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www.energyiab.com <br />Acatyiicel ErceUence Since 1952 <br />_...._......... _-.... <br />_..--- <br />Helena, tdT 877-472-0711 *Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />Gillette, WY 866-686-7175 -Rapid City, SD 888-672-1225 *College Station, TX 888.690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Project: Schwartzwalder Mine Monitoring Program-Surface Wat <br />Analyte Count Result Units <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-5030 Laboratory Control Sample <br />Radium 228 7.61 pCVL <br />Sample ID: MB-RA226-5030 3 Method Blank <br />Radium 228 0.4 pCi/L <br />Radium 228 precision (±) 0.8 pCi/L <br />Radium 228 MDC 1 pCirL <br />Sample ID: C701107'87-002EMS Sample Matrix Spike <br />Radium 228 15.6 pCi/L <br />Sample ID: 010110787-002EMSD Sample Matrix Spike Duplicate <br />Radium 228 13.9 pCi/L <br />Report Date: 01/05/11 <br />Work Order: C10110787 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: RA228.3509 <br />Run: TENNELEC-3_101123D 12103/10 11:27 <br />99 70 130 <br />Run: TENNELEC-3_101123D 12/03/10 11:27 <br />U <br />Run: TENNELEC-3_101123D 12/03/10 11:27 <br />110 70 130 <br />Run: TENNELEC-3 101123D 12/03/10 11:27 <br />99 70 130 11 36.3 <br />Qualifiers: <br />RL - Analyle reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum delectable concentration U - Not detected at minimum detectable concentration <br />Page 24 of 30