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March 16, 2022 Lab ID : STK2233086 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. Qt' Data I)QO Note Wet Chem Nitrate 300.0 (SP 2203322-007) MSD mg/L 40.00 ua ' 85-119 MSRPI) mg/L 10.00 7.8`4 <19 300.0 03/04/22:203332njb CCB mg/I 0.00 0.5 CCV mg/l 20.00 102% 90-110 CCB mg/1 0.00 0.5 CCV mg/I 20.00 102% 90-110 Nitrate + Nitrite as N 300.0 03/04/22:202494NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 03/04/22:202494NJB Blank mg/L 111 t <0.I itrite 300.0 03/04/22:202494NJB Blank mg/L ND <0.5 LCS mg/L 15.00 99.8% 90-110 MS mg/L 30.00 95.0% 74-126 (SP 2203322-006) MSD mg/L 30.00 103% 74-126 MSRPI) mg/L 10.00 7.6% <20 MS mg/L 30.00 94.0% 74-126 (SP 2203322-007) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 8.2%r <20 03/04/22:203332Rib CCB mg/l 0.00 0.5 CCV mg/1 15.00 103'; 90-110 CCB mg/1 0.00 0.5 CCV mg/l 15.00 102% 90-110 Nitrite Nitrogen 300.0 03/04/22:202494NJB Blank mg/L ND <0.2 Sulfate 300.0 03/04/22:202494NJB Blank mg/L ND <0.5 LCS mg/L 50.00 99.7% 90-110 MS mg/L 100.0 94.5% 82-124 (SP 2203322-006) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 7.4% <_23 MS mg/L 100.0 93.8% 82-124 (SP 2203322-007) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 8.1% <_23 300.0 03/04/22:203332njb CCB mg/1 0.169 0.5 CCV mg/I 50.00 102% 90-110 CCB mg/I 0.179 0.5 CCV mg/I 50.00 102% 90-110 MBAs 03/04/22:203440jba CCB mg/I -0.0611 0.25 CCV mg/I 1.000 103% 90-110 CCB mg/I -0.0611 0.25 CCV mg/l 1.000 104% 90-110 BAS Extraction ;; K 03/04/22:202645jba Blank mg/L ND <0.1 LCS mg/L 0.5000 103% 86-114 BS mg/L 0.5000 114% 86-114 BSD mg/L 0.5000 112% 86-114 BSRPD mg/L 0.5000 1.2%n <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. 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. 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