NYC-WTC_000233286

NYC 9/11 Public Portal Document

(1) Timing - Removai of Saivage. Objects that can be removed from the regulated abatement work area without disturbing friable ACM prior to beginning Phase II B abatement procedures shall be completed as follows. The removal of nonporous, movable or non-movable salvage shall occur after critical barriers, isolation barriers and decontamination enclosures are in place in that portion of the building or structure, and only after salvage has been wet-cleaned and HEPA-vacuumed. (2) Fioor, Waii & Ceiiing Piasticizing and Seaiing. All porous floor, wall and ceiling surfaces, except where abatement of ACM, PACM or asbestos material shall be performed on those specific surfaces, shall be covered with one (1) layer of, at a minimum, six (6) mil fire-retardant plastic sheeting. The floor shall be plasticized first, and its plastic sheeting shall extend up the walls a distance of at least twelve (12) inches on all sides. The walls shall then be plasticized by applying plastic sheeting from the ceiling to the floor, overlapping the floor sheeting by at least twelve (12) inches. Next, the ceiling shall be plasticized, overlapping the walls by at least twelve (12) inches, to form a secure airtight seam. If the floor surface is not to be plasticized, it shall be made watertight. All seams in the plastic shall be sealed watertight and airtight. (3) Suspended Ceilings. Suspended ceiling tiles and T-grid components in proximity to friable ACM shall remain in place until the regulated abatement work area has been fully prepared in accordance with this Section, and electrical and HVAC systems have been shut down. These potentially contaminated suspended ceiling components shall be removed at the completion of the remaining work area preparation, including establishment of negative air ventilation systems, prior to commencement of Phase II B activities. These removed ceiling components shall be bagged/containerized and disposed of as asbestos waste. (4) Elevators. Elevators running through the regulated abatement work area shall conform to the following: (i) The elevator door in the regulated abatement work area shall be enclosed per Section 56-7.11 (d). (ii) Elevators not remaining in use shall have the fuses removed and the power switch locked in the open position. (iii) Elevator shafts shall not be used as waste chutes for asbestos waste material. (iv) Elevators that remain in use shall conform to the additional procedures to minimize the piston effects. fa; Elevator controls shall be modified to bypass the regulated abatement work area. A third (final) layer of polyethylene is to be duct taped airtight but with slack so as to form a larger perimeter diaphragm. Air leakage across the barrier shall be corrected upon

12 NYCRR56 Subpart 11, Page 100

CITY_21MC100_0 03235120

NYC-WTC_000233386