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May 31, 2022 Lab ID : STK2236202 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 2281514-001) MSD mg/L 40.00 99.9% 85-119 MSRPD m 10.00 4.6% <19 300.0 05/18/22:207306njb CCB mg/1 0.0240 0.5 CCV mg/1 20.00 99.2% 90-110 CCB mg/1 0.00 0.5 CCV m /1 20.00 98.9% 90-110 Nitrate+Nitrite as N 300.0 05/18/22:205495NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 05/18/22:205495NJB Blank mg/L ND <0.1 Nitrite 300.0 05/18/22:205495NJB Blank mg/L ND <0.4 LCS mg/L 15.00 99.6% 90-110 MS mg/L 30.00 96.2% 74-126 (STK2235995-003) MSD mg/L 30.00 99.4% 74-126 MSRPD mg/L 10.00 3.3% <20 MS mg/L 30.00 96.3% 74-126 (CC 2281514-001) MSD mg/L 30.00 101% 74-126 MSRPD m 10.00 5.2% <20 300.0 05/18/22:207306njb CCB mg/1 0.0580 0.5 CCV mg/1 15.00 101% 90-110 CCB mg/1 0.0590 0.5 CCV mg/1 15.00 101% 90-110 Nitrite Nitrogen 300.0 05/18/22:205495NJB Blank m ND <0.1 Sulfate 300.0 05/18/22:205495NJB Blank mg/L ND <0.5 LCS mg/L 50.00 100% 90-110 MS mg/L 100.0 95.2% 82-124 (STK2235995-003) MSD mg/L 100.0 98.4% 82-124 MSRPD mg/L 10.00 3.3% <23 MS mg/L 100.0 86.8% 82-124 (CC 2281514-001) MSD mg/L 100.0 91.5% 82-124 MSRPD mg/L 10.00 3.3% <23 300.0 05/18/22:207306njb CCB mg/1 0.149 0.5 CCV mg/1 50.00 101% 90-110 CCB mg/1 0.150 0.5 CCV mg/1 50.00 100% 90-110 BAS 5540C 05/06/22:206593jba CCB mg/1 0.00 0.1 CCV mg/1 10.00 100% 99-101 BAS Screen 5540C MS mg/L 10.00 100% 90-110 (STK2236212-001) MSD mg/L 10.00 100% 90-110 MSRPD m L 10.00 0.0% <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. Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. <y, :High Sample Background-Spike concentration was less than one forth of the sample concentration. Page 8 of 9