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Decommissioning Storage Systems that were in use on or after 31 March 2010


A person required to obtain a Decommissioning Assessment Report must engage a professional who is certified under the CEnvP(Site Contamination) scheme to manage the works and actions required and to author the report. The directory of certified practitioners is located at: https://www.cenvp.org/directory/ (ensure that the certification type for the consultant states “Site Contamination Specialist Certification").

Further  information is available on the Engaging a Contaminated Site Assessment Consultant web page.


Regulation 30 of the UPSS Regulations requires that if a UPSS ceases to be used the infrastructure owner must temporarily or permanently decommission the storage system.

Temporary decommissioning can only occur for 12 months and the system must be back in use within this time limit or the storage system must be permanently decommissioned. Note that exemptions can be applied for under Regulation 39.

Requirements in Regulation 30 relating to permanent decommissioning include:

  • Decommissioning must commence within 2 months of the system ceasing to be used (except where the cessation of use is due to repairs or replacement of infrastructure or an environmental site assessment triggered by loss verification and then the time limit is 4 months).

  • The storage system must be removed and disposed of in accordance with Australian Standard AS 4976 - The removal and disposal of underground petroleum storage tanks (AS 4976) or where the storage system cannot be removed safely without serious risk to the safety of people or adjoining infrastructure, the tanks can be decommissioned in-situ, in accordance with AS 4976, without being removed. Note - all lines, fill points etc still need to be removed even if the tank is decommissioned in-situ.

  • The removal or in-situ decommissioning should be done by a suitably experienced person due to the explosive risk posed by petroleum vapours. To select a tank removalist you may wish to contact your fuel supplier or Workplace Standards Tasmania.

  • An assessment must be conducted to determine whether petroleum has contaminated soil and groundwater in the vicinity of the storage system (i.e. has the system leaked into the environment and what level of contamination is present) and whether this contamination is likely to cause harm to the environment (including human health).

  • The works and actions associated with the assessment must be managed by a professional who is certified under the CEnvP(Site Contamination) scheme.

  • The assessment must be conducted in accordance with the EPA Guideline UPSS2 - Underground Petroleum Storage Systems: Decommissioning Assessment - Sampling and Risk Assessment Requirements (see link under Related Documents).

  • A Decommissioning Assessment Report detailing the assessment must be obtained by the infrastructure owner within 4 months of decommissioning occurring.

  • The decommissioning report must be written in accordance with the EPA Guideline UPSS1 - Underground Petroleum Storage Systems: Decommissioning Assessment Report Requirements (see link under Related Documents).

  • The report must be authored by a professional who is certified under the CEnvP(Site Contamination) scheme.

  • The Decommissioned UPSS Form must be completed and submitted to the Director within 7 days of obtaining the report (see link under Related Documents). 

Disposal of Soil and Liquid

Please note that all tank/storage system contents and any soil or water contaminated with petroleum are likely to be controlled wastes and if they are a controlled waste they must be transported and disposed of or treated appropriately. Information relating to controlled waste is available on the Controlled Waste webpage.

Contaminated Sites Unit
134 Macquarie Street
Hobart TAS 7000
Phone: 03 6165 4599 Fax: 03 6173 0254
Email: Enquiries@epa.tas.gov.au