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measured (or potential for) high concentration of <br /> atmospheric vapors, gases, or particulates; or <br /> site operations and work functions involving high <br /> potential for splash, immersion, or exposure to <br /> unexpected vapors, gases, or particulates of materials <br /> highly toxic to the skin. <br /> • Substances with a high degree of hazard to the skin are known <br /> or suspected to be present, and skin contact is possible. <br /> • Operations must be conducted in confined, poorly ventilated <br /> areas until the absence of substances requiring Level A <br /> Protection is determined. <br /> • Direct readings on field Flame Ionization. Detectors (FID) or <br /> Photoionization Detectors (PID) and similar instruments <br /> indicate high levels of unidentified vapors and gases in the <br /> air. <br /> 2 . Leval B Pro -ani-ion <br /> a . Personal protective equipment <br /> • Supplied-air respirator , (MSHA/NIOSH approved) .. Respirators. <br /> may be either. of the following types: <br /> pressure-demand, self-contained breathing apparatus; or <br /> - pressure-demand, airline respirator (with escape bottle <br /> for atmospheres that are IDLH or where the potential for <br /> IDLH conditions exists) <br /> • Chemical-resistant clothing (overalls and long-sleeved <br /> jacket; hooded, one or two-piece chemical-splash suit; <br /> disposable chemical-resistant, one-piece suits) <br /> • Long cotton- underwear (optional) <br /> • Coveralls (optional) <br /> • Gloves (outer) , chemical-resistant <br /> • Gloves (inner) , chemical-resistant <br /> • Boots (outer) , chemical-resistant, steel toe and shank <br /> • Boots (outer) , chemical-resistant, disposable (optional) <br /> • Hard hat - face shield (optional) <br /> 10-10 <br />