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September 22, 2021 Lab ID : STK2152566 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 (STK2150620-024) MSD mg/L 40.00 100% 85-119 MSRPD mg/L 10.00 0.03% _<19 300.0 09/03/21:213977njb CCB mg/L 0.000 0.5 CCV mg/L 20.00 99.4% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 99.6% 90-110 Nitrate+Nitrite as N 300.0 09/03/21:210232NJB Blank mg/L I ND <0.I Nitrate Nitrogen 300.0 09/03/21:210232NJB Blank mg/L ND <0.1 Nitrite 300.0 09/03/21:210232NJB Blank mg/L ND <0.5 LCS mg/L 15.00 100% 90-110 MS mg/L 30.00 102% 74-126 (STK2150620-020) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 0.2% _<20 MS mg/L 30.00 102% 74-126 (STK2150620-024) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1 0.5% <20 300.0 09/03/21:213977njb CCB mg/L 0.000 0.5 CCV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 102% 90-110 Nitrite Nitrogen 300.0 09/03/21:210232NJB Blank m ND <0.2 Sulfate 300.0 09/03/21:210232NJB Blank mg/L ND <0.5 LCS mg/L 50.00 99.5% 90-110 MS mg/L 100.0 98.2% 82-124 (STK2150620-020) MSD mg/L 100.0 98.5% 82-124 MSRPD mg/L 10.00 0.3% <23 MS mg/L 100.0 96.8% 82-124 (STK2150620-024) MSD mg/L 100.0 97.1 % 82-124 MSRPD m 10.00 1 0.3% <23 300.0 09/03/21:213977njb CCB mg/I. 0.180 0.5 CCV mg/L 50.00 100% 90-110 CCB mg/L 0.297 0.5 CCV mg/L 50.00 100% 90-110 MBAs 5540C 09/03/21:213884jba CCB mg/I -0.0611 0.25 CCV mg/I 1.000 112% 90-110 360 CCB mg/I -0.0393 0.25 CCV mg/I 1.000 1 112% 90-110 360 MBAs Extraction 5540C 09/03/21:210315jba Blank mg/L ND <0.1 LCS mg/L 0.5000 112% 86-114 BS mg/L 0.5000 106% 86-114 BSD mg/L 0.5000 114% 86-114 BSRPD m 0.5000 7.1% _<5 410 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 9 of 10