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5 <br />3 – Frequent use, secondary structure (e.g. seasonal camp area, <br />storage facilities, playgrounds). <br /> <br />4 – Constant use, facilities (e.g. year round use for a number of hours <br />each day). <br /> <br />Hazard Abatement <br />A hazard rating defines the seriousness and extent of potential danger to site <br />users. The greater the hazard rating, the greater the risk associated with the tree. <br />Hazard ratings become a way to prioritize workloads. Trees with high hazard <br />ratings should be treated before trees with low ratings. However, hazard ratings <br />cannot strictly define a numerical line for action, between either removal and <br />retention, or treatment. <br />Development of abatement options should be as systematic as development of <br />the ratings, considering the nature of the site, tree and target. Treatment of <br />hazard situations is framed by the nature of the individual situation. For example, <br />trees in imminent danger of failure and targets that cannot be moved restrict the <br />range of possible abatement options. <br />Treatment of tree hazards must reflect the overall rating and the individual <br />components of the rating, within the program framework. Hazards which result <br />from deadwood and hangers in the crown can be abated by crown cleaning. <br />Alternatively, cable bracing may be required when the most likely failure is that of <br />large scaffolds. Where the hazard is posed by a tree in decline, there may be few <br />abatement options and removal may be the only option. After the treatments <br />have been applied, a follow-up evaluation should occur. <br />561