Ex-situ Bio-Pile and Sustainability Project - Faversham, Kent.
14 January 2011, News release from Ecologia Environmental Solutions Ltd
Ecologia completed the successful remediation of a former cast iron foundry in Faversham, Kent. The 2 hectare site was to be developed for a mixed residential and commercial end use.
Ecologia was appointed to carry out post-demolition remediation operations, including the excavation and treatment of all site-won contaminated and non-contaminated materials, in accordance with site specific remedial targets derived by a Quantitative Risk Assessment (QRA) for a mixed residential and commercial land use.
At an early stage in the project it became apparent that some of the foundry sand present on site was surplus to the requirements of the development. Therefore, prior to undertaking the works, Ecologia liaised with the Environment Agency to agree the implementation of a Materials Management Plan (MMP) in accordance with the recently introduced CL:AIRE Approved Code of Practice.
The MMP was set up with the former foundry as the 'hub site' and a framework of nearby locations designated as the 'receiver sites'.
The MMP ensured that site won materials were re-used only in areas of the site where it was appropriate to do so (e.g. meeting specifications determined by the QRA). The MMP also provided an audit trail of the movement and quantities of material re-used, both on and off site.
Appropriate segregation of materials on site was achieved by implementing a complex sorting approach which resulted in segregation of material from different sources following selective excavation, concrete crushing, sand screening and selective stockpiling.
On-site treatment of excavated contaminated soils was carried out using ex-situ bio-remediation. The remediation strategy also required a limited pump and treat using an oil water (O/W) separator combined with a granular activated carbon (GAC) filter for treatment of groundwater and run off prior to discharge under license to foul sewer.
A total of 14,090 m3 of site won material was handled and treated on site, with only 120 m3 of site won material being sent for off- site disposal.
|Material Type||Volume (m3)||Reuse||Location|
Site Won Crushed Concrete
|1500||Site levelling||Residential Development Faversham Foundry Site|
|2000||Piling Columns or Site levelling||Faversham Foundry Site|
|200||Temporary access road||Whitstable Development|
|700||Piling Mat or Piling Columns||Faversham Foundry Site|
|Foundry Sand||4000||Site levels and sub base||Faversham Foundry Site|
|4000||Building Development, sub-base||Faversham, Kent|
|Screened Hardcore||900||Piling Mat||Faversham Foundry Site|
|Bio-treated Soils||670||Residential and commercial Site levelling||Faversham Foundry Site|
|General Waste||120||Off site disposal||Waste Transfer Plant / Landfill|
For further information please email Ecologia Environmental Solutions Ltd