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April 1, 2022 Lab ID : STK2233763 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC I)ata UQO 'Vote Wet Chem Nitrate 300.0 (SP 2204175-002) MSD mg/L 40.00 98.6% 85-119 MSRPD mg/L 10.00 3.3% <19 300.0 03/18/22:204020njb CCB mg/l 0.00 0.5 CCV mg/1 20.00 104% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 20.00 104% 90-110 Nitrate + Nitrite as N 300.0 03/18/22:203016NJB Blank mg/L ND <0. I Nitrate Nitrogen 300.0 03/18/22:203016NJB Blank m ND <0.1 Nitrite 300.0 03/18/22:203016NJB Blank mg/L ND <0.5 LCS mg/L 15.00 99.1 % 90-110 MS mg/L 30.00 91.2% 74-126 (SP 2204175-001) MSD mg/L 30.00 98.1% 74-126 MSRPD mg/L 10.00 7.3% 1520 MS mg/L 30.00 95.9% 74-126 (SP 2204175-002) MSD mg/L 30.00 99.1% 74-126 MSRPD mg/L, 10.00 3.3% _<20 300.0 03/18/22:204020njb CCB mg/l 0.00 0.5 CCV mg/l 15.00 104% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 15.00 104% 90-110 Nitrite Nitrogen 300.0 03/18/22:203016NJB Blank mg/L ND <0.2 Sulfate 300.0 03/18/22:203016NJB Blank mg/L ND <0.5 LCS mg/L 50.00 98.9% 90-110 MS mg/L 100.0 91.5% 82-124 (SP 2204175-001) MSD mg/L 100.0 98.6% 82-124 MSRPD mg/L 10.00 6.6% _<23 MS mg/L 100.0 94.4% 82-124 (SP 2204175-002) MSD mg/L 100.0 97.6% 82-124 MSRPD mg/L 10.00 3.3% <23 300.0 03/18/22:204020njb CCB mg/l 0.117 0.5 CCV mg/l 50.00 104°�, 90-110 CCB mg/l 0.117 0.5 CCV mg/1 50.00 104% 90-110 BAs 5540C 03/18/22:204185jba CCB mg/l -0.0568 0.25 CCV mg/l 1.000 105% 90-110 CCB mg/l -0.0568 0.25 CCV I mg/l 1.000 104% 1 90-110 BAs Extraction 5540C 03/18/22:203227jba Blank mg/L ND <0.1 LCS mg/L 0.5000 105% 86-114 BS mg/L 0.5000 108% 86-114 BSD mg/L 0.5000 107% 86-114 BSRPD mg/L 0.5000 1.3% <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. : Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample MS matrix affects analyte recovery. : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyte. The recoveries MSD are an indication of how that sample matrix affects analyte recovery. : Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not BS affecting analyte recovery. Page 9 of 10