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' ,Aww.energylab.com Helena, MT 877-472-0711 • Billings, MT 800-735.4489 « Casper, WY 8BS-235-0515 <br />Analytical ExceAence Slace 1052 <br />Gillette, WY 866-686-7175 s Rapid City, SD 868.672-1225 • Collegestation, TX 8BS-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Project: Schwartzwalder Mine Monitoring Program-Surface Wat <br />Analyte Count Result Units <br />Method: E903.0 <br />Sample ID: 010110690-007EDUP 3 Sample Duplicate <br />Radium 226 0.86 pCi/L <br />Radium 226 precision (±) 0.20 pCi/L <br />Radium 226 MDC 0.14 pCi/L <br />Sample ID: C1 01 10690-007FMS Sample Matrix Spike <br />Radium 226 20 pCi/L <br />Sample ID: C10110690.007FDUP 3 Sample Duplicate <br />Radium 226 0.79 pCi/L <br />Radium 226 precision (±} 0.20 pCi/L <br />Radium 226 MDC 0.15 pCi/L <br />Sample ID: MB-RA226-5055 3 Method Blank <br />Radium 226 0.09 pCi/L <br />Radium 226 precision (±) 0.09 pCi/L <br />Radium 226 MDC 0.1 pCi/L <br />Sample ID: LCS-RA226-5055 Laboratory Con trol Sample <br />Radium 226 7.4 pCi/L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Report Date: 01/05/11 <br />Work Order: C10110690 <br />RL %REC Low Limit High Limit RPD RPDLimlt Qual <br />Balch: RA226-5055 <br />Run: TENNELEC-3_101209C 12116110 15:34 <br />29 59.7 <br />Run: TENNELEC-3_101209C 12/16110 15:34 <br />107 70 130 <br />Run: TENNELEC-3_-101209C 12%16110 15:34 <br />9.9 59 <br />Run: TENNELEC-3. 101209C 12116/10 15:34 <br />U <br />Run: TENNELEC-3 101209C <br />92 70 130 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />12/16/10 15:34 <br />Page 27 of 39 <br />