NYC-WTC_000199812

NYC 9/11 Public Portal Document

then be wet-wiped with amended water containing a non-sudsing surfactant. No surface should be dry swept or dusted because this will re-entrain the dust. Upholstery and carpets should be HEPA-vacuumed and cleaned using either steam or a hot-water extraction method (Kominsky et. al, 1990). All clothing, linens, and other similar items should be laundered.

4) The heating, ventilation, and air-conditioning (HVAC) system should be inspected. If the system was in operation during or after the September 11* incident, it may contain asbestos-contaminated dust. An environmental consultant should be consulted to determine the most efficient procedures to clean the system including the air-handling unit and ventilation ducts (supply and return).

5) A suitable re-occupancy clearance criterion needs to be established. This criterion can be based on a thorough visual inspection and/or air testing.

6) To prevent or minimize the outdoor dust from entering the apartment; (1) keep windows closed and repair all broken glass; (2) set the air-conditioner to re-circulate air (closed vents), change the filter initially and frequently thereafter; and (3) remove shoes before entering the apartment.

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CITY_21MC100_006730130

NYC-WTC_000199860