The department of children's services may, by regulation, adopt and prepare additional guidelines for the plans required of agencies; however, no such guidelines shall apply to a licensed child care agency if not applicable to the department. All plans established for the child shall contain at least the following:
(1) The purpose for which the child has been placed in foster care;
(2) The estimated length of time in which the purpose of foster care will be accomplished;
(3) The description of services that are to be provided in order for the purpose of foster care to be accomplished, including those services to be provided to the family; and
(4) The person within the department or agency who is directly responsible for assuring that the plan is implemented.