6 According to Mr Staples, of particular concern to RailCorp is the potential impact of the proposal on the Metrowest Rail Link site. The site is located on part of the land identified for the construction of an underground rail tunnel as part of the proposed Metrowest Rail Link. The land on which the buildings are proposed is the subject of planning controls that require the relevant consent authority for a DA to refer DAs in relation to the land to RailCorp for comment or concurrence. He outlines the relevant planning controls under cl 80 of the Sydney Local Environmental Plan 2005 ("the LEP") and its predecessor. Further cl 11 of SEPP 63 - Major Transport Projects provides:
(1) This clause applies to a development application for development on land within a Metropolitan Rail Expansion corridor that involves excavation, or other penetration of the ground, to a depth of 2 metres or more measured vertically from the best assessment of natural ground level.
(2) The consent authority must not grant consent to development to which any such development application applies unless it obtains the concurrence of RailCorp.
(3) In deciding whether to grant concurrence, RailCorp must take into consideration the likely effect of the development on:
(a) the practicability and cost of carrying out development for the purposes of the rail expansion project concerned on the land in the future, and
(b) without limiting paragraph (a), the structural integrity or safety of, or ability to operate, the project, and
(c) without limiting paragraph (a), the land acquisition costs and the cost of the construction, operation or maintenance of the project.