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March 2, 2021 Lab ID : STK2131947 <br />San Joaquin Co. Environmental Health Dep Customer :3-17919 <br />Inorganic - Wet Chemistry QC <br />2540CL <br />02/10/2021:201489 All preparation quality controls are within established criteria (performed at FGL-SP <br />ELAN 1573). <br />300.0 <br />02/09/2021:202017 All analysis quality controls are within established criteria. <br />02/09/2021:201408 All preparation quality controls are within established criteria (performed at FGL-SP <br />ELAN 1573), except: <br />The following note applies to Chloride: <br />435 Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />5540C <br />02/10/2021:202358 All analysis quality controls are within established criteria. <br />02/10/2021:201755 All preparation quality controls are within established criteria (performed at FGL-SP <br />ELAN 1573). <br />Certification:: I certify that this data package is in compliance with ELAP standards, both technically <br />and for completeness, except for any conditions listed above. Release of the data contained in this data <br />package is authorized by the Laboratory Director or his designee, as verified by the following electronic <br />signature. <br />Digitally signed by Kelly A. D—ahoo. B.S. <br />Approved By Kelly A. Dunnahoo, B.S. SWe: laboratory Director <br />Date: 2021-03-02 <br />Page 2 of 9 <br />