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www.energylab.com Helena, W 877.472-0711 Y Billings MT 800-735-4469 • Casper, WY 888-235-0515 <br />El' AU"Calf..eafewaftee 119 Gillette, WY 866486-1175 ® Rapid City, SD 888-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program <br />Report Date: 09/02/10 <br />Work Order: C10080763 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A4500-S F Analytical Run: TITRATION-1008206 <br />Sample ID: ICV Initial Calibration Verification Standard 08/20/10 10:11 <br />Sulfide 115 mg/L 1.0 100 80 120 <br />Method: A4500-S F <br />Sample ID: MBLK7-100820 <br />Sulfide <br />Sample ID: 010080733-004EMS <br />Sulfide <br />Sample ID: C10080733-004EMSD <br />Sulfide <br />Method Blank <br />ND mg/L <br />Sample Matrix Spike <br />35.4 mg/L <br />Sample Matrix Spike Duplicate <br />35.5 mg/L <br />0.6 <br />Run: TITRATION-100820B 08/20/10 10:40 <br />1.0 102 80 120 <br />Run: TITRATION_100820B 08/20/10 10:44 <br />1.0 103 80 120 0.5 20 <br />Batch: 100820-SULFIDE-TTR-W <br />Run: TITRATION-100820B 08/20/10 10:07 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />ND - Not detected at the reporting limit. <br />Page 3 of 6