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March 15, 2021 Lab ID : STK2132323 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone QC Data DQO Note Wet Chem Nitrate 300.0 (STK2132323-001) MSD mg/L 40.00 103% 85-119 MSRPD m 10.00 0.9% <19 300.0 02/17/21:202460MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 105% 90-110 Nitrate + Nitrite as N 300.0 02/17/21:201764MCA Blank -91L ND <0.1 Nitrate Nitrogen 300.0 02/17/21:201764MCA Blank m ND <0.1 Nitrite 300.0 02/17/21:201764MCA Blank mg/L ND <0.5 LCS mg/L 15.00 104% 90-110 MS mg/L 30.00 103% 74-126 (VI 2141148-001) MSD m9/1- 30.00 104% 74-126 MSRPD mg/L, 10.00 0.4% 520 MS mg/L 30.00 104% 74-126 (STK2132323-001) MSD mg/L 30.00 105% 74-126 MSRPD mg1l, 10.00 1.1% :520 300.0 02/17/21:202460MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 104% 90-110 CCB mg/L 0.000 0.5 CCV in 15.00 104% 90-110 Nitrite Nitrogen 300.0 02/17/21:201764MCA Blank m ND <0.2 Sulfate 300.0 02/17/21:201764MCA Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 94.9% 82-124 (VI 2141148-001) MSD mg/L 100.0 95.7% 82-124 MSRPD mg/L 10.00 0.5% 523 MS mg/L 100.0 102% 82-124 (STK2132323-001) MSD mg/L 100.0 103% 82-124 MSRPD mg1L 10.00 0.9% <_23 300.0 02/17/21:202460MCA ICB mg/L 0.199 0.5 ICV mg/L 50.00 105% 90-110 CCB mg/L 0.203 0.5 CCV mg/L 50.00 106% 90-110 BAS 55400 02/18/21:202772AMM CCB mg/L -0.0359 0.25 CCV mg/L 1.000 107% 90-110 CCB mg/L -0.0400 0.25 CCV mg/L 1.000 106% 1 90-110 MBAs Extraction 55400 02/18/21:202042JBA Blank mg/L ND <0.1 LCS mg/L 0.5000 106% 86-114 BS mg/L 0.5000 105% 86-114 BSD mg/L 0.5000 104% 86-114 BSRPD 2&/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. : Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample MS matrix affects analyte recovery. : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyte. The recoveries MSD are an indication of how that sample matrix affects analyte recovery. : Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not BS affecting analyte reco\,ery. Page 8 of 9