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- MT 877-472-0711 • Billings, MT 800-735-4489 - Casper, WY 888-235-0515 <br />Helena <br />vrvaw.energylab.com <br />A061k9/frce9eaceSlnco 1952 , <br />Gillette, WY 866-6B6-7175 a Rapid City, SD 88B-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: 010120711 <br />Project: Schwartzwalder Mine _ <br />te Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Anal <br />y Analytical Run: HACH DR3000_101221 E <br />Method: A3500 Cr-B 12/21/10 15:31 <br />Sample ID: CCV-3 Continuing Calibration Verification Standard <br />110 <br />Chromium, Hexavalent 0.101 mg/L 0.010 101 90 <br /> Batch: A2010-12-21_6_CR_01 <br />Method: A3500 Cr-B <br />101221E 12/21/1015:30 <br />Run: HACH DR3000 <br />Sample ID: MBLK-1 <br />_ <br />Method Blank <br />Chromium, Hexavalent ND mg/L 0.007 <br /> Laboratory Control Sample Run: HACH DR3000_101221E 12/21/10 15:31 <br />Sample ID: LCS-2 0994 mg/L 0.010 99 90 110 <br />0 <br />Chromium, Hexavalent <br />. <br /> 101221E 12/21/10 15:32 <br />Run: HACH DR3000 <br />Sample ID: 01 01 2071 1-001 6MS _ <br />Sample Matrix Spike <br />80 120 <br />Chromium, Hexavalent 0.010 101 <br />0.0994 mg/L <br /> <br />le ID: 010120711-001BMSD <br />Sam Run: HACH DR3000_101221E 12/21/1015:32 <br />Sample Matrix Spike Duplicate <br />0 20 <br />0 <br />p <br />Chromium, Hexavalent . <br />120 <br />0.0994 mg/L 0.010 101 80 <br />Qualifiers: <br />ND Not detected at the reporting limit. <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Page 7 of 23