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August 4, 2021 Lab ID : STK2139748 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 300.0 (VI 2145286-009) MSD mg/L 40.00 101% 85-119 MSRPD m 10.00 2.5% 4519 300.0 07/13/21:210681MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 95.6% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 96.3% 1 90-110 Nitrate+ Nitrite as 300.0 07/13/21:207856MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 07/13/21:207856MCA Blank mg/L ND <0.1 Nitrite 300.0 07/13/21:207856MCA Blank mg/L ND <0.5 LCS mg/L 15.00 101% 90-110 MS mg/L 30.00 101 % 74-126 (STK2139751 -00 1) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.6% 420 MS mg/L 30.00 98.7% 74-126 (VI 2145286-009) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 2.7% 4_20 300.0 07/13/21:210681MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 97.3% 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 97.3% 90-110 Nitrite Nitrogen 300.0 07/13/21:207856MCA Blank mg/L ND <0.2 Sulfate 300.0 07/13/21:207856MCA Blank mg/L ND <0.5 LCS mg/L 50.00 97.8% 90-110 MS mg/L 100.0 93.4% 82-124 (STK2139751-001) MSD mg/L 100.0 94.9% 82-124 MSRPD mg/L 10.00 1.6% 423 MS mg/L 100.0 94.2% 82-124 (VI 2145286-009) MSD mg/L 100.0 97.0% 82-124 MSRPD mg/L 10.00 2.5% <23 300.0 07/13/21:210681MCA ICB mg/L 0.000 0.5 ICV mg/L 50.00 94.5% 90-110 CCB mg/L 0.150 0.5 CCV mg/L 50.00 94.7% 90-110 BAS 5540C 07/14/21:210981jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 109% 90-110 CCB mg/L -0.0268 0.25 CCV mg/L 1.000 110% 1 90-110 MBAs Extraction 5540C 07/14/21:208149jba Blank mg/L ND <0.1 LCS mg/L 0.5000 110% 86-114 BS mg/L 0.5000 107% 86-114 BSD mg/L 0.5000 106% 86-114 BSRPD m 0.5000 1.2% <5 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. 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. Page 8 of 9