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August 12, 2021 Lab ID : STI(2150124 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 (STIC2150124-00 l ) MSD mg/L 40.00 95.5% 85-119 MSRPD mg/L 10.00 0.4% <19 300.0 07/20/21:211218MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 102% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 103% 90-110 Nitrate + Nitrite as N 300.0 07/20/21:208210MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 07/20/21:208210MCA Blank mg/L ND <0.1 Nitrite 300.0 07/20/21:208210MCA Blank mg/L ND <0.5 LCS mg/L 15.00 100% 90-110 MS mg/L 30.00 102% 74-126 (CH 2175680-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 2.1% <0 MS mg/L 30.00 102% 74-126 (STIC2150124-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 1.0% <0 300.0 07/20/21:211218MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 102% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 104% 90-110 Nitrite Nitrogen 300.0 07/20/21:208210MCA Blank mg/L ND <0.2 Sulfate 300.0 07/20/21:208210MCA Blank mg/L ND <0.5 LCS mg/L 50.00 102% 90-110 MS mg/L 100.0 102% 82-124 (CH 2175680-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 2.0% <3 MS mg/L 100.0 102% 82-124 (STK2 1 50124-001) MSD mg/L 100.0 103% 82-124 MSRPD mg/L 10.00 1.0% <3 300.0 07/20/21:211218MCA ICB mg/L 0.000 0.5 ICV mg/L 50.00 104% 90-110 CCB mg/L 0.171 0.5 CCV mg/L 50.00 105% 90-110 MBAS 5540C 07/20/21:210983jba CCB mg/L -0.0393 0.25 CCV mg/L 1.000 102% 90-110 CCB mg/L -0.0393 0.25 CCV mg/L 1.000 101% 90-110 MBAS Extraction 5540C 07/20/21:208408jba Blank mg/L ND <0.1 LCS mg/L 0.5000 101% 86-114 BS mg/L 0.5000 98.0% 86-114 BSD mg/L 0.5000 105% 86-114 BSRPD mg/L 0.5000 6.5% <5 _ 410 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