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Docksway Landfill Site,
Newport, Wales, UK

Innovative solutions for complex environmental and geotechnical conditions

Peter Brett Associates LLP (PBA) has been providing engineering and environmental services to Newport City Council since 2001 on their Docksway Landfill. The site comprised a “dilute and disperse” municipal landfill which has now been restored and a new containment landfill constructed largely upon a former river meander.

We established baseline environmental data and built up evidence for risk assessments. Newport City Council (NCC) required two PPC permits to be prepared for different areas in the same time frame. This required up to 30 PBA staff working on the risk assessments and design. We worked with NCC to maintain regular progress meetings with the Environment Agency. This was essential for confidence building and providing an understanding for the regulator of the complex environmental and geotechnical conditions of the site. The transfer of knowledge to the regulator enabled a relatively quick issue of the PPC permit in 2005. Since that date, we have provided design and support to the client on many aspects including fulfilling the condition requirements and modifications to the permit.

We devised a novel application of soil strengthening using cement columns to transform the “porridge like” alluvium into a surface on which the containment layer could be constructed.

We continue to provide quality assurance of construction and contract management support.

 

Additional images

Did you know?

We devised a novel application of soil strengthening using cement columns to transform unstable alluvium into a surface on which the containment layer could be constructed. This is significantly extending the landfill site’s life.

Services provided

  • Construction management support
  • Landfill design
  • Environmental monitoring and reporting
  • Geotechnical / hydrogeology
  • Construction Quality Assurance (CQA) and PPC permit application
  • Risk assessments for stability, hydrogeology , hydrology and landfill gas

Project highlights

  • Restoration of a landfill
  • Novel application of soil strengthening and ground stabilisation