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SIGMA ALDRICH* <br />NPDES Permit #: C00047562 <br />Permit Name:Energy Fuels Resources Corp. <br />Zach Rogers <br />44 Union Blvd, Ste 600 <br />Lakewood, CO 80228 <br />NPDES Laboratory Performance Evaluation Report <br />RTC Laboratory Proficiency Testing Program <br />DMRQA 31 - Concluding 07/01/2011 <br />If you have any questions about your report, please contact Jennifer Jones at (307) 742 -5452 or email: reports @rt- corp.com. A copy of this report has been <br />sent to both your State and Regional Coordinator. This report shall not be reproduced except in full, with written approval of the Laboratory. A Laboratory <br />may not claim endorsement by ACLASS, A2LA, NELAC or any other federal agency. RTC is accredited to perform PT programs for the scope of <br />accreditation to ISO /IEC 17043 under ACLASS certificate AP -1469. RTC is accredited by A2LA to perform PT programs for the scope of accreditation to <br />ISO /IEC 17043 under A2LA Certificate # 2122.01. <br />This report may contain data that are not covered by the A2LA accreditation. <br />Analyzing Laboratory: Energy Laboratories Casper <br />EPA Labcode: WY00002 <br />2931 Soldier Springs Rd., Laramie, WY 82070 USA <br />1- 307 - 742 -5452 www.rt- corp.com <br />Analysis Method Result Assigned Value Acceptance Limits Evaluation <br />Arsenic, As EPA 200.7 752 pg /L 749 626 to 871 Acceptable <br />1010 10013408 <br />Arsenic, As EPA 200.8 744 pg/L 749 626 to 871 Acceptable <br />1010 10014401 <br />Arsenic, As EPA 6010B (1996) 741 pg /L 749 626 to 871 Acceptable <br />1010 10155609 <br />Arsenic, As EPA 6020 (1994) 744 pg /L 749 626 to 871 Acceptable <br />1010 10156000 <br />Arsenic, As SM 3114 B 21st ED (2005) 754 pg /L 749 626 to 871 Acceptable <br />1010 20059807 <br />Beryllium, Be EPA 200.7 762 pg /L 737 633 to 840 Acceptable <br />1020 10013408 <br />Beryllium, Be EPA 200.8 762 pg /L 737 633 to 840 Acceptable <br />1020 10014401 <br />Beryllium, Be EPA 6010B (1996) 689 pg /L 737 633 to 840 Acceptable <br />1020 10155609 <br />Beryllium, Be EPA 6020 (1994) 694 pg /L 737 633 to 840 Acceptable <br />1020 10156000 <br />Cadmium, Cd EPA 200.7 648 pg /L 638 548 to 729 Acceptable <br />1030 10013408 <br />Cadmium, Cd EPA 200.8 655 pg /L 638 548 to 729 Acceptable <br />1030 10014401 <br />Cadmium, Cd EPA 60108 (1996) 648 pg /L 638 548 to 729 Acceptable <br />1030 10155609 <br />Cadmium, Cd EPA 6020 (1994) 683 pg /L 638 548 to 729 Acceptable <br />1030 10156000 <br />Chromium, Cr (total) EPA 200.7 549 pg /L 529 460 to 597 Acceptable <br />1040 10013408 <br />Chromium, Cr (total) EPA 200.8 544 pg/L 529 460 to 597 Acceptable <br />1040 10014401 <br />Chromium, Cr (total) EPA 6010B (1996) 535 pg/L 529 460 to 597 Acceptable <br />1040 10155609 <br />