Former EMI Records Factory, Hayes

Client: Willmott Dixon Housing Ltd
Date: 2014 (16 Weeks)
Nature of Works: Soil & Groundwater Remediation, Stabilised Development Platform
Contract Value: £295,000 JCT Lump Sum Contract

The site is being redeveloped to a high-rise mixed-use scheme by Willmott Dixon Housing. Historically utilized as the former yard and record production areas of the wider EMI Factory, the site contained significant in-ground structures associated with a tank farm with free-product contamination identified within Taplow Gravels (a Principal Aquifer). Made ground locally contained asbestos containing materials, and well as a plating chemicals hotspots and other localised sources of hydrocarbon contamination.
Soilfix designed and implemented a multi-disciplinary remediation scheme with engineered development platform in accordance with a Materials Management Plan (MMP) developed fully in accordance with CL:AIRE Code of Practice (CoP). Works carried out including:

• Decommissioning of tanks, interceptors and oily water filled structures;
• Breakout & removal of slabs/sub-structures;
• Processing of recovered hardcore to required specification;
• Excavation and treatment of hydrocarbon contaminated soils;
• Excavation and disposal of asbestos contaminated soils;
• Reduced level excavation of made ground to required formation levels, screening and stabilisation to form a suitable development platform for ongoing construction works;
• Deeper soil stabilisation for additional ground improvement below ground-bearing slabs; and,
• Surfactant-enhanced free-product recovery from Taplow Gravels.

Soil / groundwater verification testing and reporting was carried out to achieve regulatory signoff. Stringent health, safety & environmental controls were implemented to meet the client’s high expectations – as a result the Soilfix Site Manager was awarded a ‘Green Card’ for exemplary standards achieved.