Wash. Admin. Code § 461-08-500
(1) Hearings upon petitions for review shall be quasi-judicial in nature. The scope and standard of review shall be de novo unless otherwise required by law. However, the board shall conduct the following types of hearings on the record compiled by the department:
[Statutory Authority: RCW 90.58.175, 90.58.090, 90.58.140, 90.58.180, and 90.58.190. WSR 13-21-068, § 461-08-500, filed 10/16/13, effective 11/16/13. Statutory Authority: RCW 90.58.175. WSR 02-06-010, § 461-08-500, filed 2/22/02, effective 3/25/02; WSR 96-15-002, § 461-08-500, filed 7/3/96, effective 8/3/96.]