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<br />Subsequently, the boundary may be readjusted based on additional observation and/or measurements. The area <br />should be physically secured by barrier tape into well-defined boundaries. <br /> <br />In the event that the public or any emergency responder has been exposed prior to recognition of a hazardous <br />substance, those persons exposed should be isolated to avoid spreading any contamination and so that proper <br />medical treatment and monitoring can be arranged. <br /> <br />Those not exposed must be kept out of the contaminated area. Unless otherwise demonstrated, everything leaving <br />the Exclusion Zone should be considered contaminated and appropriate methods established for decontamination <br />should be implemented. <br /> <br />Warm Zone: Between the Exclusion Zone and the Support Zone is the Contamination Reduction Zone. The <br />purpose of this zone is to provide an area to prevent or reduce the transfer of contaminants that may have been <br />picked up by personnel or equipment returning from the Exclusion Zone. All decontamination activities occur in <br />this area. <br /> <br />The boundary between the Support Zone and the Contamination Reduction Zone is the "Contamination Control <br />Line." This boundary separates the possibly contaminated area from the clean zone. Entry into the Contamination <br />Reduction Zone will be through an access control point. Personnel entering at this location will be wearing the <br />prescribed level of protection for working in the Contamination Reduction Zone. Exiting the known contaminated <br />protective clothing and/or equipment and the appropriate decontamination procedures be followed. <br /> <br />At the boundary between the Contamination Reduction Zone and the Exclusion Zone is the "Hot Line" and access <br />control station. Entrance into the Exclusion Zone requires the wearing of the prescribed chemical protective <br />clothing that may be different than the equipment requirements for working in the Contamination Reduction Zone. <br /> <br />At a point close to the "Hot Line," a personnel and/or equipment decontamination station is established for those <br />exiting the Exclusion Zone. Unless otherwise demonstrated, everything leaving the Exclusion Zone should be <br />considered contaminated and appropriate methods established for decontamination should be implemented. <br /> <br />Cold Zone: The Support Zone is the outermost area of the site and is considered a non-contaminated or "clean <br />area." It is designated as a controlled area for authorized support personnel and the location for support equipment <br />(Command Post, Equipment, etc.) Since normal clothing is appropriate within this zone, potentially contaminated <br />personnel clothing, equipment, etc. are not permitted. <br /> <br />Area Dimensions: Considerable judgment is needed to assure safe working distances for each area balanced <br />against practical work considerations. During long-term operations zones may be adjusted. <br /> <br />The following criteria are to be considered in determining the area dimensions: <br /> <br />a) Physical and topographical barriers; <br />b) Weather conditions; <br />c) Monitoring measurements; <br />d) Explosion/exposure potential; <br />e) Physical, chemical, toxicological, etc., characteristics of the contaminant(s); and <br />f) Cleanup activities. <br /> <br />Other Considerations: The use of a three-zone system of area designation, access control points and <br />decontamination procedures provides a reasonable assurance against the translocation of contamination substance. <br />This control system is based on a "worst case" situation. Less stringent site control and decontamination procedures <br />than described may be utilized based upon more accurate information on the types of contaminants involved and the <br />contaminating hazards they present. This information can be obtained through air monitoring, instrument survey, <br />etc., and technical data concerning the characteristics and behavior of material present. Site control requirements <br />can be modified within the limits of safety for specific situations once more reliable data has been analyzed. <br /> <br />53 <br />