Chain of custody form for DEP environmental samples, 2001

NYC 9/11 Public Portal Document

possible. The common areas were re-cleaned as necessary due to traffic.

Stairwells were cleaned commencing at the Cedar Street doorway vestibule starting in the stairwell at the ground entrance and proceeding to the rooftop access door. The stairwells were then re-cleaned, following the same route back. The ceilings, walls, handrails, balusters, treads, risers, fire protection equipment, lighting, and trim were cleaned.

The hallways of each floor were accessed through fire doors at the stairwell platform for each floor. Access to each floor remained closed until each stair well had been cleaned from bottom to top, and from top to bottom. The hallways were cleaned in the same maimer as the stairwells, except that not all of the hallway walls were wet wiped. The second floor hallway floor was covered with vinyl tile. It was wet wiped. However, the third and fourth floor walls were made of plywood. Wallpaper originally applied to the wall surfaces had been removed, leaving a rough paste finish that was not conducive to wet wiping.

Each hallway contained a utility room with a wall-enclosed trash chute that led to the basement of the building. Some items were discovered in the utility closets. Boxes that were unopened were vacuumed and left in place. Other items were packaged for disposal. The utility areas did not seem to be impacted by WTC dust.

An elevator accessing each floor was located on the Cedar Street side of the building. It was not operational for the first two months of the project. Eventual repair of the elevator by others allowed access to the inner compartment. The elevator cab and the exterior top of the cab were vacuumed.

Basement (stu^) The basement of the building is comprised of separate rooms: a trash compactor room, a motor room associated with the elevator shaft, a common access area fi'om the street, and a fire protection equipment room. The brick walls of the basement were encrusted with mud, indicating a high water level at some time in the building's history. These rooms were cleaned using commercial HEPA equipment. Loose debris related to stone and mortar deterioration was vacuumed from the walls and ledges of the base of the elevator shaft. Small rocks, paper, debris, and rodent carcasses were removed.

2.8 Cleaning of Non-Study Commercial Units

As discussed in Section 2.1, three commercial units were cleaned at the conclusion of the study, although they were not part of the study: Lemongrass Grill, the Food Exchange and the Barber Shop. These units were cleaned using cleaning methods as presented in Attachment H, Synopsis of Cleaning Methods by Building Area and Facts Sheets.

The sequence of procedures for vacuuming, wet wiping, waste management, and pre-cleaning and post-cleaning sampling mirrored the procedures used in the residential units. Management of waste was accomplished as the cleaning activities occurred. Disposal of debris was handled in the same manner as in the residential units. Cleaning of the HVAC systems presented the only significant difference from the cleaning procedures used in the residential units. A discussion of the procedures used to clean the HVAC systems follows.

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