NYC-WTC_000233286

NYC 9/11 Public Portal Document

SUBPART 56-9 PHASE II C FINAL CLEANING AND CLEARANCE PROCEDURES 56-9.1 Final Cleaning Procedures. The following cleanup procedures shall be required after completion of Phase II B activities:

(a) Continuous Negative Pressure Ventilation. If required during Phase I IB, the negative pressure ventilation units shall remain in continuous operation during implementation of Phase I IC, including observance of settling/waiting periods and drying times.

(b) First Cleaning, Lockdown Encapsulation and Top Layer Removal. All surfaces of the regulated abatement work area shall be first wet-cleaned using rags, mops and sponges. For collecting excess liquid and wet debris, a wet purpose HEPA filtered shop vacuum may be used and shall be emptied prior to removal from the regulated abatement work area. When the first cleaning has been completed and the appropriate waiting/settling or drying time requirements of this Subpart have been met, a thin coat of a lockdown encapsulant agent shall be applied to all surfaces within the regulated abatement work area which were not the subject of removal or abatement. In no event shall lockdown encapsulant be applied to any surface which was the subject of removal or other abatement response activity, prior to obtaining satisfactory clearance air results for the regulated abatement work area. Once the lockdown encapsulant has been applied, the cleaned, exposed top barrier layer of plastic sheeting shall then be removed from walls, ceilings and floors. Windows, doors, HVAC system vents and other openings shall remain sealed. Decontamination system enclosures shall remain in place and shall continue to be utilized.

(c) Second Cleaning and Bottom Layer Removal. After the top layer of plastic sheeting has been removed, all objects and surfaces in the regulated abatement work area shall be HEPA-vacuumed and then wet-cleaned. After the second cleaning and waiting/settling or drying time requirements of this Subpart, then the remaining bottom layer of plastic sheeting on walls, ceilings and floors shall be removed. All windows, doors, HVAC system vents and all other openings shall remain sealed.

(d) Third or Final Cleaning and Visual Inspection. After the bottom layer of plastic sheeting has been removed, all objects and surfaces in the regulated abatement work area shall be HEPA-vacuumed and then wet-cleaned. After the final cleaning is complete, clearance air sampling shall not commence until the appropriate waiting/settling or drying time requirements of this Subpart have elapsed and a visual inspection has been completed to confirm that the scope of abatement work for the asbestos project is complete, and no visible asbestos debris/residue, pools of liquid, or condensation remain. This visual inspection shall be completed by an appropriately trained and certified project monitor, contracted by the building/structure owner, independent of the asbestos

12 NYCRR56 Subpart 9, Page 86

CITY_21MC100_0 03235106

NYC-WTC_000233372