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Tree Preservation Report, 4171 &4189 Stanley Blvd. Ed Brennan, Consulting Arborist January 9, 2009 Page 3 Table 2: Heritage Trees Tree No. Species Trunk diameter 61 Deodar cedar 33 62 Deodar cedar 41 64 Deodar cedar 37 65 Douglas fir 23 68 Canary Isl. date palm 28 71 Calif. black walnut 14,12,10,8,7,6 72 Almond 14,10,8 73 Almond 16,16,15,12,8 74 English walnut 21 76 Calif. black walnut 29,23 78 English walnut 16,12 79 Glossy privet 12,11,9 Suitability for Preservation Before evaluating the irr pacts that will occur during development, it is important to consider the quality of the tree resource itself, and the potential for individual trees to function well over an extended length of time. Trees that are preserved on development sites must be carefully selected to make sure that they may survive development impacts, adapt to a new environment and perform well in the landscape. My goal is to identify trees that have the potential for long-term health, structural stability and longevity. For trees growing in open fields, away from areas where people and property are present, structural defects and/or poor health presents a low risk of damage or injury if they fail. However, we must be concerned about safety in use areas. Therefore, where development encroaches into existing plantings, we must consider their structural stability as well as their potential to grow and thrive in a new environment. Where development will not occur, the normal life cycles of decline, structural failure and death should be allowed to continue. Evaluation of suitability for preservation considers several factors: • Tree health Healthy, vigorous trees are better able to tolerate impacts such as root injury, demolition of existing structures, changes in soil grade and moisture, and soil compaction than are non-vigorous trees. • Structural integrity Trees with significant amounts of wood decay and other structural defects that • cannot be corre ted are likely to fail. Such trees should not be preserved in areas where damage•o people or property is likely. • Species response There is a wide variation in the response of individual species to construction impacts and changes in the environment. In our experience, for example, Calif. black walnut is sensitive to construction impacts, while coast is tolerant of site disturbance. • Tree age and longevity Old trees, while having significant emotional and aesthetic appeal, have limited physiological capacity to adjust to an altered environment. Young trees are better able to generate new tissue and respond to change. The potential longevity of the Monterey pines is low because of the mature age and infection with pitch canker.