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diameter must be secured to prevent unauthorized opening.  Unavoidable
drainage ditches, culverts, vents, ducts, and other openings that have a
cross-sectional area greater than 96 square inches (619 square centimeters)
and with any cross-sectional dimension greater than 10 inches (250 mm) will
be protected by securely fastened welded bar grills.  As an alternative,
drainage structures may be constructed of multiple pipes, each pipe having a
diameter less than 10 inches (250 mm).  Multiple pipes of this diameter may
also be placed and secured in the inflow end of a drainage culvert to prevent
access to the restricted area via the culvert.
40.1.4  Other positive barriers.  Building walls and roofs, when serving as
perimeter barriers, must be constructed and arranged to provide uniform
protection equivalent to that provided by chain link fencing.  If a building
has less than two stories, a top guard must be used along the outside coping
to deny access to the roof.  Windows, inactive doors, and other openings must
be protected by securely fastened bars, grills, or chain link screens.
70.1.5  Facility entrances.  The number of active entrances to the facility
and perimeter entrances should be limited to the minimum number required for
safe and efficient operation of the facility.  Active perimeter entrances
should be designed so security forces can maintain full control without
impeding vehicular or personnel movement.  This involves having sufficient
entrances to accommodate the peak flow of pedestrian and vehicular traffic,
and adequate lighting for efficient inspection of access credentials.  When
exterior entrances are not manned during nonduty hours, a sturdy locking
mechanism should be installed.  These entrances should be illuminated during
periods of darkness and should be monitored by closed-circuit TV cameras or
be randomly inspected by roving patrols.  This procedure also applies to
doors and windows that form a part of the protective perimeter.
70.2  Perimeter roads and clear zones.  When a facility's positive perimeter
barrier encloses a large area, an interior, all-weather, perimeter road
should be provided for security patrol vehicles if these areas are not to be
monitored by closed-circuit TV cameras.  Clear zones should be maintained on
both sides of the perimeter barrier to provide an unobstructed view of the
barrier and the ground adjacent to it.  Roads should be within the clear zone
and as close to the perimeter barrier as practical without causing soil
erosion, and should allow passage of a patrol vehicle.
70.2.1  Clear zones.  A clear zone of 20 feet (6 m) or more should exist
between the perimeter barrier and exterior structures, parking areas, and
natural or man-made features.  When possible, a clear zone of 50 feet (15 m)
or more should exist between the perimeter barrier and the structures within
the restricted area, unless greater distances are dictated by the presence of
compromising emanations.  These clear zone distances are obviated when a
building wall constitutes the perimeter barrier.  When it is impossible to
have adequate clear zones because of property lines, natural or man-made
features, it may be necessary to increase the height of the perimeter barrier
(except for building walls), Increase security patrol coverage, provide more
protective lighting, or install an intrusion detection system (IDS) along
that portion of the perimeter barrier.
80.  Protective lighting.  Protective (or security) lighting provides a means
of continuing, during periods of reduced visibility, a degree of protection
close to that maintained during daylight hours.  Protective lighting has
considerable value as a deterrent to would-be thieves and vandals and makes
the actions of a potential saboteur more difficult.


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