Quantcast Maintaining Clear Zones for Guard and/or CCTV Observation

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Maximize Exterior Site Forced-Entry Threat Ingress/Egress
Distances.  In all cases, it is best to locate the facility as far away from
installation perimeters as possible.  This is the case whether threat
detection occurs at the site perimeter or not.  Therefore, locating the
facility has a deterrent effect making the intruder's job more difficult and
enhancing the possibility of being observed.  To allow one to account for the
exterior-site-related threat ingress/egress in the timeline analysis requires
locating guards in towers or deploying sensors along extended site perimeter
fence lines.  As discussed in par. 3.2.6, this option typically involves high
operating costs or (in the case of sensors) high initial purchase, as well as
installation and maintenance costs.  The cost effectiveness of this must be
weighed against the added cost and the intruder ingress/egress time gained
relative to the alternative of hardening the building more and installing IDS
in a smaller area at or within the building.  Paragraph 4.3.2.(2)(b) shows
the time to penetrate or climb over a fence is only a few seconds and Figure
8 shows ingress/egress times of less than a minute for site distances up to
400 feet.  Installing exterior fence IDS over extended perimeters is not cost
effective if only a small amount of additional delay time is gained. It is
recommended only if required by DoD regulation. Exterior perimeter IDS
options are discussed in par. 4.5.
Maintaining Clear Zones for Guard and/or CCTV Observation.  In
restricted areas the facility should be sited to assure that extended,
well-lighted clear zones are maintained surrounding restricted area fences
and building exteriors where threat detection and assessment by guards or IDS
and CCTV are required.  This includes the elimination of all plantings,
trees, and shrubs likely to grow over 8 feet (2.4 m) in height as well as any
other manmade obscuring features on the site.  Minimum clear zone
requirements prescribed by military regulation follow.
1)  DoD 5210.41-M - Nuclear Weapons Security Manual (Paragraph
3-300).  Requires clear zones that extend 30 feet (9.1 m) on the outside and
the inside of the perimeter fence when a single fence is used; and 30 feet
(9.1 m) on the outside of the outer fence, the entire area between the two
fences and 30 feet (9.1 m) inside the inner fence.
2)  DoD 5100.76-M - Physical Security of Sensitive Conventional
Arms, Ammunition, and Explosives (Paragraph 501i).  Requires clear zones 20
feet (6.1 m) on the outside and 30 feet (9.1 m) on the inside of the
perimeter fence.
Exterior Site Perimeter Barriers
Introduction.  Exterior site fences and vehicle barriers are those
located on the perimeter of the site.  The following addresses each.


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