08/1787 - Response to Information Request [As Published] · 132008.1787

 

Seahaven Development Pty Ltd- 9-19 Hastings Street Noosa QLD 4567 6

 

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Proposed Development Impacts is
Assessment of development and construction impacts was donc using the r
Lower Ground Plan and Pedium Plan by Arkhefield (Dated the 22"! of
January 2009).

Tree No 70 will have the existing limitations on its root distribution (stairwell)
removed and replaced with a stairwell in the southeast side from the tree, and a
walkway coming through from Hastings Street. It is assumed a boardwalk

will extend across to the existing boardwalk above the beach, most likely
consistent in construction to the existing timber boardwalk in the council
reserve (on ground with no significant foundations).

Tree No 57 will have the existing in ground pool removed and replaced with
underground carparking, therefore no major impacts will occur on the already
existing root distribution in close proximity (3.5 metres) to the trunk.

Tree No 48 will have underground carparking impacting on its root system at a
minimum distance of 3 metres from the trunk. Measurement of construction
impacts within the calculated root protection area (RPA) of 7.2 metres found
that 60 degrees of the RPA would be affected. Root impacts will be on.the
compression side of the trunk based on prevailing winds and protection from
the south, sotithwest and southeast. This is also the side where the existing
pool is located on.

Discussion

Tree Root Development

Based on the rescarch conducted, the majority of a trees root system will occur

in the top metre of soil (Perry 1982, page 198). The major woody roots

(25mm to >300mm in diameter) of a tree will radiate horizontally through the

top 200 to 300mm of Soil, and have a distinct swelling or buttressing of the

trunk where they attach (Petry 1982, page 201), as seen in tree No 48 and 57.

In situations with sandy soils, roots will develop deeper into the top 1 metre of :
soil, and also develop sinker roots that look for moisture deeper within the soil *
strata.

These major woody roots will decrease in diameter between | to 4 metres
from the trunk before forming an extensive network of roots 10 to 25mm in ,}
diameter, The larger the tree, then subsequently the larger the distance that the .
major woody roots will extend from the trunk, before forming into rope roots. o
Roots are opportunistic in nature, only growing where adequate supplies of
water, nutrients and oxygen afc available.

Tree Protection Methods and Roots

Tree protection involves the minimising of damage to the tree’s root and oF
vascular system during activities such as construction of installation of root
barriers, thus reducing the chance of tree health decline or death, and the
possible damage to the structural stability of the tree from root damage.
Failure to maintain a minimum tree protection zone may result in declining
long term vigour, health and structural stability in a tree on a construction site.

 

 

Leaf and Limb Horticultural Consultancy® 1 €
Prepared by Samuel Cowie 29" of January 2009 pa?