If your site is contaminated then steps
will have to be taken to clean it up.
This stage is called remediation. It involves making the soil on site fit for the intended use, there are a number of ways to achieve this.
Once the favored method of remediation this involves digging the soil up removing to land fill, and then replacing the soil from a clean source. Landfill tax has made this a very expensive option. Although for small sites in can prove cost effective.
Soil can be taken away for washing or other types of cleaning and exchanged for a conditioned soil substitute.
When considering a site investigation prior to remediation it is important to realise that the the more sample points you take the better "resolution" you will achieve for assessing areas that need remediation, an extra £1000 spent on sampling may yield 5, 10, 15 times that in savings upon remediation.
Decisions we make about how a site is treated depend very much on the site itself. They also depend on factors such as the type of contamination, the geology of the site, legal requirements (for example there are some differences between making land safe through the planning process compared to Part 2A of the Environmental Protection Act 1990), cost/benefit implications and the proposed/current use for the site.
Protecting any proposed development from ground gas has to be considered
early on in any design process. Ground gases from contaminated sites can be
methagenous, or carbon dioxide. Some may be aggressive, in that they will cause
installed barriers to degrade.
Protecting any proposed development from ground gas has to be considered early on in any design process. Ground gases from contaminated sites can be methagenous, or carbon dioxide. Some may be aggressive, in that they will cause installed barriers to degrade.
|Specification for the barrier its self is just
a small part of a successful mitigation strategy. SWEL can produce a
ground gas protection strategy to inform architects and planners alike.
The installation of the ground gas barrier should be carefully installed and you will likely require specialist input.
Sealing of joins between membrane, and service entry point will ensure a good seal but the correct methods will need to be employed to satisfy any follow up inspection prior to laying of the screed.
Environmental Consultants Bristol
Environmental Consultants Exeter
Environmental Consultants London
Land Remediation Consultants
Bristol - 01173 270 092
Exeter - 01398 331 258
London - 02076 920 670