About the Project
Coffey, a leading civil engineering, construction, and water infrastructure specialist operating across the UK and Ireland, was appointed as a key delivery partner on the Trimpley to Hampton Loade Pipeline Project, a major strategic initiative commissioned by Severn Trent.
The project plays a pivotal role in strengthening water supply resilience for 65,186 customers currently reliant on Trimpley Water Treatment Works (WTW). Section C of the scheme was instrumental in enabling the phased construction of an 11.5 km, 500 mm internal diameter single-directional pipeline, running from South Staffordshire Water's Hampton Loade WTW to Severn Trent's Trimpley Top Service Reservoir.
Once operational, the pipeline will allow for the transfer of up to 20 megalitres per day (Ml/d) in the event of a failure at Trimpley WTW, ensuring continuity of service and reducing the risk of disruption to thousands of homes and businesses. As a key asset in the regional network, Trimpley's single-source dependency presented a significant resilience challenge. This project directly supports Severn Trent's AMP7 2nd Source Resilience commitment and regulatory obligations.
Coffey's efficient and minimally disruptive delivery of Section C has significantly enhanced long-term water security across the region and helped safeguard public health, customer satisfaction, and environmental compliance.
Phenna Infrastructure Division Supporting Coffey
Companies from Phenna Group Infrastructure Division were proud to collaborate with Coffey on the successful delivery of this high-impact project, providing a wide range of specialist support services including ecological consultancy, geotechnical investigation, materials testing, and infrastructure condition analysis.
RammSanderson
An experienced ecological and environmental consultancy, RammSanderson supported the scheme through a comprehensive suite of protected species and habitat surveys, ecological mitigation strategies, and planning compliance measures. The team obtained a Great Crested Newt District Licence, significantly reducing cost and programme risk, while also developing a Precautionary Method of Works to address ecological sensitivities around Hazel Dormouse populations. RammSanderson has remained involved throughout construction, acting as the Site Ecological Clerk of Works to ensure ongoing ecological compliance.
CGL
CGL, a leading geotechnical and geoenvironmental consultancy, delivered essential site investigation services, including rotary cored boreholes to assess former coal mining activity and ground gas risks. Additional works included vacuum-excavated trial holes near high-pressure gas mains and soil classification testing to support environmental compliance. CGL were reactive to Coffey's timescales and requests to ensure their investigation was undertaken within time and budget.
“This project exemplifies the power of integrated technical delivery. Through close collaboration with Coffey, our companies provided timely, specialist support across ecology, geotechnics, materials testing, and asset management. It’s a great example of how expert-led services can collectively de-risk infrastructure programmes and drive successful outcomes for clients and communities.” — David Buckley, Managing Director, Geotechnical & Environmental Consultancy, Infrastructure Division.
Stuart Abbs, Phenna Group Divisional MD, Infrastructure, went on to say, "This goes to show how close collaboration with our infrastructure division can make a tangible difference in complex infrastructure schemes. Our collective expertise across ecology, geotechnical investigation, materials testing, and asset management enabled us to support Coffey in delivering a resilient and efficient solution for Severn Trent."
CTS
CTS supported the project with a full suite of construction materials and pavement testing services. This included California Bearing Ratio (CBR) assessments, nuclear density testing, plate bearing tests, concrete cube compressive strength analysis, and extensive soils and chemical testing for contaminated materials.
XAIS-PTS
XAIS-PTS provided end-to-end pavement analysis and infrastructure asset management services, including visual condition surveys, coring, skid resistance, and texture depth assessments. Their work ensured the condition of the A5199 was fully monitored before, during, and after construction, supporting sustainability and asset integrity for the wider network. They also went on to undertake pavement analysis on the A442 and surrounding feeders, supporting Coffey on an additional project.
“This project is a great showcase of multi-disciplinary collaboration, where each infrastructure company brought expert capabilities to the table. Phenna Infrastructure Division’s strength lies in uniting leading-edge consultancies to help clients deliver essential infrastructure with confidence.” — Phil Marshall, CEO, Phenna Group
Visit our Infrastructure Division page to learn more about our companies and the services they offer.