Asbestos abatement technical specifications, 130 Cedar Street, July 2004

NYC 9/11 Public Portal Document

Asbestos Abatement Technical Specifications For 130 Cedar Street, New York, NY a) Critical barriers shall be placed on all windows and openings in the • work area. These shall be sealed and remain in place until final air clearance testing has been completed.

b) The work area shall be pre-cleaned with HEPA vacuums, as well as wet wiped where necessary, as directed by the Industrial Hygienist or foreman assigned to the project.

c) Two (2) layers of 6-mil, fire retardant polyethylene sheeting shall be placed on floors and walls and ceilings In order to provide protective barriers and to achieve negative air pressure inside the work area.

d) Negative air filtration equipment of sufficient quantity and capacity shall be determined on a per job basis. A minimum of 0.02 inches water column shall be achieved prior to the start of any abatement work. The capacity shall be enough to cause a complete air change or total air filtration within the work area four (4) times per hour.

4.4 Decontamination Chamber Construction/Maintenance:

a) In work areas where it is required, a three (3) stage decontamination (decon) chamber shall be constructed. This shall take place prior to any work being started in any area.

b) The chamber shall be composed of a series of three (3) rooms/spaces • set up in a consecutive arrangement from the work area to the outside atmosphere. If required, a decontamination trailer shall be provided to the workers and placed In an Isolated position in the uncontaminated environment.

c) The first, innermost room of the decon chamber shall be designated as the dirty or contamination room. It will be located at the closest proximity to the enclosed work area and separated by an airlock. This in turn shall be attached to a shower room by an air lock to prevent fiber release. This shower room, which the workers shall use to decontaminate themselves of all remaining asbestos fibers when exiting work area, shall be attached to the clean room/outer room. The clean room outer room shall be used as the entrance to the actual decon chamber. It is here where street clothes and uncontaminated personnel protective equipment shall be accessed.

d) Air locks used to separate the rooms shall be composed of fire- retardant, plastic doors and weighted to prevent contaminated air from escaping into the environment.

e) A minimum of two (2) layers of fire retardant, polyethylene shall be used for construction of a decontamination unit inside the work area, and a two (2) layer ceiling shall be used to protect the Integrity of the decon unit.

f) The decon chamber doors shall be of sufficient height and width to enable replacement of equipment that may fail during work

Prepared by JLC Environmental Consultants, Inc. Project No. 04-3271 Page 16

NYC-WTC 000125594