Ambient dust sampling protocol for residential areas, Oct 2001

NYC 9/11 Public Portal Document

****DRAFT Version 10, October 29, 2001**** f If sample results are higher than background, the results Will be compared to health screening guidelines. These screening levels are outlined in the next Section. If values are below screening guidelines, the health interpretation will stress that the levels of contaminants found are below those of public health concern. If values exceed the screening guidelines, then sample collection information (Section VIII) will be reviewed in detail to determine if a possible source or contributing source (e.g., remodeling activities, rc id construction) of the contaminant(s) is possible. If a possible source or contributing source is found, this information will be included in the interpretation of the results. If the possible source is controllable (e.g., sweeping with a broom), recommendations will be made that will reduce levels of contaminants. If no other source of the contaminant(s) is indicated and samp’e collection information indicates the <■ presence of variables associated with WTC-related dust (e.g., visible settled dust, windows open during WTC collapse), this information will be included in the interpretation of the results. Recommendations to clean (or re-clean) areas to reduce exposures will be made. A public health implications statement will be provided with each set of results. Note: we are working on an example PHI statement.

If levels of contaminants are found outdoors that exceed background and screening guidelines, recommendations will be made to take steps that eliminate transporting the contaminants indoors (e.g,. reduce contaminant track in by removing or changing shoes prior to entering residence, use higher efficiency filters on HVAC systems, keep windows closed). In addition, a public health implications statement will be provided for outdoor results.

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