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• www.dwgylab.com Helena, MT 877-472 -0711 • Billings, IF 001-735-4489 • Casper, WY 888 - 235 -1515 <br />f1° 1i"a' 't Gillette, WY 866- 686 -7175 a Rapid City, SO 886- 672 -1225 • College Station, TX 868 -691 -2218 <br />QA /QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 10/18/13 <br />Project: Schwartz GW 9/24/13 S27176 & S27177 Work Order: C13090929 <br />r <br />Analyte Count Result Units RL ° /.REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E903.0 Batch: RA226 -6869 <br />Sample ID: C13091022 -001 FMS Sample Matrix Spike Run: BERTHOLD 770- 1_130930B 10/07/13 22:36 <br />Radium 226 31 pCi /L 106 70 130 <br />Sample ID: C13091022 -001 FMSD <br />Radium 226 <br />Sample ID: MB- RA226 -6869 <br />Radium 226 <br />Radium 226 precision ( ±) <br />Radium 226 MDC <br />Sample ID: LCS- RA226 -6869 <br />Radium 226 <br />Sample Matrix Spike Duplicate <br />31 pCi /L <br />3 Method Blank <br />-0.1 pCi /L <br />0.08 pCi /L <br />0.2 pCi /L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Laboratory Control Sample <br />11 pCi /L <br />Run: BERTHOLD 770- 1_130930B 10/07/13 23:36 <br />104 70 130 1 7 21.6 <br />Run: BERTHOLD 770- 1_130930B 10/07/13 23:36 <br />U <br />Run: BERTHOLD 770- 1_130930B 10/07/13 23:36 <br />100 80 120 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 19 of 23 <br />