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• - www.ewcylab.com ( Helena, MT 877- 472 -0711 • Billings, MT 800- 735 -4489 • Casper, WY 888 -235 -8515 <br />An~ EwaAimaShme IM J Gillette, WY 866 -666 -7175 • Rapid City, SD 886- 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: Schwartz GW 5/20/13 S26987 & S26988 <br />Analyte <br />Count Result <br />Units <br />Method: E903.0 <br />Sample ID: LCS -RA226 -6654 <br />Laboratory Control Sample <br />Radium 226 <br />13 <br />pCi /L <br />Sample ID: C13050760- 002GMS <br />Sample Matrix Spike <br />Radium 226 <br />21 <br />pCi /L <br />Sample ID: C13050760- 002GMSD <br />Sample Matrix Spike Duplicate <br />Radium 226 <br />23 <br />pCi /L <br />Sample ID: MB -RA226 -6654 <br />3 Method Blank <br />Radium 226 <br />-0.03 <br />pCi /L <br />Radium 226 precision ( ±) <br />0.2 <br />pCi /L <br />Radium 226 MDC <br />0.3 <br />pCi /L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Report Date: 06/13/13 <br />Work Order: C13050760 <br />RL ° /.REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: RA226 -6654R <br />Run: BERTHOLD 770- 2_130604A 06/11/13 11:31 <br />117 80 120 <br />Run: BERTHOLD 770- 2_130604A 06/11/13 15:19 <br />93 70 130 <br />Run BERTHOLD 770- 2_130604A 06/11/13 15:19 <br />98 70 130 5.7 22.5 <br />Run: BERTHOLD 770-2130604A 06/11/13 15:19 <br />U <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 20 of 24 <br />