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April 24,2020 Lab ID : STK2035034 <br /> Live Oak Geo Environmental Customer : 3-16608 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Wet Chem <br /> Nitrate+Nitrite as N 450ONO3F MS mg/L 28.04 34.2% 5-285 <br /> (STK2034962-001) MSD mg/L 28.04 35.4% 5-285 <br /> MSRPD m /L 28.04 3.5% 530.4 <br /> 450ONO3F 04/15/20:205749VVH CCB mg/L 0.139 0.2 <br /> CCV mg/L 11.22 95.6% 90-110 <br /> CCB mg/L 0.182 0.2 <br /> CCV 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 /> l)Q0 :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Page 7 of 7 <br />