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July 14, 2021 Lab ID : STK2138805 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 (STK2138688-002) MSD nig/L 40.00 95.8% 85-119 MSRPD m 50.00 2.4% 519 300.0 06/22/21:209560MCA CCB mg/L 0.000 0.5 CCV nig/L 20.00 94.4% 90-110 CCB mg/L 0.000 0.5 CCV nt L 20.00 94.7% 90-110 itrate+Nitrite as N 300.0 06/22/21:206981MCA Blank I nig/L ND <0.1 Nitrate Nitrogen 300.0 06/22/21:206981MCA Blank I mg/L ND <0.I itrite 300.0 06/22/21:20698 1 MCA Blank mg/L ND <0.5 LCS mg/L 15.00 96.6% 90-110 MS mg/L 30.00 95.1% 74-126 (CH 2174387-001) MSD mg/L 30.00 98.6% 74-126 MSRPD mg/L 50.00 3.6% :520 MS mg/L 30.00 92.9% 74-126 (STK2138688-002) MSD mg/L 30.00 95.6% 74-126 MSRPD m 50.00 2.9% 5520 300.0 06/22/21:209560MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 97.4% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 97.2% 90-110 Nitrite Nitrogen 300.0 06/22/21:206981MCA Blank mg/L ND <0.2 Sulfate 300.0 06/22/21:20698 1 MCA Blank mg/L ND <0.5 LCS mg/L 50.00 99.1% 90-110 MS mg/L 100.0 98.4% 82-124 (CH 2174387-001) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 50.00 3.6% 5523 MS mg/L 100.0 96.3% 82-124 (STK2138688-002) MSD mg/L 100.0 99.0% 82-124 MSRPD mg/L 50.00 2.5% :523 300.0 06/22/21:209560MCA CCB mg/L 0.139 0.5 CCV mg/L 50.00 101% 90-110 CCB mg/L 0.116 0.5 CCV mg/L 50.00 100% 90-110 MBAs 5540C 06/23/21:209682jba CCB mg/L -0.0351 0.25 CCV nig/L 1.000 105% 90-110 CCB mg/L. -0.0226 0.25 CCV I m 1.000 105% 1 90-110 MBAs Extraction ��40C' 06/23/21:207152jba Blank mg/L ND <0.1 LCS Ing/l, 0.5000 104% 86-114 BS nig/L 0.5000 95.5% 86-114 BSD mg/L 0.5000 104% 86-114 BSRPD mg/L 0.5000 8.7% <_5 410 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. 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