Remediation & Enabling Works - Stephenson Street

Client: Berkeley Homes
Sector: Residential / Infrastructure

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Project Overview

Provectus supported the transformation of a former gasworks and railway sidings site into a new residential-led development. With a legacy of hydrocarbons, asbestos, and heavy metals, plus proximity to sensitive Network Rail and London Underground assets, the project demanded a highly controlled remediation and enabling works package.

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Key Challenges

• Hydrocarbon, metals, and asbestos contamination.

• High risk of unexploded ordnance (UXO) due to historic railway sidings.

• Live constraints working alongside Network Rail and LUL assets, including high voltage cabling.

• Temporary works designs required adjacent to Jubilee Line and C2C viaduct.

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Our Approach

• Developed a Materials Management Plan to maximise reuse of site-won soils.

• Excavated and levelled 56,000 m³ of soils, re-engineered 32,000 m³, and disposed of 9,500 m³ safely off-site.

• Installed 21,000 m² of 6F2 piling mats for foundation works and pedestrian bridges.

• Completed UXO clearance using a rig-mounted magnetometer under specialist watching brief.

• Delivered Category 2 and 3 temporary works designs to protect adjacent rail infrastructure.

• Worked under HV supervision to safely excavate around Network Rail’s assets.

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Project Outcomes

• Provided a remediated, safe platform for new housing and infrastructure.

• Ensured full compliance with Network Rail and LUL safety standards.

• Reduced off-site disposal through targeted reuse strategies.

• Enabled piling and bridge construction works to proceed without delay.

Key Numbers

• 56,000 m³ cut to construction level

• 32,000 m³ fill reused

• 9,500 m³ soils disposed off-site

• 21,000 m² piling mat installed