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March 2, 2021 Lab ID : STK2131533 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control-Inorganic Constituent Method Date/ID Type Units Cone. QC Data UQO Note Wet Chem Nitrate 300.0 (STK2131533-001) MSD mg/L 40.00 102% 85-119 MSRPD mg/L 10.00 0.8% <19 300.0 02/04/21:201701MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 104% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 104% 90-110 Nitrate+Nitrite as N 300.0 02/04/21:201242MCA Blank nig/L ND <0.1 Nitrate Nitrogen 300.0 02/04/21:201242MCA Blank mg/L ND <0.1 Nitrite 300.0 02/04/21:201242MCA Blank nig/L ND <0.5 LCS mg/L 15.00 101% 90-110 MS iiig/L 30.00 99.6% 74-126 (VI 2140878-001) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 1.3% :520 MS mg/L 30.00 102% 74-126 (STK2131533-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.0% 1 :520 300.0 02/04/21:201701MCA ICB nig/L 0.000 0.5 ICV mg/L 15.00 100% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 103% 90-110 Nitrite Nitrogen 300.0 02/04/21:201242MCA Blank mg/L ND <0.2 Sulfate 300.0 02/04/21:201242MCA Blank mg/L ND <0.5 LCS mg/L 50.00 98.1% 90-110 MS nig/L 100.0 92.6% 82-124 (VI 2140878-001) MSD ing/L 100.0 94.2% 82-124 MSRPD mg/L 10.00 1.2% :523 MS mg/L 100.0 96.6% 82-124 (STK2131533-001) MSD mg/L 100.0 98.3% 82-124 MSRPD mg/L 10.00 1.6% <23 300.0 02/04/21:201701MCA ICB mg/L 0.000 0.5 ICV nig/L 50.00 96.9% 90-110 CCB mg/L 0.203 0.5 CCV nig/L 50.00 99.8% 90-110 MBAs 5540C 02/05/21:201989jba CCB nig/L 0.000 0.1 CCV m L 10.00 100% 99-101 MBAS Screen 5540C MS 1119/1- 10.00 100% 90-110 (STK2131533-001) MSD nig/L 10.00 100% 90-110 MSRPD I mg/L 10.00 0.0 1 <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. Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. Page 8 of 9