Projects - Case Studies

Certas Energy, Portsmouth

The Client

Certas Energy

project overview
This project focuses on the redevelopment of an existing oil and fuel storage and distribution depot located within a dock environment subject to a high tidal water table. The project involved complex civil engineering challenges, including the installation of a temporary cofferdam to facilitate deep excavations in water-sensitive areas. This excavation is necessary to accommodate the installation of key infrastructure, such as drainage attenuation tanks, an interceptor, and a pumping station. The cofferdam was crucial in creating a dry working environment for these activities, ensuring the project proceeded efficiently and safely despite the fluctuating water levels.
Value Bracket

£750k - £1m

Sector

Fuel

Work Type

Civils

Completion Date

December 2023

Challenges

The Challenges & Changes

Unsuitable ground conditions encountered
The project encountered several challenges during execution, notably with the ground conditions, which were unsuitable for supporting a traditional concrete raft foundation for the tanks. To address this, concrete piles were installed to stabilize the ground, ensuring the structural integrity of the tanks. Additionally, the drainage system had to be reconfigured and rerouted due to the incorporation of a new attenuation system, requiring design adjustments to manage water flow effectively and meet environmental standards. These changes were critical to ensuring the long-term success and functionality of the depot’s upgraded infrastructure.
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