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2. Substances with a high degree of hazard to the skin are <br /> known or suspected to be present, and skin contact is <br /> possible; or <br /> 3. Operations must be conducted in confined, poorly <br /> ventilated areas, and the absence of conditions <br /> requiring Level A have not yet been determined. <br /> II. Level B protection shall be used when: <br /> 1. The type and atmospheric concentration of substances <br /> have been identified and require a high level of <br /> respiratory protection, but less skin protection. <br /> 2. The atmosphere contains less than 19.5 percent oxygen; <br /> or <br /> 3. The presence of incompletely identified vapors or gases <br /> is indicated by a direct-reading organic vapor detection <br /> instrument, but vapors and gases are not suspected of <br /> containing high levels of chemicals harmful to skin or <br /> capable of being absorbed through the skin. <br /> Note: This involves atmospheres with IDLH concentrations of <br /> specific substances that present severe inhalation <br /> hazards and that do not represent a severe skin hazard; <br /> or that do not meet the criteria for use of air- <br /> purifying respirators. <br /> III. Level C - Level C protection shall be used when: <br /> 1. The atmospheric contaminants, liquid splashes, or other <br /> direct contact will not adversely affect or be absorbed <br /> through any exposed skin; <br /> 2. The types of air contaminants have been identified, <br /> concentrations measured, and an air-purifying respirator <br /> is available that can remove the contaminants; and <br /> 3. All criteria for the use of air-purifying respirators <br /> are met. <br /> Site Safety 4 Health Plan Rev./1.0 95 <br /> October 20, 1997 <br />