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July 12,2019 Lab ID : STK1939671 <br /> Live Oak Geo Environmental Customer : 3-16608 <br /> Quality Control - Inorganic <br /> Constituent Method Date/l1) Type Units Conc. QC Data DQO Note <br /> Wet Chem <br /> Nitrate+Nitrite as N 450ONO3F MS mg/L 28.04 37.0% 5-285 <br /> (STK1939543-001) MSD mg/L 28.04 373% 5-285 <br /> MSRPD m /L 28.04 0.5% 1 <30.4 <br /> 4500N031 07/03/19:209989JMR CCB mg/L -0.004 0.2 <br /> CCV mg/L 11.22 92.2% 90-110 <br /> CCB mg/L 0.017 0.2 <br /> CCV TILL 11.22 94.1 % 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 7 of 7 <br />