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NYC-WTC_000223537

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NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan January 1, 2002 Air Sampling for Dioxins Page 3 P.S. 234 /Manhattan) ATC Project No. 1549125-0279

The indoor dioxin concentration range was 0.0013 to 0.0035 pg/m^ (0.0000013 to 0.0000035 ng/m^). The outdoor concentration range was 0.0014 to 0.0022 pg/m’ (0.0000014 to 0.0000022 ng/m^). All concentrations were below the EPA screening level of 0.16 ng/m^.

ATG appreciates the opportunity to provide this indoor air quality service to the BOE. Please call me at (212) 353-8280 extension 212 if you have any questions.

Sincerely,, ATC Associates, Inc.

James R. Cohn, CIH, CSP Regional Manager, Industrial Hygiene Division

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NYC-WTC_000223539

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NYC-WTC_000223539Source: NYC Law Department, mirrored locally

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ATC Associates report on dioxin wipe samples collected at P.S. 89M on December 20, 2001.

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