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March 23, 2021 Lab ID : STK2133085 San Joaquin Co.Environmental Health Dep Customer : 3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units (,unt. Q('Data l)QO Note Wet Chem Nitrate 300.0 (STK2133085-001) MSD mg/L 40.00 93.0% 85-119 MSRPD -91L 10.00 0.8% <19 300.0 03/05/21:203335MCA CCB 1119/1- 0.078 0.5 CCV mg/L 20.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 20.00 104% 90-110 Nitrate+Nitrite as N 300.0 03/05/21:202411 MCA Blank m ND <0.1 Nitrate Nitrogen 300.0 03/05/21:202411 MCA Blank m ND <0.1 Nitrite 300.0 03/05/21:202411 MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 103% 74-126 (STK2133080-001) MSD m9/1- 30.00 104% 74-126 MSRPD mg/L 10.00 0.5% <20 MS mg/L 30.00 102% 74-126 (STK2133085-001) MSD 1119/1- 30.00 104% 74-126 MSRPD m 10.00 1.5% <20 300.0 03/05/21:203335MCA CCB mg/L 0.062 0.5 CCV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 104% 90-110 Nitrite Nitrogen 300.0 03/05/21:202411 MCA Blank mg/L ND <0.2 Sulfate 300.0 03/05/21:202411 MCA Blank mg/L ND <0.5 LCS mg/L 50.00 105% 90-110 MS mg/L 100.0 103% 82-124 (STK2133080-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 1.0% _<23 MS mg/L 100.0 101% 82-124 (STK2133085-001) MSD mg/L 100.0 103% 82-124 MSRPD m 10.00 1.7% <23 300.0 03/05/21:203335MCA CCB mg/L 0.233 0.5 CCV mg/L 50.00 105% 90-110 CCB mg/L 0.222 0.5 CCV m 50.00 105% 90-110 %113AS 5540C 03/05/21:203396jba CCB mg/L -0.0393 0.25 CCV mg/L 1.000 94.9% 90-110 CCB mg/L -0.0393 0.25 CCV MRIL 1.000 94.9% 1 90-110 BAS Extraction 5540C 03/05/21:202528jba Blank mg/L ND <0.1 LCS mg/L 0.5000 95.3% 86-114 BS mg/L 0.5000 95.5% 86-114 BSD mg/L 0.5000 93.8% 86-114 BSRPD m 0.5000 0.0083 <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. 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