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www.ewgoab.com Helena, MT 877- 472 -0711 - Billings, W 800 -735 -4489 - Casper, WY 888- 235 -8515 <br />tEa'bsc"Sines rtst Gillette, WY 866 -606-7175 • 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 Report Date: 07/05/13 <br />Project: Schwartz GW 06/12/13 S27034 Work Order: C13060505 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E200.8 Batch: 37915 <br />Sample ID: C13060538 -001 DMS3 Sample Matrix Spike Run. ICPMS4- C_130624A 06/25/13 02:58 <br />Silver 0.051 mg /L 0.010 101 70 130 <br />Sample ID: C13060538 -001 DMSD3 Sample Matrix Spike Duplicate Run: ICPMS4- C_130624A 06/25/13 03:02 <br />Silver 0.051 mg /L 0.010 103 70 130 1.3 20 <br />Method: <br />E200.8 <br />Analytical Run. ICPMS4- C_130628A <br />Sample ID: <br />ICV <br />Initial Calibration Verification Standard <br />06/28/13 22:39 <br />Silver <br />0.0198 mg /L 0.0010 <br />99 90 110 <br />Method: <br />E200.8 <br />Batch: 37915 <br />Sample ID: <br />MB -37915 <br />Method Blank <br />Run: ICPMS4 -C 130628A <br />06/28/13 23:04 <br />Silver <br />ND mg /L 0.0002 <br />Sample ID: <br />LCS3 -37915 <br />Laboratory Control Sample <br />Run: ICPMS4- C_130628A <br />06/28/13 23:09 <br />Silver <br />0.0479 mg /L 0.0010 <br />96 85 115 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 12 of 21 <br />