Kilnwood Vale: 132ha landfill development in Crawley

At 132-hectares, this significant site is being redeveloped to provide a new community of 2,500 homes, a primary school, neighbourhood centre, retail space and elderly care facility.

CampbellReith has provided comprehensive engineering design advice to de-risk this 132ha site and provided a ‘development ready’ platform for a brand new community. In addition, CampbellReith has supervised the remedial earthworks and provided technical project management and project oversite.

Ground Risk Management supports project viability

CampbellReith has designed the ground treatment which incorporates ground investigation, land quality assessment, remediation, surcharge and reinforced earth retaining walls.

Civil engineering comprising earthworks modelling, road-drainage, railway bridge design and earth retaining systems design has also been undertaken by CampbellReith. This has facilitated the economic and sustainable development of a site that would otherwise be unsuitable considering its history and ground risks.

Materials Management Plan enabled 99% reuse of all soil

Site remediation incorporates the excavation, treatment and placement of over 1M cubic metres of landfill material which has then been surcharged to control consolidation, creep settlement and collapse compression. Remediation has provided a decontaminated site suitable for residential homes reusing 99% of all soil arisings via a Materials Management Plan. A highly sustainable development, minimising the consequential impacts of development on the surrounding environment has resulted.

Intelligent protection from gas migration

The remedial design has considered quantitative ground gas modelling and forensic site investigation with earthworks controls to appraise and control the level of ground gas generation. This facilitated development without the need for additional ‘land based’ ground gas protection measures.

Integrated design

The strategic road and drainage network has been delivered with an integrated design which considers residual ground settlement protection and controls to prevent ground gas migration. The drainage / SuDS includes two surface attenuation basins and the realignment of the existing surface water course (Bewbush Brook). The foul network design includes the provision of several pumping stations.

In conclusion

A challenging and exciting scheme for our engineers. Our team led the technical discussions, utilising our multi-disciplinary engineering specialists to form an agreed solution and a successful outcome for our Client. CampbellReith design services have been implemented in close working relationships with the client technical team, planning consultant, quantity surveyor, landscape architect and ecologist.

“The project was highly commended in the NCE 100 awards”