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Helena, MT 877 -472 -0711 - Billings, MT 800 -735 -4489 - Casper, WY 888- 235 -0515 <br />®-www.ew&ab.com <br />AuglkilfxeeJAenae&M 1832 — — Gillette, WY 866 - 686 -7175 - Rapid City, SD 888 - 672 -1225 - College Station, <br />TX 808 -690 -2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: <br />02/06/13 <br />Project: Schwartz GW 1/22/13 SSTF: S26783 Work Order: <br />013010694 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD <br />RPDLimit Qual <br />Method: A2540 C <br />Batch: TDS 130124A <br />Sample ID: MB- 1_130124A Method Blank Run: BAL- 16_130124A <br />01/24/13 15:04 <br />Solids, Total Dissolved TDS @ 180 C ND mg /L 10 <br />Sample ID: LCS- 2_130124A Laboratory Control Sample Run: BAL- 16_130124A <br />01/24/13 15:05 <br />Solids, Total Dissolved TDS @ 180 C 1970 mg /L 20 99 90 110 <br />Sample ID: C13010580 -002A DUP Sample Duplicate Run: BAL- 16_130124A <br />01/24/13 15:06 <br />Solids, Total Dissolved TDS @ 180 C 4740 mg /L 40 2.2 <br />5 <br />Sample ID: C13010682 -001A MS Sample Matrix Spike Run: BAL- 16_130124A <br />01/24/13 15:07 <br />Solids, Total Dissolved TDS @ 180 C 4600 mg /L 20 101 90 110 <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />Page 6 of 19 <br />