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October 19, 2021 Lab ID : STK2154075 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 (STK2154075-001) MSD mg/L 40.00 107% 85-119 MSRPD mg/L 10.00 6.2% <19 300.0 10/02/21:215448njb CCB mg/1 0.00 0.5 CCV mg/1 20.00 104% 90-110 CCB mg/I 0.00 0.5 CCV m I 20.00 104% 90-110 Nitrate+Nitrite as N 300.0 10/01/21:211396NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 10/01/21:211396NJB Blank mg/L ND <0.1 Nitrite 300.0 10/01/21:211396NJB Blank mg/L ND <0.5 LCs mg/L 15.00 107% 90-110 MS mg/L 30.00 103% 74-126 (STK2154077-001) MSD mg/L 30.00 112% 74-126 MSRPD mg/L 10.00 8.0% <20 MS mg/L 30.00 104% 74-126 (STK2154075-001) MSD mg/L 30.00 111% 74-126 MSRPD mg/L 10.00 6.7% <20 300.0 10/02/21:215448njb CCB mg/1 0.00 0.5 CCV mg/l 15.00 107% 90-110 CCB mg/1 0.00 0.5 CCV mg/1 15.00 108% 90-110 Nitrite Nitrogen 300.0 10/01/21:211396NJB Blank m ND <0.2 Sulfate 300.0 10/01/21:211396NJB Blank mg/L ND <0.5 LCs mg/L 50.00 107% 90-110 MS mg/L 100.0 102% 82-124 (STK2154077-001) MSD mg/L 100.0 110% 82-124 MSRPD mg/L 10.00 8.1% <23 MS mg/L 100.0 102% 82-124 (STK2154075-001) MSD mg/L 100.0 109% 82-124 MSRPD m 10.00 6.5% <23 300.0 10/02/21:215448njb CCB mg/1 0.139 0.5 CCV mg/1 50.00 108% 90-110 CCB mg/1 0.00 0.5 CCV m /l 50.00 108% 90-110 MBAs 5540C 10/01/21:215464jba CCB mg/1 -0.0611 0.25 CCV mg/1 1.000 104% 90-110 CCB mg/1 -0.0611 0.25 CCV mg/1 1.000 104% 1 90-110 MBAS Extraction 5540C 10/01/21:211493jba Blank mg/L ND <0.1 LCs mg/L 0.5000 104% 86-114 BS mg/L 0.5000 95.0% 86-114 BSD mg/L 0.5000 99.3% 86-114 BSRPD m L 0.5000 4.5% <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