This post originally appeared on Orphan Road.
It’s almost here. What a project:
To create the level plateau on which to build the runway, the port brought in 13 million cubic yards of fill and relocated three million cubic yards of soil already on the site.
To hold that fill in place, the airport construction team created three huge retaining walls, the largest of which is 1,430 feet long and some 130 feet tall.
The gravel and the soil used to create that plateau had to pass forensic inspections to ensure it was clear of contaminants and similar in composition to the rocks and soil already at the site.
“We had to find gravel that originated in the same place in Canada and that was transported here by the glaciers as the gravel that was here on the site,” said King.
The reasoning behind such a requirement is that water that leached through the fill would pick up minute traces of the minerals in the fill, drain into the creeks and confuse or damage native salmon returning to those creeks.
The article also lists some pretty innovative improvements going on at the airport besides the 3rd runway, including a bird detection radar, the rental car terminal, and a new system that will pipe the terminal’s air conditioning to the planes waiting at the gate, so they don’t have to run their engines while they board.