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Helena, MT 577-4724711 *Billings, MT 100-735-4489 • Casper, WY 819-236-1'515 <br />www.aier®tlab.twm <br />AaayCwtErAaderaaslbra flst 614ii; W.Y 866-686-7175 • Rapid City, SD 881-672-1226 • College Station, TX 881-610-2211 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 09/16/10 <br />Project: Schwartzwalder Water Monitoring Program Work Order: C10080790 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br /> Batch: RA228-3342 <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-4751 Laboratory Control Sample Run: TENNELEC-3_100826A 09/03/10 12:17 <br />Radium 228 8.11 pCi/L 106 70 130 <br />Sample ID: MB-RA226-4751 3 Method Blank Run: TENNELEC-3_100826A 09/03/10 12:17 <br />Radium 228 0.3 pCi/L U <br />Radium 228 precision (±? 0.7 pCi/L <br />Radium 228 MDC 1 pCi/L <br />Sample ID: C10080893-001CMS Sample Matrix Spike Run: TENNELEC-3_100826A 09/03/10 12:17 <br />Radium 228 16.6 pCi/L 101 70 130 <br />Sample ID: 010080893-001CMSD Sample Matrix Spike Duplicate Run: TENNELEC-3_100826A 09/03/10 12:18 <br />Radium 228 15.9 pCi/L 97 70 130 4.2 33.6 <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-4758 Laboratory Control Sample <br />Radium 228 7.48 pCi/L <br />Sample ID: MB-RA226-4758 3 Method Blank <br />Radium 228 0.5 pCi/L <br />Radium 228 precision (±? 0.7 pCi/L <br />Radium 228 MDC 1 pCi/L <br />Sample ID: 010080864-001DMS Sample Matrix Spike <br />Radium 228 15.8 pCi/L <br />Sample ID: 010080864-001DMSD Sample Matrix Spike Duplicate <br />Radium 228 16.4 pCi/L <br />Batch: RA228-3341 <br />Run: TENNELEC-3_100827B 09/07/10 13:26 <br />94 70 130 <br />Run: TENNELEC-3_100827B 09/07/10 13:26 <br />U <br />Run: TENNELEC-3_100827B 09/07/10 13:26 <br />83 70 130 <br />Run: TENNELEC-3_100827B 09/07/10 13:26 <br />87 70 130 3.9 30.1 <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 27 of 37