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April 14, 2021 Lab ID : STK2134144 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 (STK21341I 1 -00 1) MSD mg/L 40.00 106% 85-119 MSRPD mg/L 10.00 0.3% <19 300.0 03/31/21:204837MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 105% 90-110 Nitrate + Nitrite as N 300.0 03/31/21:203423MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 03/31/21:203423MCA Blank mgfL ND <0.1 Nitrite 300.0 03/31/21:203423MCA Blank mg/L ND <0.5 LCS mg/L 15.00 102% 90-110 MS mg/L 30.00 101% 74-126 (STK2134144-001) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 0.3% <20 MS mg/L 30.00 101% 74-126 (STK2134111-001) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 0.1% <20 300.0 03/31/21:204837MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 103% 90-110 Nitrite Nitrogen 300.0 03/31/21:203423MCA Blank m ND <0.2 Sulfate 300.0 03/31/21:203423MCA Blank mg/L ND <0.5 LCs mg/L 50.00 109% 90-110 MS mg/L 100.0 105% 82-124 (STK2134144-001) MSD mg/L 100.0 106% 82-124 MSRPD mg/L 10.00 0.7% 523 MS mg/L 100.0 108% 82-124 (STK2134111-001) MSD mg/L 100.0 109% 82-124 MSRPD m 10.00 0.4% <23 300.0 03/31/21:204837MCA ICB mgfl- 0.127 0.5 ICV mg/L 50.00 108% 90-110 CCB mg/L 0.132 0.5 CCV mg/L 50.00 110% 90-110 MBAs 5540C 03/31/21:205150jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 93.6% 90-110 CCB mg/L -0.0351 0.25 CCV I m 1.000 93.6% 1 90-110 MBAS Extraction 5540C 03/31/21:203866jba Blank mg/L ND <0.1 LCS mg/L 0.5000 94.1% 86-114 BS mg/L 0.5000 91.3% 86-114 BSD mg/L 0.5000 96.3% 86-114 BSRPD m 0.5000 0.025 <0.1 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