5300 GLENWOOD AVE 2017-01-13 - Laserfiche WebLink

• The Overall Risk Rating and Action Thresholds • The Risk Rating is the sum of the three categories a number from 3 to 12 an interpretation of the rating and a discussion of the implications is provided in the Table Appendix One below. Risk Risk lnterpretation and Implications Ratin Cate o 3 Low 1 Insi nificant- no concern at all. 4 Low 2 Insi nificant-ver minor issues. 5 Low 3 Insi nificant-minor issues not of concern for man ears et. 6 Moderate 1 Some issues but nothing that is likely to cause any problems for another 10 ears or more. 7 Moderate 2 Well defined issues-retain and monitor. Not expected to be a problem for at least another 5-10 ears. 8 Moderate 3 Well defined issues-retain and monitor. Not expected to be a problem for at least another 1-5 ears. 9 High 1 The assessed issues have now become very clear. The tree can still reasonably be retained as it is not likely to fall apart right away, but it must now be monitored annually. At this stage it may be reasonable for the risk manager/owner to hold public education sessions to inform people of the issues and prepare them for the reality that part or the entire tree has to be removed. 10 High 2 The assessed issues have now become very clear. The probability of failure is now getting serious, or the target rating and/or site context have changed such that mitigation measures should now be on a schedule with a clearly defined timeline for action. There may still be time to inform the public of the work being planned, but there is not enough time to protracted discussion about whether or not there are alternative o tions available. 11 High 3 The tree or a part of it has reached a stage where it could fail at any time. Action to mitigate the risk is required within weeks rather than months. By this stage there is not time to hold public meetings to discuss the issue. Risk reduction is a clearly defined issue and although the owner may wish to inform the public of the planned work, he/she should et on with it to avoid clearl foreseeable liabilities. 12 Extreme This tree, or apart of it, is in the process of failing. Immediate action is required. All other less significant tree work should be suspended, and roads or work areas should be dosed off, until the risk issues have been mitigated. This might be as simple as removing the critical ,, part, drastically reducing overall tree height, or taking the tree down and cordoning off the area until final clean up, or complete removal can be accomplished. The immediate action required is to ensure that the clearly identified risk of harm is eliminated. For areas hit by severe storms, where many extreme risk trees can occur, drastic pruning and(or partial tree removals, followed by barriers to contain traffic, would be an acceptable first stage of risk reduction. There is no time to inform people or worry about public concerns. Clearly defined safet issues preclude further discussion. Villas at Glenwood Terrace Tree Risk Assessment Robert W. Williams Consulting Arborist 10