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June 19, 2019 Lab ID : STK1937486 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Wet Chem <br /> Nitrate+Nitrite as N 450ONO3F NIS mg/L 28.18 38.5% 5-285 <br /> (VI 1942434-001) MSD mg/L 28.18 38.8% 5-285 <br /> MSRPD mg/L 28.18 0.6% <30.4 <br /> 450ONO3F 05/24/19:207921JDD CCB mg/L 0.119 0.2 <br /> CCV mg/L 11.27 98.0% 90-110 <br /> CCB mg/L 0.148 0.2 <br /> CCV in 11.27 98.1% 90-110 <br /> Nitrite as Nitrogen 450ONO3F 05/24/19:207920]DD CCB mg/L 0.01200 0.012 <br /> CCV mg/L 1.218 99.1% 90-110 <br /> CCB mg/L 0.01100 0.012 <br /> CCV mg/L 1.218 98.8% 90-110 <br /> MBAs 5540C 05/24/19:207846jba CCB mg/L 0.000 0.1 <br /> CCV mg/L 0.1000 100% 99-101 <br /> MBAS Screen 5540C MS mg/L 0.1000 100% 90-110 <br /> (CC 1981595-001) MSD mg/L 0.1000 100% 90-110 <br /> MSRPD m 0.1000 0.0 <0.1 <br /> Definition <br /> ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. <br /> ICB :Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. <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 /> Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an <br /> indication of precision for the preparation and analysis. <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 /> Explanation <br /> 435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> 440 :Sample nonhomogeneity may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 8 of 8 <br />