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Final cleaning and monitoring scopes of work for WTC indoor

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EPA delivers final scopes of work for WTC indoor dust cleaning and monitoring program to DEP.

NYC-WTC_000138805–000138828

Folder label: “E-Mails Hotline M. Gilsenan

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NYC 9/11 Public Portal Document

9. Negative pressure ventilation equipment shall be installed and operated during all cleaning activities. Equipment shall run continuously until clearance air monitoring. A minimum ofone air change every 15 minutes shall be provided. When ducting to the outside is not possible, a second negative pressure ventilation unit compatible with the primary unit may be connected in series.

10. All WTC debris shall be misted and double-bagged. Accumulation ofwater is prohibited. Water misting shall be sufficient to wet the material without water accumulations.

11. After the removal ofdebris, all surfaces will be cleaned in accordance with the procedures specified in Scope A. After all surfaces have been cleaned, a second cleaning shall be performed. This results in two full cleanings of all surfaces, with the following exception. Water extraction cleaning ofcarpets and fabric co veied iumiture will be conducted only once. Surfaces include but are not limited to walls, floors, ceilings, ledges, trims, appliances, equipment and furnishings.

12. Residents may identify and tag certain furnishings (e.g. carpets and fabric covered furniture) for disposal rather than cleaning. Disposal ofresidents’ personal property shall not occur without prior written authorization by the owner.

13. Disposal ofall wastes generated during ±e cleaning shall be die responsibility ofthe contractor. All waste generated shall be treaied as asbestos-containing material (ACM). Transportation and disposal of generated waste shall be in cernpliance with all applicable rules and regulations.

14. A Cleaning Checklist (to be developed by EPA) will be completed by the cleaning contractor as tasks are completed to document the progress of the cleaning.

15. An activity log will be maintained by the site supervisor.

16. The cleaning contract oi shall noti fr Che monitoring contractor immediately upon completion ofthe cleaning. The Monitoring Conuactor will conduct a tl lorough vi.sual inspection to verify the absence ofvisible dust accumulaticms. Ifdust is ebstaved, the cleaning contractor will reclean as necessary at no additional cost.

17. Air sampling shall be perfcmned by the ?,Ionitoring Contractor after the area is free of dust accumulations as determined by the Monitoring Contractor. The residence will be recleaned and retested if the clean-up criteria of0.0009 fibers/cc (PCME measured by TEM) is not achieved or if determined necessary by EPA. This clean-up criterion may be reevaluated and revised, if determined necessay’ based on field conditions and analytical limitations.

18. After successful clearance air rnoiucoring, isciation c ani ers shall be removed in conjunction with the use of a HEPA vacuum.

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NYC-WTC_000138827

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NYC-WTC_000138827Source: NYC Law Department, mirrored locally

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