RFI - 25_06_23_AIA_ SLa_3 Allambi Rise_V2

9.4     SITE PREPARATION
When the final design is agreed upon and the areas for tree protection are established, Site
Preparation is to be undertaken.

One of the key elements of tree preservation is to ensure that the ground around the tree is
unharmed and/or improved. Poor soil conditions will cause a slow death to trees over many
years. The effects on the health of the tree of soil compaction caused by site traffic, storage
of materials and other factors are often underestimated.

Protecting the surrounding ground in which a tree grows is key. Trees naturally grow in shaded
forests with tree debris covering the ground. Trees that grow in grass with compacted and
depleted soil will not be as healthy as trees growing in mulched garden beds. Placing mulch
over the tree protection area will assist in improving the soil conditions and encourage
beneficial soil life while discouraging access.

•     Trees for removal will be clearly marked by the Project Arborist.
•     Trees requiring work will be clearly marked by the Project Arborist.
•     Remove unwanted plants by hand within the Tree Protection Zone; no grubbing of stumps
      and roots.
•     Remove permitted trees – cross-check with the approved plans and the markings by the
      Project Arborist – If in Doubt, Shout Out!
•     Undertake any agreed pruning on the grounds of safety, canopy/structural improvements,
      or to prevent conflict during the works, under the supervision of the Project Arborist in
      accordance with the AS 4373 – 2007 Pruning of amenity trees.
•     Apply organic seaweed-based plant food and soil conditioner.
•     Where possible cover with 50-100mm of composed forest mulch (not any form of Pine
      bark or chip). Site mulch can be used where it does not contain weed species seeds.
•     When required, supplemental watering with a water cart or sprinkler system can be used
      to retain adequate moisture levels in the soil.
•     Install TPZ fencing and signs on the agreed alignments under the supervision of the
      Project Arborist.
•     Do not adjust the TPZ fencing without permission.

9.5     TREE CLEARING PROCEDURES
•     The construction footprint is to be pegged as early as possible, with detailed surveying
      plans clearly delineating the extent of clearing and individual trees/vegetation to be
      retained.
•     Before clearing, tree numbers must be cross-checked with the retention/removal plans.
•     Retained trees will be fenced in accordance with the procedures outlined.
•     When removing trees, all care is to be taken not to damage or otherwise harm retained
      trees.
•     Mulch woody weed species only if they are free from any form of seeds during the time of
      works; remove arisings off-site if trees are seed-bearing.
•     Where practical, retain and process cleared vegetation through a mechanical chipper for
      redistribution on site as organic mulch; the stockpile location is to be situated away from
      retained trees and drainage courses for future distribution.




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