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" www.erodab.com Helena, mT 877-472=0711 + Billings, W800-735-4489 • Casper, WY 888-235-0515 <br />Aury"Ewdw= SO t8f1 i Gillette; rn 866-696-7175 • Rapid City, SO 88B-672-1225 * College Station, TX 888-688-2216 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Project: Schwartz-GW 03/30/11 S25671 & S25672 <br />Analyte Count Result Units <br />Method: E200.8 <br />Sample ID: MB-29448 8 Method Blank <br />Aluminum ND mg/L <br />Antimony ND mg/L <br />Arsenic ND mg/L <br />Copper ND mg/L <br />Iron ND mg/L <br />Lead ND mg/L <br />Manganese ND mg/L <br />Thallium ND mg/L <br />Sample ID: LCS3-29448 8 Laboratory Control Sample <br />Aluminum 2.47 mg/L <br />Antimony 0.567 mg/L <br />Arsenic 0.502 mg/L <br />Copper 0.505 mg/L <br />Iron 2.37 mg/L <br />Lead 0.523 mg/L <br />Manganese 2.49 mg/L <br />Thallium 0.488 mg/L <br />Sample ID: 011030944-001CMS3 8 Sample Matrix Spike <br />Aluminum 2.89 mg/L <br />Antimony 0.588 mg/L <br />Arsenic 0.528 mg/L <br />Copper 0.528 mg/L <br />Iron 2.67 mg/L <br />Lead 0.545 mg/L <br />Manganese 2.56 mg/L <br />Thallium 0.522 mg/L <br />Sample ID: C1 1030944-001 CMSD 8 Sample Matrix Spike Duplicate <br />Aluminum 2.83 mg/L <br />Antimony 0.565 mg/L <br />Arsenic 0.495 mg/L <br />Copper 0.493 mg/L <br />Iron 2.54 mg/L <br />Lead 0.529 mg/L <br />Manganese 2.47 mg/L <br />Thallium 0.510 mg/L <br />Report Date: 04/25/11 <br />Work order: C11030940 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: 29448 <br />Run: ICPMS4-C 110404A 04/05/11 20:24 <br />0.20 <br />0.0010 <br />0.0010 <br />0.0010 <br />0.030 <br />0.0050 <br />0.0050 <br />0.00020 <br /> Run: ICPMS4-C 110404A 04/05/11 20:31 <br />0.10 98 85 115 <br />0.050 113 85 115 <br />0.0010 100 85 115 <br />0.010 101 85 115 <br />0.030 94 85 115 <br />0.050 105 85 115 <br />0.010 99 85 115 <br />0.10 98 85 115 <br /> Run: ICPMS4-C_110404A 04/05/1123:30 <br />0.10 107 70 130 <br />0.050 118 70 130 <br />0.0010 105 70 130 <br />0.010 105 70 130 <br />0.030 98 70 130 <br />0.050 109 70 130 <br />0.010 102 70 130 <br />0.10 104 70 130 <br /> Run: ICPMS4-C_110404A 04/05/1123:37 <br />0.10 105 70 130 2.2 20 <br />0.050 113 70 130 4.1 20 <br />0.0010 99 70 130 6.3 20 <br />0.010 98 70 130 6.9 20 <br />0.030 93 70 130 4.9 20 <br />0.050 106 70 130 3.1 20 <br />0.010 98 70 130 3.5 20 <br />0.10 102 70 130 2.4 20 <br />Method: E200.8 ttatcn: hi4441dA <br />Sample ID: C11030851-001CMS4 12 Sample Matrix Spike Run: ICPMS4-C_110404A 04/04/11 23:12 <br />Aluminum 0.0500 mg/L 0.0010 100 70 130 <br />Antimony 0.0571 mg/L 0.050 114 70 130 <br />Arsenic 0.0537 mg/L 0.0010 107 70 130 <br />Copper 0.0500 mg/L 0.010 100 70 130 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 11 of 24