2_Exhibits A-E - Laserfiche WebLink

Arborist Report. May 8, 2021. HortScience, Inc. 535 Sycamore Road. Davasam and Chekka. Page 5  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 and Baileys acacia are sensitive to construction impacts; while coast live oak and coast redwood are 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. The California Invasive Plant Inventory Database (www.cal-ipc.org) lists species identified as having being invasive. Pleasanton is part of the Central West Floristic Province. Baileys acacia and Mexican fan palm are considered invasive. 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, following page, provides a summary of suitability ratings. Suitability ratings for individual trees are provided in the Tree Assessment Form (see attachments). We consider trees with high suitability for preservation to be the best candidates for preservation. We do not recommend retention of trees with low suitability for preservation in areas where people or property will be present. Retention of trees with moderate suitability for preservation depends on the intensity of proposed site changes. Table 2. Tree suitability for preservation. 535 Sycamore Road. Pleasanton CA. High Trees with good health and structural stability that have the potential for longevity at the site. Fourteen (14) trees were rated as having high suitability for preservation: coast redwood #55, 56, 57, 58, 59, 67, 91, 92, and 93; Mexican fan palm #51, 53, 77; Italian cypress #164, and valley oak #96. Moderate Trees in fair health and/or possessing structural defects that may be abated with treatment. Trees in this category require more intense management and monitoring, and may have shorter life-spans than those in the “high” category. Thirty-four (34) trees were rated as having high suitability for preservation including 25 coast redwoods; valley oaks #61, 64, 66, 76, 94, and 99; Calif. black walnut #152, English walnut #50, and pecan #69.