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0 0 <br /> functions involve a high potential for splash, immersion, or exposure to unexpected vapors, <br /> gases, or particulates of materials that are harmful to skin or capable of being absorbed through <br /> the skin. <br /> 2. Substances with a high degree of hazard to the skin are known or suspected to be present, <br /> and skin contact is possible; or <br /> 3. Operations are being conducted in confined, poorly ventilated areas, and the absence of <br /> conditions requiring Level A have not yet been determined. <br /> LEVEL B <br /> 1. The type and atmospheric concentration of substances have been identified and require a <br /> high level of respiratory protection, but less skin protection; and/or <br /> 2.The atmosphere contains less than 19.5 percent oxygen; or <br /> 3. The presence of incompletely identified vapors or gases is indicated by a direct-reading <br /> organic vapor detection instrument, but vapors and gases are not suspected of containing high <br /> levels of chemicals harmful to skin or capable of being absorbed through the skin. <br /> NOTE: This involves atmospheres with IDLH concentrations of specific substances that present <br /> severe inhalation hazards and that do not represent a severe skin hazard; or that do not meet <br /> the criteria for use of air-purifying respirators. <br /> LEVEL C <br /> 1. The atmospheric contaminants, liquid splashes, or other direct contact will not adversely <br /> affect or be absorbed through any exposed skin; <br /> 2. The types of air contaminants have been identified, concentrations measured, and an air- <br /> purifying respirator is available that can remove the contaminants;and <br /> 3.All criteria for the use of air-purifying respirators are met. <br /> LEVEL D <br /> 1.The atmosphere contains no known hazard; and <br /> 2. Work functions preclude splashes, immersion, or the potential for unexpected inhalation of, or <br /> contact with, hazardous levels of any chemicals. <br /> NOTE: As stated before, combinations of personal protective equipment other than those <br /> described for Levels A, B, C, and D protection may be more appropriate and may be used to <br /> provide the proper level of protection. <br /> 16s®[tom tic-' <br /> P:\707 Cove Contractors\Groundwater\Well Installation Workplans\SHSP\SHSP_FINAL.doc <br />