Best Massey Crossing for Richmond/Delta

Take part in the Massey Crossing Feedback before 4 pm on Wed., Feb. 26, 2020 (deadline). Here’s informed input for Richmond/Delta benefits.

_______________

In brief:

The 8-lane tunnel expansion is the best viable option for Richmond/Delta environmental benefits and congestion. (Adding more than 6 traffic/transit lanes will tend to increase congestion in Richmond, but the 6-lane alternative seems to have little chance.)

A fixable shortcoming of the current plan is that it under-uses the Legacy Tube (existing tunnel). It also shortchanges sustainable modes of transport. That mostly means active transport such as cycling, walking and rolling, which are traditionally self-powered. They are increasingly motor-assisted. Metro Vancouver has lagged behind the trend but will catch up. Richmond/Delta can easily be at the leading edge of increased active transport and the range of sustainable modes of transport. At low cost, Richmond and Delta could get many significant benefits.

This article, written primarily from a Richmond/Delta perspective, features active transport (and sustainable modes) in the context of other important considerations for Massey Crossing decisions, wth particular attention to aspects that most people are not aware of.

______________

One consistently stated intent of BC’s George Massey Crossing Project Team is to retain the Legacy Tube (existing tunnel) as a utility corridor, at least for the electric-power transmission line—and that matters. But the Legacy Tube can also serve other valuable uses throughout the life of the expanded tunnel.

A preventive purpose is to block the 2-metres-deeper dredging of the Fraser ship channel that the Vancouver Fraser Port Authority (VFPA) has long wanted. That matters very much.

Note: Instead of being semi-cloaked, as it has usually been its dredging intents, VFPA has been overtly withdrawn its deep-dredging concept. No doubt that is because deeper dredging would hinder approval of Roberts Bank Terminal 2. The intended dredging would add to the “cumulative effects” of RBT2 and other factors that threaten the ecological health of the estuary.) But it’s a safe bet that VFPA will revisit the dredging when the RBT2 factor allows.

Like RBT2, the dredging would be ecologically disastrous for the Fraser Estuary.

Another note: Unlike the Legacy Tube, which is 22 feet deep, the planned 8-lane new tube(s), at 29.5 feet deep, would not block VFPA from dredging 2 metres deeper.

There are also at least two promising options for safe-transport use of the Legacy Tube:

  • If Cascadia high speed rail goes ahead, crossing the Fraser through the Legacy Tube route would be positive for Climate Action, as the minimal extent of construction would minimize GHG emission.
  • The Legacy Tube could enable a major boost for sustainable modes of transport. It has enough total width for (a) increased motor-assisted bicycles, scooters, etc., and (b) increased self-powered transport—walking, cycling, etc. It would connect with
    user-friendly routes, including the Shell Trail system and Delta equivalents.

A related factor that decision-makers would need to collegially deal with is the Project Team’s comments about saving the cost of bringing the Legacy Tube to current seismic standards. That very important goal seems manageable in the context of the Cowdell Report, which states:

[The Tunnel Replacement Project] did not consider that [ground improvement] provided for a new tunnel adjacent to the Tunnel could potentially be designed to also improve the seismic performance of the Tunnel. This idea is supported by the Tunnel Expert Panel and by the analysis completed for this Review. (p. 80)

As the project team has shown, (a) the new tube(s) will be on the upriver (east) side of the Legacy Tube, perhaps with a cutoff wall between, so ground improvement protecting the new tube(s) would also protect the Legacy Tube. (b) Downriver, on the west side, the only place for  ground improvement is directly west of the Legacy Tube. Therefore new-tube ground improvement would dissipate seismic waves from either side before they reach the Legacy Tube. And it could save money to revive the Legacy Tube.

Reminder: Send feedback to the Massey Crossing project by 4 pm on Wednesday, February 26, 2020.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s