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----- - ----- ------ <br />- Helena, MT 877-472-0711 R Billings, MIT 800-735-4489 . Casper, WY 888-235-0515 <br />' wvrw.energylab.com <br />Ans"calExna6nnceSim# 1651 Gillette, WY 866-886-7175 • 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: HACH 8000 <br />Sample ID: CCV-3 Continuing Calibration Verificatic <br />Oxygen Demand, Chemical (COD) 1020 mg/L <br />Method: HACH 8000 <br />Sample ID: MBLK-1 Method Blank <br />Oxygen Demand, Chemical (COD) ND mg/L <br />Sample ID: LCS-2 Laboratory Control Sample <br />Oxygen Demand, Chemical (COD) 501 mg/L <br />Sample ID: C10120716-00lDMS Sample Matrix Spike <br />Oxygen Demand, Chemical (COD) 540 mg/L <br />Sample ID: C10120716-001 DMSD Sample Matrix Spike Duplicate <br />Oxygen Demand, Chemical (COD) 544 mg/L <br />Report Date: 01/19/11 <br />Work Order: C10120711 <br />RL %,REC Low Limit High Limit RPD RPDLimit Qual <br />Analytical Run: HACH DR3000_101223A <br />ndard 12/23/10 10:47 <br />5.0 102 90 110 <br />Batch: A2010-12-23_6_COD_01 <br />Run: HACH DR3000_101223A 12/23/10 10:47 <br />3 <br />Run: HACH DR3000_101223A 12/23/10 10:47 <br />5.0 100 90 110 <br />Run: HACH DR3000_101223A 12/23/10 10:48 <br />5.0 107 90 110 <br />Run: HACH DR3000_101223A 12/23/10 10:48 <br />5.0 108 90 110 0.7 10 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 18 of 23