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June 9, 2021 Lab ID <br />San Joaquin Co. Environmental Health Dep Customer <br />Quality Control - Inorganic <br />Definition <br />: STK2135836 <br />:3-17919 <br />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br />and analysis. <br />: BS/BSD Relative Percent Difference (RPD) - The BS relative percent difference is an indication of precision for the preparation <br />and analysis. <br />Non -detect - Result was below the DQO listed for the analyte. <br />Data Oualitv Obiective - This is the criteria aeainst which the duality control data is comnared. <br />1Explanation <br />360 : CCV above Acceptance Range (AR). Samples which were non detect for this analyte were accepted. <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 />