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www.cncr&lab.com Helena, MT 877-472-0711 Billings, tAT 688-735-4489 + Casper, WY 886-235-0515 <br />?- AnatytlcelLwellewesince 79l8 Gillette, WY 886-686-7175 Rapid City, SD 888-672-1225 - College Station, T% 888-BBD-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 09/27/10 <br />Project: Schwartzwalder Water Monitoring Program-Discharge Work Order: C10090073 <br /> <br /> <br />. <br />..... ...... . ......... <br />Analyte Count Result Units <br /> <br /> <br />...... <br />.. ........ .. . ... <br />RL %REC Low Limit High Limit RPD <br /> <br /> <br /> <br />PDLimit Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_1009028 <br />Sample ID: CCV-3 Continuing Calibration Verification Standard 09/02/1013:34 <br />Chromium, Hexavalent 0.102 mg/L 0.010 102 80 120 <br />Method: A3500 Cr-B Batch: A2010.09.02_.6_CR__..01 <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000_100902B 09/02/1013:34 <br />Chromium, Hexavalenl ND mg/L 0.007 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000100902B 09/02/10 13:34 <br />Chromium, Hexavalent 0.104 mg/L 0.010 104 90 110 <br />Sample ID: 010090073-001AMS Sample Matrix Spike Run: HACH DR3000_100902B 09/02/10 13:34 <br />Chromium, Hexavalent 0.0943 mg/L 0.010 96 80 120 <br />Sample ID: C10090073-001AMSD Sample Matrix Spike Duplicate Run: HACH DR3000_100902B 09/02/10 13:34 <br />Chromium, Hexavalent 0.0952 mglL 0.010 97 80 120 0.9 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