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B. Protective Barriers. <br /> 1. Active protective tree fencing shall be installed along the outer edge of <br /> and completely surrounding the critical root zones of all significant trees <br /> or stands of trees, or otherwise designated tree protective zones, prior to <br /> any building construction. <br /> 2. These fences will be a minimum four feet (4') high. Four feet (4') orange <br /> polyethylene laminar safety or snow fencing is acceptable. Additional <br /> specifications include: <br /> a. The stakes used to hold up fencing shall be a minimum of four and <br /> one-half feet (4 �/2') tall. <br /> b. They shall be kept no farther than ten feet (10') a part from one <br /> another. <br /> c. The fence shall be adequately secured to the stakes. <br /> d. Fencing shall be required for trees to be saved that are within fifty feet <br /> (50') of the construction zone, unless exceptions are made by the <br /> NRT or their designee. <br /> 3. Orange silt/tree fence with wood stakes is acceptable for tree <br /> protection under certain conditions (i.e. an entire development). <br /> 2. Passive forms of tree protection may be utilized to delineate tree save <br /> areas, which are beyond fifty feet (50') from the construction zone. These <br /> areas must be completely surrounded with continuous rope or flagging <br /> (heavy mil - minimum four (4') inches wide). All passive tree protection <br /> must be accompanied by "Keep Out" or"Tree Save" signage. <br /> 3. All tree protection zones should be designated as such with "Tree Save <br /> Area" signs posted visibly on all sides of the fenced area. These signs <br /> are intended to inform subcontractors of the tree protection process. <br /> Signs requesting subcontractor cooperation and compliance with tree <br /> protection standards are recommended for site entrances. <br /> 4. All tree fencing barriers must be installed prior to and maintained <br /> throughout building construction and should not be removed until <br /> completion of construction and until landscaping is installed. <br /> C. Encroachment. Most trees can tolerate only a small percentage of critical root <br /> zone loss. If encroachment is anticipated within the critical root zones of <br /> specimen trees, stands of trees, or otherwise designated tree protection zones, <br /> the following preventive measures shall be employed: <br /> 1. Clearing Activities: Roots, often fuse and tangle amongst trees. The <br /> removal of trees adjacent to tree save areas can cause inadvertent <br /> damage to the protected trees. Wherever possible, it is advisable to cut <br /> minimum two (2')foot trenches (e.g., with a "ditch-witch") along the limits <br /> of land disturbances, so as to cut, rather than tear, roots. Directionally <br /> felling trees outward into disturbance areas and grinding stumps is also <br /> acceptable. <br /> 8 <br />