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www.enerdab.com J Helena, MT 871472-0711 • Billings, Mi 800-7354468 • Casper, WY 888-235-0515 <br />,I..W.ftuxa sae. rnt Gillette, WY 866-086-1175 • Rapid City, SD 888-672-1225 a College Station, TX 888-680-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 11/05/10 <br />Project: Schwartzwalder Water Monitoring Program Discharge Work Order: C10100100 <br />FAnalyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_101005B <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 10/05/10 14:58 <br />Chromium, Hexavalent 0.0999 mg/L 0.010 100 80 120 <br />Method: A3500 Cr-B Batch: A2010-10-05 6 CR 01 <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_101005B 10/05/10 14:57 <br />Chromium, Hexavalent ND mg/L 0.007 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000_101005B 10/05/10 14:57 <br />Chromium, Hexavalent 0.0989 mg/L 0.010 99 90 110 <br />Sample ID: C10100100-001AMS Sample Matrix Spike Run: HACH DR3000_101005B 10/05/10 15:00 <br />Chromium, Hexavalent 0.102 mg/L 0.010 104 80 120 <br />Sample ID: C10100100-001AMSD Sample Matrix Spike Duplicate Run: HACH DR3000_101005B 10/05/10 15:00 <br />Chromium, Hexavalent 0.0979 mg/L 0.010 100 80 120 4.1 20 <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />Page 7 of 22