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May 12, 2021 Lab ID : STK2135657 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/11) Type Units Conc. QC Data DQO Note Wet Chem Nitrate 300.0 (CH 2172862-002) MSD mg/L 40.00 102% 85-119 MSRPD m 10.00 1.4% <19 300.0 04/27/21:206329MCA CCB mg/L 0.000 0.5 CCV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 103% 1 90-110 Nitrate+ Nitrite as N 300.0 04/27/21:204541MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 04/27/21:204541MCA Blank mg/L ND <0.1 Nitrite 300.0 04/27/21:204541MCA Blank mg/L ND <0.5 LCS mg/L 15.00 101% 90-110 MS mg/L 30.00 101% 74-126 (CH 2172862-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.6% 520 MS mg/L 30.00 99.9% 74-126 (CH 2172862-002) MSD mg/L 30.00 102% 74-126 MSRPD m 10.00 1.9% <20 300.0 04/27/21:206329MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 102% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 101% 90-110 Nitrite Nitrogen 300.0 04/27/21:204541MCA Blank mg/L ND <0.2 Sulfate 300.0 04/27/21:204541MCA Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 104% 82-124 (CH 2172862-001) MSD mg/L 100.0 106% 82-124 MSRPD mg/L 10.00 1.7% _<23 MS mg/L 100.0 103% 82-124 (CH 2172862-002) MSD mg/L 100.0 106% 82-124 MSRPD mg/L 10.00 2.1% <23 300.0 04/27/21:206329MCA CCB mg/L 0.199 0.5 CCV mg/L 50.00 107% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 50.00 106% 90-110 MBAs 5540C 04/28/21:206370jba CCB mg/1 -0.0351 0.25 CCV mg/l 1.000 93.2% 90-110 CCB mg/1 -0.0351 0.25 CCV I mg/1 1.000 93.2% 1 90-110 MBAS Extraction 5540C 04/28/21:204727jba Blank mg/L ND <0.1 LCS mg/L 0.5000 93.2% 86-114 BS mg/L 0.5000 93.4% 86-114 BSD mg/L 0.5000 88.8% 86-114 BSRPD m /L 0.5000 5.0% <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. 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