An employer may use supplemental certification to add to the certified pool when:
Wash. Admin. Code § 357-16-135
Statutory Authority: Chapter 41.06 RCW. 05-21-061, § 357-16-135, filed 10/13/05, effective 11/15/05; 05-16-043, § 357-16-135, filed 7/27/05, effective 9/1/05; 05-01-200, § 357-16-135, filed 12/21/04, effective 7/1/05.