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March 16, 2022 Lab ID : STK2232244 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/ID T) pe units Cone. QU Data I)QO Note Wet Chem Nitrate 300.0 (VI 2240793-002) MSD mg/L 40.00 98.4% 85-119 MSRPD mg/L 10.00 3.7% <_19 300.0 02/15/22:202368njb CCB mg/I 0.00 0.5 CCV mg/l 20.00 101% 90-110 CCB mg/1 0.00 0.5 CCV mg/1 20.00 1011': 90-110 Nitrate + Nitrite as N 300.0 02/15/22:20176ONJB Blank m /L ND <0.1 Nitrate Nitrogen 300.0 02/15/22:20176ONJB Blank mg/L ND <0.1 Nitrite 300.0 02/15/22:20176ONJB Blank mg/L ND <0.5 LCS mg/L 15.00 99.4% 90-110 MS mg/L 30.00 96.9% 74-126 (VI 2240793-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 4.5% <_20 MS mg/L 30.00 97.2% 74-126 (VI 2240793-002) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 5.0% <20 300.0 02/15/22:202368njb CCB mg/1 0.00 0.5 CCV mg/1 15.00 103% 90-110 CCB mg/1 0.00 0.5 CCV mg/I 15.00 102% 90-110 Nitrite Nitrogen 300.0 02/15/22:20176ONJB Blank mg/L ND <0.2 ulfate 300.0 02115/22:20176ONJB Blank mg/L ND <0.5 LCS mg/L 50.00 107% 90-110 MS mg/L 100.0 95.2% 82-124 (VI 2240793-001) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 3.2% <_23 MS mg/L 100.0 95.8% 82-124 (VI 2240793-002) MSD mg/L 100.0 101% 82-124 MSRPD mg/L 10.00 3.5% <23 300.0 02/15/22:202368njb CCB mg/I 0.180 0.5 CCV mg/I 50.00 109% 90-110 CCB mg/1 0.144 0.5 CCV m /l 50.00 110% 90-110 pH 4500-H B (SP 2201986-002) Dup units 0% 4.80 4500HB 02/18/22:202528jba CCV units 8.000 102% 95-105 CCV units 8.000 1 102%x, 95-105 MBAS 5540C 02/16/22:202595jba CCB mg/I -0.0524 0.25 CCV mg/I 1.000 95.0% 90-110 CCB ntg/l -0.0568 0.25 CCV mg/I 1.000 95.0% 90-110 MBAs Extraction 5540C 02/16/22:201970jba Blank mg/L ND <0.1 LCS mg/L 0.5000 95.0% 86-114 BS mg/L 0.5000 93.7% 86-114 BSD mg/L 0.5000 97.6% 86-114 BSRPD I mg/L 0.5000 4.1% 1 <5 Definition ICI : 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 sam le matrix affects analyte recovery. Page 8 of 9