Monitoring Archives

Dewatering and Groundwater Treatment

Dan Carpenter October 27, 2023

Residential Dewatering and Treatment

Whilst much of WJ Canada’s work has been on transport and infrastructure projects, we are equally at home providing groundwater control services on residential projects.

Complex Conditions

For this project WJ were engaged to provide an upgrade of an existing dewatering system to meeting unexpected groundwater conditions on site, and to ensure the works could take place successfully. When WJ were brought on board we were immediately met with a complex geology consisting of distinct aquifers and water flow conditions. Thick, highly permeable, sandy aquifers were present, with low permeability peat layers on the east side of the site.

Dewatering and Treatment

WJ’s flexible dewatering solution was successfully implemented to accommodate the varying groundwater conditions by reducing the natural groundwater levels by 10m in a 13m deep excavation.

In addition to the dewatering system, a water treatment system was also upgraded to accommodate the high flows of around 1,000,000.00 l/day, as well as treating the water so they iron rich water (100mg/l) were clear by the time they had passed through the various media filters and bag vessels (which included automatic backwash operations), without interrupting the onsite dewatering works.

…and monitoring

A remote monitoring system covering all dewatering and water treatment system components and including water level sensors were also installed within the scope of this project. Thus, all the details of dewatering and water treatment works happening on site were instantly visible and traceable.

WJ wellpoint installation at UOIT September 2019

LRT Extension Project in Toronto

Dan Carpenter October 27, 2023

WJ keep Toronto Moving

The expansion of the Toronto Light Rail Transit (LRT) network has provided WJ with a steady stream of work since WJ Canada was formed in 2016, work which continues to this day.

Throughout 2022 WJ undertook a variety of pumping tests and other hydrogeological investigations at a number of key sites along the LRT alignment. Alongside these investigatory works, WJ have provided robust dewatering solutions to maximize the drawdown at the Tunnel Boring Machine (TBM) intervention sites.

TBM Interventions

These interventions are locations along the alignment where maintenance is performed on the cutting face of the TBM, and therefore, for safety reasons, zero hydrostatic pressure is required. This requites an extensive and robust dewatering system – something WJ are experts in providing.

In addition to investigatory and dewatering works, an extensive array of groundwater monitoring wells was installed along the alignment to be used for pre-commissioning testing and system monitoring.

LOCATION: Toronto

Provost Driver Court, Renfrew

Dan Carpenter October 9, 2017

This contract took WJ to Renfrew, in the suburbs of Glasgow, not far from our Scottish Office in the Scottish capital, to help contribute to an award winning project.

Royal Hospital For Sick Children, Edinburgh

Dan Carpenter October 9, 2017

The Royal Hospital for Sick Children has been based on it’s existing site in the heart of Edinburgh since 1895, however in 2005 it was decided by the local NHS Trust that a more modern facility should be constructed adjacent to the existing Edinburgh Royal Infirmary at Little France on the south-east edge of the city.

Brighton I360

WJ Group Admin August 24, 2015

In 2000, when the London Eye opened to huge critical acclaim and quickly became the UK’s most visited paid-for visitor attraction, countless cities wanted an ‘Eye’ of their own but found that a similar wheel design would not be financially viable without a suitable site or sufficient guaranteed visitor numbers.

New London Embassy

WJ Group Admin August 17, 2015

London’s biggest regeneration project received a crucial boost when plans for a new £620 million US embassy in Vauxhall got the green light in 2012.