What people don't know is that Westridge terminal is further east in Burnaby, not in Vancouver harbor. To get there, Afromax tankers have to navigate under 2 more bridges. Access is tight, the waterway is narrow and there is little to no room to maneuver and these tankers can only come in during 2 20 minute intervals every 24 hours when there is slack tide and tide is at its highest. Otherwise the tankers could run aground, that is how tight this is. The room for error goes up significantly in these circumstances. 

BC engineers have recommended Roberts Bank, south of Vancouver, as a superior alternative. There is enough space there, there is already a shipping harbor and Ferries there and there is deep water access for these tankers. It brings the level of risk down significantly. The pipeline can simply be run along the railway right of way that already goes there. It would cost Kinder Morgan 1.2 billion extra but they stand to gain billions.

Rachel Notley has said it is a good idea