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Tree Report, 218 Ray Street, Pleasanton Ed Brennan, Consulting Arborist
<br /> February 12, 2020 Page 4
<br /> Each tree was rated for suitability for preservation based upon its age, health, structural
<br /> condition and ability to safely coexist within a development environment (see Tree Survey for
<br /> suitability ratings for individual trees).
<br /> Table 4: Tree Suitability for Preservation
<br /> Good These are trees with good health and structural stability that have the
<br /> potential for longevity at the site. Four trees were rated as good in
<br /> suitability for preservation, two Bradford pears (trees#2& 3), the valley
<br /> oak (tree#6), and the pecan (tree#7).
<br /> Moderate Trees in this category have fair health and/or structural defects that may
<br /> be abated with treatment. Trees in this category require more intense
<br /> management and monitoring, and may have shorter life-spans than
<br /> those in the "good" category. Three trees were rated as moderate in
<br /> suitability for preservation, all Bradford pears (trees#1,4 & 5).
<br /> Poor Trees in this category are in poor health or have significant defects in
<br /> structure that cannot be abated with treatment. These trees can be
<br /> expected to decline regardless of management. The species or
<br /> individual tree may possess either characteristics that are undesirable in
<br /> landscape settings or be unsuited for use areas. No trees were included
<br /> in this category.
<br /> Evaluation of Impacts and Recommendations for Preservation
<br /> Appropriate tree retention develops a practical match between the location and intensity of
<br /> construction activities and the quality and health of trees. The Tree Survey was the
<br /> reference point for tree condition and quality. Potential impacts from construction were
<br /> evaluated using the Topographic Survey, Sheet 1, provided by Alexander and Associates.
<br /> The Topographic Survey also shows the placement of the proposed building at the rear of the
<br /> lot.
<br /> My evaluation of the plan indicates that six of the seven surveyed trees could be preserved
<br /> on the site. The only tree requiring removal to implement the proposed building is tree#5, a
<br /> 10' diameter Bradford pear. Preservation of the other six trees is predicated on the Tree
<br /> Preservation Guidelines that follow.
<br />e 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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