Waringfield WwPS is located on a constrained site between two housing developments and is bounded on one side by a much-loved Victorian stone wall dating back almost 200 years, this meant meticulous planning, communication and forward-thinking solutions were required.

To add to the challenges, the construction work had to be completed while maintaining operation of the existing site. To facilitate this operation, the storm sewer had to be rerouted through the gardens of three properties adjacent to the WwPS site.

To ensure continuity of WwPS operations, the project was executed in phased construction stages. Each phase was carefully coordinated to maintain essential services while allowing for progressive development of new infrastructure. Temporary measures and bypass arrangements were required to facilitate construction while preserving functionality.

The restricted area posed significant logistical difficulties for traditional excavation methods, necessitating alternative construction techniques.

Due to spatial constraints, a caisson shaft method of construction was used. This approach provided additional stability in managing groundwater pressures, further mitigating uplift concerns. Additionally, the required depth for integration into the existing sewerage network and emergency storage for the WwPS made the caisson method a viable engineering approach.