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March 16, 2022 Lab ID : STK2232361 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 (CH 2270822-001) MSD mg/L 40.00 100% 85-119 MSRPD mg/L 10.00 4.7% <19 300.0 02/16/22:202434njb CCB mg/1 0.00 0.5 CCV m9/1 20.00 100% 90-110 CCB mg/1 0.00 0.5 CCV mg/1 20.00 101% 90-110 Nitrate + Nitrite as N 300.0 02/16/22:201798NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 02/16/22:201798NJB Blank mg/L ND <0.1 itrite 300.0 02/16/22:201798NJB Blank mg/L ND <0.5 LCS mg/L 15.00 99.6% 90-110 MS mg/L 30.00 93.7% 74-126 (STK2231760-001) MSD mg/L 30.00 105% 74-126 MSRPD mg/L 10.00 11.6% :520 MS mg/L 30.00 97.8% 74-126 (CH 2270822-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 4.8% 1 :�20 300.0 02/16/22:202434njb CCB mg/l 0.00 0.5 CCV mg/l 15.00 102% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 15.00 102% 90-110 Nitrite Nitrogen 300.0 02/16/22:201798NJB Blank mg/L ND <0.2 Sulfate 300.0 02/16/22:201798NJB Blank mg/L ND <0.5 LCS mg/L 50.00 107% 90-110 MS mg/L 100.0 98.7% 82-124 (STK2231760-001) MSD mg/L 100.0 110% 82-124 MSRPD mg/L 10.00 10.8% <23 MS mg/L 100.0 102% 82-124 (CH 2270822-001) MSD mg/L 100.0 107% 82-124 MSRPD m 10.00 4.6% <23 300.0 02/16/22:202434njb CCB mg/1 0.141 0.5 CCV mg/1 50.00 109% 90-110 CCB mg/1 0.00 0.5 CCV m 50.00 109% 90-110 BAS 5540C 02/16/22:202595jba CCB mg/1 -0.0568 0.25 CCV mg/1 1.000 95.0% 90-110 CCB mg/1 -0.0568 0.25 CCV mg/1 1.000 95.4% 90-110 BAS Extraction 5540C 02/16/22:201970jba Blank mg/L ND <0.1 LCS mg/L 0.5000 95.0% 86-114 BS mg/L 0.5000 93.7% 86-114 BSD mg/L 0.5000 97.6% 86-114 BSRPD mg/L 0.5000 4.1% <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