WTC residential environmental sampling plan draft, Oct 2001

NYC 9/11 Public Portal Document

I Jeanine Prudhomme - wtc residential sampling plan.wpd Page?! wz.-z.w.-y.-.w.->zz.wz;

of mica-like material. In addition, the mica-like material has clogged roof drains and resulted in standing pools of water on residential roof tops. Finally, streets are periodically swept (HEPA vacuum trucks) and wetted (water trucks). However, the resident and others have reported constantly swirling dust throughout the area.

IL Sampling Objective:

The overall objective of this sampling is to provide results that will begin to characterize the ambient and indoor airborne and potentially airborne particles (surface dust) that remain in residential areas of lower Manhattan from the collapse of the World Trade Center that will allow a public health interpretation of the data.

Specific Objectives, in order of priority are: 1. Characterize the make-up and size distribution of both settled and airborne breathing zone dust in residential areas-both indoors and outside-closest to the WTC. This information will be used to determine if materials are present at levels of public health concern; the best methods for cleaning/removing the materials; and the best methods to prevent/minimize future material track-in into residential areas.

2. Characterize the make-up and size distribution of both settled and airborne breathing zone dust in other residential areas-both indoors and outside-located further from the WTC, but still impacted by debris and dust from the collapse. For example, modeling the debris/dust impact areas may indicate residential areas more than ten blocks away were affected, as debris and dust from the collapse were forced along street arteries [EPA’s ERT is attempting to determine if this modeling is possible]. Impact areas further from the site of collapse may have dust/debris with a different composition than what settled closer to the WTC. This information will be used to determine if materials are present at levels of public health concern; the best methods for cleaning/removing the materials; and the best methods to prevent future material track-in into residential areas.

3. Re-characterize a selected number of areas throughout the WTC cleanup to ensure that removal operations are not impacting area residents, cleaning methods remain effective, and exterior material track-in is not occurring.

in. Data and Quality Assurance:

IV. Sampling Parameters:

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