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December 15, 2020 Lab ID : STK2056922 <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 4500NO3F 12/08/20:214404V V H Blank mg/L ND <0.2 <br />LCS mg/L 11.22 99.7% 80-120 <br />MS mg/L 5.609 102% 5-285 <br />(SP 2016867-001) MSD mg/L 5.609 103% 5-285 <br />MSRPD mg/L 5.609 0.6% <30.4 <br />4500NO3F I 2/08/20:219576V V H CCB mg/L 0.066 0.2 <br />CCV mg/L 11.22 99.1 % 90-110 <br />CCB mg/L 0.037 0.2 <br />CCV mg/L 11.22 99.2% 90-110 <br />Nitrate Nitrogen 4500NO3F 12/08/20:214404VVH Blank mg/L ND <0.2 <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 />Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />LCS : Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <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 />ND : Non-detect - Result was below the DQO listed for the analyte. <br />DQO : Data Quality Objective - This is the criteria against which the quality control data is compared. <br />Page 7 of 7