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April 14, 2021 Lab ID : STK2134147 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 (CC 2180980-001) MSD mg/L 40.00 89.3% 85-119 MSRPD mg/L 10.00 0.04% <19 300.0 03/31/21:204969MCA ICB mg/L 0.000 0.5 ICV mg/L 20.00 104% 90-110 CCB mg/L 0.000 1 0.5 CCV mg/l, 20.00 105% 90-110 Nitrate+Nitrite as N 300.0 03/31/21:203472MCA Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 03/31/21:203472MCA Blank mg/L ND <0.1 Nitrite 300.0 03/31/21:203472MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 103% 74-126 (STK2134147-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 0.8% 520 MS mg/L 30.00 103% 74-126 (CC 2180980-001) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 0.09% 520 300.0 03/31/21:204969MCA ICB mg/L 0.000 0.5 ICV mg/L 15.00 104% 90-110 CCB mg/L 0.000 0.5 CCV mg/L 15.00 104% 90-110 Nitrite Nitrogen 300.0 03/31/21:203472MCA Blank m ND <0.2 Sulfate 300.0 03/31/21:203472MCA Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 105% 82-124 (STK2134147-001) MSD mg/L 100.0 106% 82-124 MSRPD mg/L 10.00 1.0% _<23 MS mg/L 100.0 105% 82-124 (CC 2180980-001) MSD mg/L 100.0 106% 82-124 MSRPD mg/L 10.00 0.3% _<23 300.0 03/31/21:204969MCA ICB mg/L 0.198 0.5 ICV mg/L 50.00 106% 90-110 CCB mg/L 0.203 0.5 CCV mg/L 50.00 107% 90-110 MBAs 5540C 03/31/21:205150jba CCB mg/L -0.0351 0.25 CCV mg/L 1.000 93.6% 90-110 CCB mg/L -0.0351 0.25 CCV m 1.000 93.6% 1 90-110 BAS Extraction 5540C 03/31/21:203866jba Blank mg/L ND <0.1 LCS mg/L 0.5000 94.1% 86-114 BS mg/L 0.5000 91.3% 86-114 BSD mg/L 0.5000 96.3% 86-114 BSRPD TPL, 0.5000 0.025 <0.1 Definition ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. 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