Notwithstanding Section 319, a dependent child who is 6 to 12 years of age, inclusive, may be placed in a community care facility licensed as a group home for children, a short-term residential treatment center, or in a temporary shelter care facility, as defined in Section 1530.8 of the Health and Safety Code, only when the court finds that placement is necessary to secure a complete and adequate evaluation, including placement planning and transition time. The placement period shall not exceed 60 days unless a case plan has been developed and the need for additional time is documented in the case plan and has been approved by a deputy director or director of the county child welfare department or an assistant chief probation officer or chief probation officer of the
county probation department.