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www.eneigylab.com <br />..??/ A4al I"l Ercelle4ce Since 1931 <br />Helena, MT 877-472-0711 - Billings, IAT 800-735-4489 - Casper, WY 888-235-0515 <br />Gillette, WY 866.686-7175 V Rapid City, SD 888-672-1225 • College Station, T)(888-690-221 8 <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: A2540 C <br />Sample ID: MBLK1_101122 Method Blank <br />Solids, Total Dissolved TDS @ 180 C 10 mg/L <br />Sample ID: LCS1_101122 Laboratory Control Sample <br />Solids, Total Dissolved TDS @ 180 C 1000 mg/L <br />Sample ID: C10110756-010AMS Sample Matrix Spike <br />Solids, Total Dissolved TDS @ 180 C 6390 mg/L <br />Sample ID: C10110756-010AMSD Sample Matrix Spike Duplicate <br />Solids, Total Dissolved TDS @ 180 C 6350 mg/L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br /> Report Date: 01/05/11 <br /> Work Order: C10110787 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br /> Batch: 101122 1 SLDS-TDS-W <br /> Run: BAL-1 _101122B 11/22/10 14:45 <br />10 <br /> Run: SAL-1- 101 122B 11/22/10 14:45 <br />10 99 90 110 <br /> Run: BAL-1_ 101122B 11/22/10 14:52 <br />12 103 90 110 <br /> Run: BAL-1_ 1011228 11/22/10 14:52 <br />12 104 90 110 0.7 10 <br />ND - Not detected at the reporting limit. <br />Page 8 of 30