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DRAFT Arborist Report—Chashmawala Residence HortScience I Bartlett Consulting
<br /> 4108 Foothill Road, Pleasanton Page 3
<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 provide greater assurance they survive development impacts, adapt to a new
<br /> environment, 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. 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
<br /> of existing structures, changes in soil grade and moisture, and soil compaction than are
<br /> non-vigorous trees.
<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.
<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 general, blue oak is moderately tolerant of
<br /> construction impacts and site changes.
<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 able to
<br /> generate new tissue and respond to change.
<br /> • Invasiveness
<br /> Species that spread across a site and displace desired vegetation are not always
<br /> appropriate for retention. This is particularly true when indigenous species are
<br /> displaced. The California Invasive Plant Inventory Database(http://www.cal-ipc.orq/paf/)
<br /> lists species identified as being invasive. Pleasanton is part of the Central West Floristic
<br /> Province. None of the trees evaluated at the site are listed as invasive.
<br /> Each tree was rated for suitability for preservation based upon its age, health, structural condition
<br /> and ability to safely coexist within a development environment. Table 2 (following page) provides
<br /> a summary of suitability ratings. Suitability ratings for individual trees are provided in the Tree
<br /> Assessment Forms(see attachments).
<br /> We consider trees with good suitability for preservation to be the best candidates for preservation.
<br /> We do not recommend retention of trees with low suitability for preservation in areas where
<br /> people or property will be present. Retention of trees with moderate suitability for preservation
<br /> depends upon the intensity of proposed site changes.
<br /> be abated with treatment. The tree will require more intense
<br /> management and monitoring, and may have shorter life span than
<br /> those in 'high' category.
<br /> Low: Trees in poor health or with significant structural defects that cannot
<br /> be mitigated. Tree is expected to continue to decline, regardless of
<br /> treatment. The species or individual tree may have characteristics
<br /> that are undesirable for landscapes, and generally are unsuited for
<br /> use areas.
<br />sion
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<br /> Planning Commission
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<br />neer;
<br /> b. Show construction vehicles and equipment parking area, materials storage, temporary
<br /> fencing, construction trailer location, and construction contractors/workers parking
<br /> area.
<br /> P19-0059 Planning Commission
<br /> Page 5of12
<br />-0059 Planning Commission
<br /> Page 4 of 12
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