and out of the contaminated area and to verify that site control procedures are followed. Separate
entrances and exits should be established to separate personnel and equipment movement into
and out of the Exclusion Zone.
All persons who enter the Exclusion Zone should wear the appropriate level of Personal
Protective Equipment (PPE) for the degree and types of hazards present (see Chapter 5). If the
Exclusion Zone is subdivided, different levels of PPE may be appropriate. Each subdivision of
the Exclusion Zone should be clearly marked to identify the hazards and the required level of
9.3.2. The Contamination Reduction Zone
The Contamination Reduction Zone is the area in which decontamination procedures take place.
It is the transition area between the Exclusion Zone and the Support Zone. The purpose of the
Contamination Reduction Zone is to reduce the possibility that the Support Zone will become
contaminated or affected by the site hazards.
The Contamination Control Line marks the boundary between the Contamination Reduction
Zone and the Support Zone and separates the clean areas of the site from those areas used to
decontaminate workers and equipment. Access Control Points between the Contamination
Reduction Zone and the Support Zone should be established to ensure workers entering the
Contamination Reduction Zone are wearing the proper PPE and that workers exiting the
Contamination Reduction Zone to the Support Zone remove or decontaminate all potentially
9.3.3. The Support Zone
The Support Zone is the uncontaminated area where workers are unlikely to be exposed to
hazardous substances or dangerous conditions. Because the Support Zone is free from
contamination, personnel working within it may wear normal work clothes. Any potentially
contaminated clothing, equipment, and samples (outer containers) should remain inside the
Contamination Reduction Zone or the Exclusion Zone.
Designation of the Support Zone should be based on all available site characterization data and
should be located upwind from the Exclusion Zone. The Support Zone should be in an area that
is known to be free of elevated (i.e., higher than background) concentrations of hazardous
9.4. USING THE BUDDY SYSTEM
When carrying out activities in the Exclusion Zone, workers should use the "buddy system" to
ensure that rapid assistance can be provided in the event of an emergency. The "buddy system"
is an approach used to organize workgroups so that each worker is designated to be observed by