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DEP Final Notice Regarding WTC Debris Cleanup, 83 Nassau Street,

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Final notice urging building owner to participate in city debris cleanup program for exterior surfaces.

NYC-WTC_000100652–000100668

Folder label: “83 NASSAU STREET 1001213, 79/3”

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NYC 9/11 Public Portal Document

FILE No.132 09/05 '02 16:45 ID: FAX: PAGE 16

Building Facade Clean-op

Work shall be performed by a NYSDOL. licensed asbestos contractor with NYC7)bP and NYSI)OL asbestos certified workers.

The contractor performing the cleaning should be experienced in cleaning building facades.

The clean up area shall he specified ("specified area") by DEP. The area below the fuade cleaning shall he covered with a layer of polyethylene sheeting. All debris must he collected fir disposal as ACM directly upon removal from the surface. (i.e. All waste must he double bagged in ACM waste labeled bags.) Running water or water runoff on the building facade is not permitted.

Building occupants shall he notified prior to the facade cleaning. Access to the street below the facade cleaning shall he restricted and marked with caution tape. ('leaning shall not he performed during wind speeds greater than 20 mph.

All Ii.VAC systems and air conditioners shall he turned off. All windows shall he closed during the cleaning of the building. Some air condilioners and windows may require sealing with duct tape 1:0 prevent water penetration.

In cases where equipment.,, is. rigged I' omthe .fc}ot': All clean-up activities on the roof must be completed prior to rigging equipment from the roof.

All horizontal surfaces and all windows on the facade shall be cleaned of large bulk material by wetting and hand brushing or scraping with non-metallic bristle brushes or non-metallic scrapers, by wet wiping and/ or by FILWA vacuuming from top to bottom. Only water shall be used for wet wiping and low- pressure washing. Detergents, solvents, additives, and any other chemical cleaning agents are prohibited. 'the removed material shall he immediately placed into containers (e.g. hags). Windows shall he wet wiped. Prue running water shall not be evident during this procedure. Power for Hl-PA vacuums shall be supplied through ground fault, interrupters.

Alter completion of debris removal, the specified area shall be carefully washed. A low pressure washing technique, moving from top to bottom, shall be employed to minimize water bounce-back. Facades shall he washed with a low-pressure wash not to exceed 250 psi.

At the completion of work, a visual inspection of I.he abated surfaces and sidewalk shall he performed to verify the absence of visible debris.

Air monitoring shall he performed by an independent.. NYSDOL licensed third party air monitoring thin with certified workers.

In order to minimize disruption to the public and to the building occupants, it is recommended this work he performed during off-hours.

Page 5 05/113/1)2

NYC-WTC 000100667

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NYC-WTC_000100667Source: NYC Law Department, mirrored locally

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