Asbestos contractor permit application, 114 Liberty Street, Oct 2001

NYC 9/11 Public Portal Document

FT Cleaning Procedures For

area may be established. Work shall proceed from the 12`" floor down to the first floor. The use of a remote decontamination enclosure system is acceptable. Prior approval must be received from the NYCDEP for decontamination enclosure system placement and phasing of clean-up activities, if required.

(8) An entry/exit log in compliance with the requirements set forth in Title 15, Chapter 1 of the RCNY shall be maintained in the clean room. The site supervisor shall maintain an activity log.

(9) Initially, the interior of the elevator shaft, including the top of the elevator car and the elevator pit, shall be HEPA vacuumed and wet wiped to allow for the use of the elevator during the clean up. Once the clean up throughout the building is complete, the elevator shaft, including the top of the elevator car and the elevator pit, shall be re-cleaned prior to clearance air monitoring.

(10), Isolation barrier locations (i.e.: wall or ceiling penetrations, windows, vents, doors, etc.) shall be HEPA vacuumed and wet wiped prior to installing two-layers of 6-mil polyethylene sheeting and sealed with tape. Window wells, ledges, guards, etc., that are accessible from the interior shall be cleaned.

(11) Negative pressure ventilation equipment shall be installed and operated continuously 24 hours per day during all clean-up activities. Equipment shall run continuously until clearance air monitoring. A minimum of one air change every 15 minutes shall be provided. When ducting to the outside is not possible, a second negative air unit compatible with the primary unit may be connected in series.

(12) All debris and/or dust shall be misted and double bagged. Accumulation of water is prohibited. Water misting shall be sufficient to wet the material without water accumulations. Caution shall be taken to avoid wetting items that may be damaged by wet methods. An encapsulating agent shall not be applied. Fallen pieces of fireproofing shall be wetted and bagged directly. Once all surfaces have been wet wiped and HEPA vacuumed a second cleaning shall be performed. Surfaces include but are not limited to walls, floors, ceilings, ledges, windowsills, trims, appliances, equipment, personal items, and furnishings. Drop ceilings shall be HEPA vacuumed. Care shall be taken not to disturb the fireproofing or damage the ceiling.

(13) Surfaces that may not be wet wiped shall be HEPA vacuumed three times or disposed as ACM waste. Disposal of material may not occur without prior authorization by the building owner and/or tenant, as applicable. Items identified by tenants for cleaning that cannot be cleaned shall be immediately brought to the attention of DEP. DEP will provide a determination. Any agreement to dispose the item(s) must be received in writing from the owner and/or tenant as applicable.

(14) The substrate beneath buckled floors shall be exposed by the contractor and cleaned (authorization from owner shall be obtained). Removed flooring shall be wrapped in two-layers of polyethylene sheeting, sealed with tape, and appropriately labeled. The contractor shall not be responsible for replacement of the floor.

(15) Tenant and/or owner, as applicable, must identify items to be cleaned or disposed. Tags shall be placed on items to be cleaned. The contractor shall dispose untagged items unless otherwise indicated in this scope of work. Special conditions or handling instructions may also be specified within units. These include items/locations not to be incorporated in this scope of work. Tenants

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NYC-WTC 000100687