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Arborist Report. 4400 Black Ave. Pleasanton. Page 5 The True Life Companies May 2023 HortScience | Bartlett Consulting, Divisions of The F. A. Bartlett Tree Expert Company City of Pleasanton Tree Ordinance The City of Pleasanton Municipal Code Chapter 17.16 protects trees with a circumference of 55 inches or more (18 inch diameter) at 4.5 feet above ground level. Multi-trunked trees are protected when the two largest trunks have a circumference of 55 inches (18 inch diameter) at 4.5 feet above ground level. Trees 35 feet or taller and street trees of any size are also protected. Based on this definition, 25 Heritage trees and 2 street trees were included in this assessment. Heritage and street trees cannot be removed without a permit. The protected status of individual trees is identified in the Tree Assessment (see Attachments). Suitability for Preservation Before evaluating the impacts that will occur during development, it is important to consider the quality of the tree resource itself, and the potential for individual trees to function well over an extended length of time. Trees that are preserved on development sites must be carefully selected to make sure that they may survive development impacts, adapt to a new environment and perform well in the landscape. Our goal is to identify trees that have the potential for long- term health, structural stability, and longevity within the proposed development. Evaluation of suitability for preservation considers several factors:  Tree health Healthy, vigorous trees are better able to tolerate impacts such as root injury, demolition of existing structures, changes in soil grade and moisture, and soil compaction than are non-vigorous trees. For example, coast redwoods with a full healthy crown will tolerate impacts from construction better than redwoods that are drought stressed.  Structural integrity Trees with significant amounts of wood decay and other structural defects that cannot be corrected are likely to fail. Such trees should not be preserved in areas where damage to people or property is likely. For example, evergreen pear #13 had basal decay and is not a good candidate for preservation.  Species response There is a wide variation in the response of individual species to construction impacts and changes in the environment. Coast redwood, and London plane are tolerant of root severance and general construction impacts while southern magnolia is intolerant. Callery pear and valley oak are moderate in response.  Tree age and longevity Old trees, while having significant emotional and aesthetic appeal, have limited physiological capacity to adjust to an altered environment. Young to semi-mature valley oaks would be better able to generate new tissue and to respond to change than mature oak #28.  Invasiveness Species that spread across a site and displace desired vegetation are not always appropriate for retention. This is particularly true when indigenous species are displaced. The California Invasive Plant Inventory Database (http://www.cal-ipc.org/paf/) lists species identified as being invasive. Pleasanton is part of the Central West Floristic Province. Of the assessed species, glossy privet is listed as having limited invasiveness.