In all appeals taken pursuant to RCW 84.08.130 the assessor or taxpayer shall submit evidence of comparable sales to be used in a hearing to the board and to all parties at least ten business days in advance of such hearing. Failure to comply with the requirements set forth in this section shall be grounds for the board, upon objection, to continue the hearing or refuse to consider evidence not timely submitted.
RCW 82.03.200