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October 6, 2021 Lab ID : STK2153511 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 (STK2150625-015) MSD mg/L 40.00 102% 85-119 MSRPD mg/L 10.00 0.1% <19 300.0 09/21/21:214807njb CCB mg/I 0.00 0.5 CCV mg/I 20.00 103% 90-110 CCB mg/I 0.00 0.5 CCV mg/I 20.00 103% 1 90-110 Nitrate + Nitrite as N 300.0 09/21/21:21093ONJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 09/21/21:21093ONJB Blank mg/L ND <0.1 Nitrite 300.0 09/21/21:21093ONJB Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 102% 74-126 (CH 2177537-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 0.1% <20 MS mg/L 30.00 103% 74-126 (STK2150625-015) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 0.5% <20 300.0 09/21/21:214807njb CCB mg/I 0.00 0.5 CCV mg/I 15.00 105% 90-110 CCB mg/1 0.00 0.5 CCV mg1I 15.00 104% 90-110 Nitrite Nitrogen 300.0 09/21/21:21093ONJB Blank mg/L ND <0.2 Sulfate 300.0 09/21/21:21093ONJB Blank mg/L ND <0.5 LCS mg/L 50.00 102% 90-110 MS mg/L 100.0 96.3% 82-124 (CH 2177537-001) MSD mg/L 100.0 96.6% 82-124 MSRPD mg/L 10.00 0.2% <23 MS mg/L 100.0 99.6% 82-124 (STK2150625-015) MSD mg/L 100.0 99.9% 82-124 MSRPD mg/L 10.00 0.2% <23 300.0 09/21/21:214807njb CCB mg/l 0.00 0.5 CCV mg/l 50.00 103% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 50.00 103% 90-110 BAS 5540C 09/21/21:214866jba CCB mg/l -0.0436 0.25 CCV mg/l 1.000 102% 90-110 CCB mg/l -0.0480 0.25 CCV mg/l 1.000 103% 1 90-110 BAS Extraction 5540C 09/21/21:211052jba Blank mg/L ND <0.I LCS mg/L 0.5000 102% 86-114 BS mg/L 0.5000 100% 86-114 BSD mg/L 0.5000 107% 86-114 BSRPD m L 0.5000 6.4% <5 410 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 8of9