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www.energytab.com <br />_ "" ? ry Ana0Vc2I ficallanca Slnco 1852 <br />.... _._... ....... ...... .__.. . ......... <br />_..-.__ <br />Helena MT 877-472-0111 . Billings, MT 800-135-4409 a Casper, WY 888-235-0515 <br />Gillette, WY 866-686-7175 ? Rapid City, SD 888-672-1225 o College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 01/05/11 <br />Project: Schwartzwalder Mine Monitoring Program-Surface Wat Work Order: C10110787 <br />Anaiyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E900.0 Batch: GrAB-1009 <br />Sample ID: MB-GrAB-1009 6 Method Blank Run: G542M_101123A I V29110 23:07 <br />Gross Alpha -1 pCi/L U <br />Gross Alpha precision (±) 0.8 pCi/L <br />Gross Alpha MDC 0.9 pCI/L <br />Gross Beta 0.1 pCi/L U <br />Gross Beta precision (±) 1 pCi/L <br />Gross Beta MDG 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 pCi/L 410 243.1 UR <br />Gross Alpha precision (±) 2.33 pCi/L <br />Gross Alpha MDC 4.03 pCi/L <br />Gross Beta 5.28 pCi/L 14 85 <br />Gross Beta precision (±) 2.13 pCi/L <br />Gross Beta MDC 3.41 pCi/L <br />- For Gross Alpha the Sample and the Duplicate are both below the MDC; the RPD is acceptable. <br />Sample ID: C10110695.002AMS 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: G542M_101123A 11/30/10 11:26 <br />Gross Beta 94.7 pCi/L 99 70 130 <br />Sample ID: 010110695-002AMSD 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 />Qualifiers: <br />RL - Analyte 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 detectable concentration <br />Page 22 of 30