If the appeal is not denied within thirty days after the notice is filed with the board, the appeal shall be deemed to have been granted: PROVIDED, That the board may extend the time within which it may act upon such appeal, not exceeding thirty days.
RCW 51.52.090
Effective dates-Severability-1971 ex.s. c 289: See RCW 51.98.060 and 51.98.070.