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www.ewolab.com Helena, MT 871472 -0711 - Billings, MT 800- 7354489 - Casper, WY 888 -235 -0515 <br />Asa"WEw&ft=A=IW Gillette, WY 866 -686 -7175 - Rapid City, So 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 SW 05/08/13 S26872 <br />Analyte <br />Count Result Units <br />Method: RA -05 <br />Sample ID: LCS- 228 -RA226 -6637 <br />Laboratory Control Sample <br />Radium 228 <br />7.8 pCi /L <br />Sample ID: MB -RA226 -6637 <br />3 Method Blank <br />Radium 228 <br />0.06 pCi /L <br />Radium 228 precision ( ±) <br />1 pCi /L <br />Radium 228 MDC <br />2 pCi /L <br />Sample ID: C13050363 -001 FDUP <br />3 Sample Duplicate <br />Radium 228 <br />-0.37 pCi /L <br />Radium 228 precision ( ±) <br />0.99 pCi /L <br />Radium 228 MDC <br />1.7 pCi /L <br />- The Sample and the Duplicate are both below the MDC, the RPD is acceptable. <br />Sample ID: 013050387- 004AMS <br />Sample Matrix Spike <br />Radium 228 <br />20 pCi /L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />U - Not detected at minimum detectable concentration <br />Report Date: 06/06/13 <br />Work Order: 013050363 <br />RL ° /.REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: RA228 -4416 <br />Run: G5000W_130513A 05/15/13 23:13 <br />81 80 120 <br />Run: G5000W 130513A <br />Run: G5000W_130513A <br />Run: G5000W_130513A <br />102 70 130 <br />ND - Not detected at the reporting limit. <br />R - RPD exceeds advisory limit. <br />05/15/13 23:13 <br />U <br />05/15/13 23:14 <br />620 354 UR <br />05/15/13 23:14 <br />Page 23 of 26 <br />