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56 provided. The three-zone approach shall include an EZ, Contamination Reduction Zone (CRZ), and a Support Zone (SZ). The three-zone approach is not required for construction work outside contaminated areas where control of site contamination is not a concern. Specific work control zones shall be established as necessary during task planning. Site work zones should be modified in the field as required based on factors such as equipment used, air monitoring results, environmental conditions, or alteration of work plans. The following guidelines shall be used to establish and revise these preliminary zone designations. 9.2.1 SUPPORT ZONE The SZ is an uncontaminated area (trailers, offices, field vehicles, etc.) that will serve as the field support area for most operations. It provides field team communications and staging for emergency response. This zone will have appropriate sanitary facilities, safety, and emergency response equipment. Potentially contaminated personnel and materials are not allowed in this zone. The only exceptions are appropriately packaged and decontaminated materials or personnel with medical emergencies that cannot be decontaminated. 9.2.2 CONTAMINATION REDUCTION ZONE Where possible, the CRZ is established between the EZ and the SZ, upwind of the contaminated area. It provides an area for decontaminating personnel, portable handheld equipment and tools, and heavy equipment. In addition, the CRZ provides access to heavy equipment and emergency support services. 9.2.3 EXCLUSION ZONE The EZ is where activities may involve exposure to site contaminants and/or hazardous materials or conditions. This zone shall be demarcated to prevent unauthorized entry. More than one EZ may be established if there are different levels of protection to be employed or other hazards in the same work area. The EZ should be large enough to allow adequate space for the activity to be completed, including field personnel, equipment, and necessary emergency equipment. The EZ shall be demarcated with some form of physical barrier signage , as indicated in 9.1. The physical barrier or signage shall be placed so that it is visible to personnel approaching or working in the area. Barriers and boundary markers shall be removed when no longer needed.