NYCDOH/ATSDR asbestos residential sampling results, Apr 2002

NYC 9/11 Public Portal Document

”* 1: indoor; O: outdoor Vil. Interference from existing building materials

It is anticipated that some of the contaminants/materials found in this sampling effort will be un-related to the WTC event. Attempts will be made during sample collection to note other possible sources of contaminants (Section VIII, Information Needs for Samples/Sample Locations).

To better determine if contaminants/materials found are within area background levels, approximately five residential units outside of the concentric circle zones will be selected for testing (indoor air and surface dust, outdoor air and surface dust). Contaminant levels found inside and outside of the background homes, along with specific sample location information, will be considered when data interpretation is conducted.

VIIL Community Notification of Results

The analytical results along with a public health interpretation will be provided to the community in several different ways. All participants who allowed sampling in their home will be provided with their individual results. Each building owner/operator will be given results of all sampling conducting in the building. Results (without personal identifiers) will also be provided to all occupants of the building. Finally, all results (without personal identifiers) will be provided to residents in lower Manhattan.

In each instance, notification will include a summary of the results; a comparison of the results of samples collected in lower Manhattan with the results of samples collected as NYC background; a public health interpretation of the results; a discussion of the limitations of the data; and recommendations (if needed) that would reduce exposures.

These notifications will be prepared after all of the analytical data has been received. It is anticipated that notification will occur within 6-8 weeks after sampling is begun. However, data and its QA/QC will be reviewed as it is provided by the laboratory. If, results are found that indicate a more immediate notification is necessary (e.g., levels are found that pose a public health hazard), the participants who may be impacted will be notified as soon as possible. Based on the circumstances, this notification may include just residents in an individual unit, or it may include all residents in the building along with the building owner/operator. If such a notification is necessary, all involved public health agencies will take steps to ensure that it includes specific recommendations/actions that can be quickly implemented to reduce exposures below levels that pose a health hazard.

IX. Screening Values/Data Interpretation/Recommended Actions

Screening levels and actions are outlined in Appendix B.

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