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January 3, 2022 Lab ID : STK2158017 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 (STK2157466-001) MSD mg/L 40.00 103% 85-119 MSRPD mg/L 10.00 7.4% <19 300.0 12/17/21:219611njb ICB mg/l 0.00 0.5 ICV mg/l 20.00 96.6% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 20.00 99.5% 90-110 Nitrate+Nitrite as N 300.0 12/17/21:214556NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 12/17/21:214556NJB Blank mg/L ND <0.1 Nitrite 300.0 12/17/21:214556NJB Blank mg/L ND <0.5 LCS mg/L 15.00 100% 90-110 MS mg/L 30.00 97.6% 74-126 (VI 214942 1-00 1) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 5.5% <20 MS mg/L 30.00 93.5% 74-126 (STK2157466-001) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 7.6% <20 300.0 12/17/21:219611njb ICB mg/1 0.00 0.5 ICV mg/l 15.00 98.6% 90-110 CCB mg/l 0.00 0.5 CCV mg/1 15.00 99.4% 90-110 Nitrite Nitrogen 300.0 12/17/21:214556NIB Blank mg/L ND <0.2 Sulfate 300.0 12/17/21:214556NJB Blank mg/L ND <0.5 LCS mg/L 50.00 101 % 90-110 MS mg/L 100.0 94.7% 82-124 (VI 214942 1-00 1) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 4.5% <23 MS mg/L 100.0 93.8% 82-124 (STK2157466-001) MSD mg/L 100.0 101 % 82-124 MSRPD mg/L 10.00 6.6% <23 300.0 12/17/21:219611njb ICB mg/1 0.00 0.5 ICV mg/l 50.00 100% 90-110 CCB mg/l 0.127 0.5 CCV mg/1 50.00 101% 90-110 MBAs 5540C 12/18/21:219861AMM CCB mg/1 -0.0568 0.25 CCV mg/l 1.000 98.0% 90-110 CCB mg/1 -0.0568 0.25 CCV m /l 1 1.000 99.8% 1 90-110 MBA S Extraction 5540C 12/18/21:214848AMM Blank mg/L ND <0.1 LCS mg/L 0.5000 99.8% 86-114 BS mg/L 0.5000 96.7% 86-114 BSD mg/L 0.5000 95.4% 86-114 BSRPD mg/L 0.5000 1.4% <5 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