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

Seahaven Development Pty Ltd- 9-19 Hastings Street Noosa QLD 4567 8

 

 

5.1

In general ficld experience on construction sites has shown that the distances
under Matheny & Clark and British Standards may be reduced under the
following circumstances, if the remaining protection zone may be increased
and the reduction in protection zone doesn’t go closer than the critical
root zone. If only one third of the tree protection zonc is to be impacted on,
then the distance may be reduced by one third (BS 5837:1991, 7.5.5, page 9),
for example 7.2 metres may be reduced to 4.8 metres.

If only one quarter of the tree protection zone is to be impacted on, then the
distance may be reduced by one half or to critical root zone, for example 7.2
metres may be reduced to 3.6 metres or 3 metres in the case of Tree No 48.
‘This scenario on the site maybe achieved due to the undisturbed nature of the
remaining RPA on the council reserve, and the already limiting factor of the in
ground pool to the southeast.

Conclusions

Retainable Trees and the proposed development

Given the impacts on root-distribution for Trees No 57 and 70, and the lack of

further impacts from the proposed development and its underground carpark,

both trees maybe retained with minimum effort and no major affects on health : “e
and structure (if properly protected prior, during and after development

construction).

Tree No 48 will have impacts down to its critical root zone, but not within it,
for an arca consisting of approximately 60° of its RPA circle. Given that this
spccics has a good tolerance to root disturbance and that the remaining 300° of
its‘RPA circle will not-bé impacted on within 7.2 metres of the trunk (see
attached plan showing impact, area), retention is possible if proper protection
and rémedial ; actions are. undertaken prior, during and after development
Construction. Some minor ‘disturbance will occur between 7 & 7.2 metres
from the trunk on the south and northwest comers where the underground
carpark will be.

‘The deck and wall construction within the required tree protection fencing, as
per attached diagram that shows the location of TPF, should be constructed

using pier and beam methods. The site arborist as per the tree protection and
management plan of this report should supervise all picr foundations for this.

All other trees and monocots on the council reserve maybe retained with
appropriate protection measures. .

 

 

Leaf and Limb Horticultural ConsultancyG
Prepared by Samuel Cowie 29" of January 2009