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April 27, 2022 Lab ID : STK2234796 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Quality Control - Inorganic <br />Definition <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 9 of 9 <br />