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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 activities such 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 feet orange polyethylene laminar safety fencing is <br /> acceptable. Figure 4 <br /> 3. Passive forms of tree protections may be utilized to <br /> r1 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 />