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wnv.energylab.con ( Helena, MT 877-472-0711 + Billings, 141 800-135-44B9 + Casper, WY 888-235-0515 <br />,. Aaatoral&ca9aweSince 1951 j Gillette, WY 866-686-7175 + Rapid City, SO 888-672-1225 a College Statlon, Tx 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 01/06/11 <br />Project: Schwartzwalder Water Monitoring Program - Ground W Work Order: C10110899 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E903.0 Balch: RA226-5043 <br />Sample ID: C10110899-001EMS Sample Matrix Spike Run: BERTHOLD 770.1_101203A 12/13/10 11:34 <br />Radium 226 15 pCi/L 95 70 130 <br />Sample ID: C10110899-001EMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-1_101203A 12/13/10 11:34 <br />Radium 226 16 pCi/L 102 70 130 6.7 22.9 <br />Sample ID: MB-RA226-5043 3 Method Blank Run: BERTHOLD 770-1101203A 12/13/10 13:07 <br />Radium 226 -0.022 pCi/L U <br />Radium 226 precision (3) 0.073 pCi/L <br />Radium 226 MDC 0.14 pCUL <br />Sample ID: LCS-RA226.5043 Laboratory Control Sample Run: BERTHOLD 770-1_101203A 12/13/10 13:07 <br />Radium 226 -0.086 pCi/L -1 70 130 US <br />- LCS response is outside of the acceptance range for this analysis due to not being spik ed by the analyst. Since the Me, MS, and MSD are acceptable the batch is approve. <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 18 of 23