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March 28,2019 <br /> Lab ID : STK1933761 <br />Live Oak Geo Environmental <br /> Customer : 3-16608 <br />Quality Control - Inorganic <br />Constituent Method Date/ED Type Units Conc. QC Data DQO Note <br />Wet Chem <br />Nitrate + Nitrite as N 4500NO3F MS mg/L 28.18 37.0 % 5-285 <br />(VI 1941130-001) MSD mg/L 28.18 37.9% 5-285 <br />MSRPD mg/L 28.18 23% <30.4 <br />4500NO3F 03/21/19:204062JDD CCB mg/L 0.078 0.2 <br />CCV mg/L 11.27 96.8 % 90-110 <br />CCB mg/L 0.154 0.2 <br />CCV mg/L 11.27 95.8% 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