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June 23, 2021 Lab ID : STK2137082 <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 + Nitrite as <br />N <br />450ONO3F <br />(SP 2106711 -00 1) <br />MSD <br />mg/L <br />5.609 <br />96.0% <br />5-285 <br />MSRPD <br />m <br />5.609 <br />0.1% <br /><_30.4 <br />450ONO3F <br />05/20/21:207567VVH <br />CCB <br />mg/L <br />0.088 <br />0.2 <br />CCV <br />mg/L <br />11.22 <br />97.0% <br />90-110 <br />CCB <br />mg/L <br />0.162 <br />0.2 <br />CCV <br />m <br />11.22 <br />96.7% <br />90-110 <br />Nitrate as NO3 <br />450ONO3F <br />05/20/21:205642VVH <br />Blank <br />mg/L <br />ND <br /><0.9 <br />Nitrate Nitrogen <br />450ONO3F <br />05/20/21:205642VVH <br />Blank <br />m <br />ND <br /><0.2 <br />Nitrite as Nitrogen <br />450ONO3F <br />05/20/21:205643VVH <br />Blank <br />mg/L <br />ND <br /><0.2 <br />LCS <br />mg/L <br />1.218 <br />100% <br />80-120 <br />MS <br />mg/L <br />0.6090 <br />98.0% <br />50-150 <br />(SP 2106711 -00 1) <br />MSD <br />mg/L <br />0.6090 <br />98.9% <br />50-150 <br />MSRPD <br />m <br />0.6090 <br />0.0050 <br />1 :50.2 <br />450ONO3F <br />05/20/21:207564VVH <br />CCB <br />mg/L <br />0.00800 <br />0.012 <br />CCV <br />mg/L <br />1.218 <br />101% <br />90-110 <br />CCB <br />mg/L <br />0.00800 <br />0.012 <br />CCV <br />m <br />1.218 <br />101% <br />90-110 <br />BAs <br />5540C <br />05/20/21:208000jba <br />CCB <br />mg/L <br />-0.0351 <br />0.25 <br />CCV <br />mg/L <br />1.000 <br />96.1% <br />90-110 <br />CCB <br />mg/L <br />-0.0351 <br />0.25 <br />CCV <br />m <br />1.000 <br />96.1% <br />90-110 <br />MBAs Extraction <br />5540C <br />05/20/21:205941jba <br />Blank <br />mg/L <br />ND <br /><0.1 <br />LCS <br />mg/L <br />0.5000 <br />94.9% <br />86-114 <br />BS <br />mg/L <br />0.5000 <br />92.1 % <br />86-114 <br />BSD <br />mg/L <br />0.5000 <br />94.2% <br />86-114 <br />BSRPD <br />T.LL <br />0.5000 <br />0.010 <br /><_0.1 <br />Definition <br />ICB <br />: Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />CCV <br />: Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br />CCB <br />: Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />Blank <br />: Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />- <br />LCS <br />: 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. <br />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 />: Blank Spike Duplicate of BS/BSD pair - A blank duplicate is spiked with a known amount of analyte. It is prepared to verify that <br />BSD <br />the preparation process is not affecting analyte recovery. <br />: Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an <br />Du P <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 <br />for the preparation <br />MSRPD <br />and analysis. <br />: BS/BSD Relative Percent Difference (RPD) - The BS relative percent difference is an indication of precision for the preparation <br />BSRPD <br />and analysis. <br />ND <br />: Non -detect - Result was below the DQO listed for the analyte. <br /><i/< <br />High Sample Background - Spike concentration was less than one forth of the sample concentration. <br />DQO <br />: Data Quality Objective - This is the criteria against which the quality control data is compared. <br />Explanation <br />435 <br />: Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />Page 8 of 8 <br />