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levels. Breathing zone refers to the area from the top of the shoulders to the top of the head. <br /> Explosivity levels associated with on site activities will be monitored with a combustible gas meter. This will be the <br /> primary source of information for determining the potential hazard due to explosion or fire in confined spaces and other <br /> enclosed areas with little or no ventilation. <br /> Prior to entry of any area that may contain an explosive or flammable atmosphere, the Site Safety Officer or designee <br /> will take representative readings of the suspect area. Representative readings include readings from top, middle, and <br /> lower levels of the area,and at various points at each level in larger areas. Areas in which any one reading exceeds 20% <br /> of the lower flammable limit will be considered potentially explosive, and will be vented to below 20% of the lower <br /> flammable limit before the introduction of any personnel or non-explosion proof powered equipment. <br /> 6 <br />