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www.enerdab.com <br />AaOi WEUNNwa9ree IM <br />Helena, MT 677472-0711 • Billings, MT 800-7354489 • Casper,.WY 888-235-0515 <br />Gillette, WY 886-686-7175 • Rapid City, SD 888-672-1225 • Wage Station, TX 888-680-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 11/22/10 <br />Project: Schwartzwalder Wate r Monitoring Program SW Work Order: C10100592 <br /> <br />EA, alyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: RA-05 Batch: RA228-3464 <br />Sample ID: LCS-228-RA226-4934 Laboratory Control Sample Run: TENNELEC-3_101025B 11/03/10 10:16 <br />Radium 228 8.0 pCi/L 94 70 130 <br />Sample ID: MB-RA226-4934 3 Method Blank Run: TENNELEC-3_101025B 11/03/10 10:16 <br />Radium 228 1 pCi/L U <br />Radium 228 precision (±) 1.0 pCi/L <br />Radium 228 MDC 2 pCi/L <br />Sample ID: C10100569-002DMS Sample Matrix Spike Run: TENNELEC-3_101025B 11/03/10 10:16 <br />Radium 228 15 pCi/L 86 70 130 <br />Sample ID: C10100569-002DMSD Sample Matrix Spike Duplicate Run: TENNELEC-3_101025B 11/03/10 10:16 <br />Radium 228 15 pCi/L 83 70 130 2.6 41.2 <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 29 of 36