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® 5. Pressure demand SCBA or pressure demand supplied-air full-face masks shall <br /> ® be used when entering areas containing oxygen-deficient atmospheres, <br /> ® unknown atmospheres, or atmospheres considered to be at or above IDLH <br /> levels. Personnel (with appropriate SCBA apparatus) will not enter IDLH <br /> ® environments without emergency justification by and approval of a site safety <br /> manager or responsible project manager. An emergency is constituted by an <br /> ® already existing life threatening situation. <br /> ® 6. The length of time an APR canister or cartridge is effective in removing <br /> ® hazardous material from the ambient air will depend on the type and <br /> S concentration of hazardous material in the air and the level of effort required for <br /> a worker to accomplish his assigned tasks. The higher the breathing rate, the <br /> ® more frequently canisters will need to be replaced. These maximum operating <br /> ® periods vary according to manufacturer, so it-will-be necessary to monitor the <br /> ® total usage of cartridges and canisters during all work requiring a respirator. <br /> ® P. SPECIAL CONDITIONS <br /> ® Certain types of work may present unusual problems at certain sites with special <br /> ® conditions. Examples include the following: <br /> ® 1 . For protection against infectious waste, a Tyvek suit, appropriate gloves and <br /> boots, and a NIOSH-approved respirator with a high-efficiency particulate filter <br /> ® (HEPA) incorporated in the mask canister or cartridge, are suggested. <br /> ® Personnel should avoid or minimize contact with any waste, and be cautioned <br /> about possible contact with sharp objects such as needles. The HEPA filter <br /> may be combined with an OV/AG cartridge or canister. <br /> 2. For protection against gas vapors while drilling or while working around an open <br /> well casing, a NIOSH-approved full-face air-purifying respirator with an OV/AG <br /> canister including a HEPA filter may be necessary. The Saranex or Tyvek suit <br /> are also required. Also, appropriate gloves and boots. Appropriate measures <br /> ® must be taken to prevent heat stress. <br /> ® 3. For protection from asbestos fibers, the minimum required includes a respirator <br /> with a HEPA filter and a Tyvek suit. The Tyvek suit may either be coated or <br /> ® uncoated. Special regulations exist for asbestos, for complete requirements see <br /> �) the Asbestos Standard, 29 CFR 1910.1001 . <br /> ® 4. A determination may need to be made regarding whether additional protection <br /> ® will be required, if significant levels of vinyl chloride or benzene (or other more <br /> tort chemicals) are found during characterization_ The action levels for vinyl <br /> chloride and benzene are one-half of 1 ppm_ The maximum threshold limit <br /> ® 1:25 <br />