In my view, it may be assumed that the hypothetical prospective purchaser of the reserved Mount Lawley land in May 1996 would have made enquiries which established the following facts:
(1) Some 75 ha of the land constituted wetlands which were protected under the Lakes EPP.
(2) It could be argued that the boundaries of the wetlands on plan 1815 had been mapped inaccurately in 1991, or had changed subsequently due to changes in the level of the water table. However, there would be little prospect of persuading the EPA to amend the Lakes EPP.
(3) Although the Lakes EPP did not prohibit development of wetlands, there was a presumption against it: and the EPA was likely to oppose development in this case, having regard to its view that the Lexia wetlands generally were of high conservation value. The EPA's view was arguable, but it was justifiable on the evidence: in particular, the unique combination on the Swan Coastal Plain of the size and pristine quality of the wetlands and their proximity to each other.
(4) The upland areas surrounding the wetland basins were well suited for urban development, being elevated and well drained.
(5) The vegetation on the upland areas was banksia woodland in very good condition.
(6) Large areas of woodland of that kind, containing the Heddle vegetation complexes to be found on the reserved Mount Lawley land were present in secure reserves elsewhere, but not in association with such a substantial group of wetlands in such pristine condition.
(7) There were no priority flora on the Mount Lawley land.
(8) The wetland areas provided a habitat for the Southern Brown Bandicoot, which was a protected species. This would not preclude development, but it would be necessary in any development to ensure that the habitat was preserved, and adequate corridors provided, to ensure free movement of the Bandicoots.
(9) It would be a requirement of any development that vegetation buffers be provided round the wetlands. Although the width of the buffers might be a matter for negotiation, the EPA's usual practice was to require the minimum width of 50 metres when wetlands were included in an urban development. This would involve some 50 ha of land.
(10) Other agencies - and CALM in particular - were more conservation inclined than the EPA, but only the EPA was empowered to prevent development, or to impose onerous conditions.
(11) Before any development could proceed, it would be necessary for a full environmental assessment to be carried out. This would enable all interested authorities, organisations and individuals to make submissions, which the EPA would take into account in considering its attitude to development.
(12) Subject to these matters (which amounted to a considerable qualification), some 195 ha of the Mount Lawley land would be suitable for development.