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January 28, 2019 Lab ID : STK1930714 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Quality Control - Inorganic <br />Definition <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 />DQO : Data Quality Objective - This is the criteria against which the quality control data is compared. <br />Explanation <br />4» : Sample matrix may be affecting this analvte. Data was accented based on the L.CS or CCV recovery. <br />Page 9 of 9 <br />