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March 2, 2021 Lab ID : STK2131947 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 (CH 2170944-005) MSD mg/L 40.00 100% 85-119 MSRPD m 10.00 0.6% <19 300.0 02109/21:202017MCA CCB mg/L 0.000 0.5 CCV mg/L 20.00 97.8% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 97.6% 90-1 l0 Nitrate + Nitrite as N 300.0 02/09/21:201408MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 02/09/21:201408MCA Blank mg/L ND <0.1 Nitrite 300.0 02/09/21:201408MCA Blank mg/L ND <0.5 LCS mg/L 15.00 101% 90-110 MS mg/L 30.00 101% 74-126 (CH 2170944-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.7% 520 MS mg/L 30.00 102% 74-126 (CH 2170944-005) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 1.4% :520 300.0 02/09/21:202017MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 101% 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 103% 90-110 Nitrite Nitrogen 300.0 02/09/21:201408MCA Blank mg/L ND <0.2 Sulfate 300.0 02/09/21:201408MCA Blank mg/L ND <0.5 LCS mg/L 50.00 104% 90-110 MS mg/L 100.0 96.8% 82-124 (CH 2170944-001) MSD mg/L 100.0 98.4% 82-124 MSRPD mg/L 10.00 1.3% <23 MS mg/L 100.0 98.4% 82-124 (CH 2170944-005) MSD mg/L 100.0 99.3% 82-124 MSRPD mg/L 10.00 0.8% :523 300.0 02/09/21:202017MCA CCB mg/L 0.132 0.5 CCV mg/L 50.00 101% 90-110 CCB mg/L 0.133 0.5 CCV mg/L 50.00 101% 90-110 MBAS 5540C 02/10/21:202358jba CCB mg/L -0.0400 0.25 CCV mg/L 1.000 102% 90-110 CCB mg/L -0.0400 0.25 CCV m 1.000 102% 1 90-110 MBAS Extraction 5540C 02/10/21:201755jba Blank mg/L ND <0.1 LCS mg/L 0.5000 101% 86-114 BS mg/L 0.5000 91.8% 86-114 BSD mg/L 0.5000 89.4% 86-114 BSRPD mg/L 0.5000 0.012 <_O.I 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. 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. : 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