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May 5, 2021 <br />Lab ID <br />San Joaquin Co. Environmental Health Dep Customer <br />Quality Control - Inorganic <br />STK2135169 <br />3-17919 <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 />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 LCS or CCV recovery. <br />Page 9of9 <br />