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3. Toxic Substances Quantity in Parts per Million — PPM <br /> A. Benzene Vapors(ppm) Respirator Requirements <br /> No respirator required for up to 8 hours a <br /> 0- 1.0 day. <br /> No respirator required for up to 15 <br /> minutes. <br /> 1.1 — 5.0 A half-mask organic vapor (ov) cartridge <br /> respirator is required beyond 15 minutes <br /> for up to 8 hours of use. <br /> A half-mask (ov) cartridge respirator is <br /> 5.1 - 10 required for up to 8 hours of use. <br /> A full-face (ov) cartridge respirator is <br /> 10.1 — 40 required for up to 8 hours of use. <br /> Do not enter tank. Continue to vent tank <br /> Above 40 vapors down to acceptable levels. <br /> B. Petroleum Hydrocarbon Vapors (ppm) Respirator Requirements <br /> Less than 75 A respirator is optional but not required <br /> 76- 1000 A half mask (ov) cartridge respirator is <br /> required for up to 8 hours of use. <br /> A full face (ov) cartridge respirator is <br /> Above 1000 required for up to 8 hours of use. <br /> C. Styrene Vapors (ppm) Respirator Requirements <br /> A respirator is optional but not required <br /> Less than 75 <br /> 76 - 250 A half mask (ov) cartridge respirator is <br /> required for up to 8 hours of use. I <br /> A full face (ov) cartridge respirator is <br /> Above 250 required for up to 8 hours of use. <br /> 4. Combustible Dust airborne <br /> Wear a dust mask when grinding or cutting <br /> 5 feet or less fiberglass <br /> Concentrations of dust must be kept below their flammable limits. This can be <br /> approximated as a condition in which dust obscures vision at a distance of 5 feet or <br /> less. <br /> TABLE 2 cont'd. <br /> 29 <br />