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www.energylab.com Helena, MT 871-472-0711 • Billings, MT 800-i35-4489 • Casper, WY 888-235-0515 <br />W=10, A Erulhaaslx, rY3t Gillette, WY 866-686-7175 • Rapid City, SO 888-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program SW <br />Report Date: 11 /29/10 <br />Work Order: C10101013 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E903.0 Batch: RA226-4959 <br />Sample ID: 010101041-008DMS Sample Matrix Spike Run: BERTHOLD 770-1 101103B 11/11/10 11:45 <br />Radium 226 18.6 pCi/L 115 70 130 <br />Sample ID: C10101041-008DMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-1 101103B 11/11/10 11:45 <br />Radium 226 20.1 pCi/L 125 70 130 7.7 24.6 <br />Sample ID: MB-RA226-4959 3 Method Blank Run: BERTHOLD 770-1101103B 11/11/10 13:18 <br />Radium 226 -0.1 pCi/L U <br />Radium 226 precision (±) 0.09 pCi/L <br />Radium 226 MDC 0.2 pCi/L <br />Sample ID: LCS-RA226-4959 Laboratory Control Sample Run: BERTHOLD 770-1_101103B 11/11/10 13:18 <br />Radium 226 11 pCi/L 141 70 130 S <br />- LCS response is outside of the acceptance range for this analysis. Since the MB, MS, and MSD are acceptable the batch is approved. <br />Method: E903.0 Batch: RA226-4992 <br />Sample ID: C10101108-001CMS Sample Matrix Spike Run: BERTHOLD 770-2 101110E 11/23/10 16:15 <br />Radium 226 16 pCi/L 93 70 130 <br />Sample ID: 010101108-001CMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-2_101110E 11/23/10 16:15 <br />Radium 226 18 pCi/L 103 70 130 10 23.5 <br />Sample ID: MB-RA226-4992 3 Method Blank Run: BERTHOLD 770-2_101110E 11/23/10 16:15 <br />Radium 226 -0.06 pCi/L U <br />Radium 226 precision (±) 0.08 pCi/L <br />Radium 226 MDC 0.2 pCi/L <br />Sample ID: LCS-RA226-4992 Laboratory Control Sample Run: BERTHOLD 770-2_101110E 11/23/10 16:15 <br />Radium 226 8.4 pCi/L 107 70 130 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />U - Not detected at minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />S - Spike recovery outside of advisory limits. <br />Page 24 of 32