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January 28, 2022 Lab ID : STK223O465 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 (VI 2240060-001) MSD mg/L 40.00 100% 85-119 MSRPD m 10.00 2.9% :519 300.0 0 1/1 1/22:200598njb CCB mg/l 0.00 0.5 CCV mg/l 20.00 103% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 20.00 102% 90-110 Nitrate+Nitrite asN 300.0 01/11/22:200350NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 01/11/22:200350NJB Blank mg/L ND <0.1 Nitrite 300.0 01/11/22:200350NJB Blank mg/L ND <0.5 LCS mg/L 15.00 100% 90-110 MS mg/L 30.00 93.6% 74-126 (STK2230261-001) MSD mg/L 30.00 t07% 74-126 MSRPD mg/L 10.00 13.6% :520 MS mg/L 30.00 97.3% 74-126 (VI 2240060-001) MSD ntg/L 30.00 101% 74-126 MSRPD to 10.00 3.9% 5_20 300.0 01/11/22:200598njb CCB mg/I 0.0520 0.5 CCV mg/l 15.00 103% 90-110 CCB mg/1 0.0520 0.5 CCV mg/l 15.00 101% 90-110 Nitrite Nitrogen 300.0 01/11/22:200350NJB Blank mg/L ND <0.2 Sulfate 300.0 01/11/22:200350NJB Blank mg/L ND <0.5 LCS mg/L 50.00 107% 90-110 MS mg/L 100.0 94.9% 82-124 (STK223026 1-00 1) MSD mg/L 100.0 109% 82-124 MSRPD mg/L 10.00 12.6% 5523 MS mg/L 100.0 97.2% 82-124 (VI 2240060-001) MSD mg/L 100.0 101% 82-124 MSRPD m 10.00 3.4% :523 300.0 01/11/22:200598njb CCB mg/l 0.147 0.5 CCV mg/l 50.00 110% 90-110 CCB mg/l 0.145 0.5 CCV mg/1 50.00 109% 90-110 BAS 5540C 01/11/22:200918amm CCB mg/1 -0.0568 0.25 CCV mg/l 1.000 102% 90-110 CCB mg/l -0.0611 0.25 CCV I mg/l 1.000 104% 1 90-110 BAS Extraction 5540C 01/11/22:20070ljba Blank mg/L ND <0.1 LCS mg/L 0.5000 104% 86-114 BS mg/L 0.5000 108% 86-114 BSD mg/L 0.5000 108% 86-114 BSRPD mg/L 0.5000 0.4% :55 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