If any agency or board specified in Section 45019 receives a complaint concerning a solid waste facility or disposal site that the agency or board does not refer to another state agency pursuant to Section 45021, or if the agency or board receives this complaint referred to it by another agency or board pursuant to Section 45021, the agency or board shall either take appropriate enforcement action concerning the facility or site pursuant to this part, or refer the complaint to the Attorney General, the district attorney, the city attorney, or the county counsel, whichever is applicable, or, at the earliest feasible date, not to exceed 60 days, provide the person who filed the complaint with a written statement explaining why an enforcement action would not be appropriate.