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¦ www.e malob.com J Helena, AQ 877472-0711 • Billings, W 800-7354489 • Casper, WY 888-235-1515 <br />¦ 'a tit Gillette, WY 866-686-7175 • Rapid City, SD 888-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 11 /17/10 <br />Project: Schwartzwalder Water Monitoring Program (S25247) Work Order: C10101008 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: RA-05 Batch: RA228-3472 <br />Sample ID: LCS-228-RA226-4970 Laboratory Con trol Sample Run: TENNELEC-3_101108D 11/11/10 13:19 <br />Radium 228 6.9 pCi/L 91 70 130 <br />Sample ID: MB-RA226-4970 3 Method Blank Run: TENNELEC-3_101108D 11/11/10 13:19 <br />Radium 228 0.16 pCi/L U <br />Radium 228 precision (±) 0.69 pCi/L <br />Radium 228 MDC 1.2 pCi/L <br />Sample ID: C10100697-008DMS <br />Radium 228 <br />Sample ID: C10100697-008DMSD <br />Radium 228 <br />Sample Matrix Spike <br />19 pCi/L <br />Sample Matrix Spike Duplicate <br />18 pCi/L <br />Run: TENNELEC-3_101108D <br />103 70 130 <br />Run: TENNELEC-3_101108D <br />92 70 130 8.4 <br />11/11/10 13:19 <br />11/11/10 13:19 <br />30.5 <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 18 of 23