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August 25, 2021 Lab ID : STK2150883 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 (STK2150869-001) MSD mg/L 40.00 95.0% 85-119 MSRPD mg/L 10.00 0.2% <19 300.0 08/03/21:212025MCA CCB mg/L 0.000 0.5 CCV mg/L. 20.00 102% 90-110 CCB mg/L 0.085 0.5 CCV m 20.00 103% 90-110 Nitrate+Nitrite as N 300.0 08/03/21:208810MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 08/03/21:208810MCA Blank mg/L ND <0.1 Nitrite 300.0 08/03/21:208810MCA Blank mg/L ND <0.5 LCS mg/L 15.00 95.7% 90-110 MS mg/L 30.00 97.7% 74-126 (STK2150888-001) MSD mg/L 30.00 99.6% 74-126 MSRPD mg/L 10.00 1.9% 520 MS mg/L 30.00 99.5% 74-126 (STK2150869-001) MSD mg/L 30.00 100% 74-126 MSRPD mg/L 10.00 0.8% <20 300.0 08/03/21:212025MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 99.8% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 99.5% 90-110 Nitrite Nitrogen 300.0 08/03/21:208810MCA Blank m ND <0.2 Sulfate 300.0 08/03/21:208810MCA Blank mg/L ND <0.5 LCS mg/L 50.00 102% 90-110 MS mg/L 100.0 102% 82-124 (STK2150888-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 1.7% 523 MS mg/L 100.0 101% 82-124 (STK2150869-001) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 0.8% <23 300.0 08/03/21:212025MCA CCB mg/L. 0.180 0.5 CCV mg/L 50.00 106% 90-110 CCB mg/L 0.155 0.5 CCV mg/L 50.00 106% 90-110 MBAs 5540C 08/04/21:211422JBA CCB mg/L. -0.0393 0.25 CCV mg/L 1.000 96.6% 90-110 CCB mg/L -0.0185 0.25 CCV I mgfL 1.000 97.8% 1 90-110 MBAs Extraction 5540C 08/03/21:209066JBA Blank mg/L ND <0.1 LCS mg/L 0.5000 96.6% 86-114 BS mg/L 0.5000 95.5% 86-114 BSD mg/L 0.5000 96.7% 86-114 BSRPD mg/L 0.5000 0.0063 <0.1 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