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June 23, 2021 Lab ID : STK2137082 San Joaquin Co.Environmental Health Dep Customer : 3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Conc. QC Data DQO Note Wet Chem Nitrate+Nitrite as N 450ONO3F (SP 2106711-001) MSD mg/L 5.609 96.0% 5-285 MSRPD m 5.609 0.1% :530.4 450ONO3F 05/20/21:207567VVH CCB mg/L 0.088 0.2 CCV mg/L 11.22 97.0% 90-110 CCB mg/L 0.162 0.2 CCV mg/L 11.22 96.7% 90-110 Nitrate as NO3 450ONO3F 05/20/21:205642VVH Blank m L ND <0.9 Nitrate Nitrogen 450ONO3F 05/20/21:205642VVH Blank mg/L ND <0.2 Nitrite as Nitrogen 450ONO3F 05/20/21:205643VVH Blank mg/L ND <0.2 LCS mg/L 1.218 100% 80-120 MS mg/L 0.6090 98.0% 50-150 (SP 2106711-001) MSD mg/L 0.6090 98.9% 50-150 MSRPD m 0.6090 0.0050 50.2 450ONO3F 05/20/21:207564VVH CCB mg/L 0.00800 0.012 CCV mg/L 1.218 101% 90-110 CCB mg/L 0.00800 0.012 CCV mg/L 1.218 101% 90-110 MBAS 55400 05/20/21:208000jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 96.1% 90-110 CCB mg/L -0.0351 0.25 CCV m 1.000 1 96.1% 90-110 MBAS Extraction 5540C 05/20/21:20594Ijba Blank mg/L ND <0.1 LCS mg/L 0.5000 94.9% 86-114 BS mg/L 0.5000 92.1% 86-114 BSD mg/L 0.5000 94.2% 86-114 BSRPD m L 0.5000 0.010 1 <0.1 Definition 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. LCS :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. BS :Blank Spikes-A blank is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. BSD :Blank Spike Duplicate of BS/BSD pair-A blank duplicate is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. BSRPD :BS/BSD Relative Percent Difference(RPD)-The BS 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. <1/4 :High Sample Background-Spike concentration was less than one forth of the sample concentration. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. Explanation -435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 8 of 8