Wash. Admin. Code § 458-18-020
Statutory Authority: RCW 84.38.180. 08-16-077, § 458-18-020, filed 7/31/08, effective 8/31/08; 92-15-057, § 458-18-020, filed 7/13/92, effective 8/13/92; 88-13-042 (Order PT 88-9), § 458-18-020, filed 6/9/88; 84-21-010 (Order PT 84-4), § 458-18-020, filed 10/5/84; 81-05-020 (Order PT 81-8), § 458-18-020, filed 2/11/81; Order PT 76-1, § 458-18-020, filed 4/7/76.