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John Miller Architects, Saint Elizabeth Seton Church Tree Report, June 2006 HortScience, Inc. Page 6 Appraisal of Value The City of Pleasanton requires that the value of all trees to be preserved during development be established, as well as the value of all "Heritage" trees to be removed. To accomplish this, I used the standard methods found in Guide for Plant Appraisal, 9th edition (published in 2000 by the Intemational Society of Arboriculture, Champaign IL). In addition, I referred to Species Classification and Group Assignment (2004), a publication of the Western Chapter of the International Society of Arboriculture. These two documents outline the methods employed in tree appraisal. The value of landscape trees is based upon four factors: size, species, condition and location. Size is measured as trunk diameter, normally 54" above grade. The species factor considers the adaptability and appropriateness of the plant in the East Bay area. The Species Classification and Group Assignment lists recommended species ratings and evaluations. Condition reflects the health and structural integrity of the individual, as noted in the Tree Survey Form. Location considers the site, placement and contribution of the tree in its surrounding landscape. The appraised value of tree #181, the only "Heritage" tree recommended for removal, is $3,600 (Table 4). The appraised value of tree #182, the only tree recommended for preservation is $8,300 (Table 4). Table 4: Appraised value of Individual trees Tree No. Species Trunk diameter Heritage? (in.) Appraised value ($) 181 182 English walnut 27 Yes Calif. black walnut 26,22,14 Yes 3,600 8,300 Tree Preservation Guidelines The following recommendations will help reduce impacts to trees from development and maintain and improve their health and vitality through the clearing, grading and construction phases. Design recommendations 1. A TREE PROTECTION ZONE shall be established around each tree to be preserved. No grading, excavation, construction or storage of materials shall occur within that zone. The TPZ shall be established at the dripline of tree #182 to the east and west, at the back of curb to the north and at the property line to the south. 2. No underground services including utilities, sub-drains, water or sewer shall be placed in the TREE PROTECTION ZONE. 3. Irrigation systems must be designed so that no trenching will occur within the TREE PROTECTION ZONE.