Wash. Admin. Code § 296-803-60015
(1) You must retrain authorized and affected employees to introduce new or revised control methods and procedures when there is a change in any of the following:
(2) You must retrain employees to reestablish proficiency when:
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 17-18-075, § 296-803-60015, filed 9/5/17, effective 10/6/17; WSR 09-16-108, § 296-803-60015, filed 8/4/09, effective 11/1/09; WSR 04-15-105, § 296-803-60015, filed 7/20/04, effective 11/1/04.]