Seymour successfully delivered the drainage, ducting, and civil infrastructure package for Yorkshire Water’s WINEP Civils Programme. Working under Tilbury Douglas on a live, flood-prone site, works were carefully phased and coordinated to maintain ongoing operations.
Project Scope
Our works included:
- Vacuum excavation to verify existing underground services
- Diamond drilling 200mm holes through manholes to connect new drainage
- Excavation and earthworks for new drainage, ducting, and utilities
- Removal of redundant draw pits and ducting
- Installation of 150mm drainage pipework with connections to existing and new chambers
- Installation of ACO channels for surface water management
- Construction of new manholes and draw pits
- Installation of new ducting and duct boxes with bespoke spring-assisted covers and 3m x 3m hardstandings
- Installation of 50mm MDPE water pipework with new and existing connections
- Construction of site and haul roads, including a ¾ mile Type 1 haul road, concrete roads, bunded sections, and a turning circle
- Construction of a bunded chemical storage area
- Construction of an 8m x 4m reinforced concrete slab for a dosing kiosk with water and drainage for an emergency shower
- Installation of Armco barriers and protective bollards
- Installation of bespoke Kennedy-style removable grating covers to the interceptor chamber
- Reuse of all inert arisings for reed bed remediation to support sustainability
Design & Construction
Service verification was completed using CAT scanning and Vac-Ex. New drainage, water, and ducting networks were installed alongside a reinforced concrete slab for a chemical dosing kiosk. Access roads, turning circles, and bunded sections were carefully constructed, with phased delivery ensuring continuous operation on the live site.
Challenges Overcome
Unexpected asbestos was safely managed under the Tilbury Douglas Asbestos Management Plan, using specialist removal, PPE, and staff training to maintain regulatory compliance. Overhead power lines crossing the site were controlled under permit with banksmen and in accordance with GS6 guidance. Groundwater ingress was carefully managed via pumping and a controlled discharge plan to prevent environmental impact.
Added Value
The project maintained full operational continuity on a live, flood-prone site. Reuse of inert arisings for reed bed remediation supported sustainability objectives, and bespoke ducting, covers, and hardstanding ensured long-term durability and ease of maintenance.
