NYC-WTC_000233286

NYC 9/11 Public Portal Document

(1) Recleaning. If the results of inside work area group of air samples are unsatisfactory, recleaning of regulated abatement work area surfaces using wet methods is required, with the negative air pressure equipment operating as per the requirements of this Part. If only the results of the outside work area group of air samples are unsatisfactory, clean-up of surfaces outside of the regulated abatement work area using HEPA- vacuums and wet-cleaning methods shall be performed. (2) Collection of New Samples. (i) If the results of inside work area group of air samples are unsatisfactory, after recleaning of work area surfaces, clearance air sampling shall not commence until the appropriate waiting/settling or drying time requirement as per Section 56-9.2(f) has elapsed and no visible asbestos debris/residue, pools of liquid, or condensation remain, then collection and analysis of an additional full set (both inside and outside work area samples) of clearance air samples as required by Section 56-9.2(d) shall be completed. Samples shall be placed in the same positions as before, and the new samples analyzed for concentrations of airborne fibers. (ii) If only the results for the outside work area group of air samples are unsatisfactory, following clean-up of surfaces outside of the regulated abatement work area, collection and analysis of an additional group of outside work area clearance air samples as required by Section 56-9.2(d) shall be completed. Samples shall be placed in the same positions as before, and the new samples analyzed for concentrations of airborne fibers. (3) Repeating Air Sampiing and Anaiysis. The requirements of this Subdivision shall be repeated until satisfactory clearance air sampling results have been achieved, for all non-exempt regulated abatement work areas throughout the entire work site. 56-9.3 Dismantling of Regulated Abatement Work Area.

(a) Collapsing and Containerizing of Tent Enclosures. Each tent enclosure and airlock shall not be dismantled until clearance air sampling has been performed and satisfactory results obtained. The plastic sheeting which formed the tent, airlock, and the contents thereof, shall be fully collapsed, starting from the top and working downward. The tent and contents shall be placed in at least a six (6) mil plastic bag or hardwall container, sealed airtight with duct tape and removed for disposal. The plastic sheeting shall be treated as contaminated material and properly disposed of as asbestos waste.

(b) Removal of Tools and Equipment All remaining tools and equipment shall be removed from the regulated abatement work area after proper decontamination as per this Part.

12 NYCRR56 Subpart 9, Page 91

CITY_21MC100_0 03235111

NYC-WTC_000233377