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May 12, 2021 Lab ID : STK2135727 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Nitrate 300.0 (VI 2143126-00 1) MSD mg/L 40.00 105% 85-119 MSRPD mg/L 10.00 1.3% _<19 300.0 04/28/21:206330MCA CCB mg/L 0.079 0.5 CCV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 103% 90-110 Nitrate + Nitrite as N 300.0 04/28/21:204604MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 04/28/21:204604MCA Blank mg/L ND <0.1 Nitrite 300.0 04/28/21:204604MCA Blank mg/L ND <0.5 LCS mg/L 15.00 101% 90-110 MS mg/L 30.00 101% 74-126 (VI 2143127-00 1) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 0.7% _<20 MS mg/L 30.00 101% 74-126 (VI 2143126-001) MSD mg/L 30.00 102% 74-126 MSRPD m 10.00 1.5% <20 300.0 04/28/21:206330MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 102% 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 101% 90-110 Nitrite Nitrogen 300.0 04/28/21:204604MCA Blank mg/L ND <0.2 Sulfate 300.0 04/28/21:204604MCA Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 101% 82-124 (VI 2143127-001) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 0.8% <23 MS mg/L 100.0 104% 82-124 (VI 2143126-001) MSD mg/L 100.0 105% 82-124 MSRPD mg/L 10.00 1.2% _<23 300.0 04/28/21:206330MCA CCB mg/L 0.202 0.5 CCV mg/L 50.00 106% 90-110 CCB mg/L 0.206 0.5 CCV mg/L 50.00 107% 90-110 MBAs 5540C 04/28/21:206370jba CCB mg/1 -0.0351 0.25 CCV mg/1 1.000 93.2% 90-110 CCB mg/1 -0.0351 0.25 CCV I mg/1 1.000 93.6% 1 90-110 MBAs Extraction 5540C 04/28/21:204727jba Blank mg/L ND <0.1 LCS mg/L 0.5000 93.2% 86-114 BS mg/L 0.5000 93.4% 86-114 BSD mg/L 0.5000 88.8% 86-114 BSRPD DVL 0.5000 5.0% <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. : Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not BS affecting analyte recovery. Page 8 of 9