Wash. Rev. Code § 49.12.105
An employer may apply to the director for an order for a variance from any rule or regulation establishing a standard for wages, hours, or conditions of labor adopted by the director under this chapter. The director shall issue an order granting a variance if the director determines or decides that the applicant for the variance has shown good cause for the lack of compliance. Any order so issued shall prescribe the conditions the employer must maintain, and the practices, means, methods, operations, standards and processes which the employer must adopt and utilize to the extent they differ from the standard in question. At any time the director may terminate and revoke such order, provided the employer was notified by the director of the termination at least thirty days prior to said termination.
RCW 49.12.105