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December 30, 2021 Lab ID : STK2157973 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Nitrate 300.0 (SP 2117787-003) MSD mg/L 40.00 101 % 85-119 MSRPD mg/L 10.00 8.5% <19 300.0 12/16/21:219610njb CCB mg/1 0.00 0.5 CCV mg/l 20.00 99.0% 90-110 CCB mg/l 0.00 0.5 CCV m /I 20.00 98.9% 90-110 Nitrate+Nitrite as N 300.0 12/16/21:214499NJB Blank I mg/L ND <0.1 Nitrate Nitrogen 300.0 12/16/21:214499NJB Blank mg/L ND <0.1 Nitrite 300.0 12/16/21:214499NJB Blank mg/L ND <0.5 LES mg/L 15.00 99.9% 90-110 MS mg/L 30.00 90.4% 74-126 (SP 2117922-00 1) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 11.0% _<20 MS mg/L 30.00 92.1 % 74-126 (SP 2117787-003) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 9.9% <20 300.0 12/I6/21:219610njb CCB mg/l 0.00 0.5 CCV mg/l 15.00 99.4% 90-110 CCB mg/1 0.00 0.5 CCV mg/1 15.00 99.0% 90-110 Nitrite Nitrogen 300.0 12/16/21:214499NJB Blank mg/L ND <0.2 Sulfate 300.0 12/16/21:214499NJB Blank mg/L ND <0.5 LCS mg/L 50.00 101 % 90-110 MS mg/L 100.0 87.6% 82-124 (SP 2117922-00 1) MSD mg/L 100.0 97.9% 82-124 MSRPD mg/L 10.00 8.8% <23 MS mg/L 100.0 89.1 % 82-124 (SP 2117787-003) MSD mg/L 100.0 98.7% 82-124 MSRPD mg/L 10.00 8.8% <23 300.0 12/16/21:219610njb CCB mg/l 0.133 0.5 CCV mg/l 50.00 101% 90-110 CCB mg/l 0.144 0.5 CCV mg/1 50.00 101% 90-110 MBAs 5540C 12/17/21:219886JBA CCB mg/l -0.0611 0.25 CCV mg/1 1.000 104% 90-110 CCB mg/I -0.0611 0.25 CCV m I 1.000 103% 1 90-110 MBAS Extraction 5540C 12/17/21:214865JBA Blank mg/L ND <0.1 LCS mg/L 0.5000 103% 86-114 BS mg/L 0.5000 101% 86-114 BSD mg/L 0.5000 99.8% 86-114 BSRPD m L 0.5000 1.3% <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