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III. LANDSCAPE/SITE TREATMENT <br />Protection of Existing Trees <br />Fig. 34: Tree wells can help save hillside trees <br />only to a depth of 4 feet. <br />Fig. 35: Trees protected with a chain link fence <br />at the drip line during construction. <br />17. Significant existing trees should be protected as <br />discussed under Site Planning. <br />18. The survival and general health of a tree depends as <br />much on the condition of its root system as it does on <br />the factors influencing the above -ground portion. This <br />vital root system extends out to, and sometimes beyond <br />the tree's drip line (the outermost reach of branches). <br />Any significant disturbance to the root area, such as <br />high surface compaction, root severing, over -watering <br />and/or removal of organic material in which the tree has <br />composted over several years, will almost certainly kill <br />the tree. Tree removal and replacement would be <br />required after a few seasons of progressive <br />deterioration. <br />Based upon identification and examination, an <br />evaluation can be made to determine which trees will <br />prove valuable to the site design. This evaluation is an <br />important factor in the placement and design of <br />buildings, circulation patterns and other site elements. <br />19. Significant trees should be protected during <br />construction with a chain-link fence or plastic vinyl <br />construction fence at the drip line. The protection fence <br />should be installed prior to issuance of grading permit. <br />Removal or destruction of fencing should be cause for a <br />Stop Work Order until reviewed by City staff. <br />24 <br />