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Tree Report. December 7, 2020. <br />Hidden Canyon (Lester property). Ponderosa Homes. <br />HortScience I Bartlett Consulting <br />Page 5 <br />• Monterey pine #72 was 15" in diameter and in fair condition. <br />• Scots pine #79 was 11" in diameter and in fair condition. <br />• Silk tree "#69 was 16" in diameter and in good condition. <br />■ Willow #65 had 2 stems that arose from a failed tree. It was in poor condition. <br />The City of Pleasanton defines a Heritage tree as having a trunk diameter of 18" or <br />greater or a height of 35' or more. For trees with more than one stem, trunk diameter is <br />determined by adding together the 2 largest stems. Using these criteria, I determined <br />there to be 95 Heritage trees including 42 coast live oaks, 23 Calif. bays, 1 O big leaf <br />maples, blue gums #39, 40, 56; Calif. black walnuts #11, 58, 61; valley oaks #18, 53, 54; <br />apple #70, 84; tree of heaven #151, 154; black locust #87, Calif. buckeye #197, Calif. <br />incense cedar #7 4, elderberry #83, fig #78, Mexican fan palm #55 and willow #65. <br />Description of individual trees is found on the enclosed Tree Assessment Form. Tree <br />locations are found on the Tree Assessment Plan. Both are included as Attachments. <br />Suitability for Preservation <br />Trees that are preserved on development sites must be carefully selected to make sure <br />that they may survive development impacts, adapt to a new environment and perform <br />well in the landscape. Our goal is to identify trees that have the potential for long-term <br />health, structural stability and longevity. Evaluation of suitability for preservation <br />considers several factors: <br />• Tree health <br />Healthy, vigorous trees are better able to tolerate impacts such as root injury, <br />demolition of existing structures, changes in soil grade and moisture, and soil <br />compaction than are non-vigorous trees. <br />■ Structural integrity <br />Trees with significant amounts of wood decay and other structural defects that <br />cannot be corrected are likely to fail. Such trees should not be preserved in <br />areas where damage to people or property is likely. <br />■ Species response <br />There is a wide variation in the response of individual species to construction <br />impacts and changes in the environment. In our experience, for example, <br />Monterey pine, Calif. bay, and blue gum are very sensitive to construction <br />impacts: while coast live oak is more tolerant of site disturbance. <br />• Tree age and longevity <br />Old trees, while having significant emotional and aesthetic appeal, have limited <br />physiological capacity to adjust to an altered environment. Young trees are <br />better able to generate new tissue and respond to change.