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".energylab.corn Helena, tdT 877-472-0711 *Billings, MT 800-735-4489 Casper, WY 088-235-0515 <br />,. Arulyrlraf6xce4ance Sfnro 1951 Gillette, WY 866-686-7175 4 Rapid City, SO 886-672.1225 - College Station, TX 808-690-2216 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 01/05111 <br />Project: Schwartzwalder Mine Monitoring Program-Surface Wat Work Order: C10110690 <br />Analyze Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Oual <br />Method: E900.0 Batch: GrAB-1009 <br />Sample ID: MB-GrAB-1009 6 Method Blank Run: G542M_101123A 11/29/10 23:07 <br />Gross Alpha -1 pCi/L U <br />Gross Alpha precision (±) 0.8 pCi/L <br />Gross Alpha MCC 0.9 pCi/L <br />Gross Beta 0.1 pCUL U <br />Gross Beta precision (±) 1 pCi/L <br />Gross Beta MDC 1 pCi/L <br />Sample ID: Th230-GrAB-1009 Laboratory Control Sample Run: G542M_101123A 11/29/10 23:07 <br />Gross Alpha 110 pCi/L 112 70 130 <br />Sample ID: Cs137-GrAB-1009 Laboratory Control Sample Run: G542M_101123A 11/29/10 23:07 <br />Gross Beta 84 pCi/L 94 70 130 <br />Sample ID: C10110386-001CDUP 6 Sample Duplicate Run: G542M_101123A 11/29/10 23:07 <br />Gross Alpha -0.959 pCl/L 410 243.1 UR <br />Gross Alpha precision (±) 2.33 pCi/L <br />Gross Alpha MDC 4.03 pCi/L <br />Gross Bela 5.28 pCi/L 14 85 <br />Gross Bela precision (±) 2.13 pCi/L <br />Gross Beta MDC 3.41 pCi/L <br />• For Gross Alpha the Sample and the Duplicate are bolh below the MDC; the RPD is acceptable. <br />Sample ID: C1D110695.002AMS Sample Matrix Spike Run: G542M_101123A 11/30/10 11:26 <br />Gross Alpha 114 pCi/L 102 70 130 <br />Sample ID: C10110695.002AMSD Sample Matrix Spike Duplicate Run: G542M_101123A 11/30/10 11:26 <br />Gross Alpha 136 pCi/L 124 70 130 17 18.1 <br />Sample ID: C10110695-002AMS Sample Matrix Spike Run: G5421VI_101123A 11/30110 11:26 <br />Gross Bela 94.7 pCi/L 99 70 130 <br />Sample ID: C10110695-002AMSD Sample Matrix Spike Duplicate Run: G542M_101123A 11/30/10 11:26 <br />Gross Beta 99.7 pCi/L 104 70 130 5.2 15.7 <br />Oualifiers: <br />RL - Analyle reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration R - RPD exceeds advisory limit. <br />U - Not detected at minimum delectable concentration <br />Page 26 of 39