A. Security fencing can vary in design, height and type depending on local security needs. Generally, however, the following standards are acceptable: (1) (2) (3) (4) (5) (6) (7) Par 7 Fencing of number 10-gauge, galvanized steel, chain link fabric, which is installed to a height of no less than eight-feet and which is topped with a three stand (12 gauge) barbed wire overhand with a minimum of six-inch separation between strands. The overhang installed at a forty-five-degree angle from the horizontal and extending outward. Installation of a double apron barbed wire overhang, and fencing more than eight feet, is considered highly desirable when an area to be protected is in a high-risk area. B. Fence posts installed at ten-foot intervals on-center. C. The top and bottom selvages of the fence having a twisted and barbed finish. The bottom of the fence installed to within two inches of hard surfacing or stabilized soil; however, in areas where unstable soil conditions are prevalent, the fabric installed to extend at least two inches below the surface or imbedded in concrete curbing. D. All fencing grounded. Care should be taken that metallic fencing is not installed when it interferes with the operation of navigation aids. E. Where traverse culverts, troughs, or other openings larger than ninety-six square inches in the perimeter are unavoidable, the openings protected by fencing, iron grills, or other suitable barriers to preclude unauthorized access into the area. These barriers should be of materials at least equal in strength and durability to the fence and should be installed in a manner so as to deter unauthorized removal and not deter drainage.
