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February 10, 2021 Lab ID : STK2131176 <br /> Brad Christy Customer : 3-18673 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br /> Wet Client <br /> Nitrate r Nitrite as N 450ONO3F 01/27121:200938VVH Blank mg/L ND <0.2 <br /> LES mg/L 11.22 98.3% 80-120 <br /> MS mg/L 5.609 105% 5-285 <br /> (CH 2170535-001) MSD mg/L 5.609 98.4% 5-285 <br /> MSRPD mgjL 5.609 5.3% 530.4 <br /> 450ONO3F 01/27/21:201294VVH CCB mg/I, 0.035 0.2 <br /> CCV mg/L 11.22 96.9% 90-110 <br /> CCB mg/L 0.135 0.2 <br /> CCV m L 11.22 96.7% 90-110 <br /> Nitrate Nitrogen 450ONO3F 01/27/21:200938VVH Blank m 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 /> Blink :Method Blank-Prepared to verifv 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 /> -44S :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 :biS/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 a ainst which the quality conuol data is compared. <br /> Page 7 01'7 <br />