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May 31, 2022 Lab ID : STK2235809 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 (CH 2272803-001) MSD mg/L 40.00 99.1% 85-119 MSRPD m 10.00 2.4% <19 300.0 04/28/22:206162njb CCB mg/1 0.0780 0.5 CCV mg/1 20.00 94.5% 90-110 CCB mg/1 0.00 0.5 CCV m /1 20.00 94.2% 90-110 Nitrate+Nitrite as N 300.0 04/28/22:204676NJB Blank mg/L ND <0.1 Nitrate Nitrogen 300.0 04/28/22:204676NJB Blank mg/L ND <0.1 Nitrite 300.0 04/28/22:204676NJB Blank mg/L ND <0.5 LCS mg/L 15.00 98.9% 90-110 MS mg/L 30.00 97.5% 74-126 (CH 2272802-001) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 5.4% <20 MS mg/L 30.00 96.6% 74-126 (CH 2272803-001) MSD mg/L 30.00 99.2% 74-126 MSRPD m 10.00 2.6% <20 300.0 04/28/22:206162njb CCB mg/1 0.00 0.5 CCV mg/1 15.00 95.5% 90-110 CCB mg/1 0.00 0.5 CCV mg/1 15.00 95.3% 90-110 Nitrite Nitrogen 300.0 04/28/22:204676NJB Blank m ND <0.2 Sulfate 300.0 04/28/22:204676NJB Blank mg/L ND <0.5 LCS mg/L 50.00 101% 90-110 MS mg/L 100.0 96.9% 82-124 (CH 2272802-001) MSD mg/L 100.0 103% 82-124 MSRPD mg/L 10.00 5.4% <23 MS mg/L 100.0 96.4% 82-124 (CH 2272803-001) MSD mg/L 100.0 99.0% 82-124 MSRPD mg/L 10.00 2.6% <23 300.0 04/28/22:206162njb CCB mg/1 0.169 0.5 CCV mg/1 50.00 97.4% 90-110 CCB mg/1 0.170 0.5 CCV mg/1 50.00 97.1% 90-110 BAS 5540C 04/29/22:206220jba 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 (STK2235807-001) 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