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www.energylab.com Helena, MT 677-472-0711 ° Billings, MT 800-735-4489 « Casper, WY 888-235-0515 <br />t09'rE1C8a°"Q°8 tatsz Gillette, WY 866-686-7175 • Rapid City, SD 888-672-1225 • 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 />Analyle Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_100818C <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 08/18/10 13:27 <br />Chromium, Hexavalent 0.0994 mg/L 0.010 99 80 120 <br />Method: A3500 Cr-B Batch: A2010-08-18 6 CR 01 <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_100818C 08/18/10 13:27 <br />Chromium, Hexavalent ND mg/L 0.007 <br />Sample ID: LCS-2 <br />Chromium, Hexavalent <br />Sample ID: C10080639-001BMS <br />Chromium, Hexavalent <br />Sample ID: 010080639-001BMSD <br />Chromium, Hexavalent <br />Laboratory Control Sample <br />0.103 mg/L <br />Sample Matrix Spike <br />0.0966 mg/L <br />Sample Matrix Spike Duplicate <br />0.0984 mg/L <br />Run: HACH DR3000_100818C <br />0.010 103 90 110 <br />Run: HACH DR3000_100818C <br />0.010 99 80 120 <br />Run: HACH DR3000_100818C <br />0.010 100 80 120 1.8 <br />08/18/10 13:27 <br />08/18/10 13:28 <br />08/18/10 13:28 <br />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 21