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wnw.energyiab.com Helena, MT 877-472-0711 Billings, Mr 800-735-4489 o Casper, WY 888-235-0515 <br />_ T_ _ .. / ry Anslytlral&re!lenceSinca 185? Gillette, WY 866-686-7175 # Rapid City, SO 888-672-1225 , College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation <br />Project: Schwartzwalder Mine Monitoring Program-Surface Wat <br />Analyte Count Result Units <br />Method: E200.7 <br />Sample ID: ICB 4 Method Blank <br />Calcium ND mg/L <br />Magnesium 0.0317 mg/L <br />Potassium ND mg/L <br />Sodium ND mg/L <br />Sample 1D: LFB 4 Laboratory Fortified Blank <br />Calcium 10.2 mg/L <br />Magnesium 10.2 mg/L <br />Potassium 10.3 mg/L <br />Sodium 9.74 mg/L <br />Sample ID: C10110741-0016 4 Sample Matrix Spike <br />Calcium 106 mg/L <br />Magnesium 39.2 mg/L <br />Potassium 100 mg/L <br />Sodium 1140 mg/L <br />Sample ID: C10110741-0018 4 Sample Matrix Spike Duplicate <br />Calcium 108 mg/L <br />Magnesium 40.1 mg/L <br />Potassium 104 mg/L <br />Sodium 1140 mg/L <br /> Report Date: 01/05/11 <br /> Work Order: C10110787 <br />RL %REC Low Limit High Limit RPD RPDLimit Clual <br /> Batch: H R67559 <br /> Run: SUB-H67559 12/01/10 10:11 <br />0.50 <br />0.50 <br />0.50 <br />0.50 <br /> Run: SUB-H67559 12/01/10 10:14 <br />1.0 102 85 115 <br />1.0 101 85 115 <br />1.0 103 85 115 <br />1.0 97 85 115 <br /> Run: SUB-H67559 12/01/10 10:21 <br />1.0 70 130 A <br />1.0 97 70 130 <br />1.0 70 130 A <br />1.0 70 130 A <br /> Run: SUB-H67559 12/01/10 10:24 <br />1.0 70 130 1.7 20 A <br />1.0 102 70 130 2.4 20 <br />1.0 70 130 3.1 20 A <br />1.0 70 130 0.4 20 A <br />Qualifiers: <br />RL - Analyte reporting limit. A - The analyte level was greater than four times the spike level. In <br />accordance with the method % recovery is not calculated. <br />ND - Not detected at the reporting limit. MDC - Minimum detectable concentration <br />Page 12 of 30 <br />i -