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www.energylab.com <br />Aaa"Cal £xce9exa $IWO 1932 <br />Helena, MT 877-472-0711 • Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />Gillette, WY 866-686-7175 • Rapid City, SD 888-672-1125 * College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br /> Report Date: 01/24/11 <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water S ampling Program Discharge Work Order: C10120395 <br />Analyte Count Result Units RL % REC Low Limit High Limit RPD RPDLimit Qual <br /> Analytical Run: HACH DR3000_101210D <br />Method: A3500 Cr-B <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 12/10/10 14:45 <br />Chromium, Hexavalent 0.0992 mg/L 0.010 99 90 110 <br /> CR_01 <br />6 <br />Batch: A2010-12-10 <br />Method: A3500 Cr-B _ <br />_ <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_101210D 12/10/10 14:44 <br />Chromium, Hexavalent ND mg/L 0.007 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000_101210D 12/10/10 14:45 <br />Chromium, Hexavalent 0.101 mg/L 0.010 101 90 110 <br />Sample ID: C10120395-001AMS Sample Matrix Spike Run: HACH DR3000_101210D 12/10/10 14:45 <br />Chromium, Hexavalent 0.103 mg/L 0.010 105 80 120 <br />Sample ID: C10120395-001AMSD Sample Matrix Spike Duplicate Run: HACH DR3000_101210D 12/10/10 14:45 <br />Chromium, Hexavalent 0.0992 mg/L 0.010 101 80 120 3.8 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 22