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March 24, 2022 Lab ID : STK2233209 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 (VI 224 147 1-00 1) MSD mg/L 40.00 98.8% 85-119 MSRPD mg/L 10.00 8.8% <_19 300.0 03/08/22:203519njb CCB mg/l 0.00 0.5 CCV mg/I 20.00 104% 90-110 CCB mg/1 0.00 0.5 CCV mg/I 20.00 104% 90-110 Nitrate+Nitrite as N 300.0 03/08/22:20259INJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 03/08/22:20259INJB Blank m ND <0.1 Nitrite 300.0 03/08/22:20259INJB Blank mg/L ND <0.5 LCS mg/L 15.00 100% 90-110 MS mg/L 30.00 96.3% 74-126 (VI 2241455-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 6.7% <_20 MS mg/L 30.00 92.4% 74-126 (V12241471-001) MSD mg/L 30.00 107% 74-126 MSRPD mg/L 10.00 14.4% <20 300.0 03/08/22:203519njb CCB mg/1 0.00 0.5 CCV mg/1 15.00 104% 90-110 CCB mg/I 0.00 0.5 CCV mg/1 15.00 103% 90-110 Nitrite Nitrogen 300.0 03/08/22:20259INJB Blank mg/L ND <0.2 Sulfate 300.0 03/08/22:202591NJB Blank mg/L ND <0.5 LCS mg/L 50.00 99.5% 90-110 MS mg/L 100.0 91.7% 82-124 (VI 2241455-001) MSD mg/L. 100.0 97.9% 82-124 MSRPD mg/L 10.00 5.0% <23 MS mg/L 100.0 90.5% 82-124 (VI 2241471-001) MSD mg/L 100.0 104% 82-124 MSRPD I m 10.00 13.7% <23 300.0 03/08/22:203519njb CCB mg/1 0.172 0.5 CCV mg/I 50.00 103% 90-110 CCB mg/1 0.172 0.5 CCV mg/1 50.00 103% 90-110 MBAs 5540C 03/09/22:203688jba CCB mg/L -0.0611 0.25 CCV mg/L 1.000 96.7% 90-110 CCB mg/L -0.0611 0.25 CCV mg/L 1.000 95.9% 90-110 MBAS Extraction 5540C 03/09/22:202818jba Blank mg/L ND <0.1 LCS mg/L. 0.5000 96.3% 86-114 BS mg/L 0.5000 99.8% 86-114 BSD mg/L 0.5000 100% 86-114 BSRPD mg/L 0.5000 1 0.0022 1 :50.1 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