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nfitz said:
It's different geology at Laird. The issue is was at Bayview - Leaside station, not at Laird station.

You can see a typical Leaside borehole log at https://files.ontario.ca/moe_mapping/downloads/2Water/Wells_pdfs/727/7278792.pdf - as you can see from 30 feet to 60 feet is sand, with sandy clay/silt on top, and clay underneath.

But at Laird (https://files.ontario.ca/moe_mapping/downloads/2Water/Wells_pdfs/726/7263118.pdf) there's silt in the matrix all the way to the bottom, at 80 feet.

I think the log I did in the 1990s said "flowing sands" - but it was a long time ago - and before drillers had to submit their own (typically under-described) logs to the Ministry.
Laird Station
View attachment 667333


Leaside Station
View attachment 667334
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I found an article about Leaside's construction here
Leaside station box was dug down to 22 metres or 72 feet. The pilings for the station are even deeper. Some down to 27 metres and others down to as much as 50 metres. So I highly doubt anything in the area is sinking
 
Same problems happened with Keele Station and High Park Station of Line 2. There are underground creeks in the neighbourhood of those stations. Keele School had to be rebuilt because of the rather loose soil

1753123796115.png

(High Park should have continued north of Bloor Street following those now buried ravines.)
 
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Metroscapes said:
Bayview / Eg is the site of the former path of Walmsley Brook. It survives south of the CPKC tracks near the future Ontario Line MSF, and its headwaters are historically by Duplex and Montgomery.
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Excellent work!

I've always wondered what happened if you managed to inadvertently dam across the more conductive sands and gravels where an old creek was, with foundations and caisson walls.

It wouldn't be the soils themselves that are the issue, but the groundwater rising higher than it used to in places, trying to find a new path. It shouldn't really be a problem other than leakage, unless they were somehow washing away all the fines - and that would take years. I've got a story to tell one day of a building on a different Toronto former creek, but it will have to wait a decade or two for the legal stuff to stop flying.

jordanmkasla2009 said:
Leaside station box was dug down to 22 metres or 72 feet. The pilings for the station are even deeper. Some down to 27 metres and others down to as much as 50 metres. So I highly doubt anything in the area is sinking
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Gosh, that is deep! And presumably designed that way because of the unusual sands we've been discussing.
 
Metroscapes said:
Bayview / Eg is the site of the former path of Walmsley Brook. It survives south of the CPKC tracks near the future Ontario Line MSF, and its headwaters are historically by Duplex and Montgomery. I traced its route in 2018.

View attachment 667702

I should also quote back to this:
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Thanks for this excellent work, I've always wondered where the creek ran, as I presumed it would be north to south. Since it does come out as a creek past the railroad tracks, I have to presume there is still running water underground. In the 1970s, when construction projects were probably not as well researched before they started, building sites downtown kept "rediscovering" Taddle Creek, forcing a change in plans after holes had already been dug!
 
A 6264 said:
Thanks for this excellent work, I've always wondered where the creek ran, as I presumed it would be north to south. Since it does come out as a creek past the railroad tracks, I have to presume there is still running water underground. In the 1970s, when construction projects were probably not as well researched before they started, building sites downtown kept "rediscovering" Taddle Creek, forcing a change in plans after holes had already been dug!
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Creeks, in fact all sources of water, meander.

No directional sense at all but most eventually end in Lake Ontario.
 
We’ve been interested in it for years.

A friend of my family used to live on south side of Roehampton, pre-war and she and her brother skated on a ‘frog pond’ across the road.

Turned out they skated where Fairfield now is located.

At some point, the city or a developer drained that part of Walmsley Brook and built homes where the kids skated.

Then when McDonalds had major problems at the south east corner of Bayview and Eglinton it just added to our curiosity.

It had to be related and due to the hidden rivers as they were then known.

Thank you for putting it together so well Metroscapes.
 
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A 6264 said:
I've looked for a rumour of tracks sinking at Bayview Station (or Leaside Station, which is what it will be called on line 5; I'm not sure which station we're even talking about), and can't find anything. Maybe it's time to ask for a source. Not that I don't think it's possible; the intersection (on Eglinton) is on a former or covered-over river bed.
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I'm a little doubtful of this whole rumour...but maybe engineers missed something? Yes, this station sits in an old creekbed, and this area was once near the shoreline of Lake Algonquin, the proto-lake to Lake Ontario.
 
Metroscapes said:
Bayview / Eg is the site of the former path of Walmsley Brook. It survives south of the CPKC tracks near the future Ontario Line MSF, and its headwaters are historically by Duplex and Montgomery. I traced its route in 2018.

View attachment 667702

I should also quote back to this:
Click to expand...
You explained this much better. I did some research work involving Walmsley two years ago, and was studying the impacts of Metrolinx construction on the remaining natural watercourse by Thorncliffe Park.
 
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