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vvw.energylab.CQM 11 Helena MT 877-472-0711 o Billings, MT 800-735-4489 o Casper, WY $88-235-0515 <br />- Ana/ytlea/Ercatlence S/nce 1Y57 Gillette, YN 866-686-7175 - Rapid City, So 888-672-1225 . College Station, TX 088-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 10/04/10 <br />Project: Schwartzwalder Water Monitoring Program-Discharge Work Order: C10090551 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimlt Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_1009151= <br />Sample ID: CCV-3 Continuing Calibration Verificatio n Standard 09115/10 17:51 <br />Chromium, Hexavalent 0.0996 mg/L 0.010 100 60 120 <br />Method: A3500 Cr-B Batch: A2010-09-15_6_CR_02 <br />Sample ID: MBLK-1 Method Blank Run: HACH DR3000 100915E 09/15110 17:51 <br />Chromium, Hexavalenl ND mg/L 0.007 <br />Sample ID: LCS-2 Laboratory Control Sample Run: HACH DR3000_100915E 09115110 17:51 <br />Chromium, Hexavalent 0.0996 mg/L 0.010 100 90 110 <br />Sample ID: C10090551-001BMS Sample Matrix Spike Run: HACH DR3000_100915E 09/15/10 17:51 <br />Chromium, Hexavalent 0.0932 mg/L 0.010 95 80 120 <br />Sample ID: C10090551-001 BMSD Sample Matrix Spike Duplicate Run: HACH DR3000_100915E 09/15/10 17:51 <br />Chromium, Hexavalent 0.0932 mg/L 0.010 95 80 120 0 20 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />........ ............. <br />ND - Not detected at the reporting limit. <br />Page 7 of 22