Underground Tank Removal
Australian Enviro Services is experienced in underground tank removal, in-situ abandonment and other related fuel infrastructure decommissioning services. Underground fuel storage tanks (USTs) that are no longer required or are unsuitable for the storage of petroleum or hazardous products need to be dealt with in a timely and appropriate manner. Over time USTs and associated pipework are likely to corrode and inevitably leak. The greatest potential threat from a leaking UST is contamination of soil and groundwater. A leaking UST can present other health and environmental risks, including the potential for fire and explosion. The environmental and financial impacts to the tank owner, neighbouring properties and the broader community can be significant if not handled professionally.
The safe removal of USTs and the potential remediation of surrounding contaminated soil and groundwater is a technical process that should only be tackled by an experienced professional. A firm grasp of legislation, environmental considerations, OH&S and project management requirements are necessary to complete the tank removal process safely, effectively and legally.
Australian Enviro Services is a professional remediation company. They also offer waste management, asbestos contaminated soil remediation and underground storage tank removal.
Underground Tank Removal – Legislative Guidelines
The guidelines in NSW that cover tank removal and site validation include, but are not limited to:
- Protection of the Environment Operations (Underground Petroleum Storage Systems) Regulation 2014
- AS 4976 (2008) The Removal and Disposal of Underground Petroleum Storage Tanks
- NSW EPA Technical Note: Investigation of Service Station Sites (2014)
- National Environment Protection (Assessment of Site Contamination) Measure (2013)
In short, only an appropriately licensed, experienced and trained professional should undertake UST removal works.
Underground Tank Removal – Safety Requirements
Safety requirements that need to be considered during fuel tank removal works include, but are not limited to:
- Workers being General OH&S inducted and site specific inducted
- Establishment of exclusion zones consisting of but not limited to fencing and safety signage
- Elimination of ignition sources within the exclusion zone
- 2 x 9kg dry chemical fire extinguishers
- Lower explosive limit (LEL) and oxygen monitoring
- Personal protection equipment (PPE) that includes long pants and shirts, half face air respirator (task specific), safety vest, steel capped boots, gloves, helmet and safety glasses
Insitu Abandonment
- Documenting work instructions and all relevant permits prior to the commencement of works.
- Service location of forecourt above the UST to confirm the non-presence of service conduits
- Removing all possible product from the tank using the normal pumping system.
- Disconnecting and isolating dispensers and other above ground pumping equipment.
- Removing any residual product using a pump suitable for a hazardous area and a suction hose and/or spear.
- Excavation down to the top of the tank
- Sealing all ground level connections to the tank except for the vent. All tank top fittings shall be exposed by excavation.
- Draining and disconnecting all piping.
- Purging the tank of product vapour as per AS4976-2006 requirements.
- Filling the tank with a free flowing inert solid material such as concrete slurry, sand or foam.
- Disconnecting the vent and plugging all tank openings.
- Removing all redundant piping associated with the tank. Any pipe that is impossible to be removed shall be isolated, drained and plugged at both ends.
- Reinstatement and compaction of the excavation
- Documenting the procedure in a written report
Australian Enviro Services are experienced in underground storage tank removal. You can find more information about our tank removal services on these pages: UNDERGROUND STORAGE TANK REMOVAL | STORAGE TANK REMOVAL PROCESS | FUEL TANK REMEDIATION SERVICES | TANK REMOVAL EXPERIENCE.
You can also read one of our case studies here: UST Decommissioning: Fuel Tank Removal on a Busy City Street