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July 14, 2021 Lab ID : STK2138920 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control - Inorganic Constituent Method Date/1D Type Units Conc. QC Data DQO Note Wet Chem Nitrate 300.0 (V12144773-002) MSD mg/L 40.00 103% 85-119 MSRPD mg/L 10.00 0.9% <19 300.0 06/25/21:209708MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 98.6% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 98.3% 90-110 Nitrate + Nitrite as N 300.0 06/25/21 :207151MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 06/25/21 :207151MCA Blank mg/L ND <0.1 Nitrite 300.0 06/25/21 :207151MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 103% 74-126 (V12144773-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 1.1% 20 MS mg/L 30.00 102% 74-126 (V12144773-002) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.2% 20 300.0 06/25/21:209708MCA ICB mg/L 0.000 0.5 ICV mg/L 15 00 100% 90-110 CCB mg/L 0.000 0.5 CCV mg/L I 5(t) 99.7% 90-110 Nitrite Nitrogen 300.0 06/25/21:207151MCA Blank mg/L ND <0.2 Sulfate 300.0 06/25/21:207151MC A Blank mg/L ND <0.5 LCS mg/L 50.00 103% 90-110 MS mg/L 100.0 101% 82-124 (V12144773-001) MSD mg/L 100.0 103% 82-124 MSRPD mg/L 10.00 1.2% 23 MS mg/L 100.0 101 % 82-124 (VI 2144773-002) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 0.6% 23 300.0 06/25/21:209708MCA ICB mg/L 0.000 0.5 ICV mg/L 50.00 99.5% 90-110 CCB mg/L 0.193 0.5 CCV mg/L 50.00 99.7% 90-110 N1BAS 5540C 06/25/21:210243JBA CCB mg/L -0.0393 0.25 CCV mg/L 1.000 109% 90-110 CCB mg/L -0.0393 0.25 CCV mg/L 1.000 106% 90-110 MBAS Extraction 5540C 06/25/21:207589JBA Blank mg/L ND <0.1 LCS mg/L 0.5000 106% 86-114 BS mg/L 0.5000 110% 86-114 BSD mg/L 0.5000 110% 86-114 BSRPD mg/L 0.5000 0.8% <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