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June 9, 2021 Lab ID : STK2137320 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 (VI 2143484-002) MSD mg/L 40.00 88.0% 85-119 MSRPD mg/L 10.00 1.0% <19 300.0 05/25/21:207838MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 101% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 102 % 90-110 Nitrate + Nitrite as N 300.0 05/25/21:205821MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 05/25/21:205821MCA Blank mg/L ND <0.1 Nitrite 300.0 05/25/21:205821MCA Blank mg/L ND <0.5 LCS mg/L 15.00 101% 90-110 MS mg/L 30.00 104% 74-126 (CH 2173257-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 0.3% <0 MS mg/L 30.00 103 % 74-126 (VI 2143484-002) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 2.1% <0 300.0 05/25/21:207838MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 101% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 102% 90-110 Nitrite Nitrogen 300.0 05/25/21:205821MCA Blank mg/L ND <0.2 Sulfate 300.0 05/25/21:205821MCA Blank mg/L ND <0.5 LCS mg/L 50.00 101% 90-110 MS mg/L 100.0 93.3 % 82-124 (CH 2173257-001) MSD mg/L 100.0 93.9% 82-124 MSRPD mg/L 10.00 0.4% <3 MS mg/L 100.0 98.2 % 82-124 (V12143484-002) MSD mg/L 100.0 96.6% 82-124 MSRPD mgL 10.00 1.2% <3 300.0 05/25/21:207838MCA ICB mg/L 0.171 0.5 ICV mg/L 50.00 101% 90-110 CCB mg/L 0.171 0.5 CCV mg/L 50.00 102% 90-110 MBAS 5540C 05/26/21 :208187jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 94.5 % 90-110 CCB mg/L -0.0226 0.25 CCV mg/L 1.000 94.9% 90-110 MBAS Extraction 5540C 05/25/21:206063jba Blank mg/L ND <0.1 LCS mg/L 0.5000 94.5 % 86-114 BS mg/L 0.5000 95.1% 86-114 BSD mg/L 0.5000 93.8 % 86-114 BSRPD mg/L 0.5000 0.0063 <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