CBL case studies

CBL is 100% focused on meeting its clients briefs on time and to budget with sustainability at its heart.

case study: oxton nottinghamshire

Working with Veolia Plc and Nottingham County Council to deliver a new energy-efficient composting facility for use by the Nottinghamshire community.

Contract Value: £2m
Contract Duration: 30 weeks
Client: Veolia/PNR
Role: Principal Contractor (Project Management)


Our client operates the Nottingham County Council’s green waste composting facility. The green waste material (non-food waste) is turned into a fertile compost that is used by farmers, garden centres and households. The existing facility was at capacity and required modernisation.


Our brief was to upgrade the facility to a modern, high tech and energy-efficient plant under a design and build contract. The project required close liaison with the Dutch company WTT who supplied the aeration equipment and technology.


Taking green waste out of the landfill disposal stream has a huge benefit to the local population and environment alike. Recycling in this way also reduces the strain on local and world habitats, greenhouse gas emissions and chemical interventions that can adversely affect watercourses and biodiversity. As a sustainability-focused business, we designed into the construction process ways of reducing our impact on the environment and future maintenance.

Measures taken included;

  • Using gas and solar power for our temporary accommodation power needs
  • Recycling all the excavated materials to eliminate the need for landfill and associated transportation
  • Batching 90% of the required concrete at the site to reduce road congestion and emissions. The batching was part of overall energy and time-efficient concrete laying strategy using alternative and fast concrete laying technologies
  • Earthworks and landscaping with indigenous hedges
  • Access roads and operational yards
  • Structures and drainage
  • Operational accommodation
  • Composting installations and associated equipment

Working with Veolia and Gasrec to convert existing household refuse collection vehicles from diesel to compressed natural gas to reduce levels of harmful emissions.

Contract Value: £250k
Contract Duration: 12 weeks (phased)
Client: Veolia/Gasrec/PNR
Role: Project Management


Converting waste collection vehicles from diesel fuel to Compressed Natural Gas (CNG) as part of our client, and the London Mayor’s, drive to reduce harmful vehicle emissions in and around London, England.


We were appointed to design and build the CNG refuelling stations infrastructure and facilitate the equipment installation.


Converting vehicles from diesel to less polluting fuels such as CNG improves the public and workers’ air quality and is proven to reduce early deaths. The construction process was developed through design to minimise its environmental impacts by minimising excavations, off-site disposal and utilising recycled materials.

  • Client/Authority liaison
  • Design
  • Infrastructure build
  • Power modifications and upgrades
  • CNG plant attendances and security

Working with Golder Associates to remove an environmental hazard of a below ground industrial oil spill.

Contract Value: €300k
Contract Duration: 12 weeks
Client: Eaton Corporation Plc/Golder Associates/PNR

Role: Principal Contractor (Project Management)


This old engineering facility had been empty for some time. Our client was required to carry out an environmental audit that established a historic oil spill. The oil was found below ground and floating on a non-aquifer watercourse.


We were appointed to carry out the civil works involved in installing a cleverly designed pump and treatment process. The traditional excavate and landfill option would have cost in excess of €700k and had a significant impact on the local environment.


Industry must address historical practices that harm the local environment, and affect future generations and habitat alike. This treatment process was a smart way of minimising the disturbance of existing land and building surfaces and could be likened to keyhole surgery. The innovative design reduced the civil engineering infrastructure requirements, energy usage, emissions, transportation, and landfill need by siphoning off the underlying oils that could then be recycled and put back to use in the local economy.

  • Excavation of pipe trenches
  • Installation of oil/water separations equipment
  • Installation of micro-pumps below ground
  • Reinstatement and landscaping using salvaged materials

Working with Rentokil, Liverpool County Council and the Environment Agency to transform a heavily contaminated and disused industrial site into a safe and clean environment for redevelopment.

Contract Value: £1.1m
Contract Duration: 45 weeks
Rentokil Initial/PNR

Role: Project Management


Bradman road was a disused industrial site that had produced wood preservatives. The manufacturing processes had contaminated the groundwater and soil with various hazardous chemical contaminates; chemicals included chromium, cadmium, arsenic and fuel oils. Also, the old industrial and office buildings contained extensive fibrous asbestos.


Our client’s instructions were to investigate and profile-map the areas of contamination, review with various government authorities, agree on a clean-up strategy and to undertake the necessary works for the sale of the property.


We reviewed the brief from the perspective of meeting statutory requirements, protecting future site users, keeping the workforce safe and minimising the carbon footprint and expenditure of the remediation process for future redevelopments.


A comprehensive, Environment Agency-approved risk analysis of the site and the works were phased as follows:

  • Asbestos strip of all structures before demolition of all existing buildings and slab breakout
  • Salvaging all reusable and recyclable materials to minimise landfill, transport and costs
  • Minimising landfill requirements and off site disposal
  • Sealing of all redundant internal drainage works and removing underground storage tanks
  • Identification and removal of contamination
  • In situ ground water remediation