NYC-WTC_000195194

NYC 9/11 Public Portal Document

end of the work day, the entrance door on the Cedar Street side of the building was locked.

Where glass windows had been blown out, the temporary wood panels that had been installed for site security purposes were removed and reinstalled to afford complete closure. Intact windows were opened, and the jambs, sashes, and sills were cleaned thoroughly. The windows were then closed. In windows where an air conditioning unit was present, the air conditioning unit was removed from the window. The temporary protection on the exterior of the window was removed. The window cabinet that had housed the air conditioning unit was vacuumed, then covered with plastic to prevent air filtration. The air conditioning unit was vacuumed to remove loose dust, wrapped in plastic, and disposed. Wall mounted air conditioning units were removed from the wall, and sealed in plastic. The wall cabinet that had housed the air conditioning unit was vacuumed, then covered with plastic to prevent air infiltration. The air conditioning unit was vacuumed to remove loose dust, wrapped in plastic, and disposed. Disposal of the air conditioning units and installation of new self-contained ductless systems was performed by the building owner following completion of the study.

Waste Management. At the onset of the project, due to limited space outside the building, it was necessary to line the hallways with plastic and to temporarily locate the items to be disposed, including personal possessions, until a roll-off container could be procured. As cleaning progressed, waste was accumulated and staged in the common areas by the elevator until a sufficient quantity was gathered to fill a roll-off container. The waste was wrapped in plastic to avoid cross-contamination of the hallways leading to the roll-off container. The removed materials were hand-carried through the hallways and down the stairwell to the roll-off container located outdoors, because the elevator was not functioning.

Vacuuming. Vacuuming commenced at the entrance doorway of the unit. Working from the ceiling to the floor, toward the furthest area of the unit, all surfaces were vacuumed of loose dust and debris. Walls, ceilings, doors, pipes, ledges, closets, cabinets, shelving, trim, fixtures, and electrical outlets were vacuumed as they were encountered. Upon reaching the furthest point in the unit, the direction of cleaning was reversed and the same cleaning procedures were followed while returning to the point of origin at the entrance doorway. This procedure accomplished the cleaning of each unit twice using the designated cleaning method.

Wet Wiping. Wet wiping was performed on all horizontal surfaces to remove dust. The WRS cleaning crew applied wet wiping to all horizontal surfaces, including the floor, as they progressed from the furthest point of the interior of the unit back to the door. Wet wiping was the last activity performed in the unit.

Cleaning Air Conditioning Units. As noted in Section 2.1 above, two types of air conditioning systems were used in the residential living spaces: window/wall mounted air conditioners, and ceiling-mounted ductless air conditioners with remote condenser/compressor units. Bathroom fans also presented airflow routes that needed to be cleaned. Ceiling-mounted air conditioners were cleaned using HEPA-filtered equipment. The grills were removed to provide access to the interior. The condenser and compressor units on the roof were visually inspected and found to be clean. Removal of the ceiling cover to access the bathroom fan assemblies was necessary. The fan and motor were vacuumed; the fan housing was wet wiped. The interior of the exhaust duct was vacuumed to the first foot. The unit was reassembled and covered with poly sheeting. 18

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