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May 6, 2022 Lab ID : STK2235426 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Quality Control - Inorganic <br />Constituent <br />Method <br />Date/H) <br />Type <br />Units <br />Cone. <br />QC Data <br />DQO <br />Note <br />Wet Chem <br />Nitrate <br />300.0 <br />(STK2235054-004) <br />MSD <br />mg/L <br />40.00 <br />101% <br />85-119 <br />MSRPD <br />m <br />10.00 <br />7.9% <br /><19 <br />300.0 <br />04/20/22:205693njb <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />20.00 <br />98.1% <br />90-110 <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />20.00 <br />98.2% <br />90-110 <br />Nitrate + Nitrite as N <br />300.0 <br />04/20/22:204322NJB <br />Blank <br />mg/L <br />ND <br />I <0.1 <br />Nitrate Nitrogen <br />300.0 <br />04/20/22:204322NJB <br />Blank <br />mg/L <br />ND <br /><0.1 <br />itrite <br />300.0 <br />04/20/22:204322NIB <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />15.00 <br />99.5% <br />90-110 <br />MS <br />mg/L <br />30.00 <br />95.6% <br />74-126 <br />(CC 2281181-001) <br />MSD <br />mg/L <br />30.00 <br />103% <br />74-126 <br />MSRPD <br />mg/L <br />10.00 <br />7.6% <br />:520 <br />MS <br />mg/L <br />30.00 <br />93.9% <br />74-126 <br />(STK2235054-004) <br />MSD <br />mg/L <br />30.00 <br />102% <br />74-126 <br />MSRPD <br />mg/L <br />10.00 <br />1 8.1% <br />520 <br />300.0 <br />04/20/22:205693njb <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />15.00 <br />98.5% <br />90-110 <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/1 <br />15.00 <br />98.4% <br />90-110 <br />Nitrite Nitrogen <br />300.0 <br />04/20/22:204322NJB <br />Blank <br />mg/L <br />ND <br /><0.2 <br />Sulfate <br />300.0 <br />04/20/22:204322NJB <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />50.00 <br />101% <br />90-110 <br />MS <br />mg/L <br />100.0 <br />92.7% <br />82-124 <br />(CC 228118 1-00 1) <br />MSD <br />mg/L <br />100.0 <br />100% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />6.7% <br />:523 <br />MS <br />mgt <br />100.0 <br />91.5% <br />82-124 <br />(STK2235054-004) <br />MSD <br />mg/L <br />100.0 <br />99.4% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />7.1% <br />_<23 <br />300.0 <br />04/20/22:205693njb <br />CCB <br />mg/l <br />0.185 <br />0.5 <br />CCV <br />mg/l <br />50.00 <br />99.9% <br />90-110 <br />CCB <br />mg/l <br />0.196 <br />0.5 <br />CCV <br />mg/l <br />50.00 <br />99.6% <br />90-110 <br />BAS <br />5540C <br />04/20/22:205848jba <br />CCB <br />mg/l <br />0.00 <br />0.1 <br />CCV <br />m 1 <br />10.00 <br />100% <br />99-101 <br />MBAs Screen <br />5540C <br />Ms <br />mg/L <br />10.00 <br />100% <br />90-110 <br />(SP 2206441-001) <br />MSD <br />mg/L <br />10.00 <br />100% <br />90-110 <br />MSRPD <br />I TjZL <br />10.00 <br />1 0.0% <br />:50.1 <br />Definition <br />ICB : Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />CCV : Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br />CCB : Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />LCS : Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <br />: Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample <br />MS <br />matrix affects analyte recovery. <br />: Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyte. The recoveries <br />MSD <br />are an indication of how that sample matrix affects analyte recovery. <br />: Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an <br />Dup <br />indication of precision for the preparation and analysis. <br />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br />MSRPD <br />and analysis. <br />ND : Non -detect - Result was below the DQO listed for the analyte. <br />DQO : Data Quality Objective - This is the criteria against which the quality control data is compared. <br />Page 8 of 9 <br />