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May 6, 2022 Lab ID : STK2235428 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control- Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Nitrate 300.0 (STK2235054-004) MSD mg/L 40.00 101% 85-119 MSRPD mg/L 10.00 7.9% <19 300.0 04/20/22:205693njb CCB mg/l 0.00 0.5 CCV mg/l 20.00 98.1% 90-110 CCB mg/l 0.00 0.5 CCV mg/l 20.00 98.2% 90-110 Nitrate+Nitrite as N 300.0 04/20/22:204322NJB Blank mg/L ND I <0.1 Nitrate Nitrogen 300.0 04/20/22:204322NJB Blank mg/L ND <0.1 itrite 300.0 04/20/22:204322NJB Blank mg/L ND <0.5 LCS mg/L 15.00 99.5% 90-110 MS mg/L. 30.00 95.6% 74-126 (CC 228118 1-00 1) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 7.6% :520 MS mg/L 30.00 93.9% 74-126 (STK2235054-004) MSD mg/L 30.00 102% 74-126 MSRPD m 10.00 8.1% 1 <20 300.0 04/20/22:205693njb CCB mg/l 0.00 0.5 CCV mg/l 15.00 98.5% 90-110 CCB mg/l 0.00 0.5 CCV m 15.00 98.4% 90-110 Nitrite Nitrogen 300.0 04/20/22:204322NJB Blank mg/L ND <0.2 Sulfate 300.0 04/20/22:204322NJB Blank mg/L ND <0.5 LCS mg/L 50.00 101% 90-110 MS mg/L 100.0 92.7% 82-124 (CC 2281181-00 1) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 6.7% :523 MS mg/L 100.0 91.5% 82-124 (STK2235054-004) MSD mg/L 100.0 99.4% 82-124 MSRPD mg/L 10.00 7.1% <23 300.0 04/20/22:205693njb CCB mg/l 0.185 0.5 CCV mg/l 50.00 99.9% 90-110 CCB mg/l 0.196 0.5 CCV mg/l 50.00 99.6% 90-110 BAS 5540C 04/20/22:205848jba CCB mg/l 0.00 0.1 CCV mg/1 10.00 100% 99-101 BAs Screen 5540C MS mg/L 10.00100% 90-110 100% 90-110 (SP 2206441-001) MSD mg/L 10.00 MSRPD m 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. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. Page 8 of 9