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wwwAmgosb.com J Helena, W 877-4724711 • Billings, W 800-735-4489 • Casper, WY NO-235-8515 <br />?Im AM"WEipNara3lf = IJlV Gillette, wY 866486-7175 • Rapid City, SO 888-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 11/05/10 <br />Project: Schwartzwalder Water Monitoring Program Discharge Work Order: C10100100 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimlt Qual <br />Method: E200.8 Batch: 27779 <br />Sample ID: MB-27779 4 Method Blank Run: ICPMS2-C_101018A 10/19/10 01:00 <br />Antimony 0.0002 mg/L 0.0002 <br />Arsenic 0.001 mg/L 0.0003 <br />Thallium ND mg/L 5E-05 <br />Uranium ND mg/L 4E-05 <br />Sample ID: LCS3-27779 4 Laboratory Control Sample Run: ICPMS2-C_101018A 10/19/10 01:07 <br />Antimony 0.601 mg/L 0.050 120 85 115 S <br />Arsenic 0.519 mg/L 0.0010 103 85 115 <br />Thallium 0.534 mg/L 0.10 107 85 115 <br />Uranium 0.574 mg/L 0.00030 115 85 115 <br />- Response is above standard CIA limit. This could indicate a high bias for the sample results. Since there were no detectable analyte responses, and the remainder of the <br />run OA is within acceptance range, this batch is approved. <br />Sample ID: C10100037-002DMS3 4 Sample Matrix Spike Run: ICPMS2-C_101018A 10/19/10 02:28 <br />Antimony 0.599 mg/L 0.050 120 70 130 <br />Arsenic 0.525 mg/L 0.0010 105 70 130 <br />Thallium 0.532 mg/L 0.10 106 70 130 <br />Uranium 0.605 mg/L 0.00030 119 70 130 <br />Sample ID: C10100037-002DMSD 4 Sample Matrix Spike Duplicate Run: ICPMS2-C_101018A 10/19/10 02:35 <br />Antimony 0.608 mg/l- 0.050 122 70 130 1.5 20 <br />Arsenic 0.529 mg/L 0.0010 105 70 130 0.8 20 <br />Thallium 0.539 mg/L 0.10 108 70 130 1.3 20 <br />Uranium 0.606 mg/L 0.00030 119 70 130 0.1 20 <br />Method: E200.8 Batch: R138669 <br />Sample ID: LRB 8 Method Blank Run: ICPMS2-C_101018A 10/18/10 15:35 <br />Arsenic ND mg/L 6E-05 <br />Cadmium ND mg/L 1E-05 <br />Copper ND mg/L 7E-05 <br />Nickel ND mg/L 0.0007 <br />Selenium ND mg/L 0.0002 <br />Silver ND mg/L 3E-05 <br />Uranium ND mg/L 1 E-05 <br />Zinc ND mg/L 0.0003 <br />Sample ID: LFB 8 Laboratory Fort ified Blank Run: ICPMS2-C_101018A 10/18/10 15:42 <br />Arsenic 0.0534 mg/L 0.0010 107 85 115 <br />Cadmium 0.0520 mg/L 0.0010 104 85 115 <br />Copper 0.0513 mg/L 0.0010 103 85 115 <br />Nickel 0.0518 mg/L 0.0010 104 85 115 <br />Selenium 0.0536 mg/L 0.0010 107 85 115 <br />Silver 0.0197 mg/L 0.0010 98 85 115 <br />Uranium 0.0543 mg/L 0.00030 109 85 115 <br />Zinc 0.0528 mg/L 0.0010 106 85 115 <br /> <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration S - Spi ke recovery outside of advisory limits. <br /> Page 12 of 22