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• www.e mffirlab.mm Helena, MT 8114724711 • Billings, Mt 800-7354489 • Casper, WY 888-2354515 <br />' 'tom J Gillette, WY 866486-7175 • Rapid City, SD 886-672-1225 • 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: 010101008 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A4500-S F Analytical Run: TITRATION-101028A <br />Sample ID: ICV Initial Calibration Verification Standard 10/28/10 15:54 <br />Sulfide 115 mg/L 1.0 100 80 120 <br />Method: A4500-S F Batch: 101028-SULFIDE-TTR-W <br />Sample ID: MBLK7-101028 Method Blank Run: TITRATION_101028A 10/28/10 13:15 <br />Sulfide ND mg/L 5.0 <br />Sample ID: C10101030-002DMS Sample Matrix Spike Run: TITRATION_101028A 10/28/10 13:53 <br />Sulfide 23.5 mg/L 1.0 99 80 120 <br />Sample ID: C10101030-002DMSD Sample Matrix Spike Duplicate Run: TITRATION_101028A 10/28/10 13:55 <br />Sulfide 23.8 mg/L 1.0 100 80 120 1.4 20 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 9 of 23