11 ATTACHMENT 04 - Laserfiche WebLink

Tree Preservation Report, 4171 &4189 Stanley Blvd. Ed Brennan, Consulting Arborist January 9, 2009 Page 4 Each tree was rated for suitability for preservation based upon its age, health, structural condition and ability to safely coexist within a development environment (see Tree Survey for suitability ratings for individual trees). Table 3: Tree Suitability for Preservation Good These are trees with good health and structural stability that have the potential for longevity at the site. Six(6)trees were rated as having good suitability for preservation. These include three (3) Deodar cedars, the Canary Island date palm, a coast live oak, and a Douglas fir. Moderate Trees in this category have fair health and/or 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 "good"category. Thirteen (13) trees were rated as having moderate suitability for preservation. These include four(4) Calif. black walnuts, two (2)each of almond and glossy privet, and one (1)each of coast live oak, English walnut, Italian stone pine, lime, orange, and valley oak. Poor Trees in this category are in poor health or have significant defects in structure that cannot be abated with treatment. These trees can be expected to decline regardless of management. The species or individual tree may possess either characteristics that are undesirable in landscape settings or be unsuited for use areas. Four(4) trees were rated as having poor suitability for preservation. These included two (2) English walnut, one (1) Calif. black walnut, and one(1)fruitless mulberry. Evaluation of Impacts and Recommendations for Preservation Appropriate tree retention develops a practical match between the location and intensity of construction activities and the quality and health of trees. The Tree Survey was the reference point for tree condition and quality. Potential impacts from construction were evaluated using the Site Plan and the Stanley Blvd. Concept exhibit, prepared by Camp & Camp Associates, Walnut Creek. Potential impacts from construction were estimated for each tree. The most significant impacts to the trees would occur as a result of the grading and construction of the new residences, driveways, landscape installations, and trenching for underground utilities. Based on my analysis of the project, I recommend removing the four(4)trees rated as poor in suitability for preservation, and 17 trees whose locations conflict with the site plan (Table 4). The two(2)off-site trees, #69 and 70, could be preserved. Preservation of these trees is predicated on establishing a Tree Protection Zone and other preservation activities described in the Tree Preservation Guidelines that follow.