You need to do work on the easement other than the normal farming activities TGP has agreed to.
You notice poor easement conditions such as poor vegetation cover, subsidence or erosion.
Watercourse washouts or other unusual conditions arise which may pose a threat to the pipe and/or safety.
You are going to conduct farming activities over the pipe such as: ploughing or deep-ripping greater than 300mm.
You are planning nearby developments, such as: