Wash. Admin. Code § 240-15-020
92-11-017, § 240-15-020, filed 5/12/92, effective 7/1/92; 91-14-040, § 240-15-020, filed 6/27/91, effective 8/16/91. Statutory Authority: Public Law 101-382. 91-02-111, § 240-15-020, filed 1/2/91, effective 1/2/91; 90-22-105, § 240-15-020, filed 11/7/90, effective 1/1/91.