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April 20, 2022 Lab ID : STK2234449 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Quality Control - Inorganic <br />Constituent <br />Method <br />Date/Ill <br />Type <br />Units <br />Conc. <br />QC Data <br />DQO <br />Note <br />Wet Chem <br />Nitrate <br />300.0 <br />(STK2234059-002) <br />MSD <br />mg/L <br />40.00 <br />96.7% <br />85-119 <br />MSRPD <br />mg/L <br />10.00 <br />4.5% <br />5519 <br />300.0 <br />04/05/22:204911njb <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />20.00 <br />100% <br />90-110 <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />20.00 <br />100% <br />90-110 <br />Nitrate + Nitrite as N <br />300.0 <br />04/05/22:2036757JB <br />Blank <br />mg/L <br />ND <br /><0.I <br />Nitrate Nitrogen <br />300.0 <br />04/05/22:203675NJB <br />Blank <br />mg/L <br />ND <br /><0.1 <br />itrite <br />300.0 <br />04/05/22:203675NJB <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />15.00 <br />95.5% <br />90-110 <br />MS <br />mg/L <br />30.00 <br />94.4% <br />74-126 <br />(STK2234059-001) <br />MSD <br />mg/L <br />30.00 <br />101% <br />74-126 <br />MSRPD <br />mg/L <br />10.00 <br />6.5% <br />5520 <br />MS <br />mg/L <br />30.00 <br />94.4% <br />74-126 <br />(STK2234059-002) <br />MSD <br />mg/L <br />30.00 <br />100% <br />74-126 <br />MSRPD <br />m <br />10.00 <br />6.2% <br />520 <br />300.0 <br />04/05/22:204911njb <br />CCB <br />mg/1 <br />0.00 <br />0.5 <br />CCV <br />mg/1 <br />15.00 <br />101% <br />90-110 <br />CCB <br />mg/1 <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />15.00 <br />101% <br />1 90-110 <br />Nitrite Nitrogen <br />300.0 <br />04/05/22:203675NJB <br />Blank <br />mg/L <br />ND <br /><0.2 <br />Sulfate <br />300.0 <br />04/05/22:203675NJB <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />50.00 <br />95.7% <br />90-110 <br />MS <br />mg/L <br />100.0 <br />91.8% <br />82-124 <br />(STK2234059-001) <br />MSD <br />mg/L <br />100.0 <br />98.3% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />6.3% <br />5523 <br />MS <br />mg/L <br />100.0 <br />91.0% <br />82-124 <br />(STK2234059-002) <br />MSD <br />mg/L <br />100.0 <br />97.3% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />6.2% <br />:523 <br />300.0 <br />04/05/22:204911njb <br />CCB <br />mg/l <br />0.186 <br />0.5 <br />CCV <br />mg/l <br />50.00 <br />101% <br />90-t 10 <br />CCB <br />mg/l <br />0.195 <br />0.5 <br />CCV <br />mg/l <br />50.00 <br />101% <br />90-110 <br />MBAs <br />5540C <br />04/06/22:205056jba <br />CCB <br />mg/1 <br />0.00 <br />0.1 <br />CCV <br />mg/l <br />10.00 <br />100% <br />99-101 <br />BAS Screen <br />55400 <br />MS <br />mg/L <br />10.00 <br />100% <br />90-110 <br />(STK2234451-001) <br />MSD <br />mg/L <br />10.00 <br />100% <br />90-110 <br />MSRPD <br />I m <br />10.00 <br />1 0.0% <br />1 :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 />