Residential sampling protocol, World Trade Center, Oct 2001

NYC 9/11 Public Portal Document

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table integrates the Environmental Assessment Workgroup multi-agency recommendations for reoccupation of residences in lower Manhattan (see attachment 1). It is important to note that the ultimate decision criteria for reoccupation is the ambient air level of asbestos. Bulk asbestos determinations are useful for (1) determining the po tential for recontaminating ambient air and (2) for determining the type of further sampling needed.

In general the sampling and resampling strategy encompasses testing of bulk material and clean up until such a time that further clean up will not lower bulk asbestos levels. Confirmation is made by air sampling; reoccupation of residents is acceptable below 0.01 f / cc.

ATSDR, with multi-agency concunence, has provided guidance for re-entry into New York City buildings and has concluded that the 0.1 f/cc OSHA PEL is not acceptable for schools or residences ( see attachment 1 ATSDR, CDC, EPA OSHA Environmental Assessment Workgroup Asbestos Action Levels for World Trade Center Response October 11, 2001).

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