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' www.energylab.com Helena MT B77-472-0711 . Billings, MT 800-735-4489 • Casper WY 888-235-051 <br />' bieryricel ExcelloweSlnce 195? Gillette, WY 865-686-7175 • Rapid City, SO 8BB-672-1225 * College Station, TX 888-690-2219 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Proiect: Schwartzwalder Mine <br />Analyte Count Result Units <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-5080 Laboratory Control Sample <br />Radium 228 6.5 pCi/L <br />Sample ID: MB-RA226-5080 3 Method Blank <br />Radium 228 -0.02 pCi/L <br />Radium 228 precision (±) 0.6 pCi/L <br />Radium 228 MDC 1 pCi/L <br />Sample ID: C10120711-001GMS Sample Matrix Spike <br />Radium 228 14 pCi/L <br />Sample ID: C10120711-001GMSD Sample Matrix Spike Duplicate <br />Radium 228 14 pCi/L <br />Report Date: 01 /19/11 <br />Work order: C10120711 <br />RL %REC Low Limit High Limit RPD RPDLimit Dual <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />DdLLA 1. nnccv-.i.i?Run: TENNELEC-3_101222A 12/28/10 13:12 <br />91 70 130 <br />Run: TENNELEC-3_101222A 12/28/10 13:12 <br />U <br />Run: TENNELEC-3_101222A 12/28/10 13:12 <br />96 70 130 <br />Run: TENNELEC-3_101222A 12/28/10 13:12 <br />98 70 130 2.7 33.9 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 19 of 23