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October 19, 2021 Lab ID : STK2154223 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br /> Wet Chem <br /> Nitrite 300.0 10/05/21:211545NJB LCS mg/L 15.00 105% 90-110 <br /> MS mg/L 30.00 108% 74-126 <br /> (STK2154227-001) MSD mg/L 30.00 97.8% 74-126 <br /> MSRPD mg/L 10.00 10.1% <20 <br /> 300.0 10/05/21:215599njb CCB mg/l 0.00 0.5 <br /> CCV mg/I 15.00 105% 90-110 <br /> CCB mg/I 0.00 0.5 <br /> CCV I mg/I 15.00 104% 1 90-110 <br /> Nitrite Nitrogen 300.0 10/05/21:211545NJB Blank mg/L ND <0.2 <br /> Sulfate 300.0 10/05/21:211545NJB Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 105% 90-110 <br /> MS mg/L 100.0 104% 82-124 <br /> (STK2154227-001) MSD mg/L 100.0 93.4% 82-124 <br /> MSRPD mg/L 10.00 10.8% <23 <br /> 300.0 10/05/21:215599njb CCB mg/1 0.180 0.5 <br /> CCV mg/l 50.00 103% 90-110 <br /> CCB mg/1 0.244 0.5 <br /> CCV I mg/1 50.00 103% 90-110 <br /> MBAs 5540C 10/05/21:215929jba CCB mg/I -0.0611 0.25 <br /> CCV mg/1 1.000 96.7% 90-110 <br /> CCB mg/I -0.0611 0.25 <br /> CCV m /l 1.000 96.7% 90-110 <br /> MBAs Extraction 5540C 10/05/21:211853jba Blank mg/L ND <0.1 <br /> LCS mg/L 0.5000 97.2% 86-114 <br /> BS mg/L 0.5000 102% 86-114 <br /> BSD mg/L 0.5000 98.0% 86-114 <br /> BSRPD I m L 0.5000 4.5% <5 <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 /> 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 /> BS :Blank Spikes-A blank is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not <br /> affecting analyte recovery. <br /> BSD :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 /> the preparation process is not affecting 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 /> BSRPD :BS/BSD Relative Percent Difference(RPD)-The BS 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 /> DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Page 8 of 8 <br />