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www.energylab.com t Helena, MT 877-472-0711 , Billings, MT 800-735-4489 . Casper, WY 888-235-0515 <br />AnaryGca/Ecca!lance Slaca 1952 1 Gillette, WY 866-686-7175. Rapid City, so 888-672-1225 * College Station, T% 888-690-2218 <br />........... .._ <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program <br />Report Date: 09/14/10 <br />Work Order: C10080305 <br /> <br />Analyte Co unt Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: HACH 8000 Batch: A2010-08-16 6 COD 01 <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_100816A 08/16/10 12:16 <br />Oxygen Demand, Chemical (COD) ND mg/L 3 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000_100816A 08/16/10 12:17 <br />Oxygen Demand, Chemical (COD) 511 mg/L 5.0 102 85 115 <br />Sample ID: C10080440-005DMS Sample Matrix Spike Run: HACH DR3000_100816A 08/16/10 12:18 <br />Oxygen Demand, Chemical (COD) 555 mg/L 5.0 106 85 115 <br />Sample ID: C10080440-005DMSD Sample Matrix Spike Duplicate Run: HACH DR3000_100816A 08/16/10 12:18 <br />Oxygen Demand, Chemical (COD) 551 mg/L 5.0 105 85 115 0.7 15 <br /> <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />Page 16 of 21