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April 30,2021 Lab ID : STK2135320 <br /> Live Oak Geo Environmental Customer : 3-16608 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID 1y PC Units Cone. QC Data DQO Note <br /> Wet Chem <br /> Nitrate+Nitrite asN 450ONO3F 04/21/21:204321VVH Blank mg/L ND <0.2 <br /> LES mg/L 11.22 102% 80-120 <br /> MS mg/L 5.609 101% 5-285 <br /> (CH 2172688-001) MSD mg/L 5.609 103% 5-285 <br /> MSRPD mg/L 5.609 1.0% Si0.4 <br /> 450ONO3F 04/21/21:205851 V V H CCB mg/L 0.059 0.2 <br /> CCV mg/L 11.22 99.5% 90-110 <br /> CCB mg/L 0.094 0.2 <br /> CCV mg/L 11.22 984% 90-110 <br /> itrateNitrogen 450ONO3F 04121/21:204321VVH Blank ELL_ 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 6 of 6 <br />