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April 29, 2021 Lab ID : STK2134563 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 2142798-001) MSD mg/L 40.00 101 % 85-119 MSRPD mg/L 10.00 0.9% <19 300.0 04/08/21:205201MCA CCB mg/L 0.000 0.5 CCV mg/L 20.00 102% 90-110 CCB mg/L 0.000 0.5 CCV I m 20.00 102% 1 90-110 Nitrate+Nitrite as N 300.0 04/08/21:203777MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 04/08/21:203777MCA Blank mg/L ND <0.1 Nitrite 300.0 04/08/21:203777MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 98.9% 74-126 (CH 2172103-003) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 2.1% 520 MS mg/L 30.00 99.3% 74-126 (V12142798-001) MSD 1119/1. 30.00 100% 74-126 MSRPD m 10.00 1.0% <20 300.0 04/08/21:205201MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 102% 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 102% 90-110 Nitrite Nitrogen 300.0 04/08/21:203777MCA Blank m ND <0.2 Sulfate 300.0 04/08/21:203777MCA Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 102% 82-124 (CH 2172103-003) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 2.1% <23 MS mg/L 100.0 102% 82-124 (VI 2142798-001) MSD mg/L 100.0 103% 82-124 MSRPD m 10.00 1.1% <23 300.0 04/08/21:205201MCA CCB mg/L 0.199 0.5 CCV mg/L 50.00 106% 90-110 CCB mg/L 0.214 0.5 CCV m 50.00 106% 90-110 MBAs 5540C 04/09/21:205225jba CCB mg/L -0.0393 0.25 CCV mg/L 1.000 93.2% 90-110 CCB mg/L -0.0268 0.25 CCV I m 1.000 93.2% 1 90-110 MBAs Extraction 5540C 04/09/21:203870jba Blank mg/L. ND <0.1 LCS mg/L 0.5000 92.8% 86-114 BS mg/L 0.5000 101% 86-114 BSD mg/L 0.5000 94.6% 86-114 BSRPD TLL 0.5000 6.6% <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