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no less than the total area beneath the tree(s) canopy as <br />defined by the farthest canopy dripline of the tree(s). In <br />some instances, the City Forester may require a protective <br />zone in excess of the area defined by the tree's dripline. <br />3. Layout of the project site utility and grading plans <br />should accommodate the required tree protective zones. <br />Utilities must be placed along corridors between tree <br />protective zones. <br />4. Construction site activitiessuch as parking, <br />material storage, concrete washout, hole placement, etc., <br />shall be arranged so as to prevent disturbances within tree <br />protective zones. <br />5. No disturbance shall occur within the protective <br />zone of specimen trees or stands of trees without prior <br />approval by the City Forester. <br />B. Protective Barriers <br />1. Active protective tree fencing shall be installed <br />along the outer edge of and completely surrounding the <br />critical root zones of all specimen trees or stands of trees, <br />or otherwise designated tree protective zones, prior to any <br />land disturbance. <br />2. These fences will be a minimum four (4) feet high. <br />Four foot orange polyethylene laminar safety fencing is <br />acceptable. Figure 4 <br />3. Passive forms of tree protectionsi may be utilized to <br />delineate tree save areas which are remote from areas of land <br />disturbance. These areas must be completely surrounded with <br />continuous rope or flagging (heavy mill. minimum 4" wide). <br />All passive tree protection must be accompanied by "Keep Out" <br />or "Tree Save" signage. Figure 5 <br />4. all tree protection zones should be designated as <br />such with "tree save area" signs posted visibly on all sides <br />of the fenced in area. These signs are intended to inform <br />subcontractors of the tree protection process. Signs <br />requesting subcontractor cooperation and compliance with tree <br />protection standards are recommended for site entrances. <br />5. All tree fencing barriers must be installed prior to <br />and maintained throughout land disturbance process and <br />building construction, and should not be removed until <br />landscaping is installed. <br />C. Encroachment. Most trees can tolerate only a small <br />percentage of critical root zone loss. If encroachment is <br />anticipated within the critical root zones of specimen trees, <br />stands of trees, or otherwise designated tree protective <br />zones, the following preventive measures shall be employed: <br />1. Clearing activities: Roots often fuse and tangle <br />amongst trees. The removal of trees adjacent to tree save <br />areas can cause inadvertent damage to the protected trees. <br />Wherever possible, it is advisable to cut minimum two (2) <br />foot trenches (e.g. with a "ditch -witch") along the limits of <br />land disturbances, so as to cut, rather than tear, roots. <br />Directionally felling trees outward into disturbance areas <br />and grinding stumps is also acceptable. <br />2. It is very strongly suggested that all clearing in <br />• <br />• <br />• <br />