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www.energylab.com Helena, MT 877-472-0711 « Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />Au"calfxce9emeSmee 1932 Gillette, WY 866-686-7175 • Rapid City, SO 688-672-1225 • 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 />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: RA-05 Batch: RA228-3324 <br />Sample ID: LCS-228-RA226-4726 Laboratory Control Sample Run: TENNELEC-3_100812C 08/24/10 13:31 <br />Radium 228 7.71 pCi/L 111 70 130 <br />Sample ID: MB-RA226-4726 3 Method Blank Run: TENNELEC-3_100812C 08/24/10 13:31 <br />Radium 228 -0.6 pCi/L U <br />Radium 228 precision (±) 0.7 pCi/L <br />Radium 228 MDC 1 pCi/L <br />Sample ID: C10080438-001GMS Sample Matrix Spike Run: TENNELEC-3_100812C 08/24/10 13:31 <br />Radium 228 12.8 pCi/L 76 70 130 <br />Sample ID: C10080438-001GMSD Sample Matrix Spike Duplicate Run: TENNELEC-3_100812C 08/24/10 13:31 <br />Radium 228 14.6 pCi/L 87 70 130 13 35.9 <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 5 of 8