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www.e wqr ab.com Helena, Mr 677-472-0711 • Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />1?it Gillette, wY 666-686-7175 • Rapid City, SD 886-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 04/19/11 <br />Project: Schwartz GW 3/24/11 S25646 & S25647 Work Order: C11030817 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E353.2 Analytical Run: SUB-B163324 <br />Sample ID: ICV Initial Calibration Verification Standard 03/30/11 10:22 <br />Nitrogen, Nitrate+Nitrite as N 22.8 mg/L 0.20 104 90 110 <br />Method: E353.2 Batch: B_R163324 <br />Sample ID: C11030817-002G Sample Matrix Spike Duplicate Run: SUB-6163324 03/30/11 11:22 <br />Nitrogen, Nitrate+Nitrite as N 1.53 mg/L 0.010 109 90 110 0.2 10 <br />Sample ID: C11030817-002G Sample Matrix Spike Run: SUB-B163324 03/30/11 11:20 <br />Nitrogen, Nitrate+Nitrite as N 1.52 mg/L 0.010 109 90 110 <br />Sample ID: LFB Laboratory Fortified Blank Run: SUB-131 63324 03/30/11 10:24 <br />Nitrogen, Nitrate+Nitrite as N 1.07 mg/L 0.010 109 90 110 <br />Sample ID: MBLK Method Blank Run: SUB-6163324 03/30/11 10:23 <br />Nitrogen, Nitrate+Nitrite as N ND mg/L 0.10 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 18 of 26