List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
Element | Performance criteria |
Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. |
1. Determine soil attributes | 1.1 Research repose angle of soil materials 1.2 Research soil plasticity 1.3 Measure soil moisture content and field capacity of soil 1.4 Research the effects of soil moisture on soil cohesion and plasticity 1.5 Research modes of soil liquefaction 1.6 Determine soil texture 1.7 Assess level of soil cohesion 1.8 Determine shear strength of the soil of concern 1.9 Research load bearing capacity of soil of concern 1.10 Determine mass of the soil plate |
2. Determine root attributes | 2.1 Determine root morphology, division and distribution 2.2 Determine amount of buttressing of tree 2.3 Determine species development of tap root system 2.4 Research identifying anatomical features of tree roots 2.5 Identify tree roots based on anatomical features |
3. Calculate forces from roots | 3.1 Research, experimentally model or demonstrate forces and pressures exerted into or through the soil, directly and indirectly by trees 3.2 Estimate and measure dimensions of roots exerting a force on a structure of concern 3.3 Calculate total surface area of the roots exerting a force on a structure of concern 3.4 Calculate force exerted by roots per unit of surface area of structure 3.5 Calculate total force exerted by roots of a given surface area |
4. Determine structure attributes | 4.1 Measure and determine volume of structure of concern 4.2 Research and calculate mass of the structure and adjacent structures 4.3 Consider the impact of gravity on mass 4.4 Determine affect of leverage on the forces exerted by tree roots onto structure of concern |
5. Define the root-soil matrix factors for root/soil breakage | 5.1 Determine factors of root–soil matrix interactions 5.2 Consider area of contact between root and soil 5.3 Consider elasticity, tensile strength and breaking stress of roots 5.4 Investigate root cross-sectional morphology 5.5 Assess extent of root plate damage, deficiencies or defects 5.6 Estimate impact of static and dynamic testing for root plate stability 5.7 Evaluate the likelihood of root failure by root breakage 5.8 Evaluate the likelihood of anchorage failure by soil breakage or slippage |
6. Research structural engineering solutions | 6.1 Research and consider effects of increasing mass 6.2 Research and consider methods for, and effects of, increasing the modus of rupture 6.3 Research and consider effects of use of curved structures 6.4 Research and consider effects of soil mass and friction 6.5 Research and consider effects of use of anchors, braces and props 6.6 Compile a portfolio of above research including personal annotations and calculations |
7. Prepare stability and expert witness reports | 7.1 Prepare report on likelihood of tree causing damage to structure of concern including all test results, assumptions and calculations 7.2 Provide design suggestions to mitigate likelihood of damage to a similar replacement structure 7.3 Prepare report on relative stability of tree as a result of a defective or damaged root plate 7.4 Provide design suggestions to mitigate likelihood of whole tree failure as a result of defective or damaged root plate 7.5 Prepare expert witness report on harm by roots on structures; or on stability of tree with a defective or damaged root plate, as required |
8. Facilitate teamwork | 8.1 Review construction and engineering language terminology 8.2 Discuss installation and protection measures to non-arboricultural project personnel 8.3 Resolve issues in construction and engineering terminology 8.4 Communicate in the language, concepts, basic science and technology of construction, architecture and engineering allied professions |
The candidate must be assessed on their ability to integrate and apply the performance requirements of this unit in a workplace setting. Performance must be demonstrated consistently over time and in a suitable range of contexts.
The candidate must provide evidence for and demonstrate:
researching repose angle of soil materials
researching soil plasticity
measuring soil moisture content and field capacity of soil
researching the effects of soil moisture on soil cohesion and plasticity
researching modes of soil liquefaction
determining soil texture
assessing level of soil cohesion
determining shear strength of the soil of concern
researching load bearing capacity of soil of concern
determining mass of the soil plate
determining root morphology, division and distribution
determining amount of buttressing of tree
determining species development of tap root system
researching identifying anatomical features of tree roots
identifying tree roots based on anatomical features
researching, experimentally modelling or demonstrating forces and pressures exerted into or through the soil, directly and indirectly by trees
estimating and measuring dimensions of roots exerting a force on a structure of concern
calculating total surface area of the roots exerting a force on a structure of concern
calculating force exerted by roots per unit of surface area of structure
calculating total force exerted by roots of a given surface area
measuring and determine volume of structure of concern
researching and calculate mass of the structure and adjacent structures
considering the impact of gravity on mass
determining affect of leverage on the forces exerted by tree roots onto structure of concern
determining factors of root–soil matrix interactions
considering area of contact between root and soil
considering elasticity, tensile strength and breaking stress of roots
investigating root cross-sectional morphology
assessing extent of root plate damage, deficiencies or defects
estimating impact of static and dynamic testing for root plate stability
evaluating the likelihood of root failure by root breakage
evaluating the likelihood of anchorage failure by soil breakage or slippage
researching and considering effects of increasing mass
researching and considering methods for, and effects of, increasing the modus of rupture
researching and considering effects of use of curved structures
researching and considering effects of soil mass and friction
researching and considering effects of use of anchors, braces and props
compiling a portfolio of above research including personal annotations and calculations
preparing report on likelihood of tree causing damage to structure of concern including all test results, assumptions and calculations
providing design suggestions to mitigate likelihood of damage to a similar replacement structure
preparing report on relative stability of tree as a result of a defective or damaged root plate
providing design suggestions to mitigate likelihood of whole tree failure as a result of defective or damaged root plate
preparing expert witness report on harm by roots on structures; or on stability of tree with a defective or damaged root plate, as required
reviewing construction and engineering language terminology
discussing installation and protection measures to non-arboricultural team members
resolving issues in construction and engineering terminology
communicating in the language, concepts, basic science and technology of construction, architecture and engineering allied professions.
The candidate must demonstrate knowledge of:
repose angle of soil materials
soil plasticity
soil moisture content
field capacity of soil
effects of soil moisture on soil cohesion and plasticity
modes of soil liquefaction
soil texture
soil cohesion
shear strength of the soil
load bearing capacity
mass of soil plate
root morphology
root division
root distribution
buttressing
species development of tap root systems
anatomical features of tree roots
identification of tree roots based on anatomical features
research, experimental modelling and demonstration methods
forces and pressures exerted into or through the soil, directly and indirectly by trees
estimation and measurement of dimensions of roots exerting a force on a structure
calculation of the total surface area of the roots exerting a force on a structure
calculation of the force exerted by roots per unit of surface area of structure
calculation of the total force exerted by roots of a given surface area
measurement of volume of structures
calculation of the mass of structures
impact of gravity on mass
affect of leverage on the forces exerted by tree roots onto structure
factors of root–soil matrix interactions
area of contact between root and soil
elasticity of roots
tensile strength of roots
breaking stress of roots
root cross-sectional morphology
extent of root plate damage
extent of root plate deficiencies
extent of root plate defects
impact of static and dynamic testing for root plate stability
likelihood of root failure by root breakage
likelihood of anchorage failure by soil breakage or slippage
effects of increasing mass
effects of use of curved structures
effects of soil mass and friction
effects of, increasing the modus of rupture
effects of use of anchors, braces and props
portfolio of research
personal annotations and calculations
report preparation
test results and assumptions
relative stability of tree
whole tree failure
design suggestions for mitigation of damage and whole tree failure
harm by roots on structures
expert witness reports
expert witness report on harm by roots on structures
construction language terminology
engineering language terminology
installation and protection measures
concepts, basic science and technology of structural engineering
concepts, basic science and technology of construction
concepts, basic science and technology of architecture.