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Evidence Guide: AHCARB513 - Examine and assess trees

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

AHCARB513 - Examine and assess trees

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare for tree assessment

  1. Identify scope of survey according to client brief
  2. Select, check and use personal protective equipment
  3. Locate tree and document tree position according to client brief
  4. Identify and record tree species and determine implications on brief
  5. Assess and consider tree health that impacts on brief
  6. Estimate age of tree, tree parts and defects
Identify scope of survey according to client brief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select, check and use personal protective equipment

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Locate tree and document tree position according to client brief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify and record tree species and determine implications on brief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess and consider tree health that impacts on brief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Estimate age of tree, tree parts and defects

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Acquire data for valuation

  1. Determine and record tree dimensions according to client brief
  2. Investigate and assess tree for indicators of habitat and ecological significance
  3. Investigate and assess tree for historical and cultural significance
  4. Investigate statutory controls on tree
  5. Record outcomes of investigation of tree significance and restrictions
  6. Select and compare amenity tree valuation methods
  7. Collect and collate unit values and data required for selected tree valuation methods
  8. Calculate and record amenity value of individual trees
  9. Compare results and account for different values for selected methods
  10. Consider and communicate value of trees captured by amenity valuation
Determine and record tree dimensions according to client brief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and assess tree for indicators of habitat and ecological significance

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and assess tree for historical and cultural significance

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate statutory controls on tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Record outcomes of investigation of tree significance and restrictions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select and compare amenity tree valuation methods

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Collect and collate unit values and data required for selected tree valuation methods

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate and record amenity value of individual trees

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Compare results and account for different values for selected methods

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Consider and communicate value of trees captured by amenity valuation

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Acquire data for tree risk assessment

  1. Assess relationship of tree to potential targets
  2. Inspect tree for visual indicators of likely failure of tree or tree parts
  3. Use basic diagnostic tools to confirm presence and extent of hazards
  4. Assess likely impact of wind loading on potential for failure of tree
  5. Assess hazards and determine likelihood of failure
Assess relationship of tree to potential targets

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Inspect tree for visual indicators of likely failure of tree or tree parts

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use basic diagnostic tools to confirm presence and extent of hazards

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess likely impact of wind loading on potential for failure of tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess hazards and determine likelihood of failure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Undertake tree risk assessment calculations

  1. Select tree risk assessment methods and determine their limitations
  2. Determine target of concern and occupation rate
  3. Determine tree components of concern and their likelihood of failure
  4. Determine likelihood of impact of tree on target
  5. Determine likely consequence of impact of target and tree components
  6. Calculate and document determinations and level of risk according to client brief
Select tree risk assessment methods and determine their limitations

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine target of concern and occupation rate

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine tree components of concern and their likelihood of failure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine likelihood of impact of tree on target

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine likely consequence of impact of target and tree components

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate and document determinations and level of risk according to client brief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Document and communicate tree risk assessment

  1. Provide client with benchmarks and context for risk assessment results
  2. Determine and document potential risk mitigation controls and estimate residual risk of each control
  3. Recommend timeframe for implementation of risk mitigation controls
  4. Recommend follow-up inspection type and timeframe
  5. Consider risk against value of tree
  6. Produce a tree risk assessment report
Provide client with benchmarks and context for risk assessment results

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine and document potential risk mitigation controls and estimate residual risk of each control

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Recommend timeframe for implementation of risk mitigation controls

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Recommend follow-up inspection type and timeframe

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Consider risk against value of tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Produce a tree risk assessment report

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

An individual demonstrating competency must satisfy all of the elements and performance criteria in this unit.

There must be evidence that the individual has examined and assessed at least two different trees, including:

identified scope and purpose of assessment from client brief

selected, checked and used personal protective equipment

located tree and documented position

identified and recorded tree species and determined implication on brief

assessed and considered tree health and impact on brief

estimated age of tree, tree parts and defects

determined and recorded tree dimensions, which must include:

tree height

tree spread

diameter-at-breast-height (DBH)

trunk circumference

diameter at base

investigated, assessed and recorded the following indicators of value:

habitat and ecological significance

historical and cultural significance

statutory controls

selected and compared amenity tree for at least 2 different valuation methods

collected unit values and data required by the valuation method selected

calculated and recorded amenity value of at least 2 different trees

compared results of different valuation methods and accounted for differences

considered and communicated value of trees captured for valuation

inspected tree for visual indicators of likely failure of tree or tree parts

assessed relationship of tree to potential targets

assessed likely impact of wind loading on potential for failure

used basic diagnostic tools to confirm presence and extent of hazards

assessed hazards and determined likelihood of failure

selected tree risk assessment methods and determined their limitations

determined target of concern and occupation rate

determined tree components of concern and their likelihood of failure

determined likelihood of impact and consequence of tree failure on target

calculated and documented determinations and level of risk

provided client with benchmarks and context for risk assessment

determined and documented potential risk mitigation controls and estimated residual risk

recommended timeframes for implementation of risk mitigation controls and follow-up inspections

considered risk against value of tree

produced a tree risk assessment report.

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 assessment

owner/client and address

who requested the assessment

reasons for assessments to be requested

client risk thresholds

data capture procedures

requirements for assessment

tree assessment and measuring equipment

trees and surveying their location on a site, including:

methods for locating trees on devices, drawings, plans or aerial images

techniques to position tree on site from boundaries and structures

tree identification, biology and physiology

assessing tree health, including:

signs and symptoms of disease

methods of detecting decay and structural defects in trees

use of basic diagnostic tools

testing equipment to detect decay, disease and scope of tree problems

factors affecting the likelihood of tree failure

use of diagnostic tools

computations and estimating tree dimensions and their relevance to tree assessment, including:

tree height and spread

trunk circumference

DBH

diameter at ground level

assessing structure and symmetry of the canopy, including:

symmetrical and asymmetrical canopy structure and consequences on tree stability and health

trunk inclination and calculating the lean

impact of wind loading on trees and tree structures

estimating and calculating wind loading

relationship and responsiveness of form of crown to surrounding trees and structures

tree age and health issues and their estimation, including:

uninodal and multinodal tree species as an indicator of age

growth increments, including bud scars, sympodial growth and flush marks

checking age estimations using documented images

valuation methods of amenity trees, including:

a range of tree valuation methods and their application

legal and statutory controls and protection of trees

indicators of habitat use

ecological value and significance

cultural value and significance

historical value and significance

preservation orders and local environmental protection laws

calculating amenity tree value of individual trees

visual tree assessment (VTA) techniques and procedures, including:

visual indications and symptoms of disease and health issues

tests and checking the extent of disease and health issues

assessment of impact of tree disease and health issues on tree safety

the purpose and use of basic diagnostic tools

methods of determining and mitigating levels of risk, including:

a range of tree risk assessment methods and their application

identification and extent of tree hazards

causes of instability, decay, damage and stress in trees

quantification and qualification of tree risk

risk benchmarks from non-arboricultural activities

controls available to mitigate risks

remedial action of tree problems

determining the consequence of risk, including:

why most likely outcomes are used and not worst case

abbreviated injury index/scale

possible targets associated with tree risk, including:

persons, property, interruptions to community activity, interruptions to services

occupation rates

tree assessment reporting procedures, including images.