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Arborist Report—Gudaitis Residence, Pleasanton Page 5
<br /> January 19, 2021
<br /> Photo 5 (right)—Coast t
<br /> redwood#85 in centerX ,;�-�
<br /> (tallest tree), flanked by ti '" krkt;�f i �;
<br /> coast redwood#71 to r
<br /> right and valley oak#70 t �`
<br /> (deciduous tree at right).
<br /> Coast live oak#89
<br /> (yellow arrow)is in
<br /> background near , •`
<br /> Sycamore Road. 4. nt.:,
<br /> I.
<br /> Suitability for Preservation
<br /> Before evaluating the impacts that will occur during development, it is important to consider the
<br /> quality of the tree resource itself and the potential for individual trees to function well over an
<br /> 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 environment,
<br /> and perform well in the landscape.
<br /> Our 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 present a low risk of damage or injury if they fail.
<br /> However, we must be concerned about safety in use areas. Therefore, where development
<br /> encroaches into existing plantings, we must consider their structural stability as well as their
<br /> potential to grow and thrive in a new environment. Where development will not occur, the normal
<br /> life cycles of decline, structural failure, and death should be allowed to 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, demolition of
<br /> existing structures, changes in soil grade and moisture, and soil compaction than are non-
<br /> vigorous trees. For example, young valley oak#66 would be more tolerant of impacts
<br /> than evergreen ash #52, which had a large trunk wound with decay present, and sparse
<br /> foliage.
<br /> • Structural integrity
<br /> Trees with significant amounts of wood decay and other structural defects that cannot be
<br /> corrected are likely to fail. Such trees should not be preserved in areas where damage to
<br /> people or property is likely. For example, blackwood acacia#51 was leaning north and
<br /> had multiple branch attachments arising at 7 feet; these structural defects are difficult if not
<br /> impossible to correct in mature trees.
<br /> HcrtScience I Bartlett Consulting,Divisions of The F.A. Bartlett Tree Expert Company
<br /> and structural condition of the tree, and its
<br /> potential to remain an asset to the site for years to come.
<br /> High: Trees with good health and structural stability that have the potential
<br /> for longevity at the site.
<br /> Moderate: Trees with somewhat declining health and/or structural defects that
<br /> can be abated with treatment. The tree will require more intense
<br /> HortScience I Bartlett Consulting • Divisions of The F.A. Bartlett Tree Expert Company
<br /> 325 Ray St.Pleasanton, CA 925.484.0211 • www.hortscience.com
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