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www.dret&b.com Helena, MT 677472 -0711 - Billings, MT 600 - 7354489 - Casper, WY 888- 235 -0515 <br />°Q Slate IM Gillette, WY 866 -686 -7175 - Rapid Cittr, SO 886- 672 -1225 - College Station, TX 888- 690 -2218 <br />QA /QC Summary Report <br />Prepared by Casper, WY Branch <br />Revised Date: 06/18/13 <br />Client: Cotter Corporation Report Date: 06/13/13 <br />Project: Schwartz 5/16/13 S26979 Work Order: 013050681 l <br />Analyte Count Result Units RL ° /aREC Low Limit High Limit RPD RPDLimit Qual <br />Method: E353.2 Analytical Run: SUB - 6205050 <br />Sample ID: ICV Initial Calibration Verification Standard 05/22/13 09:17 <br />Nitrogen, Nitrate +Nitrite as N 22.1 mg /L 0.060 102 90 110 <br />Method: E353.2 <br />Batch: B R205050 <br />Sample ID: MBLK <br />Method Blank <br />Run: SUB- B205050 <br />05/22/13 09:18 <br />Nitrogen, Nitrate +Nitrite as N <br />ND mg /L <br />0.005 <br />Sample ID: LFB <br />Laboratory Fortified Blank <br />Run: SUB - 8205050 <br />05/22/13 09:19 <br />Nitrogen, Nitrate +Nitrite as N <br />1.02 mg /L <br />0.010 <br />104 90 110 <br />Sample ID: 613051656- 001AMS <br />Sample Matrix Spike <br />Run: SUB- B205050 <br />05/22/13 09:58 <br />Nitrogen, Nitrate +Nitrite as N <br />1.10 mg /L <br />0.010 <br />102 90 110 <br />Sample ID: B13051656- 001AMSD <br />Sample Matrix Spike Duplicate <br />Run: SUB- B205050 <br />05/22/13 09:59 <br />Nitrogen, Nitrate +Nitrite as N <br />1.10 mg /L <br />0.010 <br />102 90 110 <br />0.1 10 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 18 of 25 <br />