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watr netgylaba0m YA 877 472-0711 • Billings, MrB00-735-4489 • casper,WY888-235-1515 <br />Auti"Fa=&MSAW@ IM 7 fi75 • sapid C ty, so BIB 612-1225 • college Station, TX 886-61B-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 12/28/10 <br />Project: Schwartzwalder Mine Monitoring Program-Discharge Work Order: C10110835 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_101123A <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 11/23/10 14:28 <br />Chromium, Hexavalent 0.101 mg/L 0.010 101 90 110 <br /> 6_CR_01 <br />Batch: A2010-11-23 <br />Method: A3500 Cr-B _ <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_101123A 11/23/10 14:27 <br />Chromium, Hexavalent ND mg/L 0.007 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000_101123A 11/23/10 14:28 <br />Chromium, Hexavalent 0.0995 mg/L 0.010 100 90 110 <br />Sample ID: 010110835-001AMS Sample Matrix Spike Run: HACH DR3000_101123A 11/23/10 14:29 <br />Chromium, Hexavalent 0.105 mg/L 0.010 107 80 120 <br />Sample ID: C10110835-001AMSD Sample Matrix Spike Duplicate Run: HACH DR3000_101123A 11/23/10 14:29 <br />Chromium, Hexavalent 0.105 mg/L 0.010 107 80 120 0.0 20 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 7 of 23