From and after October 18, 1991, in order to obtain approval to operate as a Class A facility at a site previously permitted to operate as a Class B facility, an applicant shall:
(1) File an application for a certificate of need with, and obtain approval from, the Public Service Commission in the manner specified in section one-c, article two, chapter twenty-four of this code, and in section thirteen, article fifteen, chapter twenty-two of this code; and
(2) File an application for a certificate of site approval with, and obtain approval from, the county or regional solid waste authority for the county or counties in which the facility is located or proposed. Such application shall be submitted on forms prescribed by the solid waste management board. The county or regional solid waste authority shall act on such application and either grant or deny it within thirty days after the application is determined by the county or regional solid waste authority to be filed in a completed manner.