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www.en a4eb.com Helena, MT 877472-0711 • Billings, MT 800-7354489 • Casper, WY 888-235-0515 <br />AarlymtW iuuiit w Braes 1138 J Gillette, WY 866-686-7175 • Rapid City, SD 886-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 08/15/10 <br />Project: Schwartzwalder Water Monitoring Program Work Order: C10070865 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E300.0 Batch: R135566 <br />Sample ID: LCS 2 Laboratory Control Sample Run: IC2-C_100728A 07/28/10 13:06 <br />Chloride 9.46 mg/L 1.0 95 90 110 <br />Sulfate 38.1 mg/L 1.0 95 90 110 <br />Sample ID: MBLK 2 Method Blank Run: IC2-C_100728A 07/28/10 13:22 <br />Chloride ND mg/L 0.2 <br />Sulfate ND mg/L 0.04 <br />Sample ID: C10070848-001AMS 2 Sample Matrix Spike Run: IC2-C_100728A 07/28/10 23:13 <br />Chloride 22.7 mg/L 1.0 98 80 120 <br />Sulfate 315 mg/L 1.6 97 80 120 <br />Sample ID: C10070848-001AMSD 2 Sample Matrix Spike Duplicate Run: IC2-C_100728A 07/28/10 23:30 <br />Chloride 23.1 mg/L 1.0 100 80 120 1.6 20 <br />Sulfate 317 mg/L 1.6 98 80 120 0.4 20 <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />Page 15 of 25