OPW25/0012 - Arborist Report & Vegetation Management Plan

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[OCR of page images]
Arborist Report
3 &7 Serenity Close, Noosa Heads

e Tree species and tolerance to root disturbance,

e Age, size and vigor of tree,

e Lean and stability of tree,

e Soil characteristics,

e Drainage characteristics,

e The presence of existing or past structures or obstacles affecting root development,
and,

e Building or infrastructure design methods (e.g. pier and beam, suspended slabs,
cantilevered building sections, screw piles and tunnel-boring of pipes can be used to
reduce the impacts of any encroachment).

‘Encroachment’ of a structure within the TPZ of greater than 10% is not equivalent to
‘impact’, particularly where site, tree or development characteristics are considered. For
example, a timber deck may result in major encroachment, however, is constructed using
methods which avoid disturbance of existing ground levels and structural roots (e.g. low-
pressure vacuum excavation, pier and beam, cantilevering or screw piles) and allow for
natural air circulation and rainfall to the existing ground surface (e.g. uncovered and
spaced timber decks). In these circumstances, the design measures avoid or mitigate the
impact of the encroachment to acceptable or tolerable levels.

A construction footprint, which includes all works required to construct the approved
development (e.g., building footprint, scaffolding, construction routes for vehicles,
earthworks, services installation) has been provided by the project architects and
engineers. The construction footprint is shown in Figure 2.

Assessment of development impacts on the trees were carried out in accordance with AS
4970-2009 (Standards Australia 2009). Impacts on the tree were assessed via the
preparation of scaled GIS drawings which overlaid the surveyed location of the tree and
its associated TPZ and SRZ with the proposed extent of development works.

LTORIAS

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