I have an 8" gas pipeline running from north to south on my ranch...it was explained to me that in my instance the gas company has access to repair or replace the line as need be. The line is old as the right-a-way has completely grown up with small trees and bushes. The gas company did do a line survey with marker flags a couple of years ago but that's all that they have done to date. The line is exposed where it crosses a gully and I've put my ear to it and can't hear gas moving through it so it may not active.