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Document / 6 pages

Benchmarks - indoor contaminants of concern, Apr 2002

Machine-extracted title · confidence 80%

Strawman benchmarks for probable indoor contaminants of concern related to WTC assessment.

NYC-WTC_000163606–000163611

Folder label: “E-mails 2002 M. Gilsenan

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Scanned page image, NYC-WTC_000163609
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NYC 9/11 Public Portal Document

+ 1 I I > 40 ug/ft2 or 1,200 ppm | aggressive cleaning I 1 1 (professional?) - if 1 I I readings persist take I I I additional action to reduce 1 1 1 exposure 1 + +-------------------------- 1 II I 400 - 1,200 ppm 1 maintain recommended (i.e., | 1 I diligent wet/HEPA) cleaning | I 1 methods - consider I I I additional monitoring +-------------------- I III I <40 ug/ft or 400 ppm 1 no further action I +-------------------- I

Lead (indoor air)

----- + + Tier I Screening Value I Action + I I >1.5 ug/m3 (NAAQS) aggressive cleaning | 1 (professional?) - if | 1 readings persist take | I additional action to reduce 1 I exposure | '+ I II I background - 1.5 ug/m3 I maintain recommended (i.e., I I I diligent wet/HEPA) cleaning I I I methods - consider I I 1 additional monitoring 1 .+------------------------- I III I < background 1 no further action ■+-------------------------------------------------------- I

3

NYC-WTC_000163609

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NYC-WTC_000163609Source: NYC Law Department, mirrored locally

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