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www.awdab.com I ? h 472-0711 • Billings, MT 800-735-4459 • Casper, WY 818-235-1515 <br />Aiuplfal?aNwcaSAW Im 5 175 ! Rapid City, SO 558-672-1225 • College Station, TX 815-610-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 12/09/10 <br />Project: Schwartzwalder Water Monitoring Program Discharge Work Order: C10110384 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: RA-05 Batch: RA228-3500 <br />Sample ID: LCS-228-RA226-5020 Laboratory Control Sample Run: TENNELEC-3_101119A 11/29/10 15:24 <br />Radium 228 6.15 pCi/L 82 70 130 <br />Sample ID: MB-RA226-5020 3 Method Blank Run: TENNELEC-3_101119A 11/29/10 15:24 <br />Radium 228 0.214 pCi/L U <br />Radium 228 precision (±) 0.517 pCi/L <br />Radium 228 MDC 0.853 pCi/L <br />Sample ID: C10110384-001CMS Sample Matrix Spike Run: TENNELEC-3_101119A 11/29/10 15:24 <br />Radium 228 14.8 pCi/L 100 70 130 <br />Sample ID: C1 0110384-001 CMSD Sample Matrix Spike Duplicate Run: TENNELEC-3_101119A 11/29/10 15:24 <br />Radium 228 12.9 pCi/L 87 70 130 14 32.7 <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration U - Not detected at minimum detectable concentration <br />Page 6 of 9