govemor
Department of
Environmental Quality
Amanda SmJlh
E.xeciilivc Director
DIVISION OFRADIATION CONTROL
Tjanc L. Finerfrock
Director
April 8,2010
CERTIFIED MAIL
RETURNED RECEIPT REOUESTED
Mr, David C. Frydenlund
Vice President, Regulatory Affairs and Counsel
Denison Mines (USA) Corp. (DUSA)
Independence Plaza, Suile 950
1050 Seventeenth Street
Denver, CO 80265
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CERTIFIED MAlLu- RECEIPT
(DamesUc Mail Only; No Insurance Coverage Provided)
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BE- CHLOROFORM CONT INVEST ^SUBMITTAL OF PLAN OF ACTION AND WORK
SCHEDULBWHITE MESA URANIUM MILL
-CONDITIONAL APPRV LTR
DATE: APRIL 4, SOIO'DH
Return Receipt Fee (Endorsement Required]
Restricted Dellyeiy Fee
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MR DAVID 0 FRYDENLUND ^^.,_„
VICE PRESIDENT AND GENERAL COUNSEL
DENISON MINES (USAt CORP (DUSA)
1050 17TH STREET STE 950
DENVER CO 80265
SUBJECT; Chloroform Contamination Investigation. Chloroform Concentrations Exceeding
the Groundwater Quality Standard in Monitor Well TW4-6. Submittal of a Plan of
Acfion and Work Schedule. White Mesa Uranium Mill, - Conditional Approval
Letter.
Dear Mr. Frydenlund:
The Division of Radiation Control (hereafter "DRC") has reviewed the February 18, 2010 Plan of
Acfion and Work Schedule (hereafter "Plan") that was submitted by Dennison Mines (USA) Corp.
(hereafter "DUSA") to have hydraulic containment of the chloroform concentrations at 7^4-6.
The submitted Plan is in response to a February II, 2010 conference call with DRC and DUSA
that discuss DUSA's December 31, 2009 proposed plan and acfion and schedule. The conclusions
reached in this conference call were confirmed in an email dated February 11, 2010 from DRC to
DUSA. Based on our review the Plan is condifionally approved with the following modificafions:
1. Modify Item 3 of the Plan to read (added wording is underlined deleted wording is strikeout):
Denison will install new chloroform monitoring well TW4-26 at the location indicated on
Figure I attached to Hydro Geo Chem's February 16, 2010 letter report. This well and all
other new monitorins wellfs) will he pennanent and constructed in accordance with UAC R
317-6-63(l)(6)and shall comply with Part I.F.6 ofthe DUSA Ground Water Discharge Permii
No. UGW370004.
TW4-26 mid anv other monitorins welKs) installed downsradient ofTW4-6 will be sampled
quarterly for the analytical parameters listed in section 4 in Appendix A ofthe White Mesa
Uranium Mill Ground Water Monitorins Ouaiitv Assurance Plan, same constiluenis as the
I6fi North 1950 Wesl • Sail Lake Cily. UT
Mailmg .Address P O. BO-K 144850-Sail Lake Cil>. UT 841144850
Telephone (801,1 516-4250 • Fv^y. (801 j 513-4097 • T D.D. (SOI) 5.ifi-4414
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other chlorofonn monitoring wells.
2. Modify Hem 4 ofthe Plan to read (added wording is underiined deleted wording is strikeout):
Denison will aquifer le.st TW4-4, T\V4-6, and Ty\'4-26, on or before August 1, 2010, lo
a) Calculate penneabilities ond hydraulic conductivities:
b) Calculate local groundwater velocities; and
c) Detennine an endent pumping system at each pumping well location.
Such aquifer testing will be described in a report that will be submitted lo the Executive
Secretary on or before Sepiember 30, 2010. Should Executive Secretary require additional
new monitor wellis) be installed down sradieni ofTW4-6 an aquifer test to calculate items in
a and b above will be described in a report that will be subniitted to the Executive Secretaiy
wilhin 60 calendar days after well installation.
3. Modify Item 6 to read:
Afier submittal ofthe 4*'^ quarter, 2010 chloroform monitoring report, if the Execufive
Secretary determines for any reason that pumping TW4-4 is not effecfively reducing the
chloroform concentration in TW4-6 DUSA will begin pumping TW4-6 wilh in 30 days of
written notice from the Execuiive Secretary.
4. Remove actions in Item 7 as a result of the wording changes in Item 6.
5. Remove aclions in Item 9 as a result of the wording changes in Item 6.
Tn our conference call on April 7, 2010 it was agreed that within 30 days ofthe receipt ofthis
letter DUSA would provide, in electronic PDF format, both a final copy of the Plan and a copy of
the Plan in redline strikeout format showing the above modifications requested. If this was nol
your understanding please respond in wrifing with in three (3) calendar days of receiving this
letter. Thank you for your coopeiation in this maitcr. If you have any questions call Dean
Henderson at 1-801-536-0046.
UTAH WATER QUALITY BOARD
Dane L Finanrock
Co-Execufive Secretary
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