(a) Prior to discharge under Sections 4-701 or 4-702, the facility director shall prepare a post-discharge plan which is consistent with the client's habilitation goals. To the extent possible, the client and his family shall be consulted in the preparation and implementation of the plan.(b) Prior to discharge if the client is 18 years of age or older and does not have a guardian, he shall be evaluated to determine whether he requires one. If it is determined that the client requires a guardian, his parent or another interested person shall be notified and requested to file a petition for the appointment of a guardian. If no petition is filed, the facility director of the facility may file such a petition.