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March 23, 2021 Lab ID : STK2133084 <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 />Cone <br />QC Data <br />DQO <br />Note <br />Wet Chem <br />Nitrate <br />300.0 <br />(STK2133085-001) <br />MSD <br />mg/L <br />40.00 <br />93.0% <br />85-119 <br />MSRPD <br />mg/L <br />10.00 <br />0.8% <br /><19 <br />300.0 <br />03/05/21:203335MCA <br />CCB <br />mg/L <br />0.000 <br />0.5 <br />CCV <br />mg/L <br />20.00 <br />104% <br />90-110 <br />CCB <br />mg/L <br />0.083 <br />0.5 <br />CCV <br />m L <br />20.00 <br />103% <br />90-110 <br />itrate + Nitrite as N <br />300.0 <br />03/05/21:202411 MCA <br />Blank <br />mg/L <br />ND <br /><0.1 <br />Nitrate Nitrogen <br />300.0 <br />03/05/21:202411 MCA <br />Blank <br />mg/L <br />ND <br /><0.1 <br />Nitrite <br />300.0 <br />03/05/21:202411 MCA <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />15.00 <br />103% <br />90-110 <br />MS <br />mg/L <br />30.00 <br />103% <br />74-126 <br />(STK2133080-001) <br />MSD <br />mg/L <br />30.00 <br />104% <br />74-126 <br />MSRPD <br />mg/L <br />10.00 <br />0.5% <br /><20 <br />MS <br />mg/L <br />30.00 <br />102% <br />74-126 <br />(STK2133085-001) <br />MSD <br />mg/L <br />30.00 <br />104% <br />74-126 <br />MSRPD <br />m <br />10.00 <br />1.5% <br /><20 <br />300.0 <br />03/05/21:203335MCA <br />CCB <br />mg/L <br />0.000 <br />0.5 <br />CCV <br />mg/L <br />15.00 <br />104% <br />90-110 <br />CCB <br />mg/L <br />0.000 <br />0.5 <br />CCV <br />m L <br />15.00 <br />103% <br />90-110 <br />Nitrite Nitrogen <br />300.0 <br />03/05/21:202411 MCA <br />Blank <br />mg/L <br />ND <br /><0.2 <br />Sulfate <br />300.0 <br />03/05/21:202411 MCA <br />Blank <br />mg/L <br />ND <br /><0.5 <br />LCS <br />mg/L <br />50.00 <br />105% <br />90-110 <br />MS <br />mg/L <br />100.0 <br />103% <br />82-124 <br />(STK2133080-001) <br />MSD <br />mg/L <br />100.0 <br />104% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />1.0% <br /><23 <br />MS <br />mg/L <br />100.0 <br />101% <br />82-124 <br />(STK2133085-001) <br />MSD <br />mg/L <br />100.0 <br />103% <br />82-124 <br />MSRPD <br />mg/L <br />10.00 <br />1.7% <br /><_23 <br />300.0 <br />03/05/21:203335MCA <br />CCB <br />mg/L <br />0.222 <br />0.5 <br />CCV <br />mg/L <br />50.00 <br />105% <br />90-110 <br />CCB <br />mg/L <br />0.272 <br />0.5 <br />CCV <br />m <br />50.00 <br />105% <br />90-110 <br />BAS <br />5540C <br />03/05/21:203396jba <br />CCB <br />mg/L <br />-0.0393 <br />0.25 <br />CCV <br />mg/L <br />1.000 <br />94.9% <br />90-110 <br />CCB <br />mg/L <br />-0.0393 <br />0.25 <br />CCV <br />m L <br />1.000 <br />94.9% <br />1 90-110 <br />BAS Extraction <br />5540C <br />03/05/21:202528jba <br />Blank <br />mg/L <br />ND <br /><0.1 <br />LCS <br />mg/L <br />0.5000 <br />95.3% <br />86-114 <br />BS <br />mg/L <br />0.5000 <br />95.5% <br />86-114 <br />BSD <br />mg/L <br />0.5000 <br />93.8% <br />86-114 <br />BSRPD <br />I mg/L <br />0.5000 <br />0.0083 <br />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 />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 />: Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not <br />BS <br />affecting analyte recovery. <br />Page 8of9 <br />