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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.

Types of Remediation

Dig and Dump

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.

Off Site Treatment

Soil can be taken away for washing or other types of cleaning and exchanged for a conditioned soil substitute.

On Site Treatment

Soil can be treated on site in a number of ways:

- Chemical Treatment
- Physical Treatment
- Biological Treatment
- Solidification
- Thermal

This method is suitable for large sites.

Please feel free to ring / email for a no obligation discussion.

Sample Resolution & Remediation

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.

How to Remediate a Site

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. 

Ground Gas

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


S.D. Content

Land Remediation Consultants

Bristol - 01173 270 092

Exeter - 01398 331 258

London - 02076 920 670