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• www.erweab.com Helena, MT 877- 472 -0711 • Billings, W 808- 735 -4489 a Casper, WY 888- 235 -0515 <br />^ Aaal�tat fia dYaar SaQCi flkit 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 <br />3 Laboratory Control Sample <br />Report Date: <br />12/05/13 <br />Schwartz GW 11/15/13 S27276 <br />0.586 mg /L <br />0.0010 <br />117 <br />Work Order: <br />C13110695 <br />rProject: <br />Analyte Count Result <br />Units RL <br />° /6REC <br />Low Limit <br />High Limit RPD <br />RPDLimit Qual <br />Method: E200.8 <br />0.500 mg /L <br />0.00050 <br />100 <br />Analytical Run: <br />ICPMS2- C_131127A <br />Sample ID: ICV 3 Initial Calibration Verification Standard <br />results. <br />Since there were no detectable analyte responses, and the remainder of the <br />run QA is within acceptance range, this batch is approved <br />11/27/13 23:05 <br />Antimony 0.0532 <br />mg /L 0.0010 <br />106 <br />90 <br />110 <br />Arsenic 0.0505 <br />mg /L 0.0010 <br />101 <br />90 <br />110 <br />0.0010 <br />Thallium 0.0507 <br />mg /L 0.0010 <br />101 <br />90 <br />110 <br />0.0010 <br />Method: E200.8 Batch: 39814 <br />Sample ID: MB -39814 3 Method Blank Run: ICPMS2- C_131127A 11/27/13 23:46 <br />Antimony ND mg /L 0.0002 <br />Arsenic 0.0004 mg /L 0.0003 <br />Thallium 0.0002 mg /L 0.0001 <br />Sample ID: LCS3 -39814 <br />3 Laboratory Control Sample <br />Run: ICPMS2- C_131127A <br />11/28/13 00:02 <br />Antimony <br />0.586 mg /L <br />0.0010 <br />117 <br />85 115 <br />S <br />Arsenic <br />0.487 mg /L <br />0.0010 <br />97 <br />85 115 <br />Thallium <br />0.500 mg /L <br />0.00050 <br />100 <br />85 115 <br />- Response is above standard QA limit This could indicate a high bias for the sample <br />results. <br />Since there were no detectable analyte responses, and the remainder of the <br />run QA is within acceptance range, this batch is approved <br />Sample ID: C13110695 -001 DMS3 <br />3 Sample Matrix Spike <br />Run: ICPMS2- C_131127A <br />11/28/13 00:11 <br />Antimony <br />1.19 mg /L <br />0.0010 <br />119 <br />70 130 <br />Arsenic <br />0.967 mg /L <br />0.0010 <br />96 <br />70 130 <br />Thallium <br />1.00 mg /L <br />0.00050 <br />100 <br />70 130 <br />Sample ID: C13110695 -001 DMSD3 <br />3 Sample Matrix Spike Duplicate <br />Run: ICPMS2- C_131127A <br />11/28/13 00:14 <br />Antimony <br />1.19 mg /L <br />0.0010 <br />119 <br />70 130 0.2 <br />20 <br />Arsenic <br />0.981 mg /L <br />0.0010 <br />98 <br />70 130 1.5 <br />20 <br />Thallium <br />1.01 mg /L <br />0.00050 <br />101 <br />70 130 1.3 <br />20 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />S - Spike recovery outside of advisory limits. <br />Page 10 of 21 <br />