Forwarding WTC air monitoring scope for final review, Aug 2002

NYC 9/11 Public Portal Document

Environmental Protection Agency Pt. 763, Subpt. E, App. B 6. If the Z-statlstlc Is less than or equal to 3. Minor repairs to damaged thermal sys­ 1.65, the response action is complete. If the tem Insulation which do not require re­ Z-statlstic is greater than 1.65, reclean the moval. abatement site and collect a new set of sam­ 4. Repairs to a piece of asbestos-containing ples. wallboard. 5. Repairs, involving encapsulation, eqclo­ [52 FR 41857, Oct. 30, 1987] sure or removal, to small amounts of friable asbestos-containing material only if required APPENDIX B TO Subpart E—Work in the performance of emergency or routine Practices and Engineering Con­ maintenance activity and not Intended sole­ trols FOR Small-Scale. Short- ly as asbestos abatement. Such work may Duration Operations Mainte­ not exceed amounts greater than those nance AND Repair (O&M) Activi­ which can be contained In a single prefab­ ties Involving ACM ricated minienclosure. Such an enclosure shall conform spatially and geometrically to This appendix Is not mandatory. In that the localized work area. In order to perform LEAs may choose to comply with all the re­ its Intended containment function. quirements of 40 CFR 763.121. Section OSHA concluded that the use of certain en­ 763.91(b) extends the protection provided by gineering and work practice controls is capa­ EPA in its 40 CFR 763.121 for worker protec­ ble of reducing employee exposures to asbes- tion during asbestos abatement projects to tos to levels below employees of local education agencies who the final standard’s action level (0,1 f/cm’). perform smaU-scale. short-duration oper­ (See 51 FR 22714, Jime 20, 1986.) Several con­ ations. maintenance and repair (O&M) ac­ trols and work practices, used either singly tivities Involving asbestos-containing mate­ or in combination, can be employed effec­ rials and are not covered by the OSHA asbes­ tively to reduce asbestos exposures during tos construction standard at 29 CFR 1926.58 small maintenance and renovation oper­ or an asbestos worker protection standard ations. These include: adopted by a State as part of a State plan 1. Wet methods. approved by OSHA under section 18 of the 2. Removal methods. Occupational Safety and Health Act. Em­ 1. Use of glove bags. ployers wishing to be exempt from the re­ li. Removal of entire asbestos insulated quirements of §763.121 (e)(6) and {f)(2)(i) may pipes or structures. Instead comply with the provisions of this Ui. Use of minienclosures. 3. Enclosure of asbestos materials. appendix when performing small-scale. 4. Maintenance programs. short-duration O&M activities. This appendix describes these controls and Definition of Small-Scale. Short-Duration work practices in detail. Activities Preparation of the Area Before Renovation For the purposes of this appendix, small- or Maintenance Activities scale. short-duration maintenance activities The first step in preparing to perform a are tasks such as. but not limited to: small-scale, short-duration asbestos renova­ 1. Removal of asbestos-containing insula­ tion or maintenance task, regardless of the tion on pipes. abatement method that will be used, is the 2. Removal of small quantities of asbestos- removal from the work area of all objects containing insulation on beams or above that are movable to protect them from as­ ceilings. bestos contamination. Objects that cannot 3. Replacement of an asbestos-containing be removed must be covert completely with gasket on a valve. 6-mll-thlck polyethylene plastic sheeting be­ 4. Installation or removal of a small sec­ fore the task begins. If objects have already tion of drywall. been contaminated, they should be thor­ 5. Installation of electrical conduits oughly cleaned with a High Efficiency Par­ through or proximate to asbestos-containing ticulate Air (HEPA) filtered vacuum or be materials. wet-wiped before they are removed from the Small-scale, short-duration maintenance work area or completely encased in the plas­ activities can be further defined, for the pur­ tic. poses of this subpart, by the following con­ Wfet methods. Whenever feasible, and re­ siderations: gardless of the abatement method to be used 1. Removal of small quantities of asbestos­ (e.g.. removal, enclosure, use of glove bags). containing materials (ACM) only If required wet methods must be used during small- in the performance of another maintenance scale. short-duration maintenance and ren­ activity not Intended as asbestos abatement. ovation activities that involve disturbing as­ 2. Removal of asbestos-containing thermal bestos-containing materials. Handling asbes­ system insulation not to exceed amounts tos materials wet Is one of the most reliable greater than those which can be contained in methods of ensuring that asbestos fibers do a single glove bag. not become airborne, and this practice

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