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www.erweab.com � Helena, MT 877- 472 -0711 • Billings, W 800 -735 -4489 • Casper, WY 888 -235 -0515 <br />Aw&tkW .�aj#WwSkw yI52 J Gillette, WY 866 - 886 -7175 * Rapid City, SD 886 -672 -1225 • College Station, TX 888- 690 -2218 <br />QA /QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Project: Schwartz GW 06/07/13 S26942 & S26943 <br />Analyte <br />Count Result Units <br />Method: E903.0 <br />Sample ID: C13060291 -001 EMS <br />Sample Matrix Spike <br />Radium 226 <br />25 pCi /L <br />Sample ID: C13060291- 001EMSD <br />Sample Matrix Spike Duplicate <br />Radium 226 <br />25 pCi /L <br />Sample ID: MB -RA226 -6693 <br />3 Method Blank <br />Radium 226 <br />-0.07 pCi /L <br />Radium 226 precision ( ±) <br />0.10 pCi /L <br />Radium 226 MDC <br />0.2 pCi /L <br />Sample ID: LCS- RA226 -6693 <br />Laboratory Control Sample <br />Radium 226 <br />11 pCi /L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Report Date: 07/05/13 <br />Work Order: C13060291 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: RA226 -6693 <br />Run: BERTHOLD 770- 2_130613C 06/19/13 15:25 <br />107 70 130 <br />Run: BERTHOLD 770-2130613C 06/19/13 15:25 <br />106 70 130 0.9 21.7 <br />Run. BERTHOLD 770-2130613C 06/19/13 17:09 <br />U <br />Run: BERTHOLD 770-2130613C 06/19/13 17:09 <br />102 80 120 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 20 of 24 <br />