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January 28, 2022 Lab ID : STK2230878 San Joaquin Co.Environmental Health Dep Customer : 3-17919 Quality Control -Inorganic Constituent Method DatetID Type Units Conc. QC Data DQO Note Wet Chem Nitrate 300.0 (VI 2240198-002) MSD mg/L 40.00 101% 85-119 MSRPD mg/L 10.00 4.2% <19 300.0 01/19/22:200991njb CCB mg/l 0.00 0.5 CCV mg/l 20.00 102% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 20.00 102% 1 90-110 Nitrate+Nitrite as N 300.0 01/19/22:200703NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 01/19/22:200703NJB Blank mg/L ND <0.1 Nitrite 300.0 01/19/22:200703NJB Blank mg/L ND <0.5 LCS mg/L 15.00 97.1% 90-110 MS mg/L 30.00 94.9% 74-126 (VI 2240198-001) MSD mg/L 30.00 101% 74-126 MSRPD mg/L 10.00 5.7% :520 MS mg/L 30.00 96.1% 74-126 (VI 2240198-002) MSD mg/L 30.00 102% 74-126 MSRPD mgtL 10.00 5.8% <20 300.0 01/19/22:200991njb CCB mg/1 0.0520 0.5 CCV mg/1 15.00 102% 90-110 CCB mg/l 0.0520 0.5 CCV mg/l 15.00 101% 90-110 Nitrite Nitrogen 300.0 01/19/22:200703NJB Blank m ND <0.2 Sulfate 300.0 01/19/22:200703NJB Blank mg/L ND <0.5 LCS mg/L 50.00 105% 90-110 MS mg/L 100.0 100% 82-124 (VI 2240198-001) MSD mg/L 100.0 106% 82-124 MSRPD mg/L 10.00 4.9% 523 MS mg/L 100.0 92.9% 82-124 (VI 2240198-002) MSD mg/L 100.0 98.5% 82-124 MSRPD M91L 10.00 1 3.0% <23 300.0 01/19/22:200991njb CCB mg/1 0.146 0.5 CCV mg/l 50.00 110% 90-110 CCB mg/l 0.151 0.5 CCV mg/l 50.00 110% 90-110 MBAS 55400 01/19/22:201365jba CCB mg/l -0.0611 0.25 CCV mg/1 1.000 94.5% 90-110 CCB mg/l -0.0611 0.25 CCV I mg/l 1.000 94.5% 1 90-110 MBAs Extraction 5540C 01/19/22:201030jba Blank mg/L ND <0.1 LCS mg/L 0.5000 94.1% 86-114 BS mg/L 0.5000 99.8% 86-114 BSD mg/L 0.5000 95.4% 86-114 BSRPD __EyVL 0.5000 4.4% 55 DePmition 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. NIS 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