The Environment Protection Authority shall, as soon as practicable after receiving an application made in accordance with section 12, by order published in the Gazette--
(a) where the land described in the application comprises the whole of a recreation vehicle area--rescind the order under section 11 (1) relating to that land, or
(b) where the land described in the application comprises part of a recreation vehicle area--vary the order under section 11 (1) relating to that land by excluding from the operation of that order the land so described.