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December 30, 2021 Lab ID : STK2157973 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control - Inorganic <br /> Definition <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 /> <'/4 :High Sample Background-Spike concentration was less than one forth of the sample concentration. <br /> DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 435 :Sample matrix may be affecting this analyte.Data was accepted based on the L.CS or CCV recovery. <br /> Page 9 of 9 <br />