NYC-WTC_000233286

NYC 9/11 Public Portal Document

abatement work area, adjacent areas or downstream non-work areas. (b) HVAC Filters and Ducts. Potentially contaminated HVAC filters in existing building/structure HVAC systems shall be handled and disposed of as asbestos contaminated waste material. The ducts and filter assembly shall be wet cleaned and HEPA-vacuumed where system air samples or bulk samples indicate asbestos contamination within the interior of the HVAC ducts. Existing building/structure HVAC system filters shall be treated as potentially contaminated for all friable OSHA Class I and Class II asbestos projects, and shall be removed and disposed of by the asbestos abatement contractor after the affected filters are identified by the building/structure owner’s HVAC contractor or maintenance personnel. The building owner or their agent shall supply appropriate replacement HVAC system filters to the asbestos abatement contractor during HVAC system filter removal and replacement. (c) Chimney Effects. All boilers and other equipment exhausts within the regulated abatement work area shall be shut down and the burner/boiler/equipment accesses and openings shall be sealed until abatement is complete and satisfactory clearance air-sampling results have been achieved. If the boiler(s) or other exhausted equipment will be subject to abatement, all breeching, stacks columns, flues, shafts and double-walled enclosures serving as exhausts or vents, shall be segregated from the affected boilers or equipment and sealed airtight to eliminate potential chimney effects within the regulated abatement work area.

56-7.10 Regulated Abatement Work Area Pre-Cleaning. (a) Movable Objects. Movable objects within the regulated abatement work area shall be precleaned using HEPA-filtered vacuum equipment and/or wet cleaning, and such objects shall be removed from the regulated abatement work area to an uncontaminated location. Upholstered furniture and drapes shall be HEPA- vacuumed twice before removal from the regulated abatement work area. Carpeting shall be HEPA-vacuumed twice and cleaned before removal from the regulated abatement work area. If disposed of as asbestos-contaminated waste material, cleaning of carpeting is not required. If carpeting is left in place, it shall be covered with three-eighths (3/8) inch thick plywood sheathing prior to required plasticizing. (b) Fixed Objects. Fixed objects and other items which are to remain within the regulated abatement work area shall be precleaned using HEPA-filtered vacuum equipment and/or wet cleaning methods. Such objects and items shall be enclosed with two (2) layers of at least six (6) mil fire retardant plastic sheeting and sealed airtight with duct tape. (c) Precleaning. The regulated abatement work area shall be cleaned using HEPA- filtered vacuum equipment or wet cleaning methods or both. Methods that raise dust, such as sweeping or vacuuming with non HEPA-filtered equipment shall be prohibited. ACM, PACM or asbestos material shall not be disturbed during

12 NYCRR56 Subpart?, Page 65

CITY_21MC100_0 03235085

NYC-WTC_000233351