2_Exhibits A, C & D - Laserfiche WebLink

Updated Arborist Report HortScience, Inc. 4112 Foothill Rd., October 29, 2018 Page 5 Low 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. Three trees were of low suitability for preservation. Tag# Species Diameter 1 Valley oak 44 2 Valley oak 49 5 Valley oak 42 Evaluation of Impacts and Recommendations Appropriate tree retention develops a practical match between the location and intensity of construction activities and the quality and health of trees. The Tree Assessment Form was the reference point for tree health and condition. I referred to the Overall Site Plan (Sheet Al U/G Utilities) provided by Diamond Design Studio (dated 10-19-2018), Grading Plan provided by Alexander&Associates Inc. (dated 8-22-18) and Planting Plan provided by Thomas Baak& Associated, LLP (dated 3-22-18)to estimate the impacts to trees from the proposed changes. The plan proposes to construct a new house. The perimeter of the property is steeply sloped and the house is to be built at the highest, most level portion of the property. The pad will be graded to an elevation of 527'. Surveyed tree locations were shown on plans around the perimeter of the proposed building pad. No utilities or landscape information was provided. The proposed project would construct a 4-5'-tall retaining wall on the north side of tree#2 and a 1'wall to the west side of tree#4. Installation of the retaining wall and conforming the finish grade will involve soil trenching and installation of footings and potentially slope keyways (no details for slope construction were provided). In the case of tree#2, these activities take place within a small portion of tree dripline, and may cause both root and canopy impacts. • Pruning both canopy and roots may be required at tree#2 due to the grading and construction of a retaining wall 30'from the tree. The dripline slightly extends north over the wall. • A 1' retaining wall will be installed 20'west of tree#4. Based on my review of the current plans all five(5)trees can be preserved. Additional information such as utility and drainage may impact the trees and change recommendations for preservation. Recommendations for preservation are predicated on the implementation of specific recommendations in the Tree Preservation Guidelines. Establishing a Tree Protection Zone(TPZ)around these trees prior to the demolition, grading and construction process will be critical to protecting roots and successfully preserving trees. Trees must be protected during demolition of existing landscape features and must be maintained for the duration of construction. Excavation within Tree Protection Zones shall begin by carefully hand-digging at the edge of excavation to locate and limit damage to tree roots. Work within the TPZ should be performed under the guidance of a Consulting Arborist. Appraisal of Value The City of Pleasanton requires the value be established of all trees to be removed. To accomplish this we used the standard methods found in Guide for Plant Appraisal, 9th edition (published in 2000 by the International Society of Arboriculture, Champaign IL). In addition, we 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. A multi-branched tree, which has