(1) The fact that a port authority has a function given to it by section 30 does not impose a duty on it to do any particular thing and, subject to this Act and any direction given to the port authority by the Minister, it has a discretion as to how and when it performs the function.

(2) Nothing in this Act limits or otherwise affects the operation of the Environmental Protection Act 1986 in relation to a port, a port authority or port activities.