17 ATTACHMENT 03 - Laserfiche WebLink

Tree Report, Vineyard Gardens, LLC, Pleasanton, CA HortScience, Inc. December 10, 2007 Page 9 Tree Preservation Guidelines The goal of tree preservation is not merely tree survival during development but maintenance of tree health and beauty for many years. Trees retained on sites that are either subject to extensive injury during construction or are inadequately maintained become a liability rather than an asset. The response of individual trees depends on the amount of excavation and grading, care with which demolition is undertaken, and construction methods. Coordinating any construction activity inside the TREE PROTECrioN ZONE can minimize these impacts. 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. Tree Preservation Guidelines, prepared by the Consulting Arborist, should be included on all plans impacting trees (eg. demolition, grading, utilities and landscaping). 2. 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. A TREe 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 shall be placed in the TRee PROTecTioN ZoNe. Spoil from trench, footing, utility or other excavation shall not be placed within the TRee PROrecrioN ZoNe, either temporarily nor permanently. For design purposes, the TRee PROrecTioN ZoNe is defined as the existing fence on the west side of the project site. The limits of the Tree Protection Zone will be adjusted following design changes. 4. Use a pier and caisson design for the retaining wall within the dripline of the four off-site trees. Located piers at least 4'on either side of the trunks. Piers within the dripline will be dug by hand or water excavation. The bottom of the wall can rest on the existing grade, but not extend below existing grade. Use the smallest drill rig, crane and other equipment as possible to construct the wall under the canopy of the trees without damaging tree branches. If roots 2" in diameter or less are encountered they _ may be pruned clean and square at sound tissue. If roots greater then 2" in diameter are encountered move pier location to avoid the root. If the root cannot be avoided contact the Consulting Arborist for direction. Do not cut roots larger the 2" in diameter unless directed by the Consulting Arborist. 5. Do no apply line to the soil for compaction purposes within 30' of the dripline of all trees. Lime is toxic to plant roots. 6. 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.