Asbestos, a naturally occurring mineral, was once commonly used in construction due to its durability and resistance to heat and chemicals. However, it was later discovered to pose serious health risks, prompting strict regulations and a complete ban on its use in Australia. Despite these measures, asbestos remains present in many older buildings and contaminated soils. This blog explores the risks of asbestos soil, methods for identification, and best practices for remediation.
Understanding Asbestos Soil and Its Risks
Asbestos can be found in soil due to improper demolition, construction practices, or the use of contaminated topsoil or landfill. Buildings constructed before 1990 are more likely to contain asbestos, which may end up in the soil from bad construction, demolition, or landscaping practices.
Asbestos only becomes a hazard when its fibres are released into the air and inhaled. The risk level is determined by the type of asbestos, the amount present, and the condition of the material. Bonded asbestos, like asbestos cement sheets, presents a lower risk as the fibres are embedded within the material. However, friable asbestos, which consists of loose fibres, is much more dangerous and can easily become airborne when disturbed.
Identifying Asbestos Soil
Identifying asbestos soil can be challenging, as it is often not visible to the naked eye. Larger fragments of asbestos-containing materials (ACMs) may be visible, but the asbestos fibres themselves are extremely thin and hard to detect. Soil sampling is the most effective way to determine if asbestos is present. Samples should be collected from key areas of the site and sent to a lab for professional analysis.
There are several clues to indicate potential asbestos contamination:
- Old fibre cement pieces or half-buried roof cladding found on the site.
- Run-off from damaged asbestos-containing materials, such as roof tiles, may cause fibres to enter the soil.
- Uncontrolled dumping or improper demolition of structures containing asbestos, leading to contamination.
- Factory waste products were used as fill or paving surfaces during mid-20th-century construction.
If you suspect asbestos contamination, contact your local council for information on the site’s history or check the Hazardous Activities and Industries List (HAIL) register. Professional testing is essential for confirming the presence of asbestos and ensuring safety.
Managing and Remediating Asbestos Soil
There are two major ways to manage soil contaminated with asbestos:
- In Situ Management: This approach is used when contamination levels are below a certain threshold. The soil remains in place, but additional measures are taken to minimise risk. These measures include covering the site with clean topsoil, planning construction to avoid disturbing the soil, or capping the area with a hard surface like concrete.
- Soil Removal: This method involves excavating and removing all contaminated soil from the site. It eliminates the need for ongoing site management, as the asbestos is entirely removed.
Conclusion:
Both methods require the expertise of licensed professionals. Melbourne Soil Testing is fully equipped to handle all forms of asbestos testing. We provide thorough assessments and safe, effective remediation to ensure your property is free from asbestos hazards. Get in touch with us today to schedule asbestos testing for your site. Call us at 03 9115 8105 or email info@testneeds.com.au.
