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Tree Report, 218 Ray Street, Pleasanton Ed Brennan, Consulting Arborist
<br /> February 12, 2020 Page 3
<br /> Table 3: Tree Dripline Measurements
<br /> Tree No. Species Trunk diameter Dripline Measurements (feet)
<br /> (inches) North South East West
<br /> 1 Bradford pear 11 8' 6' 8' 8'
<br /> 2 Bradford pear 7 7' 5' 7' 8'
<br /> 3 Bradford pear 6 4' 5' 6' 4'
<br /> 4 Bradford pear 9 9' 8' 9' 8'
<br /> 5 Bradford pear 10 12' 11' 11' 9'
<br /> 6 Valley oak 6 4' 5' 0' 5'
<br /> 7 Pecan 25 27' 21' 25' 24'
<br /> Suitability for Preservation
<br /> Before evaluating the impacts that will occur during development, it is important to consider
<br /> the quality of the tree resource itself, and the potential for individual trees to function well over
<br /> an extended length of time. Trees that are preserved on development sites must be carefully
<br /> selected to make sure that they may survive development impacts, adapt to a new
<br /> environment and perform well in the landscape.
<br /> My goal is to identify trees that have the potential for long-term health, structural stability and
<br /> longevity. For trees growing in open fields, away from areas where people and property are
<br /> present, structural defects and/or poor health presents a low risk of damage or injury if they
<br /> fail. However, we must be concerned about safety in use areas. Therefore, where
<br /> development encroaches into existing plantings, we must consider their structural stability as
<br /> well as their potential to grow and thrive in a new environment. Where development will not
<br /> occur, the normal life cycles of decline, structural failure and death should be allowed to
<br /> continue.
<br /> Evaluation of suitability for preservation 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 cannot
<br /> be corrected are likely to fail. Such trees should not be preserved in areas where
<br /> damage to people or property is likely.
<br /> • Species response
<br /> There is a wide variation in the response of individual species to construction impacts
<br /> and changes in the environment. In our experience, for example, Calif. black walnut
<br /> is sensitive to construction impacts, while coast is 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 better
<br /> able to generate new tissue and respond to change. The potential longevity of the
<br /> Monterey pines is low because of the mature age and infection with pitch canker.
<br /> generally are unsuited for use areas.
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<br /> Planning Division
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<br /> 0 4110 820 Feet l August 17,2ozo ['L-EA AN foN.
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