(a) The board may issue a complaint to any person on whom civil liability may be imposed pursuant to this article. The complaint shall allege the acts or failures to act that constitute a basis for liability and the amount of the proposed civil liability. The complaint shall be served by personal service or certified mail and shall inform the party so served that a hearing shall be conducted within 60 days after the party has been served, unless the party waives the right to a hearing.
(b) If the party waives the right to a hearing, the board shall issue an order setting liability in the amount proposed in the complaint unless the board and the party have entered into a settlement agreement, in which case the board shall issue an order setting liability in the amount specified in the settlement agreement. If the party has waived the right to a hearing or if the board and the party have entered into a settlement agreement, the order shall not be subject to review by any court or agency.