A preliminary tree assessment (PTA) is a comprehensive survey or assessment of trees within a designated site or parcel of land. These reports are often used in the earliest stages of development planning, prior to the development application (DA) or detailed design. The preliminary tree assessment provides base data and information to guide the layout of the development, including opportunities to retain existing trees.
The first stage of a preliminary tree assessment comprises numbering, tagging, and collecting data for each tree within the site. The second stage of the preliminary tree assessment consists of using the data collected on site in conjunction with a site survey plan to compile a report. General information for each individual tree will include:
- Identification: Allocated number and botanical name.
- Dimensions: Tree height, canopy spread, and trunk diameter at breast height (DBH)
- Condition: Tree health, structure, and age class.
- Significance: Tree significance, useful life expectancy, and priority for retention.
- Protection zones: Tree protection zone (TPZ) and structural root zone (SRZ).
Our preliminary tree assessment report includes a tree location plan prepared using ArcGIS or AutoCAD software. The tree location plan shows the identifying number and location of each tree, the extent of the tree protection zone, and will be colour coded to reflect the retention value of each individual tree (low, medium, and high priority for retention).