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wvrw.energylab.com Helena, MT B77-472-0711 • Billings, MT 600-735-4489 • Casper, WY 888-235-0515 <br />,l,&Ucl/Exca9anceSince 1952 l Gillette, ANY 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 <br />Analyte Count Result Units <br />Method: E300.0 <br />Sample ID: LCS 2 Laboratory Control Sample <br />Chloride 10.0 mg/L <br />Sulfate 40.1 mg/L <br />Sample ID: MBLK 2 Method Blank <br />Chloride ND mg/L <br />Sulfate 0.2 mg/L <br />Sample ID: C10120455-001BMS 2 Sample Matrix Spike <br />Chloride 26.9 mg/L <br />Sulfate 79.7 mg/L <br />Sample ID: C1 0120455-001 BMSD 2 Sample Matrix Spike Duplicate <br />Chloride 27.2 mg/L <br />Sulfate 81.1 mg/L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Report Date: 01 /19/11 <br />Work order: C10120711 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: R141329 <br />Run: IC2-C_101228A 12/28/10 13:37 <br />1.0 100 90 110 <br />1.0 100 90 110 <br />Run: IC2-C_101228A 12/28/10 13:53 <br />0.06 <br />0.2 <br />Run: IC2-C_101228A 12/28/10 15:41 <br />1.0 105 80 120 <br />1.6 101 80 120 <br />Run: IC2-C_101228A 12/28/10 15:56 <br />1.0 107 80 120 1.2 10 <br />1.6 103 80 120 1.7 10 <br />ND - Not detected at the reporting limit. <br />Page 16 of 23