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Elements and Performance Criteria
Performance Evidence
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:
areas to address in a client brief and developing the scope of assessment, including:purpose of assessmentowner/client and addresswho requested the assessmentreasons for assessments to be requestedclient risk thresholdsdata capture proceduresrequirements for assessmenttree assessment and measuring equipmenttrees and surveying their location on a site, including:methods for locating trees on devices, drawings, plans or aerial imagestechniques to position tree on site from boundaries and structurestree identification, biology and physiologyassessing tree health, including:signs and symptoms of diseasemethods of detecting decay and structural defects in treesuse of basic diagnostic toolstesting equipment to detect decay, disease and scope of tree problemsfactors affecting the likelihood of tree failureuse of diagnostic toolscomputations and estimating tree dimensions and their relevance to tree assessment, including:tree height and spreadtrunk circumferenceDBHdiameter at ground level assessing structure and symmetry of the canopy, including:symmetrical and asymmetrical canopy structure and consequences on tree stability and healthtrunk inclination and calculating the leanimpact of wind loading on trees and tree structuresestimating and calculating wind loadingrelationship and responsiveness of form of crown to surrounding trees and structurestree age and health issues and their estimation, including:uninodal and multinodal tree species as an indicator of agegrowth increments, including bud scars, sympodial growth and flush markschecking age estimations using documented imagesvaluation methods of amenity trees, including:a range of tree valuation methods and their applicationlegal and statutory controls and protection of treesindicators of habitat useecological value and significancecultural value and significancehistorical value and significancepreservation orders and local environmental protection lawscalculating amenity tree value of individual treesvisual tree assessment (VTA) techniques and procedures, including:visual indications and symptoms of disease and health issuestests and checking the extent of disease and health issuesassessment of impact of tree disease and health issues on tree safety the purpose and use of basic diagnostic toolsmethods of determining and mitigating levels of risk, including:a range of tree risk assessment methods and their applicationidentification and extent of tree hazardscauses of instability, decay, damage and stress in treesquantification and qualification of tree riskrisk benchmarks from non-arboricultural activitiescontrols available to mitigate risksremedial action of tree problemsdetermining the consequence of risk, including:why most likely outcomes are used and not worst caseabbreviated injury index/scalepossible targets associated with tree risk, including: persons, property, interruptions to community activity, interruptions to servicesoccupation ratestree assessment reporting procedures, including images.