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Elements and Performance Criteria
Range Statement
Performance Evidence
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 materialsresearching soil plasticitymeasuring soil moisture content and field capacity of soilresearching the effects of soil moisture on soil cohesion and plasticity researching modes of soil liquefactiondetermining soil textureassessing level of soil cohesiondetermining shear strength of the soil of concernresearching load bearing capacity of soil of concerndetermining mass of the soil platedetermining root morphology, division and distributiondetermining amount of buttressing of treedetermining species development of tap root systemresearching identifying anatomical features of tree rootsidentifying tree roots based on anatomical featuresresearching, experimentally modelling or demonstrating forces and pressures exerted into or through the soil, directly and indirectly by treesestimating and measuring dimensions of roots exerting a force on a structure of concerncalculating total surface area of the roots exerting a force on a structure of concerncalculating force exerted by roots per unit of surface area of structurecalculating total force exerted by roots of a given surface areameasuring and determine volume of structure of concern researching and calculate mass of the structure and adjacent structuresconsidering the impact of gravity on massdetermining affect of leverage on the forces exerted by tree roots onto structure of concerndetermining factors of root–soil matrix interactionsconsidering area of contact between root and soilconsidering elasticity, tensile strength and breaking stress of rootsinvestigating root cross-sectional morphologyassessing extent of root plate damage, deficiencies or defectsestimating impact of static and dynamic testing for root plate stabilityevaluating the likelihood of root failure by root breakageevaluating the likelihood of anchorage failure by soil breakage or slippageresearching and considering effects of increasing massresearching and considering methods for, and effects of, increasing the modus of ruptureresearching and considering effects of use of curved structuresresearching and considering effects of soil mass and frictionresearching and considering effects of use of anchors, braces and propscompiling a portfolio of above research including personal annotations and calculationspreparing report on likelihood of tree causing damage to structure of concern including all test results, assumptions and calculationsproviding design suggestions to mitigate likelihood of damage to a similar replacement structurepreparing report on relative stability of tree as a result of a defective or damaged root plateproviding design suggestions to mitigate likelihood of whole tree failure as a result of defective or damaged root platepreparing expert witness report on harm by roots on structures; or on stability of tree with a defective or damaged root plate, as requiredreviewing construction and engineering language terminology discussing installation and protection measures to non-arboricultural team membersresolving issues in construction and engineering terminologycommunicating in the language, concepts, basic science and technology of construction, architecture and engineering allied professions.
Knowledge Evidence