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www.energylab.com Helena, MT 877.472-0711 * Billings, MT 800-735-4469 * Casper, wy 888-235-0515 <br />Ans"CalErce9eeceSMee 1952 Gillette, WY 866-666.7175 * Rapid City, SD 886-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program <br />Report Date: 09/09/10 <br />Work Order: C10080639 <br />Ana?lyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: HACH 8000 Batch: A2010-08-20_6_COD_01 <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_100820B 08/20/10 11:00 <br />Oxygen Demand, Chemical (COD) ND mg/L 3 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000_100820B 08/20/10 11:00 <br />Oxygen Demand, Chemical (COD) 514 mg/L 5.0 103 90 110 <br />Sample ID: 010080736-002DMS Sample Matrix Spike Run: HACH DR3000_100820B 08/20/10 11:03 <br />Oxygen Demand, Chemical (COD) 549 mg/L 5.0 105 90 110 <br />Sample ID: C10080736-002DMSD Sample Matrix Spike Duplicate Run: HACH DR3000_100820B 08/20/10 11:03 <br />Oxygen Demand, Chemical (COD) 557 mg/L 5.0 106 90 110 1.4 10 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 16 of 21