Complete applications. The Land Use Board shall, within the sixty-day time frame, approve all complete applications for co-location, removal, or replacement of equipment at an existing wireless communications tower or base station that do not constitute a substantial change and that do not otherwise violate applicable health, safety, and other requirements set forth in this section. If the Land Use Board determines that an application constitutes a substantial change to an existing wireless communications tower or base station, or otherwise fails to comply with this section, it shall notify the applicant of same in writing. If applicable, the Land Use Board shall advise the applicant to initiate the site plan process required by this section.