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Revised scopes of work for indoor dust cleaning program, August

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EPA transmits revised scopes of work documents for the indoor dust cleaning and monitoring program, including cleaning SOW #7 and monitoring SOW #7.

NYC-WTC_000139101–000139149

Folder label: “2003 E-Mails Sent M Gilsenan

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NYC 9/11 Public Portal Document

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. When conducting cleaning ofcommon space in apartment buildings, the elevator control shall be modified to bypass the work area.

11. Prior to any cleaning ofcommon spaces, isolation barriers (i.e. sealing offofall openings, including but not limited to windows, corridors, doorways, barriers, skylights, ducts, grills, diffusers, and any other penetrations ofthe workplace) shall be installed with two layers of6-mil plastic sheeting sealed with tape. All seams ofHVAC or other system components that pass through the work place shall also be sealed. All openings shall be HEPA vacuumed prior to constructing the isolation barrier.

12. 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.

13. 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 ofall surfaces, with the following exception. Water extraction cleaning ofcarpets and fabric covered furniture will be conducted only once. Surfaces include but are not limited to walls, floors, ceilings, ledges, trims, appliances, equipment and furnishings.

14. 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.

15. Disposal ofall wastes generated during the cleaning shall be the responsibility ofthe contractor. All waste generated shall be treated as asbestos-containing material (ACM). Transportation and disposal of generated waste shall be in compliance with all applicable rules and regulations.

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

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

18. The cleaning contractor shall notify the monitoring contractor immediately upon completion ofthe cleaning. The Monitoring Contractor will conduct a thorough visual inspection to verifythe absence ofvisible dust accumulations. Ifdust is observed, the cleaning contractor will reclean as necessary at no additional cost.

19. Air sampling shall be performed by the Monitoring Contractor after the area is free of dust

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NYC-WTC_000139110

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NYC-WTC_000139110Source: NYC Law Department, mirrored locally

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