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May 5, 2021 Lab ID : STK2135171 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 2142834-001) MSD mg/L 40.00 88.3% 85-119 MSRPD m 10.00 1.3% <19 300.0 04/16/21:205853MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 103% 90-110 Nitrate+Nitrite as N 300.0 04/16/21:204132MCA Blank mg/L ND <0.I Nitrate Nitrogen 300.0 04/16/21:204132MCA Blank m ND <0.1 Nitrite 300.0 04/16/21:204132MCA Blank mg/L ND <0.5 LCS mg/L 15.00 102% 90-110 MS mg/L 30.00 102% 74-126 (STK2135171-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.2% <20 MS mg/L 30.00 100% 74-126 (VI 2142834-001) MSD mg/L 30.00 104% 74-126 MSRPD m 10.00 3.2% <20 300.0 04/16/21:205853MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 102% 90-110 CCB mg[L 0.000 0.5 CCV mg/L 15.00 103% 90-110 Nitrite Nitrogen 300.0 04/16/21:204132MCA Blank mg/L ND <0.2 Sulfate 300.0 04/16/21:204132MCA Blank mg/L ND <0.5 LCS mg/L 50.00 107% 90-110 MS mg/L 100.0 106% 82-124 (STK2135171-001) MSD mg/L 100.0 107% 82-124 MSRPD mg/L 10.00 1.4% <23 MS mg/L 100.0 100% 82-124 (VI 2142834-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 2.6% <23 300.0 04/16/21:205853MCA ICB mg/L 0.000 0.5 ICV mg/L 50.00 107% 90-110 CCB mg/L 0.208 0.5 CCV mg/L 50.00 107% 90-110 MBAs 5540C 04/16/21:206003jba CCB mg/L -0.0393 0.25 CCV mg/L 1.000 97.8% 90-110 CCB mg/L -0.0393 0.25 CCV mg/L 1.000 97.8% 1 90-110 MBAs Extraction 5540C 04/16/21:204476jba Blank mg/L ND <0.1 LCS mg/L 0.5000 97.4% 86-114 BS mg/L 0.5000 93.4% 86-114 BSD mg/L 0.5000 96.3% 86-114 BSRPD m 0.5000 0.015 <0.1 Definition ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. 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