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www"ergyleb-mm ( Helena, W 677472-0711 • Billings, Wr 800-7354488 • Casper, WY 888-235-0515 <br />AadjalnlE?aa'A.Im ) Gillette, WY 886-888-7175 0 Rapid City, SD 888-672-1225 • College Station, TX 888-880-2218 <br />QA/QC Summary Report <br />Revised Date: 11/23/10 <br />Client: Cotter Corporation Report Date: 11/12/10 <br />Project: Schwartzwalder Water Monitoring Program Discharge Work Order: C10100590 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_101015F <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 10/15/10 14:10 <br />Chromium, Hexavalent 0.101 mg/L 0.010 101 90 110 <br />Method: A3500 Cr-B <br />Sample ID: MBLK-1 <br />Chromium, Hexavalent <br />Sample ID: LCS-2 <br />Chromium, Hexavalent <br />Sample ID: C10100590-001AMS <br />Chromium, Hexavalent <br />Sample ID: C10100590-001AMSD <br />Chromium, Hexavalent <br />Method Blank <br />ND mg/L <br />Laboratory Control Sample <br />0.101 mg/L <br />Sample Matrix Spike <br />0.101 mg/L <br />Sample Matrix Spike Duplicate <br />0.0988 mg/L <br />0.007 <br />Run: HACH DR3000_101015F 10/15/10 14:10 <br />0.010 101 90 110 <br />Run: HACH DR3000_101015F 10/15/10 14:11 <br />0.010 103 80 120 <br />Run: HACH DR3000_101015F 10/15/10 14:11 <br />0.010 101 80 120 2.2 20 <br />Batch: A2010-10-15 6 CR 01 <br />Run: HACH DR3000_101015F 10/15/10 14:10 <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