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May 5, 2021 Lab ID : STK2135321 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 (VI 2142896-001) MSD mg/L 40.00 97.3% 85-119 MSRPD mg/L 10.00 0.1% <19 300.0 04/21/21:205910MCA CCB mg/L 0.076 0.5 CCV mg/L 20.00 102% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 102% 90-110 Nitrate+Nitrite as N 300.0 04/21/21:204260MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 04/21/21:204260MCA Blank mg/L ND <0.1 itrite 300.0 04/21/21:204260MCA Blank mg/L ND <0.5 LCS mg/L 15.00 102% 90-110 MS mg/L 30.00 102% 74-126 (STK2135321-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 0.7% <_20 Ms mg/L 30.00 102% 74-126 (VI 2142896-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 0.3% <20 300.0 04/21/21:205910MCA CCB mg/L 0.060 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 04/21/21:204260MCA Blank mg/L ND <0.2 Sulfate 300.0 04/21/21:204260MCA Blank mg/L ND <0.5 LCS mg/L 50.00 107% 90-110 MS mg/L 100.0 104% 82-124 (STK2135321-001) MSD mg/L 100.0 105% 82-124 MSRPD mg/L 10.00 0.5% :523 MS mg/L 100.0 103% 82-124 (VI 2142896-001) MSD mg/L 100.0 103% 82-124 MSRPD m 10.00 0.3% <23 300.0 04/21/21:205910MCA CCB mg/L 0.211 0.5 CCV mg/L 50.00 106% 90-110 CCB mg/L 0.203 0.5 CCV mg/L 50.00 106% 90-110 MBAs 5540C 04/21/21:206004jba CCB mg/L -0.0268 0.25 CCV mg/L 1.000 97.4% 90-110 CCB mg/L -0.0143 0.25 CCV mg/L 1.000 97.4% 90-110 MBAs Extraction 5540C 04/21/21:204477jba Blank mg/L ND <0.1 LCS mg/L 0.5000 97.0% 86-114 BS mg/L 0.5000 97.2% 86-114 BSD mg/L 0.5000 99.2% 86-114 BSRPD mg/L 0.5000 2.1% <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