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Tree Report, Vineyard Pass Subdivision Pleasanton, CA April 5. 2006 HortScience, Inc. Page 8 The following recommendations will help reduce impacts to trees from development and maintain and improve their health and vitality through the clearing and construction phases. Design recommendations 1. Any changes to the plans affecting the trees should be reviewed by the consulting arborist with regard to tree impacts. These include, but are not limited to, site plans, improvement plans, utility and drainage plans, grading plans, landscape and irrigation plans, and demolition. Trunk locations, trunk elevations and driplines should be included on all plans. 2. A True PROTecTioN ZONE shall be established around each tree. No grading, scarification, compaction, excavation, construction or storage of materials shall occur within that zone. No underground services including utilities, sub-drains, water or sewer shat{ be placed in the TRee PROTecTioN ZoNe. Spoil from trench, footing, utility or other excavation shall not be placed within the TRee PRO7ecTioN ZoNe, either temporarily nor permanently. For design purposes, the TRee PROrecT~oN ZONE should be either the dripline, edge of proposed hardscape or edge of decking based on the proposed plans. The limits of the Tree Protection Zone will be adjusted following design changes. 3. Incorporate trees #78, 79 and 80 into the design of the deck. Design the deck so the location of the piers and permanent structural supports are at least 3' from the trunks. Deck boards can be within a few inches of the trunk, but should be installed to allow for trimming of deck boards to accommodate future tree growth. Use precast concrete piers on existing grade to reduce impacts to roots. If piers must be installed below grade hand dig piers located within the dripline. Do not use a power auger. If roots 2" and larger in diameter are encountered leave the root in place and move the pier. 4. Tree Preservation Guidelines, prepared by the Consulting Arborist, should be included on all plans impacting trees (eg. demolition, grading, utilities and landscaping). 5. Any herbicides placed under paving materials must be safe for use around trees and labeled for that use. Pre-construction treatments and recommendations 1. The construction superintendent should meet with the Consulting Arborist before beginning work to discuss work procedures and tree protection. 2. Fence all trees to be retained to completely enclose the TRee PROTECrioN ZoNe prior to demolition, grubbing or grading. Fences shall be 4 ft. orange construction fence or equivalent as approved by the City. Fences are to remain until all grading, construction and landscaping is completed. 3. Some trees may require pruning to provide clearance for demolition and construction. All pruning shall be done by a State of California Licensed Tree Contractor (C61/D49). All pruning shall be done by Certified Arborist or Certified Tree Worker in accordance with the Best Management Practices for Pruning (International Society of Arboriculture, 2002) and adhere to the most recent editions of the American National Standard for Tree Care Operations (2133.1) and Pruning (A300).