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www.erce dab.com Helena, MT 871472 -0711 - Billings, SAT 800- 7354489 - Casper, WY 888- 235 -0515 <br />- f�cNlirna.S+mc. rest 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 5/16/13 S26976- S26978 & S26980- S26983 <br />Analyte Count Result Units <br />Method: RA -05 <br />Sample ID: LCS- 228 -RA226 -6647 <br />Laboratory Control Sample <br />Radium 228 <br />9.3 pCi /L <br />Sample ID: MB -RA226 -6647 <br />3 Method Blank <br />Radium 228 <br />0.2 pCi /L <br />Radium 228 precision ( ±) <br />1 pCi /L <br />Radium 228 MDC <br />2 pCi /L <br />Sample ID: C13050657- 006FMS <br />Sample Matrix Spike <br />Radium 228 <br />15 pCi /L <br />Sample ID: C13050657- 006FMSD <br />Sample Matrix Spike Duplicate <br />Radium 228 <br />19 pCi /L <br />Qualifiers: <br />RL - Analyte reporting limit <br />MDC - Minimum detectable concentration <br />Report Date: 06/12/13 <br />Work Order: C13050679 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: RA228 -4421 <br />Run: G542M_130522B 05/30/13 18:36 <br />115 80 120 <br />Run: G542M_130522B 05/30/13 18:36 <br />U <br />Run: G542M_130522B 05/30/13 18:36 <br />93 70 130 <br />Run: G542M_130522B 05/30/13 18:36 <br />119 70 130 23 38.3 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 28 of 37 <br />