Except that is not quite true.  KM will be rerouting some of that pipeline as over time, development precludes easy access, especially in metro Vancouver.

You can find online maps with the existing pipeline and the proposed new pipeline, and you can clearly see that new right of ways will have to be secured, or land purchased.  Have a look at the proposed route through Burnaby, Coquitlam, New Westminster, and then south of the Fraser through Surrey and  Langley.