NYC-WTC_000233286

NYC 9/11 Public Portal Document

56-7.11 (a) and all seams of HVAC or other system components that pass through a regulated abatement work area shall be sealed prior to beginning Phase II B work for each regulated abatement work area on the project. The critical and isolation barriers shall be removed only after satisfactory clearance air sampling results have been obtained. (4) Limitations. Full regulated abatement work area enclosure preparation as per Section 56-7.11 (e) is not required if the following removal conditions are followed: (i) The ACM, PACM or asbestos material must be intact, and the wetted pipe/duct/conduit shall be wrapped in two (2) independent layers of at least six (6) mil fire-retardant plastic sheeting and sealed airtight. (ii) A one-layer dropcloth of at least six (6) mil fire-retardant plastic sheeting shall be utilized below the ACM, PACM or asbestos material during all wrapping operations. (iii) Insulation removals to allow for cuts of pipe/duct/conduit and cuts for removal of ACM pipe/duct/conduit or sections thereof shall be performed using glovebag procedures within a negative pressurized tent enclosure, per Section 56-8.4(a). (c) Removal. Removal of the wrapped ACM and asbestos material shall proceed as per the requirements of Subpart 56-8. (d) Final Cleaning and Clearance Procedures. Final clean-up and clearance procedures for abatement shall comply with Section 56-9, except that only one stage of cleaning (final) is to be performed. Lockdown encapsulant use is not required, except as indicated for glovebag procedures. (e) Final Waste Removal From the Site. The requirements of Subpart 56-10 shall apply, once all asbestos project regulated abatement work areas have been completed.

12 NYCRR56 Subpart 11, Page 109

CITY_21MC100_0 03235129

NYC-WTC_000233395