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What are Acid Sulphate Soils?

Welcome to our "Building Design Services" Blog where our aim is to help you gain a better understanding of the planning approval process.


We are based on the Central Coast, NSW, and help locals with the daunting task of preparing building plans & documentation to submit to the relevant Certifying Authority.


Acid Sulphate soils means naturally occurring sediments and soils containing iron sulphides or their precursors, who’s exposure to oxygen leads to the generation of sulfuric acid. This occurs in low lying coastal areas generally below 5m Australian Height Datum (AHD) and can include waterlogged soils and estuarine / marine sediments.

 

Acid Sulphate Soils are rated from Class 1 to Class 5, with Class 1 being the worst in relation to development.

 

Class 1 - Likely to be found on and below the natural ground surface.

Class 2 - Likely to be found below the natural ground surface.

Class 3 - Likely to be found beyond 1 metre below the natural ground surface.

Class 4 - Likely to be found beyond 2 metres below the natural ground surface.

Class 5 - Acid sulfate soils are not typically found in Class 5 areas. Areas classified as Class 5 are located within 500 metres on adjacent class 1,2,3 or 4 land.

 

Land that is classified as Class 1 & Class 2 Acid Sulphate Soils will require a Development Application for any proposed works. ie: Complying Development Application will not be permissible.

 


Disclaimer

* This is general (not site specific) information based on information available at the time of the post.

Always check to ensure this is the latest information and stay tuned for updates.


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