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EPA interim final report on WTC background study, April 2003

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Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.

NYC-WTC_000145869–000146029

Folder label: “INTERIM FINAL April 2003

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NYC 9/11 Public Portal Document

Table 7-2. Summary of Settled Asbestos Surface Dust Loadings Determined Through Microvacuum Sampling and Indirect Analysis by Transmission Electron Microscopy

Building Number of Number of Surface Loading of Asbestos Structures Category Buildings Samples (s/cm^) Range Geometric Mean Outside buildings 5 79 <400 to 140,000 5100 in a large city Inside buildings 6 28 <240 to 210,000 1000 with no surfacing ACM Areas of 12 34 <3500 to 74 million 160,000 buildings with acoustical plaster

Source: Ewing (2000).

ACM = asbestos-containing material

NYC-WTC_000145951

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NYC-WTC_000145951Source: NYC Law Department, mirrored locally

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