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www.energylab.com Helena, MT 877-472-0711 * Billings, MT 800-735-4489 * Casper, WY 888-235-0515 <br />Ans"W e Sb0B rite Gillette, WY 866-686-7175 • Rapid City, SD 888-672-1225 • College Station, TX 888-690-2216 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program <br />Report Date: 09/10/10 <br />Work Order: C10080420 <br />Analytl a Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Oual <br />1 <br />Method: E903.0 Batch: RA226-4726 <br />Sample ID: C10080308-004CMS Sample Matrix Spike Run: BERTHOLD 770-1_ 100812A 08/29/10 11:18 <br />Radium 226 15.1 pCi/L 95 70 130 <br />Sample ID: C10080308-004CMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-1_ 100812A 08/29/10 12:51 <br />Radium 226 15.6 pCi/L 98 70 130 3 24.6 <br />Sample ID: MB-RA226-4726 3 Method Blank Run: BERTHOLD 770-1_ 100812A 08/29/10 12:51 <br />Radium 226 -0.02 pCi/L U <br />Radium 226 precision (±) 0.09 pCi/L <br />Radium 226 MDC 0.2 pCi/L <br />Sample ID: LCS-RA226-4726 Laboratory Control Sample Run: BERTHOLD 770-1_ 100812A 08/29/10 12:51 <br />Radium 226 7.3 pCi/L 93 70 130 <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 4 of 8