(1) Notice of independent appearance. A complainant or aggrieved person under RCW 49.60.040(15) who desires to submit testimony or otherwise participate in the hearing as a party and not to leave the case in support of the complaint to be presented solely by counsel for the commission, must serve and file a notice of independent appearance within ten days after the notice of hearing is served on that complainant. The notice shall state the address where notices to the complainant shall be sent and it shall state whether the complainant elects to prove additional charges as provided in subsection (2) of this section.

(2) Election to prove additional charges. A complainant or aggrieved person under RCW 49.60.040(15) who has filed a notice of independent appearance stating an intention to prove additional charges in accordance with RCW 49.60.250(2), may at the hearing offer proof of averments included in the original complaint or in amendments to the original complaint made by the complainant, whether or not the averments are included in the amended complaint under which counsel for the commission is proceeding. For purposes of this section, the complainant may amend the original complaint without regard to intervening amendments made by the commission. The complainant may serve and file an amended complaint with a notice of independent appearance, or thereafter as provided by these rules. If no amended complaint is served with a notice of independent appearance that states an intention to prove additional charges, the clerk shall promptly place the original complaint in the file for the administrative law judge. Nothing done by the complainant under this rule shall place any duty on counsel for the commission to seek to prove matters not averred in the amended complaint accompanying the notice of hearing, or subsequent amendments by the commission.

(3) Appearance without election. If the complainant or aggrieved person under RCW 49.60.040(15) files a notice of independent appearance which does not state that he or she elects to prove additional charges, then the complainant's participation in the hearing shall be confined to the matters raised by the amended complaint filed with the notice of hearing, and subsequent amendments made by the commission.

(4) When no independent appearance. If the complainant or aggrieved person under RCW 49.60.040(15) does not file a notice of independent appearance as provided by this rule, the case in support of the complaint shall be presented solely by counsel for the commission.