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WKWffeWabcom Helena, mT 877-472-0711- Billings, MT 800-735-4489 - Casper, 6W' 888-235-0515 <br />M:?tCdExra9isastaee t862 J Urette, lwC 866486-7115 a Rapid City, SD 888472-1225 - College Station, iX 888-691-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 04/25/11 <br />Project: Schwartz-GW 03/30/11 S25671 & S25672 Work Order: 011030940 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E903.0 Batch: RA226-5276 <br />Sample ID: C11040039-001 EMS Sample Matrix Spike <br />Radium 226 13 pCi/L <br />Sample ID: C1 1040039-001 EMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-1_110404A <br />Radium 226 7.6 pCi/L 60 70 130 52 <br />- Spike response is outside of the acceptance range for this analysis. Since the LCS and the MS are acceptable the batch is approved. <br />Sample ID: MB-RA226-5276 3 Method Blank Run: BERTHOLD 770-1_110404A <br />Radium 226 -0.10 pCi/L <br />Radium 226 precision (±) 0.076 pCi/L <br />Radium 226 MDC 0.19 pCi/L <br />Sample ID: LCS-RA226-5276 Laboratory Control Sample Run: BERTHOLD 770-1_110404A <br />Radium 226 6.1 pCi/L 98 85 115 <br />Run: BERTHOLD 770-1110404A 04/11/11 17:51 <br />102 70 130 <br />04/11/11 21:14 <br />28 SR <br />04/11/11 21:14 <br />U <br />04/11/11 21:14 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />S - Spike recovery outside of advisory limits. <br />ND - Not detected at the reporting limit. <br />R - RPD exceeds advisory limit. <br />U - Not detected at minimum detectable concentration <br />Page 19 of 24