Bentofix® Capping for Urban Remediation Scheme

The 23 hectare West Marsh site in Grimsby was earmarked for redevelopment into a Country Park, flanked by mixed residential and retail/commercial zones. But, because of its historical landfill status, and inherent groundwater and ground gas issues, the site had to be decontaminated and sealed to enable its restoration. To achieve this, a proven long-term solution was required which would provide a flexible, self-sealing, low permeability gas and water barrier.

NAUE provided geosynthetic landfill sealing products and technical expertise for a challenging urban land reclamation project at West Marsh, close to the town centre of Grimsby, North East Lincolnshire.

NAUE provided geosynthetic landfill sealing products and technical expertise for a challenging urban land reclamation project at West Marsh, close to the town centre of Grimsby, North East Lincolnshire.

All Bentofix® products contain high-swelling, high-quality, powdered sodium bentonite and are manufactured with needle-punch and Thermal Lock (enhanced shear strength) technologies.

Bentofix® BFG 5000 was installed to secure 6.5 hectares of land on which the main recreational facilities would be constructed. Bentofix® BFG 5000 was specified because of its complete impregnation of bentonite in the non-woven geotextile, its self-sealing overlaps, which ensure a continuous barrier, and its independent BBA Certification for waterproofing and methane / radon barrier performance under confining pressure.

Bentofix® X2 NSP 4900 was chosen as the low permeability capping system on a further 16.5 hectares of the site. Bentofix®‘X’ include a gas-tight polymeric coating which provides a barrier against moisture and gases, and restricts the ingress of roots. The polymeric coating is extruded onto the GCL, so there is no risk of the critical polymer layer delaminating – an important contribution to the site’s environmental protection plan.

A further benefit of the polymeric coating is that it offers an immediate barrier prior to bentonite hydration and a mechanical resistance to shrinkage, which enabled restoration soil depths on the site to be reduced from the standard 1000mm to just 450mm.

NAUE’s strength in logistics and client communication also yielded savings, with the rolls of Bentofix® being delivered direct to site; complying with main contractor Bay Construct’s delivery schedule and specification. NAUE also provided quality assurance support, installation details, and subgrade cover soil compatibility testing –all of which helped the project works to unfold as planned, and within budget.

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