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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 7-1. Summary of U.S. Residential Building Average Indoor Airborne Asbestos Concentrations for Asbestos Fibers > 5 pm Long by Direct Transmission Electron Microscopy

Site Description Number Asbestos Fibers 5 pm Long Reference of (free) Samples Range Mean

15 San Francisco 30 ND ND CPSC 1987 residences (houses) with ACM 15 Cleveland residences 30 ND - 0.002 0.00023 CPSC 1987 (houses) with ACM 15 Philadelphia 29 ND - 0.001 0.00007 CPSC 1987 residences Rouses) with ACM 10 residential building 10 0.00000 Lee et al. 1992 1 San Francisco area 2 0.00213 Van Orden et al. residential building 1995 sampled following the 1989 Loma Prieta earthquake

Source: Adapted from HEI (1991), ATSDR (2001), Van Orden et al. (1995)

ACM = asbestos-containing material; ND = non-detect

NYC-WTC_000145950

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NYC-WTC_000145950Source: NYC Law Department, mirrored locally

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