Wash. Rev. Code § 85.16.130
At the hearing upon the report of the appraisers, which may be adjourned from time to time until finally completed, the board shall carefully examine and consider the special benefits and the apportionment of estimated costs determined by the appraisers and reported in the schedule or schedules, and any objections thereto which shall have been made in writing and filed with the board on or prior to ten o'clock a.m. of the date fixed for such hearing. Each objector shall be given reasonable time and opportunity to submit evidence and be heard on the merits of his or her objections. At the conclusion of such hearing, the board shall so correct, revise, raise, lower, change, or modify such schedule or schedules, or any part thereof, or strike therefrom any property not specially benefited, as to said board shall appear equitable and just. The board shall cause the clerk of the board to enter on each such schedule or schedules all such additions, cancellations, changes, and modifications made by it.
RCW 85.16.130