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September 1, 2021 Lab ID : STK2151557 <br />Ynez Hernandez Customer :3-18848 <br />Quality Control - Inorganic <br />Definition <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 />ND : Non -detect - Result was below the DQO listed for the analyte. <br /><�/a : 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 LCS or CCV recovery. <br />Page 9 of 9 <br />