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October 19, 2021 Lab ID : STK2153763 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 (STK2150625-005) MSD mg/L 40.00 99.4% 85-119 MSRPD m 10.00 6.0% _<19 300.0 09/24/21:215016njb CCB mg/1 0.316 0.5 CCV mg/l 20.00 103% 90-110 CCB mg/1 0.00 0.5 CCV m 20.00 103% 1 90-110 Nitrate+Nitrite as N 300.0 09/24/21:211113NJB Blank m ND <0.1 Nitrate Nitrogen 300.0 09/24/21:211113NJB Blank m ND <0.1 itrite 300.0 09/24/21:211113NJB Blank mg/L ND <0.5 LCS mg/L 15.00 105% 90-110 MS mg/L 30.00 99.8% 74-126 (STK2150625-012) MSD mg/L 30.00 108% 74-126 MSRPD mg/L 10.00 7.7% :520 MS mg/L 30.00 108% 74-126 (STK2150625-005) MSD mg/L 30.00 101% 74-126 MSRPD m 10.00 6.4% :520 300.0 09/24/21:215016njb CCB mg/1 0.00 0.5 CCV mg/1 15.00 106% 90-110 CCB mg/1 0.00 0.5 CCV mg/1 15.00 106% 90-110 Nitrite Nitrogen 300.0 09/24/21:211113NJB Blank m ND <0.2 Sulfate 300.0 09/24/21:211113NJB Blank mg/L ND <0.5 LCS mg/L 50.00 103% 90-110 MS mg/L 100.0 92.9% 82-124 (STK2150625-012) MSD mg/L 100.0 101% 82-124 MSRPD mg/L 10.00 5.6% :523 MS mg/L 100.0 102% 82-124 (STK2150625-005) MSD mg/L 100.0 95.3% 82-124 MSRPD mgfL 10.00 5.1% 523 300.0 09/25/21:215016njb CCB mg/1 0.00 0.5 CCV mg/1 50.00 105% 90-110 CCB mg/l 0.183 0.5 CCV mg/l 50.00 104% 90-110 M13AS 5540C 10/01/21:215360jba CCB mg/l -0.0611 0.25 CCV mg/l 1.000 103% 90-110 CCB mg/l -0.0611 0.25 CCV mg/l 1.000 103% 90-110 BAS Extraction 5540C 09/24/21:211432jba Blank mg/L ND <0.1 LCS mg/L 0.5000 103% 86-114 BS mg/L 0.5000 107% 86-114 BSD mg/L 0.5000 107% 86-114 BSRPD m 0.5000 0.4% <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