Kier has secured its largest wastewater contract to date after being appointed to the £265m upgrade of Thames Water’s Maple Lodge Sewage Treatment Works in Hertfordshire.
The contractor has been awarded an £8.7m early contractor involvement (ECI) contract to support the development of the flagship AMP8 project, working alongside Thames Water and the design team to refine the scheme, manage delivery risks and prepare the project for construction.
Located at Maple Cross, near Rickmansworth, Maple Lodge Sewage Treatment Works serves almost 500,000 people across west Hertfordshire. The 24-acre site treats wastewater before discharging it into the Grand Union Canal and the River Colne.
The major upgrade is designed to increase the site’s treatment capacity while improving operational resilience and environmental performance. The works will also provide additional storm storage and will be delivered while the treatment works remains fully operational.
The project is expected to include new and upgraded storm storage facilities, inlet works, screening systems, primary settlement tanks and biological treatment processes. Plans also include new final settlement tanks, tertiary treatment infrastructure and enhancements to the site’s electrical, control and monitoring systems.
Andy Lingham, managing director for water at Kier, said: “Maple Lodge is a flagship AMP8 scheme and an important example of the type of complex infrastructure programme now underway across the sector.”
The appointment further strengthens Kier’s long-standing relationship with Thames Water. Previous projects delivered by the contractor for the utility include the upgrades to Deephams Sewage Treatment Works, the £66m improvement programme at Mogden Sewage Treatment Works and the £45m Faringdon to Blunsdon pipeline.
