Quote:
Originally Posted by s211
OK, I'm going to bet that for seismic reasons this can't be done in our region, but this is insane: instead of remediating a hot site, build a few hundred feet below the surface ?!?!?!?!? It's not as if there's a land shortage in the greater Chicago region, as far as I'd know.
https://theinvertchicago.com/
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There aren't too many 'hot sites' left in Greater Vancouver to deal with. The ones we had have mostly been successfully remediated, or capped and reused (mostly as parks). The seismic issue would make it difficult, but our geology would make it impossible. While there's a huge area of limestone on Vancouver Island (and on Texada Island) the glacial materials here wouldn't work in the same way. That's why tunnelling for transit isn't easy.
Developers could dig big holes to put industry underground, but it's not obvious what the advantage would be, here. We usually stick the parking underneath, unless the ground conditions don't work to even allow that. Having said that, it's exactly what BC Hydro are going to do under Nelson Park - but the new substation that will be buried there will still have a big pit dug out, not a tunelled chamber like the Chicago example, which just seems to be a workaround to avoid having to clean up the old steelworks and the contamination. I'm not clear how they avoid contaminated runoff seeping into the lower levels of limestone in that example.