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April 13, 2022 Lab ID : STK2234268 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Quality Control - Inorganic <br />Definition <br /><'/< : 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 />Page 10 of 10 <br />