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www.ertergylab.com Helena, MT 877472 -6711 • Billings, MT 860- 735 -4469 • Casper, WY 888- 235 -0515 <br />Au"atiaxahur Uwe 1132 Gillette, WY 866 - 606 -7175 • Rapid City, SO 868 -672 -1225 • College Station, TX 888 - 690 -2218 <br />` QA /QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Report Date: <br />12/10/13 <br />Schwartz SW 11/6/13 S27253 S27255 S27256 <br />Work Order: <br />01 31 1 0305 <br />`Project: <br />Analyte <br />Count Result Units <br />RL %REC <br />Low Limit High Limit RPD <br />RPDLimit Qual <br />Method: RA -05 <br />Batch: RA228 -4564 <br />Sample ID: LCS- 228 -RA226 -6955 <br />Laboratory Control Sample <br />Run: TENNELEC- 3_131112F <br />11/20/13 12:47 <br />Radium 228 <br />8.8 pCi /L <br />105 <br />80 120 <br />Sample ID: MB -RA226 -6955 <br />3 Method Blank <br />Run: TENNELEC -3 131112F <br />11/20/13 12:47 <br />Radium 228 <br />1 pCi /L <br />U <br />Radium 228 precision ( ±) <br />1 pCi /L <br />Radium 228 MDC <br />2 pCi /L <br />Sample ID: C13110305- 001HMS <br />Sample Matrix Spike <br />Run: TENNELEC- 3_131112F <br />11/20/13 12:47 <br />Radium 228 <br />17.8 pCi /L <br />116 <br />70 130 <br />Sample ID: C13110305 -001 HMSD <br />Sample Matrix Spike Duplicate <br />Run: TENNELEC- 3_131112F <br />11/20/13 12:47 <br />Radium 228 <br />16.9 pCi /L <br />110 <br />70 130 5.1 <br />36 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 25 of 30 <br />