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September 22, 2021 Lab ID : STK2152566 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control - Inorganic <br /> F <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 /> 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 /> 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 for the preparation <br /> and analysis. <br /> BS/BSD Relative Percent Difference(RPD)-The BS relative percent difference is an indication of precision for the preparation <br /> and analysis. <br /> :Non-detect-Result was below the DQO listed for the analyte. <br /> :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 360 :CCV above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. <br /> 410 Relative Percent Difference(RPD)not within Maximum Allowable Value(MAV).Data was accepted based on the UCS or CCV <br /> recovery. <br /> 440 :Sample norlhomogeneity may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 10 of 10 <br />