WJ News

Latest News and Updates from WJ Groundwater and across the Industry.

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Sump Pit Completion at Caledonia Station

The Eglinton Crosstown represents the largest transit expansion in Canada. It will completely change how residents and visitors in Toronto get around this great city. 19 kilometres of new light rail – 10km underground – that starts in the west end and travels right through the city to the east end, with 25 new stations and stops linking to 54 bus routes, three subway stations and various GO transit lines. That means shorter commutes, reliable and convenient transit and cleaner air.

But that kind of huge infrastructure project doesn’t come without more than its fair share of challenges! This was exactly the case at the Caledonia Station site. The ground conditions we encountered there were among the most challenging we’ve had to deal with in WJ’s long and successful involvement with the Eglinton project. However, we were confident that given our decades of experience and industry-leading practices, we were up for the challenge!

Eglinton Crosstown Caledonia Station dewatering
Eglinton Crosstown Caledonia Station dewatering
Eglinton Crosstown Caledonia Station dewatering

Multiple clay layers ran through the site, cutting up the aquifer into many different pieces. Factor in a massive 30m deep excavation, shored by soldier pile and lagging, and we had all the ingredients for a dewatering nightmare.

After coming in to rescue project developers, CTS, from an inferior dewatering system that couldn’t tackle these site conditions, WJ got to work with Crosslinx to uncover these layers. Our expert water management consultants deciphered the geology of ancient glacial lake bottom deposits that lay buried deep underground across Toronto.

However, in the world of dewatering, clay is clay. No matter how thin, a continuous layer can quickly change dewatering requirements.

Our deductions were proved correct when we uncovered a 1-inch thick layer of clay across the entire site. Working tireless to dewater each and every layer, WJ battled the water towards the base of the sump pit. From there. our sump pit dewatering actions provided a site suitable for CTS to complete their excavation and commence construction of the station from the bottom-up.

Eglinton Crosstown Caledonia Station dewatering
Eglinton Crosstown Caledonia Station dewatering
Eglinton Crosstown Caledonia Station dewatering

“WJ helped the Caledonia team through some very challenging conditions at Caledonia. They were committed and worked with us every step of the way. WJ’s can-do attitude was refreshing and much appreciated on this difficult and challenging site.”

– Daniel Sanchez, Project Manager, Caledonia and Keelesdale Stations.

Eglinton Crosstown Caledonia Station dewatering
Eglinton Crosstown Caledonia Station dewatering
Eglinton Crosstown Caledonia Station dewatering
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WJ Group AdminSump Pit Completion at Caledonia Station
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The Royal Parks

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WJ Group AdminThe Royal Parks
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Library of Birmingham

Close neighbour to the Birmingham Rep, the Library of Birmingham opened in September 2013 replacing its predecessor Birmingham Central Library.

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WJ Group AdminLibrary of Birmingham
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University College London

Recognised as one of the leading multidisciplinary research universities in the world, UCL was founded in 1826 as London’s first university.

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WJ Group AdminUniversity College London