arborist · OPW22/0299

                                                                                Consult Arborist

9.6 RESTRICTED ACTIVITIES WITHIN THE TPZ
Restricted activities within the TPZ that would cause harm to the retained trees include, but
are not limited to:
    • Any non-approved construction works, excavation, or cultivation of the ground.
    • Any non-approved storage.
    • Dumping of waste or placement of Fill.
    • Any non-approved soil level changes.
    • Parking of vehicles and plant.
    • Preparation of chemicals, including cement products.
    • Wash down and cleaning of equipment.
    • Refuelling.
    • Temporary or permanent installation of utilities and signs.
    • Lighting fires.
    • Physical damage to the tree.

9.7 TPZ STANDARD MITIGATION MEASURES
Remediation measures can be undertaken to limit and reduce negative effects that may occur.
Where suitable, the retained trees’ TPZ areas should be improved to provide a more
favourable and beneficial growing environment for tree roots. Use sandy loam where raised
soil levels are required to improve drainage and allow gaseous exchange. Trees can adapt to
low levels of Fill over the existing ground if undertaken with the correct material and in some
circumstances, this additional medium can provide ideal rooting conditions for feeder roots
and a beneficial food source for the tree.

The following recommendations, if followed, should improve an existing plant’s vigour, and in
turn benefit the plant’s health, safety, and amenity value. These can be incorporated into the
project landscaping details.

Implement the following where groundworks are carried out adjacent to, or encroach into, the
TPZ areas if deemed appropriate by Consult Arborist:
 • The Project Arborist is to advise and oversee mitigation works to retained trees.
 • Where possible the excavated ground, including the cut roots, will be covered/backfilled
    with quality topsoil locally sourced or a sandy loam/river sand with low organic matter, as
    guided by AS 4419—2003. Australian Standard™ Soils for landscaping and garden use.
 • Monthly applications of a seaweed-based soil conditioner/plant food to the topsoil as per
    the manufacturer’s guidelines for the duration of the project.
 • Install/use ground protection measures when access to the TPZ is required to undertake
    construction works. All ground protection measures are to be discussed and agreed upon
    with the Project Arborist prior to installation. These are to include but are not limited to:
    ply sheets; geo fabric; thick mulch layer.
 • Supplementary watering (water cart or sprinkler system) to retain adequate moisture
    levels in the soil.

All tree works, and tree protection measures, are to be guided by industry best practices and
the relative Australian Standards which include but are not limited to:
 • Australian Standards AS4970-2009 Protection of trees on development sites
 • Australian Standards AS4373-2007 Pruning of amenity trees



22_10_31_AIA_Markbain_Natasha Katharina                                              Page 19 of 26