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STATUS OF THE URBAN FOREST (PUBLIC AND PRIVATE TREES) <br />Table 2-9. DSH Distributions in the Pleasanton Inventory <br />Young <br />7-18 <br />12,144 <br />51% <br />30% <br />Middle-aged <br />19-24 <br />2,740 <br />12% <br />20% <br />Mature <br />25+ <br />2,219 <br />9% <br />10% <br />Source: City of Pleasanton Tree Inventory (Dudek 2024); Richards 1983. <br />2.7 Tree Condition and Relative Performance Index <br />Trees that are healthy with good trunk and branch structure <br />generally have a lower risk of failure and contribute to a safer <br />City. To determine tree condition, arborists conducting the <br />City's tree inventory rated trees on a scale based on visible <br />characteristics of health condition and canopy structure <br />(Table 2-10). Pursuant to the Council of Tree and Landscape <br />Appraisers' "Guide for Plant Appraisal," tree health and <br />structure were evaluated with respect to five distinct tree <br />components: roots, trunk, scaffold branches, small branches, <br />and foliage. Each component of the tree was assessed <br />with regard to health factors such as insect or pathogen <br />damage, mechanical damage, presence of decay, presence <br />of wilted or dead leaves, and wound closure. Tree health <br />and structure were graded as good, fair, poor, critical, or <br />dead, with good representing no apparent problems and <br />dead representing a dying or dead tree. Good condition <br />trees exhibit acceptable vigor, healthy foliage, and adequate <br />structure and lack any major maladies. Fair condition trees <br />typically have few maladies but declining vigor. Trees in <br />poor and critical condition exhibit declining vigor, unhealthy <br />foliage, poor branch structure, and excessive lean. This <br />method of tree condition rating is comprehensive and results <br />in ratings that are useful for determining the status of trees <br />based on common urban forestry standards. <br />CITY OF PLEASANTON URBAN FOREST MASTER PLAN 1 133 <br />