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: Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br />: Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />: Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br />: Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />: Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample <br />matrix affects analyte recovery. <br />: Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyted. The recoveries <br />are an indication of how that sample matrix affects analyte recovery. <br />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br />and analysis. <br />: Data Quality Objective - This is the criteria against which the quality control data is compared. <br />Definition <br />ICV <br />ICB <br />CCV <br />CCB <br />MS <br />MSD <br />MSRPD <br />DQO <br />September 13, 2017 <br />Lab ID : STK1750879 <br />Kimberly Martin Customer : 3-18039 <br />Quality Control - Inorganic <br />Constituent Method Date/1 D Type Units Cone. QC Data DQO Note <br />Wet Chem <br />Nitrate + Nitrite as N 4500NO3F MS mg/L 28.04 39.0% 5-285 <br />(VI 1744387-001) MSD mg/L 28.04 40.2 % 5-285 <br />MSRPD mg/L 28.04 1.3% <30.4 <br />4500NO3F 08/29/17:212993JDD ICB mg/L 0.029 0.1 <br />ICV mg/L 11.22 96.5 % 90-110 <br />CCB mg/L 0.060 0.1 <br />CCV mg/L 11.22 94.9% 90-110 <br />Page 8 of 8