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June 23, 2021 Lab ID : STK2137438 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 2143301-002) MSD mg/L 40.00 104% 85-119 MSRPD mg/L 10.00 0.3% <19 300.0 05/27/21:208032MCA CCB mg/L 0.000 0.5 CCV mg/L 20.00 104% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 20.00 104% 90-110 Nitrate + Nitrite as N 300.0 05/27/21:205936MCA Blank mg/L ND <0.I Nitrate Nitrogen 300.0 05/27/21:205936MCA Blank mg/L ND <0.1 Nitrite 300.0 05/27/21:205936MCA Blank mg/L ND <0.5 LCS mg/L 15.00 101 % 90-110 MS mg/L 30.00 102% 74-126 (CC 2181337-002) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 0.3% <20 MS mg/L 30.00 102% 74-126 (VI 2143301-002) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 0.4% <20 300.0 05/27/21:208032MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 103% 90-110 Nitrite Nitrogen 300.0 05/27/21:205936MCA Blank mg1L ND <0.2 Sulfate 300.0 05/27/21:205936MCA Blank mg/L ND <0.5 LCS mg/L 50.00 101 % 90-110 MS mg/L 100.0 90.5% 82-124 (CC 2181337-002) MSD mg/L 100.0 91.3% 82-124 MSRPD mg/L 10.00 0.5% <_23 MS mg/L 100.0 101% 82-124 (VI 2143301-002) MSD mg/L 100.0 102% 82-124 MSRPD mg1L 10.00 0.6% <23 300.0 05/27/21:208032MCA CCB mg/L 0.176 0.5 CCV mg/L 50.00 103% 90-110 CCB mg/L 0.182 0.5 CCV m 50.00 103% 90-110 MBAs 5540C 05/27/21:208246jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 93.6% 90-110 CCB mg/L -0.0310 0.25 CCV mg/L 1.000 93.6% 1 90-110 MBAs Extraction 5540C 05/27/21:206095jba Blank mg/L ND <0.1 LCS mg/L 0.5000 93.6% 86-114 BS mg/L 0.5000 90.1% 86-114 BSD mg/L 0.5000 93.0% 86-114 BSRPD Ey/l, 0.5000 0.015 <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 8 of 9