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Tree Report, Vineyard Gardens, LLC, Pleasanton, CA HortScience, Inc. December 10, 2007 Page 4 ^ Species response There is a wide variation in the response of individual species to construction impacts and changes in the environment. English walnut have a poor tolerance to construction impacts. In contrast, coast redwood is quite 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. ^ Species invasiveness Species which spread across a site and displace desired vegetation are not always appropriate for retention. This is particularly true when indigenous species are displaced. In this case none of the species surveyed are considered invasive species, and they rarely reproduce in a landscape setting. Each tree was rated for suitability for preservation based upon its age, health, structural condition and ability to safely coexist within a development environment (Table 2). We consider trees with good suitability for preservation to be the best candidates for preservation. We do not recommend retention of trees with poor suitability for preservation in areas where people or property will be present. Retention of trees with moderate suitability for preservation depends upon the intensity of proposed site changes. Table 2: Tree Suitability for Preservation Good These are trees with good health and structural stability that have the potential for longevity at the site. Four (4) trees were rated as having good suitability for preservation, including 1 Heritage tree. Tree No. Species Diameter Heritage (in.) Tree? - 272 Chinese hackberry 15 No 273 Almond 8,7,6 No 275 Chinese hackberry 16 No 284 Coast redwood 31 Yes