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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 />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 />