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ENERCYL4BORATOR/ES, INC. -2393 Salt Creek Highway (82601) • P.O. Box 3258 • Casper, WY82602 <br />Toll Free 888 235 0515 - 307.235.0515 - Fax 307.234.1639 - casper0energy1ab.com • www.energylab.com <br />?l?sIT?3?1 <br />LABORATORY ANALYTICAL REPORT <br />lient: 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 /> <br />Analyses <br />Result <br />Units MCU <br />Qualifiers RL QCL Method <br />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 00:50 / 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 08:58 / kbh <br />Cations 100 meq/L Calculation 04/02109 08:58 / kbh <br />Solids, Total Dissolved Calculated 7250 mg/L Calculation 04/02109 08:58 / kbh <br />TDS Balance (0.80 -1.20) 0.960 Calculation 04/02/09 08:58 / kbh <br />• <br />?eport RL - Anaiyte reporting limit. MCL - Maximum contaminant level. <br />eflnitlons: QCL - Quality control limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration U - Not detected at minimum detectable concentration