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z. <br />' www.enefeab.com Helena, MT B77-472-0711 • Billings, MT 800-735-4489 -Casper, WY 898-235-0515 <br />t Anaoril&reuenceSince 1952 Gillette, WY 866-686-7175 b Rapid City, SD 888-672-1225 + College Station TX 888-69D-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 12/22/10 <br />Project: Schwartzwaider Water Monitoring Program - Groundwa work order: C10110786 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E900.0 Balch: GrAB-1009 <br />Sample ID: MB-GrAB-1009 6 Method Blank Run: G542M_101123A 11/29/10 23:07 <br />U <br />Gross Alpha -1 pCi/L <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 MDC 1 pCUL <br />Sample ID: Th230-GrAB-1009 Laboratory Control Sample Run: G542M_1 01 123A 11/29110 23:07 <br />Gross Alpha 110 pCi/L 112 70 130 <br />Sample ID: Cs137-GrAB-1009 Laboratory Control Sample Run: G542M_l01123A 11129/10 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 pCiiL 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 Bela precision (±1 2.13 pCi/L <br />Gross Beta MDC 3.41 pCi/L <br />- For Gross Alpha the Sample and the D uplicate are both below the MDC: the RPD is acceptable. <br />Sample ID: C1 01 10695-002AMS Sample Matrix Spike Run: G5421V_101123A 11/30/10 11:26 <br />Gross Alpha 114 pCi/L 102 70 130 <br />Sample ID: C1 0111 0695-002AMSD Sample Matrix Spike Duplicate Run: G542M_101123A 11130110 11 *26 <br />Gross Alpha 136 pGUL 124 70 130 17 18.1 <br />Sample ID: C10110695-002AMS Sample Matrix Spike Run: G542M_101123A 11130!10 11:26 <br />Gross Beta 94.7 pCi/L 99 70 130 <br />Sample ID: C10110695-D02AMSD 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. <br />MDC - Minimum detectable concentration <br />U - Not detected at minimum delectable concentration <br />ND - Not detected at the reporting limit. <br />R - RPD exceeds advisory limit. <br />Page 17 of 22