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Although total vapor/gas concentration (ppm) measurements are useful for the selection of protective equipment, caution should be exercised in interpretation. An instrument does not r.. respond with the same sensitivity to several vapor/gas contaminants as it does to a single contaminant. Also, since �• total vapor/gas field instruments "see" all contaminants in relation to a specific calibration gas, the concentration of unknown gases or vapors may be over or under-estimated. V Suspected carcinogens , particulates , highly hazardous substances, infectious wastes , or other substances that do not elicit an instrument response may be known or suspected to be present. Therefore, the protection level should not be based solely on the total vapor/gas criterion . Rather, the level should be selected, case-by-case, with special emphasis on potential exposure from the chemical and toxicological characteristics of the known or suspected material . Vapors/gases with a very low Threshold Limit Value (TLV) or Immediately Dangerous to Life and Health (IDLH) value could be present. Total readings on instruments, not calibrated to . these substances , may not indicate unsafe conditions. V GASOLINE PRODUCTS : Gasoline consists mainly of straight chain and branched paraffinic ` hydrocarbons, olefins, cycloparaffins and aromatics . The benzene content normally varies from 0 . 2-3 . 5% with a typical value of 1 . 4% . Effects of Overexposure: ACUTE: V o EYES : May cause irritation, experienced as mild discomfort and seen as slight excess redness of the eye . First Aid Measures: Immediately flush eyes with plenty of water for at least 15 minutes . Hold eyelids apart while flushing to rinse surface of eye and lids with water. Get medical attention. Protective Equipment: Chemical-type goggles or face shield '- recommended to prevent eye contact . o SKIN: Prolonged or widespread skin contact may result in the v absorption of potentially harmful amounts of material . First Aid Measures: Wash skin with plenty of soap and water until all traces of material are removed . Remove and clean contaminated clothing . Destroy non-resistant footwear. Get ` medical attention if skin irritation persists or contact has been prolonged. Because of its irritating properties, repeated skin contact may aggravate an existing dermatitis (skin condition) . Protective Equipment : Protective clothing such as uniforms , coveralls or lab coats should be worn. Launder or dry-clean when soiled. Gloves and boots resistant to chemicals and petroleum distillates required. 3 V V