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Arborist Report—Gudaitis Residence, Pleasanton Page 6
<br /> January 19, 2021
<br /> • Species response
<br /> There is a wide variation in the response of individual species to construction impacts and
<br /> changes in the environment. Coast redwoods, for example, are relatively tolerant to
<br /> construction impacts,while California black walnuts have a very poor tolerance to
<br /> 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 able to
<br /> generate new tissue and respond to change.
<br /> • Species 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 displaced.
<br /> The California Invasive Plant Inventory Database http://www.cal-ipc.orq/plants/inventory/
<br /> lists species identified as being invasive. Pleasanton is part of the Central West Floristic
<br /> Province. Only one of the tree species assessed, blackwood acacia, was listed as being
<br /> of limited invasiveness.
<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(see Tree Assessment in Exhibits,
<br /> and Table 2). We consider trees with high suitability for preservation to be the best candidates for
<br /> preservation. We do not recommend retention of trees with low suitability for preservation in areas
<br /> where people or property will be present. Retention of trees with moderate suitability for
<br /> preservation depends upon the intensity of proposed site changes.
<br /> Table 2. Tree suitability for preservation
<br /> Gudaitis Residence, Pleasanton, CA
<br /> High These are trees with good health and structural stability that have the potential
<br /> for longevity at the site. Fourteen (14)trees had high suitability for
<br /> preservation.
<br /> Moderate Trees in this category have fair health and/or structural defects that may be
<br /> abated with treatment. These trees require more intense management and
<br /> monitoring, and may have shorter life-spans than those in the "high"category.
<br /> Ten (10)trees had moderate suitability for preservation.
<br /> Low Trees in this category are in poor health or have significant defects in structure
<br /> that cannot be abated with treatment. These trees can be expected to decline
<br /> regardless of management. The species or individual tree may possess either
<br /> characteristics that are undesirable in landscape settings or be unsuited for use
<br /> areas. Sixteen (16)trees had low suitability for preservation.
<br /> Note: Table does not include California black walnut#1320. This tree was dead.
<br /> HortScience I Bartlett Consulting; Divisions of The F.A Bartlett Tree Expert Company
<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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