There shall be written policies and procedures governing the rehabilitation service unit, including all of the requirements of Section 73489 and the relating of these services to other patient care services. The patient care policy committee shall be responsible for the development and implementation of the rehabilitation service policies, procedures and job descriptions with the assistance of the director of the rehabilitation services unit, the registered nurse, the physical therapist, the occupational therapist, the speech pathologist and/or audiologist and the social worker.