How to prevent, manage & remove asbestos in soil
EDP’s Environmental Management teams provide expert guidance for the assessment and management of environmental hazards and risks across all types of land and projects. A key aspect of our service is assessing and analysing contaminated land and then developing remediation and management strategies to mitigate the potential impact on development, construction or any other use of the land.
What is asbestos in soil?
Asbestos is highly hazardous and is a common contaminant of land earmarked for development and construction across Australia. If asbestos fibres become airborne and are inhaled, they present a serious risk to health. In December 2003, asbestos was banned in Australia making it illegal to import, store, supply, sell, install, use or re-use asbestos materials. However, prior to this, Australia was the highest per capita user of asbestos products in the world. Therefore, asbestos is a common contaminant in soil on sites through industrial use, waste disposal or demolition of previous constructions.
Asbestos in soil can take a range of forms, each of which is likely to present asbestos contamination to varying degrees of concentration, degrees of deterioration and size of materials. The types of asbestos most likely to be found in contaminated soil are:
Asbestos-Containing Material (ACM);
Fibrous Asbestos (FA); and
Asbestos Fines (AF).
Contamination is often identified during a change of land or property use and has significant implications for landowners, developers, purchasers, councils, communities and other stakeholders.
What causes asbestos in soil?
Asbestos is a naturally occurring, fibrous, silicate mineral that was used extensively within building products throughout Australia (typically between the 1950s and the 1970s) due to its reinforcing and insulating properties. Asbestos is present in as many as one in three homes in Australia built prior to 1990. This historical use of asbestos in building materials, coupled with poor demolition and disposal practices, has resulted in widespread asbestos contamination in soils throughout Sydney and Australia, such as:
Poor demolition and removals;
Onsite building waste;
Roof runoff to soil;
Use of contaminated recycled materials;
Damage to properties (i.e. from fire / severe weather event);
Underground infrastructure (telecoms pits and pipework);
Asbestos disposal sites; and
Naturally occurring asbestos.
Given the complexities associated with the soil environment, asbestos in soil contamination must be managed with careful consideration of the potential for it to impact on human health during preparation, development and construction activities on the land. The long-term risk to people using the land and future developments must also be considered.
The risk of asbestos in soil is dependent on the previous uses of the site, the quantity and nature of the asbestos material used in previous construction activities and the way that previous buildings were demolished or renovated.
How to prevent asbestos in soil
There has been significant development in our understanding of the risks and hazards that asbestos presents to human health during the last 30 years. Since 2003, when Asbestos was banned in Australia, substantial legislation and codes of practice have been developed to ensure that those involved in demolition, waste disposal and land management are managing and preventing the contamination of soil and land with asbestos and other contaminants. However, a historical lack of understanding and absence of legislation, along with continued examples of non-compliance and poor management, means that there remain many pieces of land and property where soil contamination by a range of contaminants – including asbestos – is present.In these instances, it is essential that Contaminated Land and Hazardous Materials specialists are engaged in the assessment, analysis and remediation of contamination in soils and plans for the development and use of contaminated land.
Identification of Asbestos Contamination in Soil
Identification of Asbestos contamination must be completed by a suitably qualified and experienced assessor/ competent person. The competent person must be able to identify, investigate and assess asbestos contamination as part of wider environmental site assessments.
This should include:
A site history review;
Review of records (asbestos register, aerial photos showing structures);
Review of development plans; and
A site visit and walkthrough.
Visual observation can be used initially utilising a grid based systematic walkthrough of areas of concern that have been identified during preliminary site investigations. During visual observation, comments should be made on the presence, or absence, condition (bonded or friable) and distribution of asbestos materials. Any dumped material, uncontrolled fill and structural footprints should be identified and suspected of containing asbestos materials. Additionally, any existing asbestos containing structures should be noted.
Field sampling may be undertaken for confirmation of assumptions, such as rough impact delineation or to confirm asbestos presence within suspected material.
The concentration of asbestos in soil does not necessarily mean that airborne fibres will be released. For an accurate picture of the risks and hazards associated with Asbestos in soils, a Tier 2 exposure assessment involving air monitoring should be undertaken to quantify the potential risk associated with disturbing asbestos.
Management of Asbestos Contamination in Soil
If Asbestos contamination of soil is not identified early, managed properly and monitored on an ongoing basis, then disturbance of the soil can result in the release of asbestos contaminants which pose a substantial risk to human health. This can result in costly delays to development, construction and land management projects through the need for extra investigative and remediation activities.
It is therefore essential for landowners and developers to commission assessment of potential contaminated land and in particular, to identify the nature and extent of any asbestos contamination in the soil. This early assessment is crucial in assessing the likelihood and risk of contamination and where contamination occurs, forming an appropriate plan for its management.
Asbestos in Soil Risk Assessment
A risk assessment should be conducted using a conceptual site model with illustrated source-pathway-receptors that includes all activities associated with the site for the current use, during remediation and future uses whereby asbestos fibres may become airborne and pose a human health risk. The nature and extent of present asbestos should be set out in sufficient detail as qualitative human health risk assessments are acceptable.
What regulations need to be followed when dealing with asbestos in soil?
Asbestos contaminated soil is managed under both environmental regulation through the EPA and Work Health and Safety Regulation through State-based SafeWork departments. These State and Territory based government agencies provide strict guidelines which require careful navigation when undertaking works involving asbestos contaminated soil.
In addition, there are a number of key documents that industry professionals refer to when dealing with the management of asbestos contaminated soil. Such as:
- National Environment Protection Council: National Environment Protection (Assessment of Site Contamination) Measure (2013) which identifies criteria for assessment and remediation of non-friable and friable asbestos in soil; and
- WA Department of Health: Guidelines for the Assessment, Remediation and Management of Asbestos-Contaminated Sites in Western Australia (May 2009).
Asbestos in Soil Removal Services from EDP
The assessment of asbestos contamination in soil is a specialised area that should only be conducted by a competent person who has the knowledge and skills to identify, investigate and assess the contamination present. As expert advisors, EDP can undertake site evaluations, Asbestos in Soil Risk Assessments and provide recommendations and guidance on remediation and management of Asbestos in Soil.
EDP can also develop site specific strategies to manage asbestos in soil contamination. Our experts provide project specific, cost effective solutions to deliver the required outcomes to ensure that previously contaminated sites are made suitable for future use.
To avoid conflicts of interest, EDP does not conduct asbestos removal however, we can provide contact details of numerous industry leaders that conduct removal works. EDP can review the selected contractors work method, or asbestos removal control plan (ARCP), to ensure that it meets legislative requirements and is achievable. EDP also provides supervision and asbestos air monitoring to observe the implementation of site controls and demonstrate the effectiveness of control measures. We can provide a clearance verification following removal/remediation that certificates that the work undertaken was conducted to a suitably high standard.
To find out how EDP can help you with a safe management of Asbestos in Soil, get in touch below.
For more information and to discuss your Asbestos Soil needs contact us at firstname.lastname@example.org or call +61 2 8484 5810