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August 12, 2021 <br />Lab ID : STI(2150124 <br />San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br />Quality Control - Inorganic <br />Definition <br />BSD <br />Dup <br />MSRPD <br />BSRPD <br />ND <br />DQO <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 />410 : Relative Percent Difference (RPD) not within Maximum Allowable Value (MAV). Data was accepted based on the LCS or CCV <br />recovery. <br />Page 9 of 9