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10 . 7 Site Control - Work Zones <br /> 10 . 7 . 1 Introduction <br /> The activities required during operations involving hazardous <br /> substances may contribute to the unwanted movement of contaminants <br /> from the site to uncontaminated areas . Site personnel and <br /> equipment may become contaminated and transfer the material into <br /> clean areas . Material may become airborne due to its volatility, <br /> or the disturbance of contaminated soil may cause it to become <br /> windblown. . Contamination control procedures minimize the transfer <br /> of hazardous substances from the site. Two general methods are <br /> used: establishing site work zones and removing contaminants from <br /> people and equipment. <br /> 10 . 7 . 2 Control at the Site <br /> A site must be controlled to reduce the possibility of 1) contact <br /> with any contaminants present, and 2) removal of contaminants by <br /> personnel or equipment leaving the site . The possibility of <br /> exposure or movement of substances can be reduced or eliminated in <br /> a number of ways, including the following: <br /> - Setting up security and physical barriers to exclude <br /> unnecessary personnel from the general area. <br /> - Minimizing the number of personnel and equipment on site <br /> consistent with effective operations. <br /> - Establishing work zones within the site. <br /> - Establishing control points to regulate access to work zones . <br /> - Conducting operations in a manner to reduce the exposure of <br /> personnel and equipment and to eliminate the potential for <br /> airborne dispersion. <br /> - Implementing appropriate decontamination procedures . <br /> 10 . 7 . 3 Work Zones <br /> One method of preventing or reducing the migration of contaminants <br /> is to identify zones on the site in which various types of <br /> operations occur. Movement of personnel and equipment between <br /> zones and onto the site itself would be limited by access control <br /> points . By these means, three adjoining zones are recommended: <br /> Zone 1 - Exclusion Zone <br /> - Zone 2 - Contamination Reduction Zone <br /> Zone 3 - Support Zone <br /> 10-15 <br />