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November 18, 2020 Lab ID : STK2055605 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control-Inorganic Constituent Method Date/ID Type Units Conc. QC Data UQO Note Wet Chem Nitrate 300.0 (STK2050378-008) MSD mg/L 40.00 97.3% 85-119 MSRPD m 10.00 0.4% 519 300.0 11/04/20:217816JMR CCB mg/L 0.000 0.5 CCV mg/L 20.00 97.4% 90-110 CCB mg/L. 0.000 0.5 CCV m 20.00 97.4% 90-110 Nitrate+Nitrite as N 300.0 11/04/20:213073JMR Blank mg/L ND <0.1 Nitrate Nitrogen 100.0 11/04120:213073JMR Blank mg/L ND <0.1 Nitrite 300.0 11/04/20:213073JMR Blank mg/L ND <0.5 LCs mg/L 15.00 99.1% 90-110 MS mg/L 30.00 97.5% 74-126 (SP 2014755-004) MSD ntg/L 30.00 97.5% 74-126 MSRPD mg/L 10.00 0.06% 520 MS mg/L 30.00 97.6% 74-126 (STK2050378-008) MSD mg/L, 30.00 98.0% 74-126 MSRPD mg/L 10.00 0.4% 1 520 300.0 11/04/20:217816JMR CCB mg/L 0.000 0.5 CCV ntg/L 15.00 99.3% 90-110 CCB mg/L 0.000 0.5 CCV m L 15.00 98.7% 90-110 Nitrite Nitrogen 300.0 11/04/20:213073JMR Blank mg/L ND <0.2 Sulfate 300.0 11/04/20:213073JMR Blank mg/L ND <0.5 LCS mg/L 50.00 97.8% 90-110 MS mg/L 100.0 81.6% 82-124 (SP 2014755-004) MSD mg/L 100.0 82.0% 82-124 MSRPD mg/L 10.00 0.3% 523 MS mg/L 100.0 91.4% 82-124 (STK2050378-008) MSD mg/L 100.0 91.8% 82-124 MSRPD mg/L 10.00 0.4% 1 523 300.0 11/04/20:217816JMR CCB mg/L 0.170 0.5 CCV mg 50.00 101% 90-110 CCB mg/L 0.175 0.5 CCV mg/L 50.00 98.2% 90-110 MBAs 55100 11/04/20:217789jba CCB nrg/L -0.0400 0.25 CCV mg/L 1.000 94.4% 90-110 CCB mg/L -0.0400 0.25 CCV -gfL 1.000 94.8% 1 90-110 MBAs Extraction 5540C I I/04/20:213056jba Blank mg/L ND <0.1 LCS mg/L 0.5000 94.8% 86-114 BS mg/L 0.5000 91.8% 86-114 BSD mg/L 0.5000 105% 86-114 BSRPD mg/i. 0.5000 0.066 550.1 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 proem 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.17ie 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