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ENERGYLABORATORIES,INC. •2393Salt Creek Highway(82601)•P.O.Box 3258 • Casper, WY82602 <br /> Toll Free 888 235 0515 • 307235 0515 • Fax 307.234.1639 • casper@energylab.com•www energylab.com <br /> LABORATORY ANALYTICAL REPORT <br /> Client: Denison Mines(USA)Corp Report Date: 04/02/09 <br /> Project: West Sunday Mine Collection Date: 03/17/09 08:00 <br /> Lab ID: C09030572-003 DateReceived: 03/18/09 <br /> Client Sample ID: West Sunday#4 Matrix: Aqueous <br /> MCU <br /> Analyses Result Units Qualifiers RL QCL Method Analysis Date/By <br /> RADIONUCLIDES-TOTAL <br /> Gross Alpha 17.5 pCi/L U E900.0 03/31/09 00:50/cgr <br /> Gross Alpha precision(t) 23.8 pCi/L E900.0 03/31/09 00:501 cgr <br /> Gross Alpha MDC 37.8 pCi/L E900.0 03/31/09 00:50/cgr <br /> Gross Beta -20 pCi/L U E900.0 03/31/09 00:50/cgr <br /> Gross Beta precision(t) 32.4 pCi/L E900.0 03/31/09 00:50/cgr <br /> Gross Beta MDC 55.0 pCi/L E900.0 03/31/09 00:50/cgr <br /> DATA QUALITY <br /> A/C Balance(t 5) -4.45 % Calculation 04/02/09 08:58/kbh <br /> Anions 109 meq/L Calculation 04/02/09 08:581 kbh <br /> Cations 100 meq/L Calculation 04/02/09 08:58/kbh <br /> Solids,Total Dissolved Calculated 7250 mg/L Calculation 04/02/09 08:58/kbh <br /> TDS Balance(0.80-1.20) 0.960 Calculation 04/02/09 08:58/kbh <br /> Report RL-Analyte reporting limit. MCL-Maximum contaminant level. <br /> Definitions: QCL-Quality control limit. ND-Not detected at the reporting limit. <br /> MDC-Minimum detectable concentration U-Not detected at minimum detectable concentration <br />