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www.energyla0.tom i Helena, MT 877.472-0711 - Billings, 141800-735-4489 a Casper, WY 808-235-0515 <br />: n AnalydcalF.rca9ecoWaco 1952 J Gillette, WY 866-686-7175 • Rapid City, SC 88B-672-1225 -College Station, TX 888-SBD-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 01/05/11 <br />Project: Schwartzwalder Mine Monitoring Program-Surface Wat Work Order: C10110690 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: RA-05 Batch: RA228-3505 <br />Sample ID: LCS-228-RA226-5026 Laboratory Control Sample Run: TENNELEC-3_101122B 12101110 16:13 <br />Radium 228 72 pCi/L 92 70 130 <br />Sample ID: MB-RA226-5026 3 Method Blank Run: TENNELEC-3-101122B 12/01!10 16:13 <br />Radium 228 0.5 pCi/L U <br />Radium 228 precision (t) 0.5 pCi/L <br />Radium 228 MDC 0.8 pCVL <br />Sample ID: C10110449-012AMS Sample Matrix Spike Run: TENNELEC-3_101122B 12/01/10 16:13 <br />Radium 228 16 pCi/L 106 70 130 <br />Sample ID: 010110449-012AMSD Sample Matrix Spike Duplicate Run: TENNELEC-3--1011228 12/01/10 16:13 <br />Radium 228 16 pCi/L 101 70 130 4.9 34.7 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected al the reporting limit. <br />U - Not detected al minimum detectable concentration <br />Page 28 of 39