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3.3.1 Correct structural problems, remove deadwood and decayed parts, <br />3.3.2 Enhance the tree's natural beauty and develop its natural shape, <br />3.3.3 Comply with the Eugene Code, 1971, <br />3.3.4 Correct a safety or health problem, <br />3.3.5 Clear the vision of regulatory signs, or <br />3.3.6 Maintain clearance around electrical lines. <br />3.4 All tree work performed near electrical lines shall conform to the National <br />Electrical Safety Code, ANSI Z-133.1, and OAR 437-002-0301 through 0311. <br />3.5 Trees pruned for electrical line clearance shall follow the pruning <br />guidelines contained within the publication of Dr. Shigo entitled "Pruning Trees Near <br />Electrical Lines" and be performed in accordance with the written agreement between the <br />Eugene Water & Electric Board (EWEB) and the City. <br />3.6 Unless otherwise required herein, young trees shall be pruned leaving at <br />' least 2/3 of the height. of the tree in foliage and canopy.. <br />3.7 Mature trees shall be pruned in a manner that retains well-spaced, inner <br />lateral branches so as to allow the trunk taper to be developed as needed for the strength <br />of the branch attachment. <br />3.8 No tree shall have more than 20 percent of its canopy removed in any one <br />pruning or any one year unless approved in writing by the Urban Forester. <br />3.9 Street trees shall be pruned to allow clearance 9 feet above the sidewalk <br />and 15 feet above the street. Limbs maybe pruned back from the sidewalk and street or <br />removed at the trunk to meet these clearances if 2/3 of the height of the tree remains in <br />canopy. <br />3.10 No hooks, spikes, or climbing gear which pierces the trunk of a tree shall <br />be used unless approved in writing by the Urban Forester. <br />4. Tree Removal. No person shall remove a street tree without first obtaining a <br />permit from the City, specifically authorizing removal of the street tree. The Urban Forester <br />shall review the permit application and may condition approval upon replacement of the street <br />tree with another tree pre-approved by the Urban Forester, or a requirement to pay to the City an <br />amount sufficient to fund the planting and establishment by the City of a replacement tree of <br />similar value. The value of the existing street tree to be removed shall be calculated using the <br />methods set forth in the edition then in effect of the Guide for Plant Appraisal published by the <br />Administrative Order - 13 <br />