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C www.energylab.com <br />Aw0icol EXCa110c8 Slneo 1952 <br />Helena, MT B77-472-0711 • Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />Gillette, WY 866-686-7175 v- Rapid City, SO 888-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br /> Report Date: 01 /19/11 <br />Client: Cotter Corporation Work order: C10120711 <br />Project: Schwartzwalder Mine <br />Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Analyte Analytical Run: TITRATION_101223A <br />Method: A4500-S F 12123!10 09:34 <br />Sample ID: ICV Initial Calibration Verification Standard <br />120 <br /> 86.4 mg/L 1.0 98 80 <br />Sulfide <br />Batch: 101223-SULFIDE-TTR-W <br />Method: A4500-S F 1 01 223A 12/23/10 09:31 <br />Run: TITRATION <br />Sample ID: MBLK7-101223 Method Blank - <br />Sulfide <br />ND mg/L 0.6 <br /> 101223A 12/23/10 09:39 <br />Run: TITRATION <br />Sample ID: 01 01 2 071 1-OO11MS Sample Matrix Spike - <br />80 120 <br />Sulfide 1 0 <br />17.8 mg/L 101 <br /> <br />le ID: 010120711-0011MSD <br />Sam <br />Sample Matrix Spike Duplicate Run: TITRATION_101223A 12/23/10 09:42 <br />1 8 20 <br />p 17.4 mg/L 1.0 120 <br />99 80 <br />Sulfide <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 9 of 23