(1) Initial orders on brief adjudicative proceedings become final twenty-one days after service of the initial order unless:

(a) Administrative review has been requested pursuant to WAC 246-11-550; or

(b) On its own initiative, the board determines to review the matter and, within twenty-one days of service of the initial order, provides notice to the parties of the date by which a determination will be made.

(2) If review is taken under subsection (1) of this section, each party must be provided an opportunity to state its view of the matter, and a written order containing findings of fact, conclusions of law, and order must be entered and served upon the parties within twenty days of service of the initial order or the request for review, whichever is later.

(3) A request for review is deemed to be denied if the board does not act on the request within twenty days after the request is submitted.

(4) If administrative review is taken under subsection (1) of this section, the presiding officer may convert the matter to a full adjudicative proceeding.