Further demolition works are scheduled over the coming weeks at the Hazelwood Rehabilitation Project.
Demolition of Boiler House Four within the former Hazelwood Power Station site is scheduled to be undertaken, subject to favourable weather conditions, by principal contractor Delta Group TODAY Friday 20/11/2020. Updates provided throughout the day.
For more information please download the Notice of Boiler House Demo below.
Demolition works at the former Hazelwood Power Station and Mine are continuing, with an anticipated completion date of 2022. The works are being undertaken by Delta Group, a Victorian-based nationally recognised demolition company.
A team of international technical and demolition experts has been assembled to work with the local workforce and, in consultation with relevant regulators and agencies, to develop and deliver a safe and effective demolition approach.
When will the boiler houses be demolished?
Following the successful controlled collapse of the eight Hazelwood Chimneys in May 2020, the way is clear for the demolition of the boiler houses that were part of the former Hazelwood Power Station. There are four boiler houses, each housing two units.
The team, led by the international subject matter experts, is aiming to demolish boiler houses Stage 4 and Stage 3 by the end of 2020.
The remaining two boiler houses will be demolished in mid to late 2021.
The boiler houses will be demolished one event at a time.
How will they be demolished?
Because of the size and design of the boilers, the safest methodology for demolition is by controlled explosive collapse. This methodology was decided after undertaking engineering and risk evaluations subject to regulatory oversight.
Each of the boiler houses is around 65 metres high and has been constructed using a suspended boiler design. A controlled explosive collapse, similar to the successful chimney controlled collapse earlier this year, means the structures will be safely brought to ground and the material then removed.
Exclusion zones and traffic management
To ensure the safety of the workforce and broader community, a 700 metre exclusion zone will be set up around each stage when demolition takes place.
On the morning of each demolition event, Delta will establish some localised road closures. This includes closure of Brodribb Road between Nadenbousch’s Road and Cemetery Avenue.
Traffic on the Princes Freeway will be slowed to 60 kilometres per hour and traffic controls will be in place to stop vehicles from parking on the side of the carriageway. Traffic will also be slowed to 80 kilometres an hour on the Strzelecki Highway. This is in accordance with the approved traffic management plan.
Other local roads are likely to affected and people should expect some minor delays.
Notice will be provided to local residents and the community prior to each demolition event.
What about asbestos?
Works to identify and remove hazardous materials including asbestos so far as reasonably practicable have been conducted in preparation for the blast felling event.
As with any industrial building constructed when Hazelwood was built, asbestos material was used in various ways. However, following an extensive controlled removal program over the past 16 months, all accessible asbestos within the boiler structures has been removed in accordance with a Division 6 Audit and Asbestos Management Plan.
Through the safety management process developed by Delta and ENGIE Hazelwood, with the oversight of regulators including WorkSafe, it has been identified that there is a minimal amount of residual asbestos remaining, which is fully encased within the steel structure itself.
The explosive charge design has been developed to minimise and mitigate any disturbance of the encased asbestos. As a further mitigation, the Blast Management Plan also makes provision for water suppression through the fell sequence, as successfully demonstrated in the recent controlled chimney collapse.
As each boiler house is demolished, any asbestos-contaminated materials will be removed from the fell zone and transported on internal roads to the EPA-licensed onsite asbestos cell for safe disposal.
Air monitors will be set up at the site boundary locations and surrounding the fell zone, similar to the set up for the controlled chimney fell event, consistent with the requirements of Government approvals.
What about noise?
While controls have been implemented to reduce any external noise emissions as far as possible,local residents are likely to hear a loud noise at the time of the demolition, for a few seconds. This is unavoidable, given the size of the structure, and the nature and placement of the explosive charges necessary to safely effect a controlled collapse.
Weather patterns are expected to play a part, and modelling is being undertaken to identify favourable meteorological conditions that will minimise noise impacts to the extent possible.
The detonation blast pattern has also been designed, through implementation of millisecond charge delays, to reduce noise emissions as far as possible.
Extensive noise, vibration, asbestos and dust monitoring will be implemented throughout the mine licence and in close proximity to neighbouring townships.
What about dust?
The safety of workers and the surrounding communities is the primary concern so the demolition will be carried out when weather conditions are favourable so as to reduce the noise emissions and the dispersion of dust as far as possible.
Further, Delta will install dust mitigation measures around the blast site using a combination of pre-wetting down, and boosted pressure pipe with sprays reaching about 30 metres high around the base of each boiler house.
As the demolition event will only be carried out in favourable weather conditions, it is likely that the date for the demolition of the boilers will only be able to be announced close to demolition.
Consequently, this date could change at any time due to weather with further updates to be provided to regulators and the community.
Do regulatory and other external organisations have a part to play?
Oversight of the planning and safe performance of the works is provided by WorkSafe Victoria and the Environment Protection Authority Victoria (EPA), and also the Independent Building Certifier.
Planning meetings with emergency services stakeholders including Victoria Police, Ambulance, FRV and Regional Roads Victoria have taken place and will continue until the demolition is complete.
Direct stakeholder information is provided to regulatory bodies such as WorkSafe and the EPA.
Where can I find out more?
Information about the demolition works and advice on the dates for demolition is provided via our email database, local media, and direct mail to site neighbours. To join the email database, email email@example.com