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August 6, 2021 Lab ID : STK2139969 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 Nitrite 300.0 07/16/21:207998MCA LCS mg/L 15.00 99.2% 90-110 MS mg/L 30.00 102% 74-126 (STK2 139973-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 0.9% <20 300.0 07/16/21:211044MCA CCB mg/L 0.000 0.5 , CCV mg/L 15.00 98.0% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 97.7% 90-110 Nitrite Nitrogen 300.0 07/16/21:207998MCA Blank mg/L ND <0.2 Sulfate 300.0 07/16/21:207998MCA Blank mg/L ND <0.5 LCS mg/L 50.00 96.8% 90-110 MS mg/L 100.0 97.0% 82-124 (STK2139973-001) MSD mg/L 100.0 98.2% 82-124 MSRPD mg/L 10.00 1.2% 23 300.0 07/16/21:211044MCA CCB mg/L 0.153 0.5 CCV mg/L 50.00 95.2% 90-110 CCB mg/L 0.147 0.5 CCV mg/L 50.00 95.1% 90-110 NIBAS 5540C 07/16/21:210982jba CCB mg/L -0.0310 0.25 CCV mg/L 1.000 97.0% 90-110 CCB mg/L -0.0185 0.25 CCV mg/L 1.000 97.4% 90-110 MBAS Extraction 5540C 07/16/21:208150jba Blank mg/L ND <0.1 LCS mg/L 0.5000 97.0% 86-114 BS mg/L 0.5000 94.7% 86-114 BSD mg/L 0.5000 95.9% 86-114 BSRPD mg/L 0.5000 0.0062 50.1 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. Du p : 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-dctcct - Result was below the DQO listed for the analyte. DQO : Data Quality Objective - This is the criteria against which the quality control data is compared. Page 8 of 8