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• a height between 60' and 100' before becoming senescent, losing vitality and dying back. As a species Alder is also prone to decay and does not compartmentalize (wall of� decay well. When an Alder is wounded the decay associated with the wound can pr�pagate easily through the trunk of the tree with little resistance, causing degradation of wood strength and ultimately leading to tree failure. While these characteristics make Alder an asset in terms of initiating environmental improvement and habitat building, the very same traits are problematic where Alder are growing in close proximity to residences and populated places. Risk Assessment The assessment of risk in trees involves taking the information gathered during the Tree Inspection phase to determine a probability that all or part of a tree will break or fail. In assessing risk, two other components must also be evaluated. The method is outlined in the manual; Tree Risk Assessment in Urban Areas and the Urban Rural Interface. The manual forms the basis of the Tree Risk Assessment Course and Certification process. Tree Risk Assessment is used to identify hazardous situations before damage or injury occurs. Risk Assessment is also used to facilitate risk management specifically to manage the risk associated with the retention of trees, using cultural practices to maintain the risk at an acceptable level. Risk Assessments are undertaken periodically as a matter of due diligence to meet a standard of care. The method assesses three components and attached a numeric value: • Probability of Failure (1-5 points) • Size of the Defective Part (1-3 points) • The presence and rate of occupation of a target (1-4 points) Each of the three categories has been given a rating based on an assessment of a multiplicity of factors in each component. Villas at Glenwood Terrace Tree Risk Assessment Robert W. Williams Consulting Arborist 6