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January 28, 2022 Lab ID : STK2230464 <br />San Joaquin Co. Environmental Health Dep Customer A-17919 <br />Inorganic - Wet Chemistry QC <br />2540CE <br />01/12/2022:200398 All preparation quality controls are within established criteria (performed at FGL-SP <br />ELAN 1573) <br />300.0 <br />01/11/2022:200598 All analysis quality controls are within established criteria <br />01/11/2022:200350 All preparation quality controls are within established criteria (performed at FGL-SP <br />ELAN 1573) <br />5540C <br />01/11/2022:200918 All analysis quality controls are within established criteria <br />01/11/2022:200701 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 />KD:MKH <br />Digitally signed by Kelly A. Dunnahoo, B.S. <br />Approved By Kelly A. Dunnahoo, B.S. Title: Laboratory Director <br />Date: 2022-01-28 <br />Page 2 of 9 <br />