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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. Asbestos

Tier Action Asbestos (Settled Dust) Asbestos (indoor air) Level Basis Level Basis I Aggressive > 30,000 Millette’s K >0.028 fZcc 0.028 f/cc cleaning. If levels fZcm^ factor to estimate (PCME*) represents a 1x10“^ persist, take airborne levels for risk estimate for a additional action to different activities 1 year exposure reduce exposure. (see narrative below). Evaluate conditions in the area, including representativeness of air samples, asbestos settled dust levels, and loading. n Maintain 30,000 0.028 fi'cc 0.0009 ^cc recommended f/cm^ to 0.0009 f/cc represents a 1x10"* cleaning methods. background (or risk estimate for a Consider background) 30 year exposure additional monitoring.

Evaluate conditions in the area including representativeness of air samples, fibrous glass settled dust levels and loading. in No further action Backgroimd Level is set at that 0<BBS 9f7cc Level is set at that required. found in (PCME*) found in background, or (or background, or unaffected, areas, background) unaffected, areas. so that no increase In this way, no in risk due to the increase in risk due asbestos fibers to the asbestos would be fibers would be expected. expected. * PCME - fibers greater than 5 micrometers long (aspect ratio >3:1). Analysis by TEM.

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