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October 13,2020 Lab ID : STK2054077 Live Oak Geo Environmental Customer : 3-16608 Quality Control - Inorganic Constituent Method Date/ID T3 pe Cniis Conc. QC Data DQO Note Wet Chem Nitrate+Nitrite as N 4500N031- 10/03/20:211669jdd Blank mg/L ND <0.2 LCS mg/L 11.22 993% 80-120 MS mg/L 5.609 101% 5-285 (SP 2013590-001) MSD mg/L 5.609 101% 5-285 MSRPD mg/L 5.609 0.06% 530.4 450ONO3F 10103/20:215934JDD ICB mg/L 0.053 0.2 ICV mg/L 11.22 98.2% 90-110 CCB mg/L, 0.057 0.2 CCV mg/L 11.22 98.5% 90-110 itrateNitro en 450ONO3F 10/03/20:211669'dd Blank m /L ND <0.2 Definition ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. ICB :Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LES :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. Ms Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. O :Data Quality Objective-This is the criteria against which the quality control data is compared. Page 7 of 7