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All www.erwDlob.com Helena, MT $77- 472 -0711 • Billings, MT 800 - 735 -4489 - Casper, WY 888- 235 -8515 <br />A j" E=ohm Stec' 112 Gillette, WY 868 -A88 -1175 •Rapid City, SD 888 -872 -1225 •College Station, TX 886 -890 -2218 <br />QA /QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: <br />Cotter Corporation <br />Report Date: <br />06/13/13 <br />Project: <br />Schwartz GW 5/20/13 S26987 & S26988 <br />Work Order: <br />013050760 <br />Analyte <br />Count Result Units <br />RL <br />%REC <br />Low Limit High Limit RPD <br />RPDLimit Qual� <br />Method: <br />E245.1 <br />Analytical Run: CVAA_C203_130529A <br />Sample ID: <br />ICV <br />Initial Calibration Verification Standard <br />05/29/13 15:29 <br />Mercury <br />0.00499 mg /L <br />0.00020 <br />100 <br />90 110 <br />Method: <br />E245.1 <br />Batch: 37671 <br />Sample ID: <br />MB -37671 <br />Method Blank <br />Run. CVAA C203 130529A <br />05/29/13 15:48 <br />Mercury <br />ND mg /L <br />7E -05 <br />Sample ID: <br />LCS -37671 <br />Laboratory Control Sample <br />Run: CVAA_C203_130529A <br />05/29/13 15:49 <br />Mercury <br />0.00520 mg /L <br />0.00010 <br />104 <br />80 120 <br />Sample ID: <br />C13050721 -001 DMS <br />Sample Matrix Spike <br />Run: CVAA_C203_130529A <br />05/29/13 16:08 <br />Mercury <br />000515 mg /L <br />0.00010 <br />103 <br />70 130 <br />Sample ID: <br />C13050721 -001 DMSD <br />Sample Matrix Spike Duplicate <br />Run: CVAA_C203_130529A <br />05/29/13 16:16 <br />Mercury <br />0.00500 mg /L <br />0.00010 <br />100 <br />70 130 3.0 <br />10 <br />Method: E245.1 Batch: R174153 <br />Sample ID: IPC Instrument Performance Check Sample Run: CVAA_C203_130529A 05/29/13 15:33 <br />Mercury 0.00511 mg /L 0.00020 102 95 105 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 15 of 24 <br />