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• www.energylab.com Helena, INT B77-472-0711 • Billings, h1T 800-735-4489 . Casper, WY 888-235-0515 <br />T _ , w AiulyNcs/frcellmceSinca 1951 ' Gillette, WY 866-GBS-7175 • Rapid City, SO 888-672-1225 • College Station, T% 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Mine <br />Analyte <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-4777 <br />Radium 228 <br />Sample ID: MB-RA226-4777 <br />Radium 228 <br />Radium 228 precision (±) <br />Radium 228 MDC <br />Sample ID: 010080899-003CMS <br />Radium 228 <br />Sample ID: C10080899-003CMSE <br />Radium 228 <br />Count Result Units <br />Laboratory Control Sample <br />8.58 pCi/L <br />3 Method Blank <br />0.8 pCi/L <br />1.0 pCi/L <br />2 pCi/L <br />Sample Matrix Spike <br />15.5 pCi/L <br />Sample Matrix Spike Duplicate <br />17.5 pCi/L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Report Date: 09/27/10 <br />Work Order: C10080962 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: RA228-3360 <br />Run: TENNELEC-3_100907D 09/13/10 11:42 <br />105 70 130 <br />Run: TENNELEC-3_100907D 09/13/10 11:42 <br />U <br />Run: TENNELEC-3_100907D 09/13/10 11:42 <br />95 70 130 <br />Run: TENNELEC-3_100907D 09/13/10 11:42 <br />108 70 130 12 37 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 33 of 44