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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Case Studies

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Burgess Hill, Sewage Treatment Works and Landfill

Demolition, landfill remediation, bioremediation, water treatment, earthworks, soil stabilisation, ecological management.

The former sewage treatment works was demolished and, together with a former landfill on the site,  remediated to make way for 325 residential dwellings, a community hall and new roads and infrastructure.  Since closure in 2005, the...

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Bushey Water Treatment Works

Earthworks, demolition, segregation, groundwater treatment, chemical oxidation, backfill and compaction, stabilisation, Japanese knotweed treatment.

The former Veolia Water Central Ltd offices and water treatment works at Three Valleys Way was to be redeveloped for housing.  The site covers an area of approximately 4.2 hectares and required excavation, remediation and soil improvement...

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Camden, Asham Plaiting Works

Earthworks, site investigations, segregation, chemical testing, reinstatement landscaping and groundworks.

The former Ascham Street works were originally identified by The London Borough of Camden under its duty under Part 2A of the Environmental Protection Act 1990 for investigation as potentially contaminated land...

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Cannon Wharf, Surrey Quays

Groundwater treatment, bioremediation, stabilisation, chemical oxidation, groundworks.

The former industrial site was remediated so that it could be further developed for mixed commercial and residential development. Cannon Wharf had a long history of industrial development since 1834, leaving the site contaminated with heavy tar...

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Canterbury, Rhodaus Town

Groundwater treatment, demolition, tank and contamination hot spot removal, bioremediation, chemical oxidation, earthworks, stabilisation.

The 1.2 hectare site in Rhodaus Town, Canterbury, comprised a former car dealership with showroom and workshops and a decommissioned Total petrol filling station (PFS). The site was known to have supported various garages, alongside a previous...

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Castle Mill, Oxford

In-situ stabilisation, excavation, geotechnical testing.

The 1.5 hectare site was previously occupied by railway sidings and was redeveloped with the construction of eight student accommodation blocks each between six and eight storeys. The buildings were to be constructed using piled foundation but...

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Cranleigh, Swallow Tiles

Demolition, asbestos screening, contamination hot spot removal, earthworks, stabilisation.

Cognition carried out extensive remediation works at a former brickworks to treat and process soil contaminated with asbestos. The 24.2 hectare site, located on the outskirts of the town of Cranleigh, Surrey, comprised woodland to the south and...

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Crowmarsh Gifford, Lister Wilder

Demolition, bioremediation, soil processing and production, stabilisation, Japanese knotweed treatment and disposal, archeological support.

Cognition remediated an agricultural machinery yard in Crowmarsh, Oxfordshire which is to be redeveloped for residential housing. Large areas of the yard was built over foundry sand and clinker deposited on the site to raise the land and...

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Greenwich, Enderby Wharf

Demolition and tank removal, Contamination hotspot removal, bioremediation, water treatment, earthworks, soil stabilisation.

Barratt Homes redeveloped the site with the construction of eight apartment blocks. Originally four of the blocks were to be located over a large basement to be used for car parking constructed within a secant pile wall. The north west area of...

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Godalming, Key Site

Site investigations, demolition, dewatering and groundwater treatment including NAPL removal, bioremediation, stabilisation, chemical oxidation.

The former gasworks was remediated and excavated in order to make way for a new residential development. The site was formerly occupied by a gas works between 1871 and 1970, which resulted in the contamination of the site soils and groundwater....

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Goodluck Hope, Leamouth

Demolition, site Investigation, bioremediation, materials management and basement excavation, groundwater treatment including NAPL removal, stabilisation.

Dealing with a very large mixed residential and commercial use building development in the UK, Cognition had to ensure their remediation strategy was both cost-effective and sustainable. Cognition’s site Investigations identified...

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Great Blakenham

Chemical oxidation, groundwater treatment.

Cognition was contracted by a housing developer to propose a remediation strategy for the contaminated groundwater at a former cement works and petroleum supply depot in Great Blakenham, Suffolk. The site was operational between the...

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Great Shelford, Welch's Yard

Demolition and underground tank removal, asbestos removal, bioremediation, water treatment, earthworks, soil stabilisation.

Croudace Homes contracted Cognition to carry out remediation works on three sites in close proximity to each other in Great Shelford, the sites originally occupied by a petrol station, car parking and a transport/haulage company. The sites were...

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Harwell, LETP

Demolition, segregation and excavation, sludge processing, radioactive assay, dust suppression, environmental monitoring

The Liquid Effluent Treatment Plant (LETP) served 14 nuclear reactors from the main Harwell site. All reactors are no longer in service with all but three successfully decommissioned. The site is contaminated with a mix of low and very low...

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Hawkenbury Farm, Kent

Excavation and processing of landfill waste, hotspot removal, bioremediation, stabilisation, dynamic compaction, groundwater treatment, clay cut-off wall and permeable reactive barrier installation.

A former landfill dating from the 1930s-1960s covered the northern third of the site, occupying former clay pits mined in the early 20th century. The made ground within the landfill contained extraneous waste items such as ceramic, glass,...

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Hinkley Point 'A' Power Station

Bioremediation, stabilisation, NAPL removal, groundwater treatment, chemical oxidation, demolition, groundworks, radiological monitoring.

Hinkley Point ‘A’ Site is currently being decommissioned by Magnox. Diesel contamination was discovered in soil and groundwater during site investigations in an area known as an Area of Potential Concern, APC-9. The pollution was...

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Horley, Sewage Works

Demolition, bioremediation, stabilisation/encapsulation, ecological management.

Cognition was contracted by Wates to remediate a former industrial site in Whitmore Way Horley for a residential development. The site was occupied by the sewage treatment works and garages. Landfilling of pulverised waste had also taken place...

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Hunterston 'A' Nuclear Power

Cut-off/barrier wall, nuclear waste segregation, stabilisation/encapsulation.

An historic leaking active effluent drain on the site resulted in a sub-surface plume of radiological contamination. Also running through the area was a network of land drains that essentially acted as a pathway for mobilising Caesium137...

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Kingston Gas Works

Bioremediation, segregation, groundwater treatment, chemical oxidation, stabilisation, demolition.

The former gasworks was remediated to prepare the site for residential redevelopment.  Three large gas holders, together with associated infrastructure and small buildings, were present on site at the outset of the works. A number of...

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Kent, Former Landfill

Excavation and processing of landfill waste, hotspot removal, bioremediation, stabilisation, dynamic compaction, groundwater treatment, clay cut-off wall and permeable reactive barrier installation.

A former landfill dating from the 1930s-1960s covered the northern third of the site. Landfill contained extraneous waste items such as ceramic, glass, brick, wood, metal and fabric. The soil was also contaminated with hydrocarbons which were...

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Meridian Water, Wiloughby Lane

Fabric extraction, of LNAPL and DNAPL, bioremediation, stabilisation, earthworks, groundwater treatment, site investigation, vacuum excavation.

The 8 hectare former gasworks site at Willoughby Lane had been operational for over 100 years resulting in several distinct sources of contamination, notably; arsenic, cyanide, hydrocarbons, VOC’s and PAH’s in the soils and Dense...

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Mill Hill, London

Demolition, waste segregation and treatment, bioremediation, stabIlisation, groundwater treatment, asbestos removal, groundworks.

The site was formally occupied by the National Institute of Medical Research and previously by laboratories and research buildings dating back to the 1920s. A number of chemical stores, plant rooms and waste pits have been identified from plans...

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Newbury Gas Works

Demolition, bioremediation, chemical oxidation, stabilisation/solidification, permeable reactive barrier and clay cut-off wall installation, fabric extraction system to remove NAPL.

Newbury Gasworks site, within the Sterling Industrial Estate, has had a long history of industrial use leaving a heavily contaminated site within a built up area of Newbury surrounded by residential and commercial properties. Stringent...

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Newbury Gas Works

Design & Build of S278 / S38 Works, CFA Piling, Groundworks and Concrete Frame.

Newbury Gasworks site, within the Sterling Industrial Estate, had a long history of industrial use leaving a heavily contaminated site within a built up area of Newbury surrounded by residential and commercial properties. Cognition Land and...

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Nine Elms Gas Works

Ex-situ bioremediation, screening and segregation, groundwater treatment, stabilisation.

The former gas works was remediated in order to make it suitable for future redevelopment. The site in Nine Elms, London borough of Wandsworth, is approximately 60m south of the Thames and covers about 5.4ha. It is bounded to the north by Nine...

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Croydon, New South Quarter

Demolition, ex-situ bioremediation, water treatment, chemical oxidation.

The 5.3-hectare New South Quarter site in Croydon housed a former gasworks and required remediation prior to redevelopment for housing.  Soils were contaminated with light aromatic organics, specifically BTEX compounds (Benzene, Toluene,...

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O2 Arena Coach Park Greenwich

Demolition, enabling works, groundworks, earthworks, watching brief, ground improvement, services relocation, drainage, road and pavement construction, street furniture, CCTV and technology installation, retaining wall construction.

The construction of the rotation chamber for the Silvertown Tunnel and the consequential diversion of Millennium Way will result in the loss of car parking space for the O2 Arena.  This will be replaced by the construction of a...

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Isle of Sheppey, Former Steel Mill

Demolition, groundwater treatment, proof digging, watching brief, geotechnical improvement works, band drain (PVD Prefabricated Vertical Drains) installation, reptile translocation and vegetation clearance.

The purpose of the works carried out by Cognition was to facilitate regeneration of the area and the residential led development.  We completed additional ground investigation and finalised the remediation strategy and detailed...

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Royal Wharf, Silvertown

Demolition, bioremediation, groundwater treatment, permeable reactive barrier, stabilisation.

Dealing with one of the largest mixed residential and commercial use building developments in the UK, Cognition had to ensure that their remediation strategy was both cost-effective and sustainable. Extensive Site Investigations identified...

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Guildford, Slyfield Regeneration

Excavation, waste segregation and treatment, water treatment, dynamic compaction, stabilisation, deep drainage, road construction curbs, beany blocks, surfacing, street lighting.

The site was located on the periphery of an industrial estate and encompassed former sludge lagoons used by Guildford sewage treatment works. Gravel abstraction had been carried out on the site since the 1960s and was subsequently used as a...

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Enfield, Sony

In-situ chemical oxidation, groundwater treatment.

The Sony warehouse was destroyed by fire and the client wished to rebuild the warehouse on the same footprint. The site is located on a secondary aquifer (Kempton Park Gravel) overlaying London Clay. Groundwater was encountered between 1.78m...

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Southall, Western Access Road

Bioremediation, mechanical segregation, dynamic compaction, stabilisation.

Cognition Land and Water was contracted by FM Conway Limited  to undertake remediation and earthworks for the redevelopment of the former Southall Gasworks. The site was surrounded by watercourses with a central tip area containing...

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Southall

Fabric extraction of DNAPL.

This site has been utilised for industrial activities for over 150 years, which have included brickworks, oil works, coal and oil gas manufacture, chemical works, benzole and tar manufacturing, docks and natural gas storage resulting in several...

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Steetley Chemicals, Worksop

Bioremediation, groundwater treatment, mechanical segregation of extraneous waste/asbestos, stabilisation/encapsulation, chemical oxidation.

The 85 hectare site was previously occupied by a refractory brick works, quarry, colliery, various small industries and a 25,000m3 waste tip. This was remediated so that the site would be suitable for future redevelopment. The principle...

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Tipner, Portsmouth

Bioremediation, segregation, groundwater treatment, soil washing, stabilisation, chemical oxidation, PRB.

The 1.7 hectare former PD Fuels Depot at Tipner formed part of the 44 hectare Tipner Regeneration Project that would transform the geographical area and provide a new gateway to Portsmouth. The site was located in a sensitive busy residential...

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Wandsworth, London

Demolition, waste segregation and treatment, bioremediation of grossly impacted contamination, NAPL recovery from groundwater, soil stabilisation, groundworks.

The site was occupied by a former gasworks from as early as 1868. The gasworks developed with additional infrastructure including tanks, cranes, retort house and chemical works added over the years to the 1950s until its eventual closure in the...

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Wisbech, Nene Waterfront

Bioremediation, stabilisation, groundwater treatment, chemical oxidation.

Cognition was contracted by Fenland District Council to remediate the Wisbech site in order to reduce environmental and human health risk as to enable redevelopment to facilitate the regeneration of this area. The remediation was partly funded...

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Kodak, Harrow

Demolition, site Investigation, bioremediation, materials management, groundwater treatment and soil stabilisation.

Cognition was appointed to carry out the remediation works at the former Kodak Factory in Harrow. The site is to be redeveloped by Barratt Homes with the construction of a number of residential blocks and associated landscaping and roads. ...

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