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May 18, 2021 Lab ID : STK2136229 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 (VI 2143433-002) MSD mg/L 40.00 93.7% 85-119 MSRPD mg/L 10.00 0.6% <19 300.0 05/07/21:206925MCA CCB mg/L 0.082 0.5 CCV mg/L 20.00 100% 90-110 CCB mg/L 0.086 0.5 CCV m 20.00 99.8% 90-110 Nitrate+Nitrite as N 300.0 05/07/21:205045MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 05/07/21:205045MCA Blank mg/L ND <0.1 Nitrite 300.0 05/07/21:205045MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 102% 74-126 (SP 2105749-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 1.8% :520 MS mg/L 30.00 103% 74-126 (VI 2143433-002) MSD mg/L 30.00 105% 74-126 MSRPD mg/L 10.00 1.5% <20 300.0 05/07/21:206925MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 99.6% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 99.8% 90-110 Nitrite Nitrogen 300.0 05/07/21:205045MCA Blank mg/L ND <0.2 Sulfate 300.0 05/07/21:205045MCA Blank mg/L ND <0.5 LCS mg/L 50.00 103% 90-110 MS mg/L 100.0 98.1% 82-124 (SP 2105749-001) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 1.6% <23 MS mg/L 100.0 97.0% 82-124 (VI 2143433-002) MSD mg/L 100.0 98.7% 82-124 MSRPD mg/L 10.00 1.2% <23 300.0 05/07/21:206925MCA CCB mg/L 0.183 0.5 CCV mg/L 50.00 99.8% 90-110 CCB mg/L 0.175 0.5 CCV mg/L 50.00 99.5% 90-110 MBAs 5540C 05/07/21:207001jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 96.1 % 90-110 CCB mg/L -0.0351 0.25 CCV I mg/L 1.000 95.3% 1 90-110 MBAS Extraction 5540C 05/07/21:205230jba Blank mg/L ND <0.1 LCS mg/L 0.5000 96.1 % 86-114 BS mg/L 0.5000 94.2% 86-114 BSD mg/L 0.5000 96.3% 86-114 BSRPD E&/L_ 0.5000 0.010 <0.1 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 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 8of9