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December 30, 2021 Lab ID : STK2157908 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 (SP 2117787-003) MSD mg/L 40.00 101% 85-119 MSRPD mg/L 10.00 8.5% 519 300.0 12/16/21:219610njb CCB mg/l 0.00 0.5 CCV mg/l 20.00 99.0% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 20.00 98.9% 90-110 itrate + Nitrite as N 300.0 12/16/21:214499NJB Blank m ND <0.1 Nitrate Nitrogen 300.0 12/16/21:214499NJB Blank m ND <0.1 Nitrite 300.0 12/16/21:214499NJB Blank mg/L ND <0.5 LCS mg/L 15.00 99.9% 90-110 MS mg/L 30.00 90.4% 74-126 (SP 2117922-001) MSD 1119/L 30.00 101% 74-126 MSRPD mg/L 10.00 11.00/0 5520 MS mg/L 30.00 92.1% 74-126 (SP 2117787-003) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 9.9% :520 300.0 12/16/21:219610njb CCB mg/] 0.00 0.5 CCV mg/l 15.00 99.4% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 15.00 99.0% 90-110 Nitrite Nitrogen 300.0 12/16/21:214499NJB Blank m ND <0.2 Sulfate 300.0 12/16/21:214499NJB Blank mg/L ND <0.5 LCS mg/L 50.00 t01 % 90-110 MS mg/L 100.0 87.6% 82-124 (SP 2117922-001) MSD mg/L 100.0 97.9% 82-124 MSRPD mg/L 10.00 8.8% 5_23 MS mg/L 100.0 89.1% 82-124 (SP 2117787-003) MSD mg/L 100.0 98.7% 82-124 MSRPD mg/L 10.00 1 8.8% 523 300.0 12/16/21:219610njb CCB mg/l 0.133 0.5 CCV mg/l 50.00 101%0 90-110 CCB mg/l 0.144 0.5 CCV mg/l 50.00 101% 90-110 MBAS 5540C 12/17/21:219886JBA CCB mg/l -0.0611 0.25 CCV mg/l 1.000 104% 90-110 CCB mg/l -0.0611 0.25 CCV mg/l 1.000 103% 90-110 MBAS Extraction 5540C 12/17/21:214865JBA Blank mg/L ND <0.1 LCS mg/L 0.5000 103% 86-114 BS mg/L 0.5000 101% 86-114 BSD mg/L 0.5000 99.8% 86-114 BSRPD m 0.5000 1.3% <5 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. : 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 recovery. Page 8 of 9