Where site plan approval is required elsewhere in this chapter for a development or activity, the site plan review shall include review of the adequacy, location, arrangement, size, design, and general site compatibility of proposed structures, including piers, docks, wharves, sea walls, boat lifts, boat hoists, boat ramps, and moorings. The Planning Board, during site plan review, may establish a minimum setback of greater than 30 feet from the ordinary high water line based on due consideration by the Board of the preservation and protection of sensitive environmental features, and the maintenance of the wooded character of the shoreline area (if applicable), as well as scenic views and vistas. Where a site plan exists, an approved modified site plan shall be required if any of the thresholds specified in § 270-191 of this chapter are met, including but not limited to proposed changes to or additions of piers, docks, wharves and similar structures where such changes or additions meet a § 270-191 threshold.