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April 13, 2022 Lab ID : STK2234270 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Quality Control - Inorganic <br />Constituent <br />Method <br />Date/ID <br />Type <br />Units <br />Conc. <br />QC Data <br />DQO <br />Note <br />Wet Chem <br />Nitrate <br />300.0 <br />(STK223419 1 -00 1) <br />MSD <br />mg/L <br />40.00 <br />100% <br />85-119 <br />MSRPD <br />mg/L <br />10.00 <br />5.7% <br />519 <br />300.0 <br />03/31/22:204662njb <br />ICB <br />mg/1 <br />0.00 <br />0.5 <br />ICV <br />mg/l <br />20.00 <br />98.7% <br />90-110 <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/l <br />20.00 <br />99.9% <br />90-110 <br />itrate + Nitrite as N <br />300.0 <br />03/31/22:203511NJB <br />Blank <br />mg/L <br />ND <br />I <0.1 <br />Nitrate Nitrogen <br />300.0 <br />03/31/22:203511NJB <br />Blank <br />mg/L <br />ND <br /><0.1 <br />Nitrite <br />300.0 <br />03/31/22:203511NJB <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />15.00 <br />97.7% <br />90-110 <br />Ms <br />mg/L <br />30.00 <br />96.9% <br />74-126 <br />(STK2234058-001) <br />MSD <br />mg/L <br />30.00 <br />104% <br />74-126 <br />MSRPD <br />mg/L <br />10.00 <br />7.3% <br />5520 <br />MS <br />mg/L <br />30.00 <br />95.8% <br />74-126 <br />(STK2234191-001) <br />MSD <br />mg/L <br />30.00 <br />102% <br />74-126 <br />MSRPD <br />m <br />10.00 <br />6.3% <br />1 :520 <br />300.0 <br />03/31/22:204662njb <br />ICB <br />mg/1 <br />0.00 <br />0.5 <br />ICV <br />mg/1 <br />15.00 <br />99.9% <br />90-110 <br />CCB <br />mg/l <br />0.00 <br />0.5 <br />CCV <br />mg/1 <br />15.00 <br />101% <br />90-110 <br />Nitrite Nitrogen <br />300.0 <br />03/31/22:20351 INJB <br />Blank <br />mg/L <br />ND <br /><0.2 <br />Sulfate <br />300.0 <br />03/31/22:203511NJB <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />50.00 <br />97.6% <br />90-110 <br />MS <br />mg/L <br />100.0 <br />92.7% <br />82-124 <br />(STK2234058-001) <br />MSD <br />mg/L <br />100.0 <br />100% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />6.5% <br />523 <br />MS <br />mg/L <br />100.0 <br />93.1% <br />82-124 <br />(STK223419 1 -00 1) <br />MSD <br />mg/L <br />100.0 <br />99.2% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />6.1% <br />1 :523 <br />300.0 <br />03/31/22:204662njb <br />ICB <br />mg/l <br />0.172 <br />0.5 <br />ICV <br />mg/l <br />50.00 <br />100% <br />90-110 <br />CCB <br />mg/l <br />0.183 <br />0.5 <br />CCV <br />mg/l <br />50.00 <br />101% <br />90-110 <br />AS <br />5540C <br />03/31/22:204843jba <br />CCB <br />mg/l <br />0.00 <br />0.1 <br />CCV <br />mg/l <br />10.00 <br />100% <br />99-101 <br />BAS Screen <br />5540C <br />MS <br />mg/L <br />10.00 <br />100% <br />90-110 <br />(CH 2272031-001) <br />MSD <br />mg/L <br />10.00 <br />100% <br />90-110 <br />MSRPD <br />TfIL <br />10.00 <br />0.0% <br />1 50.1 <br />Definition <br />ICV : Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <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 />MS : Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample <br />matrix affects analyte recovery. <br />MSD : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyte. The recoveries <br />are an indication of how that sample matrix affects analyte recovery. <br />Dup : Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an <br />indication of precision for the preparation and analysis. <br />MSRPD : MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br />and analysis. <br />ND : Non -detect - Result was below the DQO listed for the analyte. <br />Page 9 of 10 <br />