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-- --- --- ---- <br />t X715! Rapid Crty, SO 810-672-1225 • College Station, T1188410-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Oenort Date: 12/28/10 <br />Client: Cotter Corporation <br />Project: Schwartzwalder Mine Monitoring Program-Discharge W6rk order: C10110835 <br />Co unt Result Units RL %RE6 Low Limit Hi0h Limit RPD RPDLimit Qual <br />Analyte <br /> Ahalytical Run: TITRATION_101123B <br />Method: A4500-S F 11/23/10 12:45 <br />Sample ID: ICV Initial Calibration Verification Standard 0 »OA <br />Sulfide 104 mg/L 1.0 100 8 <br /> Batch: 101123-SULFIDE-TTR-W <br />Method: A4500-S F 101123B 11/23/10 12:41 <br />Run: TITRATION <br />Sample ID: MBLK7-101123 Method Blank _ <br />Sulfide ND mg/L 0.6 <br />Sample ID: 010110835-001HMS Sample Matrix Spike Run: TITRATION_101123B 11/23/10 13:25 <br />Sulfide 21.6 mg/L 1.0 104 80 120 <br />Sample ID: 010110835-001HMSD Sample Matrix Spike Duplicate Run: TITRATION_101123B 11/23/10 13:28 <br />Sulfide 21.0 mg/L 1.0 101 80 120 2.6 20 <br />Qualifiers: <br />RL - Analyte reporting limit. ND Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />Page 9 of 23