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Elements and Performance Criteria
Performance Evidence
An individual demonstrating competency must satisfy all of the elements and performance criteria in this unit.
There must be evidence that the individual has on at least one occasion developed an arboricultural impact assessment report for a development site and has:identified and researched the impact and specific requirements of legislation, Australian Standards, and local government laws for trees on development siteconducted site assessment and identified conditions that impact tree protection programidentified work health and safety hazards, assessed risk and applied controls for siteidentified hazards and assessed the risks that harm treeslocated, confirmed and plotted all trees on survey plancollected plans and documentationidentified and recorded tree by botanical and common name and included a record of:tree height, crown spread and diameter-at-breast-height (DBH), diameter at ground level and statutory dimensionsage class and estimated life expectancytree health in relation to tree physiology and pathologycondition of tree structure in relation to tree anatomyassessed the following values for trees:heritage and culturalhabitat, ecological and environmentallocation of tree to existing and past site structuresdetermined the tree retention valuecompiled tree assessment data for reportrecorded all trees suitable for retentiondetermined and plotted indicative tree protection zone (TPZ), tree identifiers for each tree on survey plandocumented preliminary arboricultural reportinterpreted plans, designs, working drawings, terms, symbols and language for developmentassessed and determined controls for mechanical and chemical damage affecting treesprovided client with preliminary feedback for potential improvementsliaised with client on design development and assessed impact of construction on treesliaised with design team to develop tree sensitive design and construction methodsassessed development requirements for site access and logisticsreviewed indicative tree protection zone and determined:extent of encroachment into indicative TPZ impact of works on structural root zone (SRZ)determined extent of SRZdetermined and recorded level of encroachment and actual TPZ for trees to be retainedassessed the following factors affecting tree viability for a major encroachment:location and distribution of rootspotential loss of root massspecies tolerance to root lossage, health, size, lean and stability of treeassessed impact of encroachment on health, physiology and structural integrity of treeassessed impact on soil characteristics and volume from past, existing or planned structuresconsidered site and design factors to minimise impact of proposed encroachmentrationalised all factors to decide on the viability of the treedetermined remedial measures to protect the treeinvestigated, specified and produced installation and construction drawings for tree protection devices and systems to mitigate tree damageprovided advice to client on tree removal and tree pruning programprepared a draft arboricultural impact assessment report developed a tree protection plan and drawingsprepared, documented tree management and monitoring, including strategies to handle problemsconsolidated reports, plans and guidelines into final arboricultural impact assessment report in both:digital formatprint formatpresented report to client.
Knowledge Evidence
An individual must be able to demonstrate the knowledge required to perform the tasks outlined in the elements and performance criteria of this unit. This includes knowledge of:
legislative and regulatory framework for trees on development sites, including:role of Australian Standards AS2303, AS2223, AS3743, AS4970 and AS4373specific requirements of statutory authoritieslocal government tree protection and preservation regulationsconstruction drawings, plans and documentation, including:types of drawings and plansterms, symbols and language used in developmentversion control of drawings, including revision and issue datesworking and communicating with clients and development design personnelconducting site assessment and conditions that impact tree protection programs, including:development site safety and safe access proceduresplotting trees/tree identifiers onto survey plansnaming and recording tree by botanical and common namemethods for determining tree dimensions, height, crown spread and DBHage class and estimated life expectancytree health in relation to tree physiology and pathologyassessing and determining the viability of a treessoil volume and characteristics on development sitestree values and importance, including:heritage and cultural valueshabitat, ecological valueenvironmental valuesmethods of determining retention valuethe principles of TPZ, including:methods of mechanical and chemical damage to trees on development sitesimpact of proposed development on treesSRZlevels of tolerance to encroachment and potential loss of root massspecies tolerance to root losstype and structure of tree impact assessment reports, including:purpose and structure of preliminary arboricultural reportpurpose and structure of arboricultural assessment reportuse and interpretation of development plans and documentation drawing techniques for illustration in reports and plans, including digital imagestree protection plans and drawingspurpose and structure of tree management and monitoring guidelinespresenting reports in digital or paper-based formatstree protection devices, methods and systems, including:designs and their purposetree response to tree protection systemsinstallation and construction methods for tree protection.