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March 20,2019 Lab ID : STK1933304 <br /> Dwight J.Busalacchi Customer : 3-17015 <br /> Quality Control - Inorganic <br /> Constituent Method Date/1D Type Units Conc. QC Data DQO :Vote <br /> Wet Chem <br /> Nitrate+Nitrite as N 450ONO3F MS mg/L 28.18 37.7% 5-285 <br /> (STK1933304-001) MSD mg/L 28.18 37.8% 5-285 <br /> MSRPD m /L 28.18 0.1% 5-30.4 <br /> 450ONO3F 03/08/19:203372JDD CCB mg/L 0.119 0.2 <br /> CCV mg/L 11.27 95.7% 90-110 <br /> CCB mg/L 0.127 0.2 <br /> CCV I m /L 1 11.27 1 96.1% 1 90-110 <br /> Definition <br /> CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. <br /> CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. <br /> MS :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 /> MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation <br /> and analysis. <br /> DQO Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Page 8 of 8 <br />