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July 6, 2021 Lab ID : STK2138243 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 (STK2138243-001) MSD mg/L 40.00 101% 85-119 MSRPD mg/L 10.00 1.7% 5519 300.0 06/10/21:208849MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 103% 90-110 Nitrate+Nitrite asN 300.0 06/10/21:206493MCA Blank m L ND <0.1 Nitrate Nitrogen 300.0 06/10/21:206493MCA Blank mg/L ND <0.1 itrite 300.0 06/10/21:206493MCA Blank mg/L ND <0.5 LCS ntg/L 15.00 104% 90-110 MS mg/L 30.00 101% 74-126 (STK2138212-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 3.5% :520 MS tng/L 30.00 101% 74-126 (STK2138243-001) MSD mg/L 30.00 104% 74-126 MSRPD m 10.00 2.3% :520 300.0 06/10/21:208849MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV ntg/L 15.00 104% 90-110 Nitrite Nitrogen 300.0 06/10/21:206493MCA Blank m ND <0.2 Sulfate 300.0 06/10/21:206493MCA Blank mg/L ND <0.5 LCS mg/L 50.00 105% 90-110 MS mg/L 100.0 99.7% 82-124 (STK2138212-001) MSD mg/L 100.0 104% 82-124 MSRPD nig/l, 10.00 3.3% :523 MS ntg/L 100.0 98.1% 82-124 (STK2138243-001) MSD tttg/L 100.0 101% 82-124 MSRPD m /I. 10.00 2.0% :523 300.0 06/10/21:208849MCA ICB mg/L 0.000 0.5 ICV mg/L 50.00 103% 90-110 CCB mg/L 0.178 0.5 CCV m 50.00 104% 90-110 BAS 5540C 06/I1/21:208886jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 105% 90-110 CCB mg/L -0.0226 0.25 CCV I m 1.000 106% 1 90-110 MBAs Extraction 5540C 06/11/21:206575jba Blank mg/L ND <0.I LCS mg/L 0.5000 105% 86-114 BS mg/L 0.5000 94.2% 86-114 BSD mg/L 0.5000 93.8% 86-114 BSRPD mg/L 0.5000 0.0021 50.1 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. 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