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Home My WebLink AboutDRC-2010-001081 - 0901a0688015adadDENISON MINES January 6, 2010 C^-^(6V-a3l^/ Denison Mines (USA) Corp. 1050 17th Street, Suite 950 Denver, CO 80265 USA Tel : 303 628-7798 Fax:303 389-4125 www.denisonmines.com Sent Via Electronic Mail (PDF) and Federal Express Dane L. Finerfrock, Executive Secretary Utah Radiation Control 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. UW370004 (the "GWDP") White Mesa Uranium Mill - Notice Pursuant to Part I.G. 1(a) Dear Mr. Finerfrock: The White Mesa uranium mill (the "Mill") completed its 4 Quarter, 2009 groundwater sampling the under the GWDP on October 12, 13, 14, 19, 20, 21, 27, 28, and December 1, 2009. Final analytical results were received on December 10, 2009. Under the GWDP it is intended that background groundwater quality will be determined on a well-by-well basis, as defined by the mean plus second standard deviation concentration. The Mill is currently in the process of working with the Utah Division of Radiation Control to establish background (including the mean plus standard deviation) for all of the constituents being sampled under the GWDP. Until background is established, the GWDP requires that constituent concentrations in each monitoring well shall not exceed the Groundwater Control Limits ("GWCLs") set out in Table 2 of the GWDP. Pursuant to Part I. G.1. a) of the GWDP, please take notice that the concentrations ofthe following constituents in the following monitoring wells sampled for the 4^*^ Quarter, 2009 exceeded their respective GWCLs in Table 2 of the Permit: Table 1 - GWCL Exceedances for the Quarter t MonitbringiWell * •:;L|(Wateicaa^i:i5 MW-3 (Class III) t|:^Constiiu|ntf:ri*- Selenium Thallium ,-;"*->GWGfi-^-H--: 25 1.0 .; 4 ^Sample ReMiic'T i 46.3 1.21 "ifi^Miitoriflg'Wfell^^ lll®a^#la(s|i|g; MW-5 (Class 11) MW-12 (Class 111) MW-14 (Class III) MW-14 Contd. MW-15 (Class III) MW-17 (Class III) MW-18 (Class II) MW-26 (Class III) MW-32 Class III) Ji#:X^ristituent^%¥ Manganese Uranium Manganese Uranium Selenium Uranium Uranium Thallium Uranium Manganese Uranium Chloroform Dichlormethane Cadmium Iron Manganese Nickel 200 15 400 15 25 15 15 0.5 7.5 400 15 35 2.5 2.5 5,500 400 50 riilsampif^gsniixfe :, iiv!:i'«.S.(41gAlj^.S,Sf^:l^'tl' 291 20.8 2,140 65.5 134 49.5 27.3 2.13 44.1 1230 29.6 750 5.9 3.04 7,980 5,240 54 Unless the compliance status for any constituents in any wells is determined otherwise by the Executive Secretary, the Mill will, pursuant to Part I.G.l.b)l) of the Permit, commence or continue, as the case may be, accelerated sampling of each of the foregoing constituents in its respective well on a monthly or quarterly basis, as applicable, and as set forth below. It should be noted that no new constituents at any well locations were added to the accelerated program as a result of this sampling event. Table 2 - Accelerated Monitoring Requirements as of January 6,2009 Monitoring - f Well '" (Water Class) MW-1 (Class II) 2 Constituent- r. • " = ^ 111'^ Tetrahydrofuran Manganese ' "^Normal' Frequency of Sampling Semi-Annual Semi-Annual Accelerated - Frequency of Sampling - Quarterly Quarterly Commencement, of Accelerated Monitoring- 4"" Quarter 2005 1" Quarter 2006 DENISO MINES J>U 1-Monit6rihg--=- :(W&teE:CIass)5 MW-3 (Class III) MW-5 (Class 11) MW-12 (Class III) MW-14 (Class III) MW-15 (Class III) MW-17 (Class III) MW-18 (Class II) MW-19 (Class II) 'r -Cohstittientv '^i Manganese Selinium Thallium Uranium Tetrahydrofuran Manganese Fluoride Tetrahydrofuran Manganese Uranium Manganese Uranium Selenium Uranium Uranium Thallium Thallium Uranium Manganese Fluoride Selenium Thallium Uranium Nitrate ;rrciSjo»m-al::::::^ JFifequencyibfp itfSampling: ;- Semi-Annual Semi-Annual Semi-Annual Semi-Annual Semi-Annual Semi-Armual Semi-Armual Semi-Aimual Semi-Annual Semi-Annual Quarterly Quarterly Semi-Aimual Semi-Annual Semi-Annual Semi-Annual Semi-Armual Semi-Annual Semi-Armual Semi-Armual Semi-Aimual Semi-Annual Semi-Annual Semi-Annual itAcpekTaJfdv yEreqiiefaty df;; ni-Saniphng™** Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Monthly Monthly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly ; GdriinienGeiiient' ; :tof;Accelef ated *^ iKMdiiitfinn^Ci 1''Quarter 2006 3'"'' Quarter 2006 4"" Quarter 2005 4"" Quarter 2005 3'" Quarter 2006 4"" Quarter 2005 4"" Quarter 2005 I'' Quarter 2006 4'" Quarter 2005 4"" Quarter 2005 June 2005 June 2005 4"" Quarter 2005 4"^ Quarter 2005 4"^ Quarter 2005 f'Quarter 2006 4"" Quarter 2005 4"" Quarter 2005 January, 2008 1" Quarter 2006 4* Quarter 2005 1'' Quarter 2006 4'" Quarter 2005 1''Quarter 2009 DENISO MINES J>U Monitoring > Well IWater Clai) MW-26 (Class III) MW-32 (Class III) Gijnstituent Manganese Uranium Chloroform Dichloromethane Cadmium Iron Manganese Nickel Gross Alpha ,; ;Ndf riialll' .jFirequenc/^ Sampling Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Accelerated Frequency of^] Sampling^ Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly Commencement s^oiAccelerated,,., ftl^iitoring ^ June 2005 June 2005 June 2005 September 2005 June 2005 June 2005 June 2005 June 2005 March 2007 If you have any questions or require any further information, please contact the undersigned. Yours truly. jteven D. Landau DENISON MINES (USA) CORP. Manager, Environmental Affairs cc: Ron Hochstein Harold Roberts David Frydenlund David Turk DENISON MINES