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September 9, 2021 Lab ID : STK2151149 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 (STK2151151-001) MSD mg/L 40.00 94.8% 85-119 MSRPD mg/L 10.00 0.4% <19 300.0 08/07/21:212315MCA CCB mg/L 0.000 0.5 CCV mg/L 20.00 98.6% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 98.8% 90-110 Nitrate+Nitrite as N 300.0 08/06/21:208972MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 08/06/21:208972MCA Blank mg/L ND <0.1 Nitrite 300.0 08/06/21:208972MCA Blank mg/L ND <0.5 LCS mg/L 15.00 96.3% 90-110 MS mg/L 30.00 99.1 % 74-126 (STK2151149-001) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 1.5% <20 MS mg/L 30.00 99.6% 74-126 (STK2151151-001) MSD mg/L 30.00 101 % 74-126 MSRPD mgfL 10.00 1.4% <20 300.0 08/07/21:212315MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 96.1 % 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 96.3% 90-110 Nitrite Nitrogen 300.0 08/06/21:208972MCA Blank m ND <0.2 Sulfate 300.0 08/06/21:208972MCA Blank mg/L ND <0.5 LCS mg/L 50.00 102% 90-110 MS mg/L 100.0 104% 82-124 (STK2151149-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 0.8% <_23 MS mg/L 100.0 103% 82-124 (STK2151151-001) MSD mg/L 100.0 104% 82424 MSRPD mg/L 10.00 1.2% <23 300.0 08/07/21:212315MCA CCB mg/L 0.148 0.5 CCV mg/L 50.00 102% 90-110 CCB mg/L 0.144 0.5 CCV m 50.00 102% 90-110 BAS 5540C 08/06/21:212239jba CCB mg/L -0.0393 0.25 CCV mg/L 1.000 99.5% 90-110 CCB mg/L -0.0310 0.25 CCV m 1.000 97.4% 1 90-110 BAS Extraction 5540C 08/06/21:209085jba Blank mg/L ND <0.1 LCS mg/L 0.5000 99.1% 86-114 BS mg/L 0.5000 96.3% 86414 BSD mg/L 0.5000 101% 86-114 BSRPD m 0.5000 5.0% <5 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 9 of 10