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cr + xww.energylao.rom j Helena, 14T 877-472-0711 . Billings, MT 800-735-4489 * Casper, WY 808-235-0515 <br />§ ?° Ma/yXplErca9anwSlaea 1951 Gillette, WY 866-686-7175 ° Rapid City, SD 888-672-1225 - College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwaider Water Monitoring Program-Discharge <br />Analyte Count Result Units <br />Method: E300.0 <br />Sample ID: LCS 2 Laboratory Control Sample <br />Chloride 9.43 mg/L <br />Sulfate 37.4 mg/L <br />Sample ID: MBLK 2 Method Blank <br />Chloride ND mg/L <br />Sulfate ND mg/L <br />Sample ID: C10090551-001AMS 2 Sample Matrix Spike <br />Chloride 77.5 mg/L <br />Sulfate 813 mg/L <br />Sample ID: C10090551-001AMSD 2 Sample Matrix Spike Duplicate <br />Chloride 77.9 mg/L <br />Sulfate 801 mg/L <br />Report Date: 10/04/10 <br />Work Order: C10090551 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Batch: R137451 <br />Run: IC2-C_100917A 09/17/1016:48 <br />1.0 94 90 110 <br />1.0 94 90 110 <br />Run: iC2-C 100917A <br />0.06 <br />0.2 <br />Run: IC2-C_100917A <br />1.0 100 80 120 <br />4.0 88 80 120 <br />Run: IC2-C_100917A <br />1.0 101 80 120 <br />4.0 82 80 120 <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />09/17/10 17:02 <br />09/17/10 17:45 <br />09/17/1018:00 <br />0.5 20 <br />1.4 20 <br />Page 15 of 22