Common in Western Australia’s coastal and wetland regions, acid sulfate soils (ASS) are naturally occurring, sulfide-rich soils and sediments.
Undisturbed, they pose little to no harm. However, if exposed to air through construction, agriculture and other activities, the sulfides will oxidise to produce sulfuric acid. This can cause significant degradation of the natural environment and human made structures.
Because of this, the Western Australian Department of Water and Environmental Regulation (DWER) has set a list of stringent guidelines to protect our environment from the effects of acid sulfate soils.
Implementing an acid sulfate soil management plan (ASSMP) is the most effective way of ensuring compliance and mitigating the environmental and structural risks associated with ASS.
We have created this article to give you tips on how to implement an effective ASSMP. If you would like further information or assistance with creating a soil management plan, please contact WSW at sam@westsoilandwater.com.au or on 0424 021 264.
Conduct a Comprehensive Site Assessment: Before commencing any development, conduct a detailed investigation to identify the presence and extent of ASS. This information provides a foundation for effective management strategies.
Develop a Robust ASSMP: Based on the site assessment, create a tailored ASSMP that outlines:
Avoidance Strategies: Design project plans to minimise or eliminate the disturbance of ASS, thereby reducing the risk of acid generation.
Neutralisation Methods: Specify the use of neutralising agents and their appropriate application rates (based on soil acidity levels).
Water Management Plans: Implement controlled drainage and maintain appropriate water tables to prevent sulfide oxidation.
Monitoring Protocols: Establish regular monitoring of soil and water quality to detect and address changes promptly.
Contingency Measures: Prepare strategies to manage unexpected ASS exposure and acidification events effectively.
Gain Regulatory Approval: Submit the ASSMP to DWER for review and approval. Ensure that the plan meets all requirements and addresses potential environmental impacts comprehensively.
Implement the ASSMP On-Site: Once approved, execute the ASSMP during works or development. This includes:
Training Personnel: Educate all staff and contractors about ASS risks and the specific management strategies outlined in the ASSMP.
Monitoring and Documentation: Conduct regular monitoring (as specified in the ASSMP), documenting soil and water quality to ensure management measures are effective.
Adaptive Management: Be prepared to adjust strategies in response to monitoring results or unforeseen site conditions. Maintaining flexibility strengthens your environmental protection.
Carry out Closure Reports: Upon completion of works, compile a closure report detailing the management actions taken, data and effectiveness of the ASSMP. Submit this report to DWER to demonstrate compliance and to inform future works on the site and in the area.
WSW always recommends engaging experienced environmental consultations to facilitate the development and implementation of your ASSMP.
We have proven experience tailoring soil management plans to the unique conditions of Western Australia and use this experience to provide you with a comprehensive, cost-effective solution.
West Soil & Water is able to create an ASSMP or update your existing plan to maximise its protection. If you would like to speak with a member of our team, please contact us at sam@westsoilandwater.com.au or on 0424 021 264.
