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October 6, 2021 Lab ID : STK2153514 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 (STK2150625-011) MSD mg/L 40.00 102% 85-119 MSRPD mg/L 10.00 0.09% <19 300.0 09/21/21:214805njb CCB mg/1 0.00 0.5 CCV mg/1 20.00 103% 90-110 CCB mg/I 0.00 0.5 CCV mg/I 20.00 103% 90-110 Nitrate+Nitrite as N 300.0 09/21/21:210931 NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 09/21/21:210931NJB Blank mg/L ND <0.1 Nitrite 300.0 09/21/21:210931NJB Blank mg/L ND <0.5 LCS mg/L 15.00 104% 90-110 MS mg/L 30.00 -0.3% 74-126 435 (STK2150625-006) MSD mg/L 30.00 97.9% 74-126 MSRPD mg/L 10.00 200% <20 435 MS mg/L 30.00 91.2% 74-126 (STK2150625-011) MSD mg/L 30.00 100% 74-126 MSRPD mg/L 10.00 9.3% <20 300.0 09/21/21:214805njb CCB mg/I 0.00 0.5 CCV mg/I 15.00 107% 90-110 CCB mg/I 0.00 0.5 CCV mg/I 15.00 105% 90-110 Nitrite Nitrogen 300.0 09/21/21:21093 1 NJB Blank mg/L ND <0.2 Sulfate 300.0 09/21/21:210931NJB Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 101% 82-124 (STK2150625-006) MSD mg/L 100.0 101% 82-124 MSRPD mg/L 10.00 0.2% <23 MS mg/L 100.0 99.0% 82-124 (STK2150625-011) MSD mg/L 100.0 99.3% 82-124 MSRPD mg/L 10.00 0.2% <23 300.0 09/21/21:214805njb CCB mg/1 0.139 0.5 CCV mg/I 50.00 106% 90-110 CCB mg/I 0.00 0.5 CCV mg/I 50.00 106% 90-110 MBAs 5540C 09/21/21:214866jba CCB mg/1 -0.0436 0.25 CCV mg/1 1.000 102% 90-110 CCB mg/l -0.0480 0.25 CCV mg/I 1.000 103% 1 90-110 MBA S Extraction 5540C 09/21/21:211052jba Blank mg/L ND <0.1 LCS mg/L 0.5000 102% 86-114 BS mg/L 0.5000 100% 86-114 BSD mg/L 0.5000 107% 86-114 BSRPD m L 0.5000 6.4% <5 410 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