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Trust our People Trust our Data. Billings,MT 600.735.4489•Casper,WY 888.235.0515 • pr'F"- °"' College Station,TX 888.690.2218•Gillette,WY 866.686.7175•Helena,MT 877.472.0711 QA/QC Summary Report Prepared by Casper,WY Branch Client: Cotter Corporation Report Date: 08/11/16 Project: Schwartz-GW 7/27/16 S29116 Work Order: C16070974 l [Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Clual Method: E200.8 Analytical Run: ICPMS4-C_160803A Lab ID: ICV 5 Initial Calibration Verification Standard 08/03/16 14:12 Aluminum 0.0509 mg/L 0.0010 102 90 110 Antimony 0.0511 mg/L 0.0010 102 90 110 Copper 0.0504 mg/L 0.0010 101 90 110 Silver 0.0192 mg/L 0.0010 96 90 110 Thallium 0.0483 mg/L 0.0010 97 90 110 Method: E200.8 Batch:47994 Lab ID: MB-47994 5 Method Blank Run: ICPMS4-C_160803A 08/04/16 11:15 Aluminum 0.009 mg/L 0.0001 Antimony ND mg/L 5E-05 Copper 0.0004 mg/L 3E-05 Silver ND mg/L 5E-05 Thallium ND mg/L 2E-05 Lab ID: LCS3-47994 5 Laboratory Control Sample Run:ICPMS4-C_160803A 08/04/16 11:22 Aluminum 2.57 mg/L 0.030 103 85 115 Antimony 0.542 mg/L 0.0010 108 85 115 Copper 0.501 mg/L 0.0050 100 85 115 Silver 0.0475 mg/L 0.0010 95 85 115 Thallium 0.430 mg/L 0.00050 86 85 115 Lab ID: C16070992-001AMS3 5 Sample Matrix Spike Run:ICPMS4-C_160803A 08/04/16 15:08 Aluminum 2.63 mg/L 0.030 104 70 130 Antimony 0.548 mg/L 0.0010 110 70 130 Copper 0.793 mg/L 0.0050 159 70 130 S Silver 0.0488 mg/L 0.0010 98 70 130 Thallium 0.478 mg/L 0.00050 96 70 130 Lab ID: C16070992-001AMSD 5 Sample Matrix Spike Duplicate Run: ICPMS4-C_160803A 08/04/16 15:14 Aluminum 2.69 mg/L 0.030 106 70 130 2.2 20 Antimony 0.555 mg/L 0.0010 111 70 130 1.2 20 Copper 0.809 mg/L 0.0050 162 70 130 2.0 20 S Silver 0.0527 mg/L 0.0010 105 70 130 7.8 20 Thallium 0.485 mg/L 0.00050 97 70 130 1.3 20 Qualifiers: RL-Analyte reporting limit. ND-Not detected at the reporting limit. MDC-Minimum detectable concentration S-Spike recovery outside of advisory limits. Page 5 of 15