Case Studies
Hydrocarbon Remediation and Asbestos Removal, Fuel Storage Depot
Remediation & Enabling
SITE: Sutton’s Wharf, Mile End, London
CLIENT: TEAM Limited
CONTRACT VALUE: £3.8million
Re-measurable £3.8million contract to undertake asbestos removal, demolition, remediation and enabling works of a 1.25 Hectare former gasworks and fuel storage depot to enable its redevelopment for residential apartments with basement car parking facilities. Enabling works included site demolition, breaking out and removal of all foundations and backfilled storage tanks, excavation of leading trench for sheet piled retaining wall, installation of a piling platform and temporary foul sewer diversion.
The proposed redevelopment footprint (with basement car park) covered approximately 95% of the total site area, presenting considerable constraints on site logistics. Due to historical land-uses there was extensive contamination within soils and perched groundwater underlying the site, and substantial below ground structures requiring removal to facilitate construction of the basement. Planning restrictions were also in place for removal of contaminated materials off-site, with a requirement for at least 50% of materials to be transported off-site by barge via the adjoining canal. The main demolition constraint was the former asbestos cement cladded industrial building was overhanging the Regent / Grand Union Canal, therefore requiring manual dismantling with crane operations.
Tamdown Regeneration designed and implemented a solution including the excavation, sorting, screening and decategorisation treatment of 28,000m3 of contaminated soils to facilitate the basement construction and to achieve overall remediation targets. Through these processes the volume of soils disposed off-site as hazardous waste was reduced to only 5,000m3, enabling non-hazardous soils to be transported off-site via canal under consent from British Waterways.
To facilitate excavation and to achieve remedial targets for shallow groundwater, approximately 1000m3 of free-phase hydrocarbon impacted water was pumped and treated on-site prior to discharge to foul sewer under temporary consent.
Completion was supported by a comprehensive programme of validation analysis and monitoring, undertaken by Golder Associates on behalf of Tamdown Regeneration.
