The City of Stirling as part of initial investigations, engaged consulting arborist Paperbark Technologies to undertake a Quantified Tree Risk Assessment (QTRA) to identify health and condition of all trees within the Princess Wallington Community Parkland development area.
The trees identified for removal in the QTRA were reviewed in terms of health, structural integrity and risks associated with public safety. Where identified in the QTRA, further tree pruning and remediation will be undertaken to preserve the remaining trees.
A Tree condition survey has been undertaken as part of the project. The overall aim is to create a net gain in the number of trees located in the parkland area. The aim is to maximise the retention of large shade trees and vegetation such as the grass trees, and to achieve an overall increase in the number of trees in the Reserve.
The more rigid facilities such as the skate facility and car parking will be located in spaces already cleared. The more fluid and flexible infrastructure such as the regional playground will take on the existing natural features and provide a more connected experience.
The Community Parkland design nominates 30 trees for removal as per Attachment 4 - Identified Trees for Removal. Of the trees proposed for removal, seven are dead and a further 17 are in poor health and/or structural condition (and are therefore being removed on safety grounds). The remaining six trees (three Eucalyptus marginata, two Tipuana tipu and one Araucaria columnaris) are proposed for removal to accommodate parking and recreational infrastructure.
The key biophysical design driver identified is the Balga, Xanthorrhoea preissi (the area namesake). 65 grass trees are proposed for removal as part of the design and these grass trees will be transplanted to various areas across the
parkland and Balga suburb.
The material acquired from the tree removal process will be recycled both on and off site. Large logs and tree trunks will be used as nature play elements across the site, particularly in the playground. Some logs will also be donated to local environmental organisations such as Kaarakin Black Cockatoo Rescue and Native Animal Rescue. Remaining material will be mulched, and spread on site in garden beds. To offset the tree removals, City will plant 63 x 45litre trees. These are a mix of Karrakatta South, Central Complex Species and WA Natives will be used in the parkland.
To preserve the area’s namesake tree, the Balga (grass tree), where removal is required the City intends to transplant the affected Balga’s to other areas in the parkland and within the Balga suburb.