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February 18,2020 Lab ID : STK2031881 <br /> Live Oak Geo Environmental Customer : 3-16608 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID type Units Conc. QC Data DQO Note <br /> Wet Chem <br /> Nitrate+Nitrite as N 450ONO3F MS mg/L 28.04 38.1% 5-285 <br /> (CC 2080418-002) MSD mg/L 28.04 38.2% 5-285 <br /> MSRPD m /L 28.04 0.1% S30.4 <br /> 4500NO3F 02/07/20:202058JMR CCB mg/L 0.138 0.2 <br /> CCV mg/L 11.22 95.6% 90-110 <br /> CCB mg/L 0.191 0.2 <br /> CCV I m /L 11.22 96.2% 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 /> O :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Page 6 of 6 <br />