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March 23, 2021 Lab ID : STK2133009 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control - Inorganic Constituent 3lethod Date/ID Type Units Conc. QC Data l)QO Note Wet Chem Nitrate 300.0 (VI 2141617-00 1) MSD mg/L 40.00 34.4% 85-119 435 MSRPD mg/L 10.00 15.6% <_19 300.0 03/04/21:203298MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 103% 90-110 CCB mg/L 0.078 0.5 CCV m 20.00 104% 90-110 Nitrate+Nitrite as N 300.0 03/04/21:202410MCA Blank in L ND <0.1 Nitrate Nitrogen 300.0 03/04/21:202410MCA Blank mg1L ND <0.1 Nitrite 300.0 03/04/21:202410MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 104% 74-126 (CH 2171418-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 2.3% 520 MS mg/L 30.00 103% 74-126 (VI 2141617-001) MSD mg/L 30.00 103% 74-126 MSRPD m 10.00 0.05% 520 300.0 03/04/21:203298MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 104% 90-110 Nitrite Nitrogen 300.0 03/04/21:202410MCA Blank mg/L ND <0.2 Sulfate 300.0 03/04/21:202410MCA Blank mg/L ND <0.5 LCS mg/L 50.00 104% 90-110 MS mg/L 100.0 104% 82-124 (CH 2171418-001) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 1.6% 523 MS mg/L 100.0 94.6% 82-124 (VI 2141617-001) MSD mg/L 100.0 95.1% 82-124 MSRPD mg/L 10.00 0.3% :523 300.0 03/04/21:203298MCA CCB mg/L 0.408 0.5 CCV mg/L 50.00 106% 90-110 CCB mg/L 0.313 0.5 CCV mg/L 50.00 105% 90-110 MBAs 5540C 03/04/21:203395jba CCB mg/L -0.0393 0.25 CCV mg/L 1.000 94.1% 90-110 CCB mg/L -0.0393 0.25 CCV I mg/L 1.000 93.6% 1 90-110 MB AS Extraction 5540C 03/04/21:202526jba Blank mg/L ND <0.1 LCS mg/L 0.5000 93.6% 86-114 BS mg/L 0.5000 90.5% 86-114 BSD mg/L 0.5000 91.3% 86-114 BSRPD pkL 0.5000 0.0042 50.1 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