In 2020, Cognition teamed up with Climate Care to offset our total annual emissions and becoming Carbon Neutral for the first time. In the same year, the company committed to stay proactive, adopting and developing more sustainable remediation methodologies, selection of materials and energy sources we use, reducing the need for offset element of our emissions. Our long-term goal is to continue improving efficiency and minimise emissions from our routine site and office operations across the board.
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Kingston Gasworks

7 March 2016

Cognition was contracted to carry out remediation works at Kingston Gasworks, prior to the construction of luxury residential apartments and a large basement car park. The soils and groundwater were considerably contaminated and an invasive species of plant was also present on site. Cognition was approached at an early stage of development and reviewed the strategy to ensure the remediation programme was cost effective and sustainable.

Cognition was contracted to carry out remediation works at Kingston Gasworks, prior to the construction of luxury residential apartments and a large basement car park. The site contained three large gas holders, together with associated infrastructure and small buildings. The soils and groundwater were contaminated with hydrocarbons, heavy metals and cyanide. Japanese Knotweed (an invasive, non-native plant) was also present. Cognition was approached at an early stage of development and reviewed the strategy to ensure the remediation approach was cost effective and sustainable.

Cognition carried out demolition of the former gas holders and the installation of deep and shallow sheet piles, to temporarily cut off groundwater and enable excavation for the basement. Cognition also dug out and disposed of soils impacted by Japanese Knotweed. Groundwater was pumped into a treatment plant and the treated water discharged to the sewer under a permit from Thames Water. Cognition developed a materials management plan which enabled contaminated soils to remain on site (encapsulated within clay beneath the basement), thereby substantially minimising disposal costs. Cognition also stabilised site-won soils for the formation of piling mats.

kingston-gasworks-1.jpg Overview of Kingston Gasworks site kingston-gasworks-2.jpg Water Treatment Plant comprising an oil water separator, sand filter and activated carbon vessel kingston-gasworks-3.jpg Site overview showing two of the former gas holders kingston-gasworks-4.jpg Demolition of former gas holder
small transparent gif for site construction purposes