Restoration works at Trinity Green Park are scheduled to begin late April, early May 2026. These works will be delivered in stages throughout the financial year, and the plan in the document library highlights the areas where activities will take place in 2026.

What works are happening in 2026?

This year’s works focus on restoring and strengthening the park landscape and include:

• Increasing the depth of the protective surface layer using mulch.
• Distributing native seed to encourage natural regeneration.
• Planting local native tube stock - view plant selections in the document library.
• Ongoing maintenance, including replacing plants that do not establish.
• Targeted weed control before and after planting.

These works will help stabilise slopes, support healthy plant growth and improve the park’s long‑term environmental resilience.

What will Trinity Green Park look like in the future?

The long‑term vision for Trinity Green Park is to create a space that offers something for everyone, including:

• Open grassed areas near the playground for informal play, picnics and community use.
• Increased shade and canopy trees to improve comfort and reduce heat.
• A three‑metre‑wide limestone walking and maintenance path.
• Expanded native bushland areas to support wildlife, provide shade and enhance slope stability.

Improvements will occur gradually, allowing the landscape to establish and improve year by year. View the park visualisation in the document library.

Why these works are needed

During the playground upgrade in 2021, investigations identified material close to the surface that confirmed the site was historically used as landfill. This means additional protective layers (known as ‘capping’) are required to ensure the park is safe and stable. The investigation also confirmed that the existing groundwater reticulation system needs to be decommissioned due to groundwater contamination.

Because of this, park improvements need to be carefully managed and include:

• Adding mulch to increase the depth of the protective layer
• Using bushland‑style planting, particularly on slopes, to prevent erosion and improve stability

While this places some limits on the types of landscaping and infrastructure that can be installed, the City is committed to making Trinity Green Park as safe, attractive and enjoyable as possible for the community.

July 2026 - Groundwater and Underground Gas Monitoring at Trinity Green

The City of Bunbury will be undertaking environmental monitoring works at Trinity Green between Monday 13 July and Friday 17 July 2026 as part of its ongoing management of the site under the Contaminated Sites Act 2003.

These works involve the installation of:

• Three groundwater monitoring wells
• Six underground gas monitoring wells

The information collected will help the City better understand groundwater and underground gas conditions within and around Trinity Green and will support future restoration and improvement works.

What works will be undertaken?

The City will use hand augers (manual drilling tools) and a small drilling rig to install the monitoring wells. Drilling will generally extend to approximately two metres or deeper, depending on groundwater levels. Monitoring locations have been carefully selected to meet environmental monitoring requirements while minimising impacts on residents, trees and surrounding vegetation. Following installation, groundwater and gas sampling will commence and continue every two months over the next 12 months.

Residents may notice:

• A small drilling rig and monitoring equipment
• Temporary fencing around active work areas
• Some noise associated with drilling activities
• Minor vehicle movements related to the works

Works are expected to occur between 7.00am and 5.00pm during the monitoring period.

Safety and environmental management

All ground disturbance and ongoing sampling activities will be undertaken in accordance with the City's approved Asbestos Management Plan and Health and Safety Site Plan. The gas monitoring wells will be sealed and fitted with protective covers to ensure they remain airtight. This will prevent odours from being released and minimise impacts on nearby residents. A map showing the proposed monitoring locations is available in the document library.