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M], www.energylab.com I/ Helena, MT 877-472-0711 + Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />Anal0catEaca9aaca5lace 1952 ) I Gillette, WY 866-686-7175 • Rapid City, SO 888-672-1225 * College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 01/24/11 <br />Project: Schwartzwalder Water S ampling Program Discharge Work Order: C10120395 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDL[mit Qua[ <br /> Analytical Run: TITRATION-101210A <br />Method: A4500-S F <br />Sample ID: ICV Initial Calibration Verification Standard 12/10/10 09:28 <br />Sulfide 101 mg/L 1.0 97 80 120 <br /> Batch: 101210-SULFIDE-TTR-W <br />Method: A4500-S F <br />Sample ID: MBLK7-101210 Method Blank Run: TITRATION-101210A 12/10/10 09:20 <br />Sulfide ND mg/L 0.6 <br />Sample [D: 010120257-002DMS Sample Matrix Spike Run: TITRATION_101210A 12/10/10 09:56 <br />Sulfide 20.8 mg/L 1.0 100 80 120 <br />Sample ID: C10120257-002DMSD Sample Matrix Spike Duplicate Run: TITRATION_101210A 12/10/10 09:58 <br />Sulfide 20.5 mg/L 1.0 98 80 120 1.6 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 22