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March 2, 2021 Lab ID : STK2131533 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control-Inorganic <br /> Definition <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 />