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October 6, 2021 Lab ID : STK2153047 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 (STK2150623-004) MSD mg/L 40.00 102% 85-119 MSRPD m 10.00 0.05% 5519 300.0 09/14/21:214569njb CCB mg/1 0.00 0.5 CCV mg/1 20.00 101% 90-110 CCB mg/1 0.00 0.5 CCV mg/I 20.00 102% 90-110 Nitrate - Nitrite as N 300.0 09/14/21:210654NJB Blank m 0.023 0.1 Nitrate Nitrogen 300.0 09/14/21:210654NJB Blank m 0.023 0.1 Nitrite 300.0 09/14/21:210654NJB Blank mg/L ND <0.5 LCS mg/L 15.00 102% 90-110 MS mg/L 30.00 101% 74-126 (STK2150623-007) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 0.7% :520 MS mg/L 30.00 102% 74-126 (STK2150623-004) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 0.8% _520 300.0 09/14/21:214569njb CCB mg/I 0.00 0.5 CCV mg/1 15.00 102% 90-110 CCB mg/I 0.00 0.5 CCV m 15.00 101% 90-110 Nitrite Nitrogen 300.0 09/14/21:210654NJB Blank mg/l, ND <0.2 Sulfate 300.0 09/14/21:210654NJB Blank mg/L ND <0.5 LCS mg/L 50.00 103% 90-110 MS mg/L 100.0 91.7% 82-124 (STK2150623-007) MSD mg/L 100.0 92.1% 82-124 MSRPD mg/L 10.00 0.3% <_23 MS mg/L 100.0 98.5% 82-124 (STK2150623-004) MSD mg/L 100.0 98.7% 82-124 MSRPD m 10.00 0.1% :523 300.0 09/14/21:214569njb CCB mg/I 0.00 0.5 CCV mg/I 50.00 102% 90-110 CCB mg/I 0.188 0.5 CCV m 50.00 102% 90-110 BAS 5540C 09/14/21:212252jba CCB mg/I -0.0568 0.25 CCV mg/1 1.000 112% 90-110 360 CCB mg/l -0.0611 0.25 CCV m 1.000 111% 90-110 360 MBAS Extraction 5540C 09/14/21:210884jba Blank mg/L ND <0.1 LCS mg/L 0.5000 112% 86-114 BS mg/L 0.5000 107% 86-114 BSD mg/L 0.5000 108% 86-114 BSRPD TZZL 0.5000 0.8% <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