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wwwowgvlsb.com ( Helena, W877472-0711 • Billings, W BOO-7354489 a Casper, WY8811-235-0515 <br />a.4?ar;r?srb.?,s sea.Im J Gillette, WY 866-686-7175 a 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 /17/10 <br />Project: Schwartzwalder Water Monitoring Program (S25247) Work Order: C10101008 <br />EA alyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Quai <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_101027C <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 10/27/10 15:31 <br />Chromium, Hexavalent 0.0991 mg/L 0.010 99 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: C10101008-001AMS <br />Chromium, Hexavalent <br />Sample ID: C10101008-001AMSD <br />Chromium, Hexavalent <br />Method Blank <br />ND mg/L <br />Laboratory Control Sample <br />0.0981 mg/L <br />Sample Matrix Spike <br />0.0981 mg/L <br />Sample Matrix Spike Duplicate <br />0.0991 mg/L <br />0.010 <br />Run: HACH DR3000_101027C 10/27/10 15:31 <br />0.010 98 90 110 <br />Run: HACH DR3000_101027C 10/27/10 15:32 <br />0.010 100 80 120 <br />Run: HACH DR3000_101027C 10/27/10 15:32 <br />0.010 101 80 120 1.0 20 <br />Batch: A2010-10-27 6 CR 01 <br />Run: HACH DR3000_101027C 10/27/10 15:31 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 7 of 23