Soil and Groundwater Remediation

Remediation works of former gas plant site in Terken, Roubaix (France)

The former gas factory site in Roubaix is remediated and redeveloped into a recreation park. Envisan was responsible for all soil remediation works.

 

The former gas factory site in Roubaix is remediated and redeveloped into a recreation park. Envisan was responsible for all soil remediation works.

 

Key figures
Country

France

Client's name

Etablissement Public Foncier Nord-Pas de Calais

Contractor's role

Main Contractor

Period

07.2011 - 10.09.2012

Technical specs
Scope

Remediation and rehabilitation works at the former gas plant in the eco-quarter of Union at Roubaix et Tourcoing
The former gas factory site is remediated and redeveloped into a recreation park. Envisan was responsible for all soil remediation works.

Methodology

The remediation entailed the removal of all underground constructions (approx. 15,000 m²) and the removal of
the most heavily polluted soil around and below this area (approx. 20,000 m³). Ca. 27,300 tonnes of polluted soil was removed by waterway to a recognized treatment centre for thermal treatment.
The excavation was combined with a drainage system and a groundwater treatment system (10 m³/h).
After the excavation and decontamination works, the concerned areas were filled up using about 30,000 m³ of clean soil, of which approx. 10,000 m³ came from temporary storage. To protect the public road and the buildings on the neighbouring parcel against potential settlement damage, about 2,500 m² of sheet piles were installed.

Type of contaminants

Heavy metals, cyanides, organic compounds, PAH's, BTEX

Equipment

Excavator, bulldozer, piling equipment, groundwater treatment plant

Remediation of Carcoke site, Brussels (Belgium)

Carcoke is the name of a cokes factory that was operational in Zeebrugge. During that period English coal was converted into cokes for the steel industry. In 1975, this factory merged with the...

Carcoke is the name of a cokes factory that was operational in Zeebrugge. During that period English coal was converted into cokes for the steel industry. In 1975, this factory merged with the cokes factory of Marly in Brussels, which was in operation until January 1993. After the closing of both factories heavily polluted sites were left behind. It was a real challenge to remediate the dilapidated and polluted factory sites of 14 ha and 12 ha respectively and to transform them into clean, valuable sites. Envisan assisted for both sites in their complete remediation. On both sites, hundreds of thousands of m³ of polluted soil were excavated and treated. The heavily polluted groundwater is pumped up using various pumping systems and treated in complex, aboveground treatment plants.

 

Key figures
Country

Belgium

Client's name

Port of Brussels

Contractor's role

JV Partner (Part JDN: 66%)

Period

28.08.2007 - 08.2011 (Demolition works and Soil Remediation)
07.2011 - 07.2026 (Groundwater remediation)
02.05.2053 (concession)

Technical specs
Scope

Remediation of the Carcoke site (12 ha) - Design and Build
Excavation and treatment of 110,000 m³ contaminated soil (specific loading system into ships with long reach system over a public road in use)
Specific measurements (continuous PID measuring stations and biomonitoring)
Pilot Test Chemical Oxidation
In-situ remediation by means of multiphased extraction (134 filters) and groundwater extraction wells
Installation of biosparging-system
Treatment of groundwater and soil vapour during the next 15 years (10 m³/h: oil/water separator, automatic sand filtration, stripping tower, activated carbon filtration for water and air, ion exchange filtration, metal adsorption filtration)
Design and Build of a multifunctional logistic center
Exploitation of the logistic center
Modernizing existing quay
Diversion of existing road between project area and canal
Main infrastructure works on site
Sieving of soil and debris

Methodology

Demolition work
Excavation
Thermal treatment
Groundwater remediation (pump & treat, bioventing, chemical oxidation)

Volume

110,000 m³

Type of contaminants

PAH's, TPH, Tar, mineral oil, BTEX, heavy metals

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