Forwarding WTC air monitoring scope for final review, Aug 2002

NYC 9/11 Public Portal Document

n. 763, Subpt. E, App. B 40 CFR Ch. I (7-1-00 Edition) should therefore be used whenever feasible. Tyvek' material (the same material used to Wet methods can be used In the great major­ make the disposal protective suits used In ity of workplace situations. Only In cases major asbestos removal, renovation, and where asbestos work must be performed on demolition operations and In protective live electrical equipment, on live steam gloves). Glove bags are readily available Unes, or In other areas where water will seri­ from safety supply stores or specialty asbes­ ously damage materials or equipment may tos removal supply houses. Glove bags come dry removal be performed. Amended water or pre-labelled with the asbestos warning label another wetting agent should be applied by prescribed by OSHA and EPA for bags used means of an airless sprayer to minimize the to dispose of asbestos waste. extent to which the asb^tos-contalnlng ma­ Glove bag equipment and supplies. Supplies terial Is disturbed. and materials that are necessary to use Asbestos-containing material should be glove bags effectively Include: wetted from the Initiation of the mainte­ 1. Tape to seal glove bag to the area from nance or renovation operation and wetting which asbestos is to be removed. 2. Amended water or other wetting agents. agents should be used continually through­ 3. An airless sprayer for the application of out the work period to ensure that any dry the wetting agent. asbestos-containing material exposed In the 4. Bridging encapsulant (a paste-llke sub­ course of the work Is wet and remains wet stance for coating asbestos) to seal the rough until final disposal. edges of any asbestos-containing materials Removal of small aaiount of asbestos-con­ that remain within the glove bag at the taining materials. Several methods can be points of attachment after the rest of the as­ used to remove small amounts of asbestos­ bestos has been removed. containing materials during small-scale, 5. Tools such as razor knives, nips, and short-duration renovation or maintenance wire brushes (or other tools suitable for cut­ tasks. These Include the use of glove bags, ting wires, etc.). the removal of an entire asbestos-covered 6. A HEPA filter-equipped vacuum for pipe or structure, and the construction of evacuating the glove bag (to minimize the mlnlenclosures. The procedures that employ­ release of asbestos fibers) during removal of ers must use for each of these operations If the bag from the work area and for cleaning they wish to avail themselves of the rule’s any material that may have escaped during exemptions are described In the following the Installation of the glove bag. sections. 7. HEPA-equlpped dual-cartridge or more Glove bags. OSHA found that the use of protective respirators for use by the employ­ glove bags to enclose the work area during ees involved In the removal of asbestos with small-scale, short-duration maintenance or the glove bag. renovation activities will result In employee Glove bag work practices. The proper use of exposure to asbestos that are below the glove bags requires the following steps: rule’s action level of 0.1 f/cm’. This appendix 1. Glove bags must be Installed so that provides requirements for glove-bag proce­ they completely cover the pipe or other dures to be followed by employers wishing to structure where asbestos work is to be done. avail themselves of the rule’s exemption for Glove bags are Installed by cutting the sides each activity. OSHA has determined that the of the glove bag to fit the size of the pipe from which asbestos is to be removed. The use of these procedures will reduce the 8- glove bag is attached to the pipe by folding hour time weighted average (TWA) exposure the open edges together and securely sealing of employees Involved In these work oper­ them with tape. All openings In the glove ations to levels below the action level and bag must be sealed with duct tape or equiva­ will thus provide a degree of employee pro­ lent material. The bottom seam of the glove tection equivalent to that provided by com­ bag must also be sealed with duct tape or pliance with all provisions of the rule. equivalent to prevent any leakage from the Glove bag Installation. Glove bags are ap­ bag that may result from a defect In the bot­ proximately 40-lnch-wlde times 64-lnch-long tom seam. bags fitted with arms through which the 2. The employee who Is performing the as­ work can be performed. When properly In­ bestos removal with the glove bag must don stalled and used, they permit workers to re­ at least a half mask dual-cartridge HEPA- main completely Isolated from the asbestos equlpped respirator: respirators should be material removed or replaced Inside the bag. worn by employees who are in close contact Glove bags can thus provide a flexible, easily with the glove bag and who may thus be ex­ Installed, and quickly dismantled temporary posed as a result of small gaps in the seams small work area enclosure that Is Ideal for of the bag or holes punched through the bag small-scale asbestos renovation or mainte­ by a razor knife or a piece of wire mesh. nancejobs. These bags are single-use control devices that are disposed of at the end of ‘Mention of trade names or commercial each Job. The bags are made of transparent 6- products does not constitute endorsement or mll-thlck polyethylene plastic with areas of recommendation for use.

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